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bisect: improve error msg of 'bisect reset' when original HEAD is deleted

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'git bisect reset' (without the optional <commit> argument) returns to
the original HEAD from where the bisection was started.  However,
when, for whatever reason, the user deleted the original HEAD before
invoking 'git bisect reset', then all he gets is an error message from
'git checkout':

  fatal: invalid reference: somebranch

Let's try to be more helpful with an error message better describing
what went wrong and a suggestion about how to resolve the situation:

  Could not check out original HEAD 'somebranch'. Try 'git bisect reset <commit>'.

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
SZEDER Gábor 2010-10-10 23:48:57 +02:00 committed by Junio C Hamano
parent 412ff738ad
commit 3bb8cf8824
1 changed files with 6 additions and 1 deletions
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7
git-bisect.sh
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@ -316,7 +316,12 @@ bisect_reset() {
*)
usage ;;
esac
git checkout "$branch" -- && bisect_clean_state
if git checkout "$branch" -- ; then
bisect_clean_state
else
die "Could not check out original HEAD '$branch'." \
"Try 'git bisect reset <commit>'."
fi
}
bisect_clean_state() {