Til

The problem: Automations sometimes need to store the state of several entities at once and then restore all of them at a later point in time. An example of this is:

When I open my balcony door at night, I want the lights in my room to turn off. when I close the balcony door, I want the lights to be restored to the exact same state they were previously.

Sometimes you need to upgrade a server, but you also need to prevent apt from upgrading a specific package (eg. your node.js version). Many package-managers support this scenario under names like “version pinning” or “package holding”. This is how you prevent apt from upgrading a single package:

Dependencies

• Ubuntu 12.04 or newer
• apt

Pin a package to prevent it from being upgraded

sudo apt-mark hold $PACKAGE_NAME

Unpin a package to allow it being upgraded again

sudo apt-mark unhold $PACKAGE_NAME

Dependencies

• node.js and npm (obviously)
• jq
• xargs (may needs to be installed manually)

Update all dependencies to their latest version:

cat package.json | \
	jq -r '.dependencies | keys[]' | \
	xargs -I {} npm i -S {}@latest

Update all devDependencies to their latest version:

cat package.json | \
	jq -r '.devDependencies | keys[]' | \
	xargs -I {} npm i -S {}@latest

Alias the commands for easier reuse

To reuse the commands without having to remember them just put them into your .bashrc or .bash_profile file. Add this to the end of your bash configuration and restart your shell afterwards:

Today I learned how to count git commits in a repository by author name:

git shortlog -s -n --all --no-merges

Explanation:

• git shortlog: summarize git log output
• -s: only count commits
• -n: sort by commit number instead of author name
• --all: count commits in all branches
• --no-merges: exclude merge commits

If you want to include author emails add -e

Sources:

• https://git-scm.com/docs/git-shortlog
• https://git-scm.com/docs/git-log

Hey Blog! Long time no see…

Today I will show you how to download and execute caddy - an automatic https web server and reverse proxy written in Go!

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