Today I Learned (TIL) - Personal Knowledge Base

Brief tips and tricks from various places.

Docker Tips/Shortcuts

Python Tips/Shortcuts

Tmux Tips/Shortcuts

Vim Tips/Shortcuts

VS Code Tips/Shortcuts

Git

Reset branch to remote (forcefully)

This example uses the main branch. Replace main with desired branch.

git fetch origin
git reset --hard origin/main
git clean -f

To see which files will be removed by clean without removing them, run:

git clean -n -f

Reference

Merge branch and remove from local and remote

After completing work on a branch, you can merge back to the main branch and remove it from both the local and remote. This example uses the working branch named working_branch.

git checkout main
git pull origin main
git merge working_branch
# Fix any merge conflicts, as necessary.
git push -u origin main
git branch -d working_branch                # Delete local branch
git push origin --delete working_branch     # Delete remote branch
git fetch --all --prune                     # Remove references to remote branch

Reference1 Reference2

Add tags to local and remote

Git tags are useful for maintaining check points of milestones in the development process. Typically, semantic versioning is recommended for tag numbers. To apply tags:

git checkout main                               # Ensure that you are on main branch.
git tag -a vX.Y.Z -m "Annotation for this tag." # Semantic verison tag for version X.Y.Z to local (on current branch).
git push --tags                                 # Apply tag to remote.
git ls-remote --tags                            # Display tags on remote.

Show commits for last X hours

The Git log command is one of the hidden gems of Git. To see all of the commits in the last X hours with the earliest first, run:

git log  --since="72 hours ago" --until="now" --reverse --pretty=format:"%h" | head -1

Reference

Stackstorm

Run ST2 actions, aliases, etc. via API in shell with auto-generated authentication token

The ST2 API is useful for prototyping and getting more detailed output than is possible when using the standard ST2 command-line tools. However, using the API requires an authentication token (or API key). You can create a simple shell script to auto-generate the token using your logged in ST2 account and set it to the ST2_AUTH_TOKEN environment variable.

ST2_AUTH_TOKEN=$(curl -X POST -k -u yourusername:'yourpassword' https://myhost.example.com/auth/v1/tokens | jq -r '."token"')

Now, to run an API command at the command line using this API token, just include the ST2_AUTH_TOKEN environment variable in the headers.

curl -H "X-Auth-Token: $ST2_AUTH_TOKEN" -k https://myhost.example.com/api/v1/actions

Read (and, optionally, decrypt) values from ST2 keystore in Jinja

To read (and, optionally, decrypt) values from the keystore using Jinja (versus YAQL) syntax in ST2, you can use a variety of possible syntax options:

{{ st2kv(PASSWORD_KEYS.keyname, decrypt=true) }}

api_user: "{{ st2kv.system.CUST___phillips66 |from_json_string |jsonpath_query('FORTIMANAGER.apiuser')|first }}"
api_pass: "{{ st2kv.system.phillips66___fmg_apipass| decrypt }}"

Reference1