#!/bin/sh

# This hook script prevents the user from pushing to Savannah if any of the new
# commits' OpenPGP signatures cannot be verified.

# Called by "git push" after it has checked the remote status, but before
# anything has been pushed.  If this script exits with a non-zero status nothing
# will be pushed.
#
# This hook is called with the following parameters:
#
# $1 -- Name of the remote to which the push is being done
# $2 -- URL to which the push is being done
#
# If pushing without using a named remote those arguments will be equal.
#
# Information about the commits which are being pushed is supplied as lines to
# the standard input in the form:
#
#   <local ref> <local sha1> <remote ref> <remote sha1>

z40=0000000000000000000000000000000000000000

# Only use the hook when pushing to Savannah.
case "$2" in
*git.sv.gnu.org*)
	break
	;;
*)
	exit 0
	;;
esac

while read local_ref local_sha remote_ref remote_sha
do
	if [ "$local_sha" = $z40 ]
	then
		# Handle delete
		:
	else
		if [ "$remote_sha" = $z40 ]
		then
			# We are pushing a new branch. To prevent wasting too
			# much time for this relatively rare case, we examine
			# all commits since the first signed commit, rather than
			# the full history. This check *will* fail, and the user
			# will need to temporarily disable the hook to push the
			# new branch.
			range="e3d0fcbf7e55e8cbe8d0a1c5a24d73f341d7243b..$local_sha"
		else
			# Update to existing branch, examine new commits
			range="$remote_sha..$local_sha"
		fi

		# Verify the signatures of all commits being pushed.
		ret=0
		for commit in $(git rev-list $range)
		do
			if ! git verify-commit $commit >/dev/null 2>&1
			then
				printf "%s failed signature check\n" $commit
				ret=1
			fi
		done
		exit $ret
	fi
done

exit 0
 value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=23cbb464abbaf35463e41885ac5ea6fb7876845f'>root</a>/<a href='/guix/log/gnu?id=23cbb464abbaf35463e41885ac5ea6fb7876845f'>gnu</a>/<a href='/guix/log/gnu/build?id=23cbb464abbaf35463e41885ac5ea6fb7876845f'>build</a>/<a href='/guix/log/gnu/build/shepherd.scm?id=23cbb464abbaf35463e41885ac5ea6fb7876845f'>shepherd.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/build/shepherd.scm?id=23cbb464abbaf35463e41885ac5ea6fb7876845f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>