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builtin/checkout: handle -B from detached HEAD correctly

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Ensure that strcmp() isn't called when head is null.

Previously we were getting segfaults when checkout -B was done from a
detached HEAD.

Signed-off-by: Tay Ray Chuan <rctay89@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Tay Ray Chuan
2010-08-10 00:52:26 +08:00
committed by Junio C Hamano
parent 02ac98374e
commit cc70148385
2 changed files with 7 additions and 1 deletions
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6
t/t2018-checkout-branch.sh
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@ -124,6 +124,12 @@ test_expect_success 'checkout -B to an existing branch resets branch to HEAD' '
do_checkout branch2 "" -B
'
test_expect_success 'checkout -B to an existing branch from detached HEAD resets branch to HEAD' '
git checkout $(git rev-parse --verify HEAD) &&
do_checkout branch2 "" -B
'
test_expect_success 'checkout -B to an existing branch with an explicit ref resets branch to that ref' '
git checkout branch1 &&