## Friday, December 29, 2017

### Setting up Artifactory as Docker Registry

I was setting up artifactory as a docker registry on-premises with a self-signed certificate. This was not as simple as some of the docs suggested. It took me a bit to put together the process for this as it wasn’t really laid out in any single place. Here is what I did to get it working.

Distro: Ubuntu 16.04

I decided to do the subdomain method for setup. my FQDN that I will be subdomaining off of is artifactory.contoso.com. Each subdomain will be a different registry within artifactory. This will assume you already have an NGINX  instance setup to do the reverse proxy with the configuration defined by the Artifactory Reverse Proxy Generator.

Create self-signed certificate. I store mine in /mnt/data/ssl

$openssl req -newkey rsa:2048 -nodes –keyout /mnt/data/ssl/wildcard.artifactory.contoso.com.key -x509 -days 365 –out /mnt/data/ssl/wildcard.artifactory.contoso.com.cert Need to make this certificate available for docker # mkdir –p /etc/docker/certs.d/wildcard.artifactory.contoso.com;# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.key /etc/docker/certs.d/wildcard.artifactory.contoso.com/domain.key;# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.cert /etc/docker/certs.d/wildcard.artifactory.contoso.com/domain.cert;# ln –s /etc/docker/certs.d/wildcard.artifactory.contoso.com /etc/docker/certs.d/docker.artifactory.contoso.com; # ln –s /etc/docker/certs.d/wildcard.artifactory.contoso.com /etc/docker/certs.d/docker-local.artifactory.contoso.com; Now we have a folder setup for each subdomain for each docker registry in Artifactory. Next we need to add the certificates so the CA is known by the system. # cp /mnt/data/ssl/wildcard.artifactory.contoso.com.key /usr/local/share/ca-certificates/wildcard.artifactory.contoso.com.key;# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.cert /usr/local/share/ca-certificates/wildcard.artifactory.contoso.com.crt;# update-ca-certificates; Next we need to add the domains to the docker options to allow them to be insecure. # nano /etc/init.d/docker### EDIT ###DOCKER_OPTS="$DOCKER_OPTS --insecure-registry docker.artifactory.contoso.com  --insecure-registry docker-local.artifactory.contoso.com

Finally, we just need to restart docker.

# systemctl restart docker

YMMV, but these are the steps that I needed to do to get things working for me.

## Wednesday, December 13, 2017

### No Matching Cipher Found

Today I tried to pull latest from the develop branch in a git repository in TFS 2015. I use SSH for authentication to tfs git repositories, and when I ran the git pull command, I was presented with the following error:

no matching cipher found. their offer: aes256-cbc,aes192-cbc,aes128-cbc


There were some other lines about making sure the repository existed, and that I had permission, etc. But this line was the one that sort of stood out to me. It is not an error that I have come across before. It took me a little while to track down the issue, which is why I am writing this.

The error is not a TFS issue, nor is it a git issue. The error is coming from SSH. I think it started after I updated my version of openSSH on my mac to version 7.6p1.

To fix the issue, I opened up /etc/ssh/ssh_config and added the lines:

Match Host my-tfs-server.company-domain.com
Ciphers +aes128-cbc,aes192-cbc,aes256-cbc


You could make it less restrictive and omit Match Host line altogether, but I would rather add the exception for the specific servers that require it. After adding those lines, I was able to pull latest again.

## Sunday, November 26, 2017

### ROLLS HA43 PRO Monitor Post Mount

I have a ROLLS HA43 PRO 4 Channel Headphone amplifier and I have hated how it sits on my desk. It never stays where I want it, and is a pain to see what the volume is set to.

This weekend, I took some time in Autodesk Fusion 360 to design a tray to mount the HA43 to my monitor post. After a couple of test prints, and filament spool changes, it is finally printed.

If you have this amp, and a 2" (51mm) monitor post, you can download the files from Thingiverse.

## Friday, October 20, 2017

### PAGE FAULT IN UNPAGED AREA Windows 10 Insider Build 17017 GSOD/BSOD

After updating to Windows Insider 17017, I rebooted. Once I did, I got stuck in a GSOD/BSOD boot loop. See the loop in this video:

After some time looking around and such, I found that I needed to copy the volsnap.sys file from the Windows.old folder to the current Windows folder.

Here are the steps I took:

• Booted off the USB created above.
• Went into the Recovery tools for the system and opened the command console
• move c:\Windows\System32\drivers\volsnap.sys c:\Windows\System32\drivers\volsnap.bkp
• copy c:\Windows.old\Windows\System32\drivers\volsnap.sys c:\Windows\System32\drivers\volsnap.sys
• reboot

System then booted up with no problem.

## Saturday, September 23, 2017

### User Docker Agents with Jenkins

I am running Jenkins in my home lab in docker container. I wanted to also have different agents for the different types of projects I was building, like building some of my Arduino projects for the different boards I have, or nodejs packages, etc.

I have the Jenkins Cloud Plugin and docker-plugin installed. I was having some issues configuring it to connect to the docker api, and the plugin documentation is out dated.

Since this is my lab, I just set up for TCP communication vs the docker.sock. The documentation says to edit the /etc/init/docker.conf. Except on Ubuntu 16.04 that is not used.

Instead, you have to edit /lib/systemd/system/docker.service and add -H 0.0.0.0:32376 to ExecStart.

Run systemctl daemon-reload

And finally, systemctl restart docker

Now docker engine will restart and it will be listening on port 32376. If you do curl –XGET http://localhost:32376 you should get a response.

You can now configure jenkins to use tcp://<docker-host>:32376 and hit test connection.

## Thursday, August 10, 2017

### Diabetes Update

Back in January I talked about my Type 2 Diabetes diagnosis. It is now 7 months later, and I am proud to say that I have reversed my Type 2 Diabetes.

I am still using the Diabetes:M app that I discussed before, to track my daily calorie/carb intake.

I changed my diet, I did not just continue to eat as I did before and rely upon the insulin to correct my glucose. I started off by changing to a more of a restricted carb diet, this was the recommendation from the Dr. at the hospital. This consisted of eating fewer carbs, but not what I would consider a drastic change. It was a restriction of 75g of carbs per meal.

A few weeks in to January, I adjusted even more. I went to more of a Ketogenic style, or Atkins Modified, diet. Typically, I consume fewer than 40g of carbs per day, which is not as restrictive as either of these diets, but it is what I am currently following. When I started doing this diet, I didn't even know what a Ketogenic diet was. This was just a restriction that I put upon myself. My meals consist of high protein, high fat, low carb items. My go to is Potbelly's Farmhouse Salad (sans the tomatoes, because I don't like them) with the Potbelly Vinaigrette Dressing. This is about 560 calories, and 14g carbs. Or I will have the Jimmy John's #15 Tuna Unwich (again, no tomatoes). About 650 calories, and 9g carbs. But I also go to places like 5 Guys and get the Bacon Cheeseburger… The key is to axe the bread, and fries. I eat a lot fewer calories than I used to as well. On average, I consume 1,350 calories per day.

