#!/bin/bash

# 20220315 bkw: SBo pre-commit hook, wrapper for sbolint.

# Installation:

# Copy this to <gitdir>/.git/hooks, mode 0755 (or anyway, make it
# executable). Also get sbolint and install it somewhere on $PATH,
# like /usr/local/bin. sbolint comes from:

# https://slackware.uk/~urchlay/repos/sbostuff/plain/sbolint

# That's a wgettable URL. You can also clone the sbostuff
# repo from https://slackware.uk/~urchlay/repos/sbostuff if you want.

# Usage:

# Just do your usual "git commit". When you do, sbolint will run on
# the build you're updating. If it finds any issues, it will cause the
# commit to abort, so you can fix whatever's wrong and try the commit
# again.

# Since sbolint isn't perfect, you can skip the check for any commit
# by running e.g:

#  SBOLINT=no git commit <arguments>

# You can also run sbolint by itself, and read its documentation with
# "sbolint --docs".

set -e
exec 1>&2

# Check for staged source archives (.tar.gz, .tar.xz, .tar.bz2, .zip, etc.)
# Symlinks: auto-removed. Regular files: blocked (must not be committed).
source_pattern='\.\(tar\.gz\|tar\.xz\|tar\.bz2\|tar\.zst\|tgz\|zip\|7z\|rpm\|deb\)$'
source_blocked=""
while IFS= read -r f; do
	mode=$(git ls-files --stage -- "$f" | awk '{print $1}')
	if [ "$mode" = "120000" ]; then
		echo "Removing staged symlink to source archive: $f"
		git rm --cached -q -- "$f"
		rm -f "$f"
	else
		source_blocked="$source_blocked $f"
	fi
done < <(git diff --cached --name-only | grep -i "$source_pattern")
if [ -n "$source_blocked" ]; then
	echo "*** ERROR: source archives staged for commit:"
	for f in $source_blocked; do echo "***   $f"; done
	echo "*** Remove them with: git rm --cached -- $source_blocked"
	exit 1
fi

# There should normally only be one changed build per commit, but this
# rule may get broken when the repo's frozen pending a new Slackware
# release. So use a loop.

# The weird-looking "< <(command)" syntax is why this script must
# have a #!/bin/bash at the top: it won't work with #!/bin/sh, even if
# /bin/sh is a symlink to bash.

if [ "${SBOLINT:-yes}" = "yes" ]; then
	sbolintfailed=""
	if ! which sbolint &>/dev/null; then
		echo "WARNING: can't find sbolint in PATH, no linting will be done"
	else
		while read build; do
			# if there's no slack-desc or README, assume the build has been removed.
			# the directory still might exist after a "git rm -rf" because it
			# might contain untracked files (e.g. the source tarball).
			if [ -e "$build/slack-desc" -o -e "$build/README" ]; then
				sbolint "$build" || sbolintfailed=1
			fi
		done < <(git diff --cached --name-only | cut -d/ -f1,2 | sort -u)
	fi
	if [ -n "$sbolintfailed" ]; then
		echo "*** sbolint failed, fix the errors or set SBOLINT=no"
		echo "*** in the environment to commit anyway."
		exit 1
	fi
fi

exit 0