1 files changed, 113 insertions, 0 deletions
diff --git a/VREF/gpg b/VREF/gpg
new file mode 100755
index 0000000..07e1664
--- /dev/null
+++ b/VREF/gpg
@@ -0,0 +1,113 @@
+#!/bin/bash
+# based on gentoo-infra: infra/githooks.git:update-02-gpg
+
+# --- Command line
+refname=${1}
+oldrev=${2}
+newrev=${3}
+
+# --- Safety check
+if [ -z "${GIT_DIR}" ]; then
+	echo "Don't run this script from the command line." >&2
+	echo " (if you want, you could supply GIT_DIR then run" >&2
+	echo "  ${0} <ref> <oldrev> <newrev>)" >&2
+	exit 1
+fi
+
+if [ -z "${refname}" -o -z "${oldrev}" -o -z "${newrev}" ]; then
+	echo "usage: ${0} <ref> <oldrev> <newrev>" >&2
+	exit 1
+fi
+
+# branch names or 'all', or 'all-refs' for all refs
+SIGNED_BRANCHES=$(git config --get gpg.signed-branches)
+: ${SIGNED_BRANCHES:=master}
+VERIFY_SIGS=$(git config --get gpg.verify-signatures)
+: ${VERIFY_SIGS:=users}
+
+case ${VERIFY_SIGS} in
+	users)
+		;;
+	no)
+		;;
+	*)
+		echo "Invalid value of gpg.verify-signatures" >&2
+		exit 1
+esac
+
+case ${SIGNED_BRANCHES} in
+	all-refs)
+		;;
+	all)
+		[[ ${refname} == refs/heads/* ]] || exit 0
+		;;
+	*)
+		[[ ${refname} == refs/heads/* ]] || exit 0
+		branch_found=
+		for branch in ${SIGNED_BRANCHES}; do
+			if [[ ${refname#refs/heads/} == ${branch} ]]; then
+				branch_found=1
+				break
+			fi
+		done
+		[[ ${branch_found} == 1 ]] || exit 0
+esac
+
+IFS='
+'
+
+# special cases
+zeros=0000000000000000000000000000000000000000
+# branch removal
+[[ ${newrev} == "${zeros}" ]] && exit 0
+# new branch; try to find a merge base with master
+if [[ ${oldrev} == "${zeros}" && ${refname} != refs/heads/master ]]; then
+	mergebase=$(git merge-base refs/heads/master "${newrev}")
+	[[ -n ${mergebase} ]] && oldrev=${mergebase}
+fi
+rev_list_arg="${oldrev}..${newrev}"
+# new and no common commit?  gotta check them all
+[[ ${oldrev} == "${zeros}" ]] && rev_list_arg="${newrev}"
+
+while read -r r; do
+	committer=$(git show -q --pretty=format:'%ce' "${r}")
+	signst=$(git show -q --pretty=format:'%G?' "${r}")
+	case ${VERIFY_SIGS} in
+		users)
+			# user signatures must be Good
+			[[ ${signst} == G ]] && continue
+			;;
+		no)
+			# additionally skip untrusted/impossible to check
+			# when verification is disabled
+			[[ ${signst} == [GUE] ]] && continue
+			;;
+	esac
+
+	# error reporting
+	case ${signst} in
+		U)
+			echo "*** Untrusted signature on ${r}, refusing"
+			exit 1
+			;;
+		B)
+			echo "*** Bad signature on ${r}, refusing"
+			exit 1
+			;;
+		N)
+			echo "*** No signature on ${r}, refusing"
+			exit 1
+			;;
+		E)
+			echo "*** Signature cannot be checked on ${r}, refusing"
+			exit 1
+			;;
+		*)
+			echo "*** Unknown signature status '${signst}', refusing"
+			exit 1
+			;;
+	esac
+done < <(git rev-list --first-parent "${rev_list_arg}")
+
+# --- Finished
+exit 0