A lot of this change in my diet stemmed from an episode of The Joe Rogan Experience with guest Neil DeGrasse Tyson. In the episode, Neil said "If a physicist wrote a diet book it would be one line: Consume fewer calories than you burn". That sentence made complete sense to me. It is so simple. So that is what I did. Also in that episode, they talked about how Terry Crews does intermittent fasting. He only eats within an 8 hour window of the day. I also adapted that practice. I eat lunch at about 11:30am (or 12:00pm) and then I have dinner at about 6:30pm. I may have a snack of like a SlimJim type of food in between. But after 8:00pm I do not eat again, until lunch the next day.

Back in December, when I was admitted to the hospital, I weighed in at 347lbs. And this was after about a week or 2 of me not really eating because I was not feeling well. As of this morning, the day of writing this, I am 265.6lbs. That is 81.4lbs lost in 7 months, for those that are counting. Keep in mind, everything I described above is dietary changes. I have not added really any exercise to my day, except maybe a little bit of walking. The next phase of this will be to work in exercise to my daily routine.

This is just the beginning of my story. This is not the end. This is not something that I can say "Oh, I can eat what ever I want again, I am not a diabetic any more".

I never liked to share pictures of myself, because I was not happy with my appearance, while I am not satisfied to call it done, I will say that I am a lot happier with how I look, and feel. The picture on the left is back from October 2015 (It was the most recent photo I could find), the picture on the right is from the end of July 2017.

### Using Jenkins to rotate AWS Access Key for Jenkins User

At my work, we use Jenkins to handle the workloads for CI/CD to AWS. We have a credential stored in Jenkins that can assume a role to perform some tasks based on the application being built/deployed. This credential is an IAM user that uses an Access Key & Secret to authenticate and has only CLI access. We rotate the key for this account frequently.

Rotating the key helps keep a couple things in line:

1. We have a security policy that any IAM User that uses access keys has the keys rotated. This is also a best practice any how, with any password…
2. Since we rotate the key, we know that only the jenkins credential is what has the correct access key, so if someone manages to get the credential, and they are using it, even if their intention is sound, this will ensure that the 'rogue' service using it will not function after the key is rotated.

The other day was the day that the key had to be rotated, and I took on that task. We had no automation around this, so I manually updated the access key. And after I updated the new access key, In my spare time, I started to write some automation so this no longer has to be done manually in the future.

Here is the flow of the process that will happen during the key rotation:

• Jenkins will check the created date of the current access key
• If the date is older than the Expiration date
• The key will be set to inactive
• A new key will be generated
• The jenkins credential will be updated with this information
• The inactive key will be deleted
• If any of those steps fail, it will trigger the rollback, which will set the current key as active again, and the job will be marked as FAILED.

The first part of this process is the rotate.sh script (do not judge my bash script… I do not claim to be an expert)

#!/usr/bin/env bash

set -e;
function print_usage() {
(>&2 echo -e "Usage $0 -i -u \n"); (>&2 echo -e "-i:\tThe unique identifier for the jenkins credential"); (>&2 echo -e "-u:\tThe AWS IAM username to check the key for"); exit 1; } function process_key() { local kuser=$1;
local kdate=$(date -d$2 +%s);
local kkey=$3; local exp_date=$(date -d "now - 90 days" +%s);

if [ $kdate -le$exp_date ]; then
echo "Credential '$kkey' is expired and will be rotated."; # get new key local create_call=$(aws iam create-access-key --user-name "$kuser"); # this is for testing # local create_call=$(cat create.json);

local new_access_key=$(echo$create_call | jq -r '.AccessKey.AccessKeyId');
local new_secret_key=$(echo$create_call | jq -r '.AccessKey.SecretAccessKey');

# set old key inactive
aws iam update-access-key --access-key-id "$kkey" --status Inactive --user-name "$kuser";

export CI_ROTATE_CREDENTIAL_ID=$credential_id; export CI_ROTATE_OLD_ACCESS_KEY_ID=$kkey;
export CI_ROTATE_NEW_ACCESS_KEY_ID="$new_access_key"; export CI_ROTATE_NEW_SECRET_KEY="$new_secret_key";

echo "Update jenkins credential with the newly created AccessKey.";
groovy "./set-credential.groovy";
# this is for testing
# groovy "./dummy.groovy"

# delete old key since this was successful.
aws iam delete-access-key --access-key-id "$kkey" --user-name "$kuser";

export CI_ROTATE_NEW_SECRET_KEY="";
export CI_ROTATE_NEW_ACCESS_KEY_ID="";
export CI_ROTATE_OLD_ACCESS_KEY_ID="";
export CI_ROTATE_CREDENTIAL_ID="";
else
echo "Credential '$kkey' was not rotated because it is not expired."; fi } function roll_back() { kusername=$1;
kaccesskey=$2; if [ -z "${kusername}" ] || [ -z "${kaccesskey}" ]; then (>&2 echo "FATAL: Missing required values to rollback."); exit 1; fi ## Set the original key back to active aws iam update-access-key --access-key-id$kaccesskey --status Active --user-name $kusername; (>&2 echo "There was a failure and the access key ($kaccesskey) was set back to the Active state.");
# This will always exit 1 because if we come here we are in a failure state.
exit 1;
}

