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checkout: Don't crash when switching away from an invalid branch.

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When using alternates, it is possible for HEAD to end up pointing to
an invalid commit. git checkout should be able to recover from that
situation without crashing.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Alexandre Julliard 2008-11-08 13:03:59 +01:00 committed by Junio C Hamano
parent 7c181d627c
commit 323e00fd46
2 changed files with 22 additions and 4 deletions
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8
builtin-checkout.c
View file

@ -32,7 +32,7 @@ static int post_checkout_hook(struct commit *old, struct commit *new,
memset(&proc, 0, sizeof(proc));
argv[0] = name;
argv[1] = xstrdup(sha1_to_hex(old->object.sha1));
argv[1] = xstrdup(sha1_to_hex(old ? old->object.sha1 : null_sha1));
argv[2] = xstrdup(sha1_to_hex(new->object.sha1));
argv[3] = changed ? "1" : "0";
argv[4] = NULL;
@ -360,10 +360,10 @@ static void update_refs_for_switch(struct checkout_opts *opts,
strbuf_init(&msg, 0);
old_desc = old->name;
if (!old_desc)
if (!old_desc && old->commit)
old_desc = sha1_to_hex(old->commit->object.sha1);
strbuf_addf(&msg, "checkout: moving from %s to %s",
old_desc, new->name);
old_desc ? old_desc : "(invalid)", new->name);
if (new->path) {
create_symref("HEAD", new->path, msg.buf);
@ -419,7 +419,7 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
* a new commit, we want to mention the old commit once more
* to remind the user that it might be lost.
*/
if (!opts->quiet && !old.path && new->commit != old.commit)
if (!opts->quiet && !old.path && old.commit && new->commit != old.commit)
describe_detached_head("Previous HEAD position was", old.commit);
if (!old.commit) {

18
t/t2011-checkout-invalid-head.sh Executable file
View file

@ -0,0 +1,18 @@
#!/bin/sh
test_description='checkout switching away from an invalid branch'
. ./test-lib.sh
test_expect_success 'setup' '
echo hello >world &&
git add world &&
git commit -m initial
'
test_expect_success 'checkout master from invalid HEAD' '
echo 0000000000000000000000000000000000000000 >.git/HEAD &&
git checkout master --
'
test_done