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worktree: teach "repair" to fix outgoing links to worktrees

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The .git/worktrees/<id>/gitdir file points at the location of a linked
worktree's .git file. Its content must be of the form
/path/to/worktree/.git (from which the location of the worktree itself
can be derived by stripping the "/.git" suffix). If the gitdir file is
deleted or becomes corrupted or outdated, then Git will be unable to
find the linked worktree. An easy way for the gitdir file to become
outdated is for the user to move the worktree manually (without using
"git worktree move"). Although it is possible to manually update the
gitdir file to reflect the new linked worktree location, doing so
requires a level of knowledge about worktree internals beyond what a
user should be expected to know offhand.

Therefore, teach "git worktree repair" how to repair broken or outdated
.git/worktrees/<id>/gitdir files automatically. (For this to work, the
command must either be invoked from within the worktree whose gitdir
file requires repair, or from within the main or any linked worktree by
providing the path of the broken worktree as an argument to "git
worktree repair".)

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine
2020-08-31 02:57:58 -04:00
committed by Junio C Hamano
parent bdd1f3e4da
commit b214ab5aa5
5 changed files with 188 additions and 5 deletions
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7
builtin/worktree.c
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@ -1043,15 +1043,18 @@ static void report_repair(int iserr, const char *path, const char *msg, void *cb
static int repair(int ac, const char **av, const char *prefix)
{
const char **p;
const char *self[] = { ".", NULL };
struct option options[] = {
OPT_END()
};
int rc = 0;
ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
if (ac)
usage_with_options(worktree_usage, options);
repair_worktrees(report_repair, &rc);
p = ac > 0 ? av : self;
for (; *p; p++)
repair_worktree_at_path(*p, report_repair, &rc);
return rc;
}