function run_rotate() {
while getopts "i:u:r:" arg; do
case $arg in i) local credential_id=$OPTARG;
;;
u)
local user_account=$OPTARG; ;; r) local rotate_region=$OPTARG;
;;
esac
done
shift $((OPTIND-1)) if [ -z "${user_account}" ] || [ -z "${credential_id}" ]; then print_usage; fi if ! command -v groovy > /dev/null 2>&1; then (>&2 echo "Unable to locate required groovy command. You must have groovy installed to run the key rotation script."); exit 1; if # https://aws.amazon.com/blogs/security/how-to-rotate-access-keys-for-iam-users/ local current_keys=$(aws iam list-access-keys --user-name "${user_account}" | jq -r '.AccessKeyMetadata[] | "$$.UserName),\(.CreateDate),\(.AccessKeyId)"'); # this is for testing # local current_keys=(cat keys.json | jq -r '.AccessKeyMetadata[] | "\(.UserName),\(.CreateDate),\(.AccessKeyId)"'); for key in current_keys; do # split by ',' and store IFS=, read xusername xcreatedate xaccesskey <<< key; process_key "xusername" "xcreatedate" "xaccesskey" || roll_back "xusername" "xaccesskey"; done echo "Jenkins / AWS Credential rotated for id:user ({credential_id}:{user_account}"; exit 0; } run_rotate @; One of the steps that happen within that script is a call to a groovy script. This groovy script handles the updating of the credential within Jenkins. #!/usr/bin/env groovy import com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl import jenkins.model.Jenkins def updateCredential = { id, old_access_key, new_access_key, new_secret_key -> println "Running updateCredential: (\"id\", \"old_access_key\", \"new_access_key\", \"************************\")" def creds = com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials( com.cloudbees.jenkins.plugins.awscredentials.BaseAmazonWebServicesCredentials.class, jenkins.model.Jenkins.instance ) def c = creds.findResult { it.id == id && it.accessKey == ? it : null } if ( c ) { println "found credential {c.id} for access_key {c.accessKey}" println c.class.toString() def credentials_store = jenkins.model.Jenkins.instance.getExtensionList( 'com.cloudbees.plugins.credentials.SystemCredentialsProvider' )[0].getStore() def tscope = c.scope as com.cloudbees.plugins.credentials.CredentialsScope def result = credentials_store.updateCredentials( com.cloudbees.plugins.credentials.domains.Domain.global(), c, new com.cloudbees.jenkins.plugins.awscredentials.AWSCredentialsImpl(tscope, c.id, new_access_key, new_secret_key, c.description, null, null) ) if (result) { println "password changed for id: {id}" } else { println "failed to change password for id: {id}" } } else { println "could not find credential for id: {id}" } } if ( env['CI_ROTATE_CREDENTIAL_ID'] == null || env['CI_ROTATE_NEW_ACCESS_KEY_ID'] == null || env['CI_ROTATE_NEW_SECRET_KEY'] == null || env['CI_ROTATE_OLD_ACCESS_KEY_ID'] == null || env['CI_ROTATE_CREDENTIAL_ID'] == '' || env['CI_ROTATE_NEW_ACCESS_KEY_ID'] == '' || env['CI_ROTATE_NEW_SECRET_KEY'] == '' || env['CI_ROTATE_OLD_ACCESS_KEY_ID'] == '' ) { println "Missing value for 'CI_ROTATE_CREDENTIAL_ID', 'CI_ROTATE_NEW_ACCESS_KEY_ID', or 'CI_ROTATE_NEW_SECRET_KEY'" println "CI_ROTATE_CREDENTIAL_ID: {env['CI_ROTATE_CREDENTIAL_ID']}" println "CI_ROTATE_OLD_ACCESS_KEY_ID: {env['CI_ROTATE_OLD_ACCESS_KEY_ID']}" println "CI_ROTATE_NEW_ACCESS_KEY_ID: {env['CI_ROTATE_NEW_ACCESS_KEY_ID']}" } else { updateCredential("{env['CI_ROTATE_CREDENTIAL_ID']}", "{env['CI_ROTATE_OLD_ACCESS_KEY_ID']}", "{env['CI_ROTATE_NEW_ACCESS_KEY_ID']}", "{env['CI_ROTATE_NEW_SECRET_KEY']}") } We used a Jenkinsfile to define the job that runs this, but I will leave that up to you… When the jenkins job runs, it will invoke the rotate.sh script like this: ./rotate.sh -i "7e8f7b9e-0331-4266-bbd7-a5640326a0b0" -u "jenkins-deployment" Now the access key for jenkins will always be in compliance, and we will know that only jenkins is using the key. This script assumes that the jenkins user has already assumed the role that is needed to perform the changes to the IAM user and that the credentials for that user are already set before it is called. Also, as of writing this, this script is not fully tested. This is the initial work I have done to perform this task. YMMV. ## Thursday, July 27, 2017 ### Configure NginX reverse proxy and OctoPrint I have a raspberry pi on my network that is an NginX reverse proxy so I can have SSL termination and friendly names for some services on my network. One of those services is OctoPrint for my PrusaI3 clone 3D printer. The host name for that raspberry pi is octopi01.bit13.local (bit13.local is my local domain) I want to be able to get to it in the browser by going to prusai3.bit13.local. I have configured my DNS, also running on the same raspberry pi, to have an alias for prusai3.bit13.local to point to the nginx host (dns01.bit13.local.). I then added an nginx config for the host so it will force SSL/TLS and proxy to the original host. server { # listen on port 80 listen 80; server_name prusai3.bit13.local; # send anyone that comes here on port 80 -> 443 return 301 https://prusai3.bit13.localrequest_uri; } server { # listen on 443 listen 443; server_name prusai3.bit13.local; # enable ssl ssl on; # this is just a self-signed cert ssl_certificate /etc/nginx/ssl/server.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { # DNS address resolver 192.168.2.1; # set some proxy headers proxy_set_header Host http_host; proxy_set_header X-Real-IP remote_addr; proxy_set_header X-Forwarded-For proxy_add_x_forwarded_for; # support WSS proxy_http_version 1.1; proxy_set_header Upgrade http_upgrade; proxy_set_header Connection "upgrade"; # pass on to the original host proxy_pass http://octopi01.bit13.local:80; } } Once I apply these changes, I can then access the OctoPrint website by visiting https://prusai3.bit13.local from my browser. ## Sunday, May 28, 2017 ### Access Windows Environment Variables from within Bash in WSL I have been using my MacBook a lot now that it is my main computer at work. So much so that I found it necessary to invert my scroll wheel on my mouse on my windows desktop to behave like my MacBook. I've also been using bash a lot more since I can have similar experience between the 2 machines. While in the process of writing the scripts to configure my bash environment on my Windows machine, I found the need to be able to access environment variables that are set in Windows. With WSL, the only environment variables that really come over to bash is PATH. I googled around for a bit, but didn't find any way to actually do this. Then I remembered that WSL has interop between Windows and WSL. This means that I can execute a Windows executable and redirect the output back to bash. Which means I should be able to execute powershell.exe to get the information I need. I first started with a test of just doing:  echo (powershell.exe -Command "gci ENV:") And that gave me what I wanted back. Now there are some differences in the paths between WSL and Windows, so I knew I would also have to adjust for that. What I did was put a file called ~/.env.ps1 in my home path. #!~/bin/powershell # Will return all the environment variables in KEY=VALUE format function Get-EnvironmentVariables { return (Get-ChildItem ENV: | foreach { "WIN_(Get-LinuxSafeValue -Value (_.Name -replace '\(|$$','').ToUpper())=$(Convert-ToWSLPath -Path $_.Value)" }) } # converts the C:\foo\bar path to the WSL counter part of /mnt/c/foo/bar function Convert-ToWSLPath { param ( [Parameter(Mandatory=$true)]
$Path ) (Get-LinuxSafeValue -Value (($Path -split ';' | foreach {
if ($_ -ne$null -and $_ -ne '' -and$_.Length -gt 0) {
(( (Fix-Path -Path $_) -replace '(^[A-Za-z])\:(.*)', '/mnt/$1$2') -replace '\\','/') } } ) -join ':')); } function Fix-Path { param ( [Parameter(Mandatory=$true)]
$Path ) if ($Path -match '^[A-Z]\:' ) {
return $Path.Substring(0,1).ToLower()+$Path.Substring(1);
} else {
return $Path } } # Ouputs a string of exports that can be evaluated function Import-EnvironmentVariables { return (Get-EnvironmentVariables | foreach { "export$_;" }) | Out-String
}

# Just escapes special characters
function Get-LinuxSafeValue {
param (
[Parameter(Mandatory=$true)]$Value
)
process {
return $Value -replace "(\s|'|"|\$|\#|&|!|~||\*|\?|$$|$$|\|)",'\$1'; } } Now in my .bashrc I have the following: #!/usr/bin/env bash source ~/.wsl_helper.bash eval$(winenv)

If I run env now, I get output like the following:

WIN_ONEDRIVE=/mnt/d/users/rconr/onedrive
PATH=~/bin:/foo:/usr/bin
WIN_PATH=/mnt/c/windows:/mnt/c/windows/system32

