setup: compute gitrev from outside of chroot

Together with previous commit, `xbps-src` is able to support
git-worktree and shared repository by now.

common/environment/setup/git.sh

@@ -18,3 +18,15 @@ elif [ -z "${SOURCE_DATE_EPOCH}" ]; then
 		export SOURCE_DATE_EPOCH="$($XBPS_GIT_CMD -C ${XBPS_DISTDIR} log --pretty='%ct' -n1 HEAD)"
 	fi
 fi
+
+# if XBPS_USE_GIT_REVS is enabled in conf file,
+# compute XBPS_GIT_REVS to use in pkg hooks
+if [ -z "$XBPS_USE_GIT_REVS" ]; then
+	unset XBPS_GIT_REVS
+elif [ -z "$XBPS_GIT_REVS" ]; then
+	if [ -n "$IN_CHROOT" ]; then
+		msg_error "xbps-src's BUG: XBPS_GIT_REVS is undefined\n"
+	else
+		export XBPS_GIT_REVS="$($XBPS_GIT_CMD -C "${XBPS_DISTDIR}" rev-parse --verify --short HEAD)"
+	fi
+fi

common/hooks/post-install/05-generate-gitrevs.sh

@@ -3,7 +3,6 @@
 
 hook() {
 	local GITREVS_FILE=${XBPS_STATEDIR}/gitrev
-	local rev
 
 	# If XBPS_USE_GIT_REVS is disabled in conf file don't continue.
 	if [ -z $XBPS_USE_GIT_REVS ]; then
@@ -14,12 +13,11 @@ hook() {
 		return
 	fi
 
-	if [ -z "$XBPS_GIT_CMD" ]; then
-		msg_error "BUG: post-install: XBPS_GIT_CMD is not set\n"
+	if [ -z "$XBPS_GIT_REVS" ]; then
+		msg_error "BUG: XBPS_GIT_REVS is not set\n"
 	fi
 
 	cd $XBPS_SRCPKGDIR
-	rev="$($XBPS_GIT_CMD rev-parse --short HEAD)"
-	echo "${sourcepkg}:${rev}"
-	echo "${sourcepkg}:${rev}" > $GITREVS_FILE
+	echo "${sourcepkg}:${XBPS_GIT_REVS}"
+	echo "${sourcepkg}:${XBPS_GIT_REVS}" > $GITREVS_FILE
 }

common/xbps-src/shutils/chroot.sh

@@ -175,6 +175,7 @@ chroot_handler() {
             ${HTTP_PROXY_AUTH:+HTTP_PROXY_AUTH="${HTTP_PROXY_AUTH}"} \
             ${FTP_RETRIES:+FTP_RETRIES="${FTP_RETRIES}"} \
             SOURCE_DATE_EPOCH="$SOURCE_DATE_EPOCH" \
+            XBPS_GIT_REVS="$XBPS_GIT_REVS" \
             XBPS_ALLOW_CHROOT_BREAKOUT="$XBPS_ALLOW_CHROOT_BREAKOUT" \
             $XBPS_COMMONDIR/chroot-style/${XBPS_CHROOT_CMD:=uunshare}.sh \
             $XBPS_MASTERDIR $XBPS_DISTDIR "$XBPS_HOSTDIR" "$XBPS_CHROOT_CMD_ARGS" \