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submodule.c: submodule_move_head works with broken submodules

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Early on in submodule_move_head just after the check if the submodule is
initialized, we need to check if the submodule is populated correctly.

If the submodule is initialized but doesn't look like it is populated,
this is a red flag and can indicate multiple sorts of failures:
(1) The submodule may be recorded at an object name, that is missing.
(2) The submodule '.git' file link may be broken and it is not pointing
    at a repository.

In both cases we want to complain to the user in the non-forced mode,
and in the forced mode ignoring the old state and just moving the
submodule into its new state with a fixed '.git' file link.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller
2017-04-18 14:37:24 -07:00
committed by Junio C Hamano
parent 823bab09c6
commit f2d48994dc
2 changed files with 44 additions and 7 deletions
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28
submodule.c
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@ -1332,10 +1332,24 @@ int submodule_move_head(const char *path,
int ret = 0;
struct child_process cp = CHILD_PROCESS_INIT;
const struct submodule *sub;
int *error_code_ptr, error_code;
if (!is_submodule_initialized(path))
return 0;
if (flags & SUBMODULE_MOVE_HEAD_FORCE)
/*
* Pass non NULL pointer to is_submodule_populated_gently
* to prevent die()-ing. We'll use connect_work_tree_and_git_dir
* to fixup the submodule in the force case later.
*/
error_code_ptr = &error_code;
else
error_code_ptr = NULL;
if (old && !is_submodule_populated_gently(path, error_code_ptr))
return 0;
sub = submodule_from_path(null_sha1, path);
if (!sub)
@ -1353,15 +1367,21 @@ int submodule_move_head(const char *path,
absorb_git_dir_into_superproject("", path,
ABSORB_GITDIR_RECURSE_SUBMODULES);
} else {
struct strbuf sb = STRBUF_INIT;
strbuf_addf(&sb, "%s/modules/%s",
char *gitdir = xstrfmt("%s/modules/%s",
get_git_common_dir(), sub->name);
connect_work_tree_and_git_dir(path, sb.buf);
strbuf_release(&sb);
connect_work_tree_and_git_dir(path, gitdir);
free(gitdir);
/* make sure the index is clean as well */
submodule_reset_index(path);
}
if (old && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
char *gitdir = xstrfmt("%s/modules/%s",
get_git_common_dir(), sub->name);
connect_work_tree_and_git_dir(path, gitdir);
free(gitdir);
}
}
prepare_submodule_repo_env_no_git_dir(&cp.env_array);