Notice the environment variables that are prefixed with WIN_? These are environment variables directly from Windows. I can now add additional steps to my .bashrc using these variables.

ln -s "$WIN_ONEDRIVE" ~/OneDrive Additionally, I added a script to my ~/bin folder that is in my path called powershell. This will allow me to make "native" style calls to powershell from within bash scripts. #!/usr/bin/env bash # rename to powershell # chmod +x powershell . ~/.wsl_helper.bash PS_WORKING_DIR=$(lxssdir)
if [ -f "$1" ] && "$1" ~= ".ps1$"; then powershell.exe -NoLogo -ExecutionPolicy ByPass -Command "Set-Location '${PS_WORKING_DIR}'; Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Get-Content $1)))${*:2}"
elif [ -f "$1" ] && "$1" ~!= "\.ps1$"; then powershell.exe -NoLogo -ExecutionPolicy ByPass -Command "Set-Location '${PS_WORKING_DIR}'; Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Get-Content $1)))${*:2}"
else
powershell.exe -NoLogo -ExecutionPolicy ByPass ${*:1} fi unset PS_WORKING_DIR In the powershell file, you will see a call to source a file called .wsl_helper.bash. This script has some helper functions that will do things like transform a path from a Windows style path to a linux WSL path, and do the opposite as well. #!/usr/bin/env bash # This is the translated path to where the LXSS root directory is export LXSS_ROOT=/mnt/c/Users/$USER/AppData/Local/lxss

# translate to linux path from windows path
function windir() {
echo "$1" | sed -e 's|^$$[a-z]$$:$$.*$$|/mnt/\L\1\E\2|' -e 's|\\|/|g' } # translate the path back to windows path function wsldir() { echo "$1" | sed -e 's|^/mnt/$$[a-z]$$/$$.*$$|\U\1\:\\\E\2|' -e 's|/|\\|g'
}

# gets the lxss path from windows
function lxssdir() {
if [ $# -eq 0 ]; then if echo "$PWD" | grep "^/mnt/[a-zA-Z]/" > /dev/null 2>&1; then
echo "$PWD"; else echo "$LXSS_ROOT$PWD"; fi else echo "$LXSS_ROOT$1"; fi } function printwinenv() { _winenv --get } # this will load the output exports of the windows envrionment variables function winenv() { _winenv --import } function _winenv() { if [$# -eq 0 ]; then
CMD_VERB="Get"
else
while test $# -gt 0; do case "$1" in
-g|--get)
CMD_VERB="Get"
shift
;;
-i|--import)
CMD_VERB="Import"
shift
;;
*)
CMD_VERB="Get"
break
;;
esac
done
fi
CMD_DIR=$(wsldir "$LXSS_ROOT$HOME/\.env.ps1") echo$(powershell.exe -Command "Import-Module -Name $CMD_DIR;$CMD_VERB-EnvironmentVariables") | sed -e 's|\r|\n|g' -e 's|^[\s\t]*||g';
}

## Wednesday, May 17, 2017

### Jenkins + NPM Install + Git

I have been working on setting up Jenkins Pipelines for some projects and had an issue that I think others have had, but I could not find a clear answer on the way to handle it.

We have some NPM Packages that are pulled from a private git repo, and all of the accounts have MFA enabled, including the CI user account. This means that SSH authentication is mandatory for CI user.

If there is only one host that you need to ssh auth with jenkins, or you use the exact same ssh key for all hosts, then you can just put the private key on your Jenkins server at ~/.ssh/id_rsa. If you need to specify a key dependant upon the host, which is the situation I was in, it was not working to pull the package.

The solution for this that I found was to use the ~/.ssh/config. In there you specify the hosts, the user, and what identity file to use. It can look something like this:

Host github.com
User git
IdentityFile ~/.ssh/github.key

Host bitbucket.org
User git
IdentityFile ~/.ssh/bitbucket.key

Host tfs.myonprem-domain.com
User my-ci-user
IdentityFile ~/.ssh/onprem-tfs.key


So now, when running npm install, ssh will know what identity file to use.

Bonus tip: Not everyone uses ssh, so in the package.json, it may not be configured to use ssh. You can put options in the global .gitconfig on the Jenkins server that will redirect the https protocol requests to ssh:

[url "ssh://git@github.com/"]
[url "ssh://git@bitbucket.org/"]
[url "ssh://tfs.myonprem-domain.com:22/"]


So with that, when git detects an https request, it will switch to use ssh.

## Tuesday, January 10, 2017

I won't go through all the details, but on December 26th, 2016, I was diagnosed with Type 2 Diabetes. As you probably expect, it means a drastic life-style change for me. I have to give insulin injections, and monitor blood glucose, as well as monitor the amount of carbohydrates that I consume. To help me track that information I found an application on Google Play called Diabetes:M (Play Store). The application is free, but ad supported. You can purchase the ad-free license for ~$9 or so, which I purchased as soon as I was sure it was the application that I wanted to use. This allows me to track everything that I need to be successful in controlling my diabetes. This includes information like my meals, my medications, blood pressure, insulin injections, etc. One of my favorite features of Diabetes:M is the ability for the application to sync the SQLite database, that contains all of the logged data, to a cloud storage provider like Dropbox. This, as a developer, got me thinking how I could leverage that so that I can provide my information to my wife so she is aware of what my current blood glucose level is. To start this project I created an Express node application and put a copy of the SQLite database in the directory structure of the application. I then went to work on creating some SQL queries to pull information from the Diabetes:M database. To start, I queried my most recent glucose level. One of the important steps to make the data current was for me to find a way to detect when a new version of the database was saved to my Dropbox. To do this, I found an application (for windows) called Directory Monitor. There is a free version of the application, which is what I am currently using, as the free version fits all my needs. I configured the application to run a shell script when the SQLite database file is modified on my system, which happens every time I log information in the Android application. The shell script goes and extracts the dbz file, which is just a gzipped (or some other compression) SQLite file. It takes that extracted database file and puts it in the /data directory in the express application. It then does a git commit and git push of the git repository. This commit triggers a deploy in Azure. Within seconds of me taking my glucose level, the database is updated on Azure, so when my wife wants to check to see how I am doing, she can see the data in near real-time. So when she opens the site on her phone she would see something like the following: She can even see a history of all the events that I have entered into Diabetes:M And, because I could, I added a dashboard with some charts This is just the beginning of what I have done. I have other things I want to add so my wife, and family, can support me in managing this so I can live a healthier life. Right now, the code for this is not publicly available because it is still very tied to my information and configuration. I will work towards getting this in a place that I can share the code so others can use this. Some other ideas that I think will be fun, and useful: • Alexa Skill – Wife will be able to ask Alexa what my glucose is, and will respond with something like "about 32 minutes ago, Ryan's glucose was 132" • iOS/Android 'support' app to be able to receive push notifications when there is a reason for concern, like high, or low glucose levels. • More detailed reports and the ability to change the timespan of the data. • Support for other systems to monitor the database changes. I have multiple Raspberry PI's that are always running, one of them could monitor the database for changes in Dropbox and the rPi could sync the database. • Nightscout (CGM in the Cloud) – Integration / Support for Nightscout and all the work that the community has already done here. ### Setting up Artifactory as Docker Registry I was setting up artifactory as a docker registry on-premises with a self-signed certificate. This was not as simple as some of the docs suggested. It took me a bit to put together the process for this as it wasn’t really laid out in any single place. Here is what I did to get it working. Distro: Ubuntu 16.04 I decided to do the subdomain method for setup. my FQDN that I will be subdomaining off of is artifactory.contoso.com. Each subdomain will be a different registry within artifactory. This will assume you already have an NGINX instance setup to do the reverse proxy with the configuration defined by the Artifactory Reverse Proxy Generator. Create self-signed certificate. I store mine in /mnt/data/ssl $ openssl req -newkey rsa:2048 -nodes –keyout /mnt/data/ssl/wildcard.artifactory.contoso.com.key -x509 -days 365 –out /mnt/data/ssl/wildcard.artifactory.contoso.com.cert

