Run remote scripts through git and push the result back

gitsecute.sh

#!/bin/bash

: "
Executes what's on a script, put its stdout and stderr
in an output file, update the .script_checksum file and commits.

## Dependencies

Requires bash, sha256sum and git.

## Configuration

By default it looks in this file's directory, the script is taken from the `script`
file and output is put on `output` file.
Before running the script, it pulls from remote.
After running the script, if applies, it commit and push to the remote.

Env vars:
- RUN_DIR: defaults to this file's dir
- GIT_BRANCH: defaults to main
- GIT_REMOTE: defaults to origin

## Scheduling

Add to crontab:

*/10 * * * * /path/to/gitsecute/gitsecute.sh
"

unwrap_err() {
    if [ ! $? ]; then
        echo "command errored: !!"
        exit 1
    fi
}

gitorigin=${GIT_ORIGIN:-origin}
gitbranch=${GIT_BRANCH:-main}
repo_path=${RUN_DIR:-$(dirname $BASH_SOURCE)}

cd $repo_path ; unwrap_err
git checkout $gitbranch && git pull --rebase $gitorigin $gitbranch ; unwrap_err

checksum_path=.script_checksum
script_path=script
output_path=ouput
shouldrun="si"
currchecksum=$(sha256sum $script_path | cut -f1 -d" ")
unwrap_err

if [ -f "$checksum_path" ]; then
    lastchecksum=$(cat "$checksum_path")

    if [ $lastchecksum = $currchecksum ]; then
        shouldrun=""
    fi
fi

if [ -z $shouldrun ]; then
    exit 0
fi

bash $script_path 2>&1 > $output_path
echo $currchecksum > $checksum_path

git add $checksum_path $output_path
git commit -m "$(date)"
git push $gitorigin $gitbranch