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clone: factor out checking for an alternate path

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In a later patch we want to determine if a path is suitable as an
alternate from other commands than builtin/clone. Move the checking
functionality of `add_one_reference` to `compute_alternate_path` that is
defined in cache.h.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller
2016-08-15 14:53:24 -07:00
committed by Junio C Hamano
parent 5f50f33e87
commit 9eeea7d2bc
3 changed files with 86 additions and 34 deletions
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76
sha1_file.c
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@ -425,6 +425,82 @@ void add_to_alternates_file(const char *reference)
free(alts);
}
/*
* Compute the exact path an alternate is at and returns it. In case of
* error NULL is returned and the human readable error is added to `err`
* `path` may be relative and should point to $GITDIR.
* `err` must not be null.
*/
char *compute_alternate_path(const char *path, struct strbuf *err)
{
char *ref_git = NULL;
const char *repo, *ref_git_s;
int seen_error = 0;
ref_git_s = real_path_if_valid(path);
if (!ref_git_s) {
seen_error = 1;
strbuf_addf(err, _("path '%s' does not exist"), path);
goto out;
} else
/*
* Beware: read_gitfile(), real_path() and mkpath()
* return static buffer
*/
ref_git = xstrdup(ref_git_s);
repo = read_gitfile(ref_git);
if (!repo)
repo = read_gitfile(mkpath("%s/.git", ref_git));
if (repo) {
free(ref_git);
ref_git = xstrdup(repo);
}
if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
char *ref_git_git = mkpathdup("%s/.git", ref_git);
free(ref_git);
ref_git = ref_git_git;
} else if (!is_directory(mkpath("%s/objects", ref_git))) {
struct strbuf sb = STRBUF_INIT;
seen_error = 1;
if (get_common_dir(&sb, ref_git)) {
strbuf_addf(err,
_("reference repository '%s' as a linked "
"checkout is not supported yet."),
path);
goto out;
}
strbuf_addf(err, _("reference repository '%s' is not a "
"local repository."), path);
goto out;
}
if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
strbuf_addf(err, _("reference repository '%s' is shallow"),
path);
seen_error = 1;
goto out;
}
if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
strbuf_addf(err,
_("reference repository '%s' is grafted"),
path);
seen_error = 1;
goto out;
}
out:
if (seen_error) {
free(ref_git);
ref_git = NULL;
}
return ref_git;
}
int foreach_alt_odb(alt_odb_fn fn, void *cb)
{
struct alternate_object_database *ent;