Need to make this certificate available for docker

# mkdir –p /etc/docker/certs.d/wildcard.artifactory.contoso.com;# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.key /etc/docker/certs.d/wildcard.artifactory.contoso.com/domain.key;# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.cert /etc/docker/certs.d/wildcard.artifactory.contoso.com/domain.cert;# ln –s /etc/docker/certs.d/wildcard.artifactory.contoso.com /etc/docker/certs.d/docker.artifactory.contoso.com; # ln –s /etc/docker/certs.d/wildcard.artifactory.contoso.com /etc/docker/certs.d/docker-local.artifactory.contoso.com;

Now we have a folder setup for each subdomain for each docker registry in Artifactory. Next we need to add the certificates so the CA is known by the system.

# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.key /usr/local/share/ca-certificates/wildcard.artifactory.contoso.com.key;# cp /mnt/data/ssl/wildcard.artifactory.contoso.com.cert /usr/local/share/ca-certificates/wildcard.artifactory.contoso.com.crt;# update-ca-certificates;

Next we need to add the domains to the docker options to allow them to be insecure.

# nano /etc/init.d/docker### EDIT ###DOCKER_OPTS="$DOCKER_OPTS --insecure-registry docker.artifactory.contoso.com --insecure-registry docker-local.artifactory.contoso.com Finally, we just need to restart docker. # systemctl restart docker YMMV, but these are the steps that I needed to do to get things working for me. ### No Matching Cipher Found Today I tried to pull latest from the develop branch in a git repository in TFS 2015. I use SSH for authentication to tfs git repositories, and when I ran the git pull command, I was presented with the following error: no matching cipher found. their offer: aes256-cbc,aes192-cbc,aes128-cbc  There were some other lines about making sure the repository existed, and that I had permission, etc. But this line was the one that sort of stood out to me. It is not an error that I have come across before. It took me a little while to track down the issue, which is why I am writing this. The error is not a TFS issue, nor is it a git issue. The error is coming from SSH. I think it started after I updated my version of openSSH on my mac to version 7.6p1. To fix the issue, I opened up /etc/ssh/ssh_config and added the lines: Match Host my-tfs-server.company-domain.com Ciphers +aes128-cbc,aes192-cbc,aes256-cbc  You could make it less restrictive and omit Match Host line altogether, but I would rather add the exception for the specific servers that require it. After adding those lines, I was able to pull latest again. ### ROLLS HA43 PRO Monitor Post Mount I have a ROLLS HA43 PRO 4 Channel Headphone amplifier and I have hated how it sits on my desk. It never stays where I want it, and is a pain to see what the volume is set to. This weekend, I took some time in Autodesk Fusion 360 to design a tray to mount the HA43 to my monitor post. After a couple of test prints, and filament spool changes, it is finally printed. If you have this amp, and a 2" (51mm) monitor post, you can download the files from Thingiverse. ### PAGE FAULT IN UNPAGED AREA Windows 10 Insider Build 17017 GSOD/BSOD After updating to Windows Insider 17017, I rebooted. Once I did, I got stuck in a GSOD/BSOD boot loop. See the loop in this video: After some time looking around and such, I found that I needed to copy the volsnap.sys file from the Windows.old folder to the current Windows folder. Here are the steps I took: • Downloaded the Windows Media Creation Tool. • Booted off the USB created above. • Went into the Recovery tools for the system and opened the command console • move c:\Windows\System32\drivers\volsnap.sys c:\Windows\System32\drivers\volsnap.bkp • copy c:\Windows.old\Windows\System32\drivers\volsnap.sys c:\Windows\System32\drivers\volsnap.sys • reboot System then booted up with no problem. ### User Docker Agents with Jenkins I am running Jenkins in my home lab in docker container. I wanted to also have different agents for the different types of projects I was building, like building some of my Arduino projects for the different boards I have, or nodejs packages, etc. I have the Jenkins Cloud Plugin and docker-plugin installed. I was having some issues configuring it to connect to the docker api, and the plugin documentation is out dated. Since this is my lab, I just set up for TCP communication vs the docker.sock. The documentation says to edit the /etc/init/docker.conf. Except on Ubuntu 16.04 that is not used. Instead, you have to edit /lib/systemd/system/docker.service and add -H 0.0.0.0:32376 to ExecStart. Run systemctl daemon-reload And finally, systemctl restart docker Now docker engine will restart and it will be listening on port 32376. If you do curl –XGET http://localhost:32376 you should get a response. You can now configure jenkins to use tcp://<docker-host>:32376 and hit test connection. ### Diabetes Update Back in January I talked about my Type 2 Diabetes diagnosis. It is now 7 months later, and I am proud to say that I have reversed my Type 2 Diabetes. I am still using the Diabetes:M app that I discussed before, to track my daily calorie/carb intake. I changed my diet, I did not just continue to eat as I did before and rely upon the insulin to correct my glucose. I started off by changing to a more of a restricted carb diet, this was the recommendation from the Dr. at the hospital. This consisted of eating fewer carbs, but not what I would consider a drastic change. It was a restriction of 75g of carbs per meal. A few weeks in to January, I adjusted even more. I went to more of a Ketogenic style, or Atkins Modified, diet. Typically, I consume fewer than 40g of carbs per day, which is not as restrictive as either of these diets, but it is what I am currently following. When I started doing this diet, I didn't even know what a Ketogenic diet was. This was just a restriction that I put upon myself. My meals consist of high protein, high fat, low carb items. My go to is Potbelly's Farmhouse Salad (sans the tomatoes, because I don't like them) with the Potbelly Vinaigrette Dressing. This is about 560 calories, and 14g carbs. Or I will have the Jimmy John's #15 Tuna Unwich (again, no tomatoes). About 650 calories, and 9g carbs. But I also go to places like 5 Guys and get the Bacon Cheeseburger… The key is to axe the bread, and fries. I eat a lot fewer calories than I used to as well. On average, I consume 1,350 calories per day. A lot of this change in my diet stemmed from an episode of The Joe Rogan Experience with guest Neil DeGrasse Tyson. In the episode, Neil said "If a physicist wrote a diet book it would be one line: Consume fewer calories than you burn". That sentence made complete sense to me. It is so simple. So that is what I did. Also in that episode, they talked about how Terry Crews does intermittent fasting. He only eats within an 8 hour window of the day. I also adapted that practice. I eat lunch at about 11:30am (or 12:00pm) and then I have dinner at about 6:30pm. I may have a snack of like a SlimJim type of food in between. But after 8:00pm I do not eat again, until lunch the next day. Back in December, when I was admitted to the hospital, I weighed in at 347lbs. And this was after about a week or 2 of me not really eating because I was not feeling well. As of this morning, the day of writing this, I am 265.6lbs. That is 81.4lbs lost in 7 months, for those that are counting. Keep in mind, everything I described above is dietary changes. I have not added really any exercise to my day, except maybe a little bit of walking. The next phase of this will be to work in exercise to my daily routine. This is just the beginning of my story. This is not the end. This is not something that I can say "Oh, I can eat what ever I want again, I am not a diabetic any more". I never liked to share pictures of myself, because I was not happy with my appearance, while I am not satisfied to call it done, I will say that I am a lot happier with how I look, and feel. The picture on the left is back from October 2015 (It was the most recent photo I could find), the picture on the right is from the end of July 2017. ### Using Jenkins to rotate AWS Access Key for Jenkins User At my work, we use Jenkins to handle the workloads for CI/CD to AWS. We have a credential stored in Jenkins that can assume a role to perform some tasks based on the application being built/deployed. This credential is an IAM user that uses an Access Key & Secret to authenticate and has only CLI access. We rotate the key for this account frequently. Rotating the key helps keep a couple things in line: 1. We have a security policy that any IAM User that uses access keys has the keys rotated. This is also a best practice any how, with any password… 2. Since we rotate the key, we know that only the jenkins credential is what has the correct access key, so if someone manages to get the credential, and they are using it, even if their intention is sound, this will ensure that the 'rogue' service using it will not function after the key is rotated. The other day was the day that the key had to be rotated, and I took on that task. We had no automation around this, so I manually updated the access key. And after I updated the new access key, In my spare time, I started to write some automation so this no longer has to be done manually in the future. Here is the flow of the process that will happen during the key rotation: • Jenkins will check the created date of the current access key • If the date is older than the Expiration date • The key will be set to inactive • A new key will be generated • The jenkins credential will be updated with this information • The inactive key will be deleted • If any of those steps fail, it will trigger the rollback, which will set the current key as active again, and the job will be marked as FAILED. The first part of this process is the rotate.sh script (do not judge my bash script… I do not claim to be an expert) #!/usr/bin/env bash set -e; function print_usage() { (>&2 echo -e "Usage$0 -i  -u \n");
(>&2 echo -e "-i:\tThe unique identifier for the jenkins credential");
(>&2 echo -e "-u:\tThe AWS IAM username to check the key for");
exit 1;
}

