From c1e29395fce81f4a1385ed5a820a2c7773ff8a14 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Fri, 21 Feb 2014 00:11:04 +0100
Subject: [PATCH 2/3] Use dedicated refs rather than branches for eclass data.

---
 eclass/git-r3.eclass | 30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/eclass/git-r3.eclass b/eclass/git-r3.eclass
index 487b77b..fb75cff 100644
--- a/eclass/git-r3.eclass
+++ b/eclass/git-r3.eclass
@@ -312,7 +312,7 @@ git-r3_fetch() {
 	local branch=${EGIT_BRANCH:+refs/heads/${EGIT_BRANCH}}
 	local remote_ref=${2:-${EGIT_COMMIT:-${branch:-HEAD}}}
 	local local_id=${3:-${CATEGORY}/${PN}/${SLOT%/*}}
-	local local_ref=refs/heads/${local_id}/__main__
+	local local_ref=refs/git-r3/${local_id}/__main__
 
 	[[ ${repos[@]} ]] || die "No URI provided and EGIT_REPO_URI unset"
 
@@ -324,17 +324,6 @@ git-r3_fetch() {
 	for r in "${repos[@]}"; do
 		einfo "Fetching ${remote_ref} from ${r} ..."
 
-		local lookup_ref
-		if [[ ${remote_ref} == refs/heads/* || ${remote_ref} == HEAD ]]
-		then
-			is_branch=1
-			lookup_ref=${remote_ref}
-		else
-			# ls-remote by commit is going to fail anyway,
-			# so we may as well pass refs/tags/ABCDEF...
-			lookup_ref=refs/tags/${remote_ref}
-		fi
-
 		local fetch_command=(
 			git fetch --prune "${r}"
 			# mirror the remote branches as local branches
@@ -346,11 +335,10 @@ git-r3_fetch() {
 		set -- "${fetch_command[@]}"
 		echo "${@}" >&2
 		if "${@}"; then
-			set -- git branch -f "${local_id}/__main__" \
-				"${ref[0]:-${remote_ref}}"
+			set -- git update-ref "${local_ref}" "${remote_ref}"
 			echo "${@}" >&2
 			if ! "${@}"; then
-				die "Creating branch for ${remote_ref} failed (wrong ref?)."
+				die "Referencing ${remote_ref} failed (wrong ref?)."
 			fi
 
 			success=1
@@ -429,7 +417,7 @@ git-r3_checkout() {
 
 	einfo "Checking out ${repos[0]} to ${out_dir} ..."
 
-	if ! git cat-file -e refs/heads/"${local_id}"/__main__
+	if ! git cat-file -e refs/git-r3/"${local_id}"/__main__
 	then
 		if [[ ${EVCS_OFFLINE} ]]; then
 			die "No local clone of ${repos[0]}. Unable to work with EVCS_OFFLINE."
@@ -448,7 +436,7 @@ git-r3_checkout() {
 	done
 	rm "${lockfile_l}" || die
 
-	set -- git checkout -f "${local_id}"/__main__ .
+	set -- git checkout -f refs/git-r3/"${local_id}"/__main__ .
 	echo "${@}" >&2
 	"${@}"
 	local ret=${?}
@@ -456,12 +444,12 @@ git-r3_checkout() {
 	# Remove the lock!
 	rm "${lockfile}" || die
 
-	[[ ${ret} == 0 ]] || die "git checkout ${local_id}/__main__ failed"
+	[[ ${ret} == 0 ]] || die "git checkout refs/git-r3/${local_id}/__main__ failed"
 
 	# diff against previous revision (if any)
-	local new_commit_id=$(git rev-parse --verify "${local_id}"/__main__)
+	local new_commit_id=$(git rev-parse --verify refs/git-r3/"${local_id}"/__main__)
 	local old_commit_id=$(
-		git rev-parse --verify "${local_id}"/__old__ 2>/dev/null
+		git rev-parse --verify refs/git-r3/"${local_id}"/__old__ 2>/dev/null
 	)
 
 	if [[ ! ${old_commit_id} ]]; then
@@ -482,7 +470,7 @@ git-r3_checkout() {
 			echo "   at the commit:            ${new_commit_id}"
 		fi
 	fi
-	git branch -f "${local_id}"/{__old__,__main__} || die
+	git update-ref refs/git-r3/"${local_id}"/{__old__,__main__} || die
 
 	# recursively checkout submodules
 	if [[ -f ${GIT_WORK_TREE}/.gitmodules ]]; then
-- 
1.9.0