[PATCH 1/5] git-prompt: do not look for refs/stash in $GIT_DIR

[Jeff King <peff@peff.net>]

Since dd0b72c (bash prompt: use bash builtins to check stash
state, 2011-04-01), git-prompt checks whether we have a
stash by looking for $GIT_DIR/refs/stash. Generally external
programs should never do this, because they would miss
packed-refs.

That commit claims that packed-refs does not pack
refs/stash, but that is not quite true. It does pack the
ref, but due to a bug, fails to prune the ref. When we fix
that bug, we would want to be doing the right thing here.

Signed-off-by: Jeff King <peff@peff.net>
---
I know we are pretty sensitive to forks in the prompt code (after all,
that was the point of dd0b72c). This patch is essentially a reversion of
this hunk of dd0b72c, and is definitely safe.

I think we could probably get by with:

  [ -r "$g/logs/ref/stash" ]

since reflogs are always in the filesystem. However, that seems somewhat
short-sighted, as the work Ronnie is doing is moving in the direction of
more abstraction here. I hope a day will come soon when reflogs do not
have to be stored in $GIT_DIR/logs, and then we would end up updating
this code again.

 contrib/completion/git-prompt.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 9d684b1..c5473dc 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -468,7 +468,8 @@ __git_ps1 ()
 			fi
 		fi
 		if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ] &&
-		   [ -r "$g/refs/stash" ]; then
+		   git rev-parse --verify --quiet refs/stash >/dev/null
+		then
 			s="$"
 		fi
 
-- 
2.1.0.346.ga0367b9