function process_key() {
local kuser=$1; local kdate=$(date -d $2 +%s); local kkey=$3;
local exp_date=$(date -d "now - 90 days" +%s); if [$kdate -le $exp_date ]; then echo "Credential '$kkey' is expired and will be rotated.";
# get new key
local create_call=$(aws iam create-access-key --user-name "$kuser");
# this is for testing
# local create_call=$(cat create.json); local new_access_key=$(echo $create_call | jq -r '.AccessKey.AccessKeyId'); local new_secret_key=$(echo $create_call | jq -r '.AccessKey.SecretAccessKey'); # set old key inactive aws iam update-access-key --access-key-id "$kkey" --status Inactive --user-name "$kuser"; export CI_ROTATE_CREDENTIAL_ID=$credential_id;
export CI_ROTATE_OLD_ACCESS_KEY_ID=$kkey; export CI_ROTATE_NEW_ACCESS_KEY_ID="$new_access_key";
export CI_ROTATE_NEW_SECRET_KEY="$new_secret_key"; echo "Update jenkins credential with the newly created AccessKey."; groovy "./set-credential.groovy"; # this is for testing # groovy "./dummy.groovy" # delete old key since this was successful. aws iam delete-access-key --access-key-id "$kkey" --user-name "$kuser"; export CI_ROTATE_NEW_SECRET_KEY=""; export CI_ROTATE_NEW_ACCESS_KEY_ID=""; export CI_ROTATE_OLD_ACCESS_KEY_ID=""; export CI_ROTATE_CREDENTIAL_ID=""; else echo "Credential '$kkey' was not rotated because it is not expired.";
fi

}

function roll_back() {
kusername=$1; kaccesskey=$2;

if [ -z "${kusername}" ] || [ -z "${kaccesskey}" ]; then
(>&2 echo "FATAL: Missing required values to rollback.");
exit 1;
fi

## Set the original key back to active
aws iam update-access-key --access-key-id $kaccesskey --status Active --user-name$kusername;

(>&2 echo "There was a failure and the access key ($kaccesskey) was set back to the Active state."); # This will always exit 1 because if we come here we are in a failure state. exit 1; } function run_rotate() { while getopts "i:u:r:" arg; do case$arg in
i)
local credential_id=$OPTARG; ;; u) local user_account=$OPTARG;
;;
r)
local rotate_region=$OPTARG; ;; esac done shift$((OPTIND-1))

if [ -z "${user_account}" ] || [ -z "${credential_id}" ]; then
print_usage;
fi

if ! command -v groovy > /dev/null 2>&1; then
(>&2 echo "Unable to locate required groovy command. You must have groovy installed to run the key rotation script.");
exit 1;
if

