Tahinli/forge

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1	#!/bin/sh
2	# Roll back ~/bin/forge to ~/bin/forge.prev after a unit failed.
3	# Usage: forge-rollback <unit-name>. Output goes to the journal.
4	set -eu
5
6	unit="${1:?usage: forge-rollback <unit-name>}"
7	bin="$HOME/bin/forge"
8	prev="$bin.prev"
9	bad="$bin.bad"
10
11	if [ ! -e "$prev" ]; then
12	echo "forge-rollback: $unit failed and $prev does not exist, nothing to roll back"
13	exit 0
14	fi
15
16	sha=$(sha256sum "$bin" \| cut -d' ' -f1)
17	# Keep one hash per line, even if the file was edited by hand without a final newline.
18	if [ -s "$bad" ] && [ -n "$(tail -c 1 "$bad")" ]; then
19	echo >> "$bad"
20	fi
21	echo "$sha" >> "$bad"
22	mv -f "$prev" "$bin"
23	echo "forge-rollback: $unit failed, marked $sha bad, restored $prev"
24
25	systemctl --user reset-failed "$unit"
26	systemctl --user start "$unit"
27	echo "forge-rollback: started $unit on the previous binary"