X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topgit.git;a=blobdiff_plain;f=tg.sh;h=9d08d636af97b6b4f3ad574b7fa486cca119f7aa;hp=1f6d3da6aab7949716a71efc8201fa6b62331eed;hb=a5d696411da77aa7a0d4ddf6beaa90f375ded411;hpb=341a3713f5c399f97c5c68a74772b12bb3d2ca57

diff --git a/tg.sh b/tg.sh
index 1f6d3da..9d08d63 100644
--- a/tg.sh
+++ b/tg.sh
@@ -54,6 +54,8 @@ setup_hook()
 	else
 		hook_call="exec $hook_call"
 	fi
+	# Don't call hook if tg is not installed
+	hook_call="if which \"$tg\" > /dev/null; then $hook_call; fi"
 	# Insert call into the hook
 	{
 		echo "#!/bin/sh"
@@ -126,6 +128,13 @@ branch_annihilated()
 	test "$(git rev-parse "$mb^{tree}")" = "$(git rev-parse "$_name^{tree}")";
 }
 
+# is_sha1 REF
+# Whether REF is a SHA1 (compared to a symbolic name).
+is_sha1()
+{
+	[ "$(git rev-parse "$1")" = "$1" ]
+}
+
 # recurse_deps CMD NAME [BRANCHPATH...]
 # Recursively eval CMD on all dependencies of NAME.
 # CMD can refer to $_name for queried branch name,