# https://aws.amazon.com/blogs/security/how-to-rotate-access-keys-for-iam-users/
local current_keys=$(aws iam list-access-keys --user-name "${user_account}" | jq -r '.AccessKeyMetadata[] |  "$$.UserName),\(.CreateDate),\(.AccessKeyId)"'); # this is for testing # local current_keys=(cat keys.json | jq -r '.AccessKeyMetadata[] | "\(.UserName),\(.CreateDate),\(.AccessKeyId)"'); for key in current_keys; do # split by ',' and store IFS=, read xusername xcreatedate xaccesskey <<< key; process_key "xusername" "xcreatedate" "xaccesskey" || roll_back "xusername" "xaccesskey"; done echo "Jenkins / AWS Credential rotated for id:user ({credential_id}:{user_account}"; exit 0; } run_rotate @; One of the steps that happen within that script is a call to a groovy script. This groovy script handles the updating of the credential within Jenkins. #!/usr/bin/env groovy import com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl import jenkins.model.Jenkins def updateCredential = { id, old_access_key, new_access_key, new_secret_key -> println "Running updateCredential: (\"id\", \"old_access_key\", \"new_access_key\", \"************************\")" def creds = com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials( com.cloudbees.jenkins.plugins.awscredentials.BaseAmazonWebServicesCredentials.class, jenkins.model.Jenkins.instance ) def c = creds.findResult { it.id == id && it.accessKey == ? it : null } if ( c ) { println "found credential {c.id} for access_key {c.accessKey}" println c.class.toString() def credentials_store = jenkins.model.Jenkins.instance.getExtensionList( 'com.cloudbees.plugins.credentials.SystemCredentialsProvider' )[0].getStore() def tscope = c.scope as com.cloudbees.plugins.credentials.CredentialsScope def result = credentials_store.updateCredentials( com.cloudbees.plugins.credentials.domains.Domain.global(), c, new com.cloudbees.jenkins.plugins.awscredentials.AWSCredentialsImpl(tscope, c.id, new_access_key, new_secret_key, c.description, null, null) ) if (result) { println "password changed for id: {id}" } else { println "failed to change password for id: {id}" } } else { println "could not find credential for id: {id}" } } if ( env['CI_ROTATE_CREDENTIAL_ID'] == null || env['CI_ROTATE_NEW_ACCESS_KEY_ID'] == null || env['CI_ROTATE_NEW_SECRET_KEY'] == null || env['CI_ROTATE_OLD_ACCESS_KEY_ID'] == null || env['CI_ROTATE_CREDENTIAL_ID'] == '' || env['CI_ROTATE_NEW_ACCESS_KEY_ID'] == '' || env['CI_ROTATE_NEW_SECRET_KEY'] == '' || env['CI_ROTATE_OLD_ACCESS_KEY_ID'] == '' ) { println "Missing value for 'CI_ROTATE_CREDENTIAL_ID', 'CI_ROTATE_NEW_ACCESS_KEY_ID', or 'CI_ROTATE_NEW_SECRET_KEY'" println "CI_ROTATE_CREDENTIAL_ID: {env['CI_ROTATE_CREDENTIAL_ID']}" println "CI_ROTATE_OLD_ACCESS_KEY_ID: {env['CI_ROTATE_OLD_ACCESS_KEY_ID']}" println "CI_ROTATE_NEW_ACCESS_KEY_ID: {env['CI_ROTATE_NEW_ACCESS_KEY_ID']}" } else { updateCredential("{env['CI_ROTATE_CREDENTIAL_ID']}", "{env['CI_ROTATE_OLD_ACCESS_KEY_ID']}", "{env['CI_ROTATE_NEW_ACCESS_KEY_ID']}", "{env['CI_ROTATE_NEW_SECRET_KEY']}") } We used a Jenkinsfile to define the job that runs this, but I will leave that up to you… When the jenkins job runs, it will invoke the rotate.sh script like this: ./rotate.sh -i "7e8f7b9e-0331-4266-bbd7-a5640326a0b0" -u "jenkins-deployment" Now the access key for jenkins will always be in compliance, and we will know that only jenkins is using the key. This script assumes that the jenkins user has already assumed the role that is needed to perform the changes to the IAM user and that the credentials for that user are already set before it is called. Also, as of writing this, this script is not fully tested. This is the initial work I have done to perform this task. YMMV. ### Configure NginX reverse proxy and OctoPrint I have a raspberry pi on my network that is an NginX reverse proxy so I can have SSL termination and friendly names for some services on my network. One of those services is OctoPrint for my PrusaI3 clone 3D printer. The host name for that raspberry pi is octopi01.bit13.local (bit13.local is my local domain) I want to be able to get to it in the browser by going to prusai3.bit13.local. I have configured my DNS, also running on the same raspberry pi, to have an alias for prusai3.bit13.local to point to the nginx host (dns01.bit13.local.). I then added an nginx config for the host so it will force SSL/TLS and proxy to the original host. server { # listen on port 80 listen 80; server_name prusai3.bit13.local; # send anyone that comes here on port 80 -> 443 return 301 https://prusai3.bit13.localrequest_uri; } server { # listen on 443 listen 443; server_name prusai3.bit13.local; # enable ssl ssl on; # this is just a self-signed cert ssl_certificate /etc/nginx/ssl/server.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { # DNS address resolver 192.168.2.1; # set some proxy headers proxy_set_header Host http_host; proxy_set_header X-Real-IP remote_addr; proxy_set_header X-Forwarded-For proxy_add_x_forwarded_for; # support WSS proxy_http_version 1.1; proxy_set_header Upgrade http_upgrade; proxy_set_header Connection "upgrade"; # pass on to the original host proxy_pass http://octopi01.bit13.local:80; } } Once I apply these changes, I can then access the OctoPrint website by visiting https://prusai3.bit13.local from my browser. ### Access Windows Environment Variables from within Bash in WSL I have been using my MacBook a lot now that it is my main computer at work. So much so that I found it necessary to invert my scroll wheel on my mouse on my windows desktop to behave like my MacBook. I've also been using bash a lot more since I can have similar experience between the 2 machines. While in the process of writing the scripts to configure my bash environment on my Windows machine, I found the need to be able to access environment variables that are set in Windows. With WSL, the only environment variables that really come over to bash is PATH. I googled around for a bit, but didn't find any way to actually do this. Then I remembered that WSL has interop between Windows and WSL. This means that I can execute a Windows executable and redirect the output back to bash. Which means I should be able to execute powershell.exe to get the information I need. I first started with a test of just doing:  echo (powershell.exe -Command "gci ENV:") And that gave me what I wanted back. Now there are some differences in the paths between WSL and Windows, so I knew I would also have to adjust for that. What I did was put a file called ~/.env.ps1 in my home path. #!~/bin/powershell # Will return all the environment variables in KEY=VALUE format function Get-EnvironmentVariables { return (Get-ChildItem ENV: | foreach { "WIN_(Get-LinuxSafeValue -Value (_.Name -replace '\(|$$','').ToUpper())=$(Convert-ToWSLPath -Path$_.Value)" })
}

# converts the C:\foo\bar path to the WSL counter part of /mnt/c/foo/bar
function Convert-ToWSLPath {
param (
[Parameter(Mandatory=$true)]$Path
)
(Get-LinuxSafeValue -Value (($Path -split ';' | foreach { if ($_ -ne $null -and$_ -ne '' -and $_.Length -gt 0) { (( (Fix-Path -Path$_) -replace '(^[A-Za-z])\:(.*)', '/mnt/$1$2') -replace '\\','/')
}
} ) -join ':'));
}

function Fix-Path {
param (
[Parameter(Mandatory=$true)]$Path
)
if ( $Path -match '^[A-Z]\:' ) { return$Path.Substring(0,1).ToLower()+$Path.Substring(1); } else { return$Path
}
}

# Ouputs a string of exports that can be evaluated
function Import-EnvironmentVariables {
return (Get-EnvironmentVariables | foreach { "export $_;" }) | Out-String } # Just escapes special characters function Get-LinuxSafeValue { param ( [Parameter(Mandatory=$true)]
$Value ) process { return$Value -replace "(\s|'|"|\$|\#|&|!|~||\*|\?|$$|$$|\|)",'\$1';
}
}

Now in my .bashrc I have the following:

#!/usr/bin/env bash

source ~/.wsl_helper.bash
eval $(winenv) If I run env now, I get output like the following: WIN_ONEDRIVE=/mnt/d/users/rconr/onedrive PATH=~/bin:/foo:/usr/bin WIN_PATH=/mnt/c/windows:/mnt/c/windows/system32 Notice the environment variables that are prefixed with WIN_? These are environment variables directly from Windows. I can now add additional steps to my .bashrc using these variables. ln -s "$WIN_ONEDRIVE" ~/OneDrive

Additionally, I added a script to my ~/bin folder that is in my path called powershell. This will allow me to make "native" style calls to powershell from within bash scripts.
#!/usr/bin/env bash

# rename to powershell
# chmod +x powershell

. ~/.wsl_helper.bash

PS_WORKING_DIR=$(lxssdir) if [ -f "$1" ] && "$1" ~= ".ps1$"; then
powershell.exe  -NoLogo -ExecutionPolicy ByPass -Command "Set-Location '${PS_WORKING_DIR}'; Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Get-Content$1))) ${*:2}" elif [ -f "$1" ] && "$1" ~!= "\.ps1$"; then
powershell.exe -NoLogo -ExecutionPolicy ByPass -Command "Set-Location '${PS_WORKING_DIR}'; Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Get-Content$1))) ${*:2}" else powershell.exe -NoLogo -ExecutionPolicy ByPass${*:1}
fi
unset PS_WORKING_DIR

In the powershell file, you will see a call to source a file called .wsl_helper.bash. This script has some helper functions that will do things like transform a path from a Windows style path to a linux WSL path, and do the opposite as well.

#!/usr/bin/env bash
# This is the translated path to where the LXSS root directory is
export LXSS_ROOT=/mnt/c/Users/$USER/AppData/Local/lxss # translate to linux path from windows path function windir() { echo "$1" | sed -e 's|^$$[a-z]$$:$$.*$$|/mnt/\L\1\E\2|' -e 's|\\|/|g'
}

# translate the path back to windows path
function wsldir() {
echo "$1" | sed -e 's|^/mnt/$$[a-z]$$/$$.*$$|\U\1\:\\\E\2|' -e 's|/|\\|g' } # gets the lxss path from windows function lxssdir() { if [$# -eq 0 ]; then
if echo "$PWD" | grep "^/mnt/[a-zA-Z]/" > /dev/null 2>&1; then echo "$PWD";
else
echo "$LXSS_ROOT$PWD";
fi
else
echo "$LXSS_ROOT$1";
fi
}

function printwinenv() {
_winenv --get
}

# this will load the output exports of the windows envrionment variables
function winenv() {
_winenv --import
}

function _winenv() {
if [ $# -eq 0 ]; then CMD_VERB="Get" else while test$# -gt 0; do
case "$1" in -g|--get) CMD_VERB="Get" shift ;; -i|--import) CMD_VERB="Import" shift ;; *) CMD_VERB="Get" break ;; esac done fi CMD_DIR=$(wsldir "$LXSS_ROOT$HOME/\.env.ps1")
echo $(powershell.exe -Command "Import-Module -Name$CMD_DIR; $CMD_VERB-EnvironmentVariables") | sed -e 's|\r|\n|g' -e 's|^[\s\t]*||g'; } ### Jenkins + NPM Install + Git I have been working on setting up Jenkins Pipelines for some projects and had an issue that I think others have had, but I could not find a clear answer on the way to handle it. We have some NPM Packages that are pulled from a private git repo, and all of the accounts have MFA enabled, including the CI user account. This means that SSH authentication is mandatory for CI user. If there is only one host that you need to ssh auth with jenkins, or you use the exact same ssh key for all hosts, then you can just put the private key on your Jenkins server at ~/.ssh/id_rsa. If you need to specify a key dependant upon the host, which is the situation I was in, it was not working to pull the package. The solution for this that I found was to use the ~/.ssh/config. In there you specify the hosts, the user, and what identity file to use. It can look something like this: Host github.com User git IdentityFile ~/.ssh/github.key Host bitbucket.org User git IdentityFile ~/.ssh/bitbucket.key Host tfs.myonprem-domain.com User my-ci-user IdentityFile ~/.ssh/onprem-tfs.key  So now, when running npm install, ssh will know what identity file to use. Bonus tip: Not everyone uses ssh, so in the package.json, it may not be configured to use ssh. You can put options in the global .gitconfig on the Jenkins server that will redirect the https protocol requests to ssh: [url "ssh://git@github.com/"] insteadOf = "https://github.com/" [url "ssh://git@bitbucket.org/"] insteadOf = "https://bitbucket.org/" [url "ssh://tfs.myonprem-domain.com:22/"] instadOf = "https://tfs.myonprem-domain.com/  So with that, when git detects an https request, it will switch to use ssh. ### Type 2 Diabetes Diagnosis I won't go through all the details, but on December 26th, 2016, I was diagnosed with Type 2 Diabetes. As you probably expect, it means a drastic life-style change for me. I have to give insulin injections, and monitor blood glucose, as well as monitor the amount of carbohydrates that I consume. To help me track that information I found an application on Google Play called Diabetes:M (Play Store). The application is free, but ad supported. You can purchase the ad-free license for ~$9 or so, which I purchased as soon as I was sure it was the application that I wanted to use.

This allows me to track everything that I need to be successful in controlling my diabetes. This includes information like my meals, my medications, blood pressure, insulin injections, etc. One of my favorite features of Diabetes:M is the ability for the application to sync the SQLite database, that contains all of the logged data, to a cloud storage provider like Dropbox. This, as a developer, got me thinking how I could leverage that so that I can provide my information to my wife so she is aware of what my current blood glucose level is.

To start this project I created an Express node application and put a copy of the SQLite database in the directory structure of the application. I then went to work on creating some SQL queries to pull information from the Diabetes:M database. To start, I queried my most recent glucose level.

One of the important steps to make the data current was for me to find a way to detect when a new version of the database was saved to my Dropbox. To do this, I found an application (for windows) called Directory Monitor. There is a free version of the application, which is what I am currently using, as the free version fits all my needs. I configured the application to run a shell script when the SQLite database file is modified on my system, which happens every time I log information in the Android application.

The shell script goes and extracts the dbz file, which is just a gzipped (or some other compression) SQLite file. It takes that extracted database file and puts it in the /data directory in the express application. It then does a git commit and git push of the git repository. This commit triggers a deploy in Azure. Within seconds of me taking my glucose level, the database is updated on Azure, so when my wife wants to check to see how I am doing, she can see the data in near real-time.

So when she opens the site on her phone she would see something like the following:

She can even see a history of all the events that I have entered into Diabetes:M

And, because I could, I added a dashboard with some charts

This is just the beginning of what I have done. I have other things I want to add so my wife, and family, can support me in managing this so I can live a healthier life. Right now, the code for this is not publicly available because it is still very tied to my information and configuration. I will work towards getting this in a place that I can share the code so others can use this.

Some other ideas that I think will be fun, and useful:

• Alexa Skill – Wife will be able to ask Alexa what my glucose is, and will respond with something like "about 32 minutes ago, Ryan's glucose was 132"
• iOS/Android 'support' app to be able to receive push notifications when there is a reason for concern, like high, or low glucose levels.
• More detailed reports and the ability to change the timespan of the data.
• Support for other systems to monitor the database changes. I have multiple Raspberry PI's that are always running, one of them could monitor the database for changes in Dropbox and the rPi could sync the database.
• Nightscout (CGM in the Cloud) – Integration / Support for Nightscout and all the work that the community has already done here.