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worktree: refactor find_linked_symref function

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Refactoring will help transition this code to provide additional useful
worktree functions.

Signed-off-by: Michael Rappazzo <rappazzo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Rappazzo 2015-10-08 13:01:02 -04:00 committed by Junio C Hamano
parent ac6c561b59
commit 1ceb7f9067
1 changed files with 69 additions and 27 deletions
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96
worktree.c
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@ -3,6 +3,64 @@
#include "strbuf.h"
#include "worktree.h"
/*
* read 'path_to_ref' into 'ref'. Also if is_detached is not NULL,
* set is_detached to 1 (0) if the ref is detatched (is not detached).
*
* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
* for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
* git_path). Parse the ref ourselves.
*
* return -1 if the ref is not a proper ref, 0 otherwise (success)
*/
static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
{
if (is_detached)
*is_detached = 0;
if (!strbuf_readlink(ref, path_to_ref, 0)) {
/* HEAD is symbolic link */
if (!starts_with(ref->buf, "refs/") ||
check_refname_format(ref->buf, 0))
return -1;
} else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
/* textual symref or detached */
if (!starts_with(ref->buf, "ref:")) {
if (is_detached)
*is_detached = 1;
} else {
strbuf_remove(ref, 0, strlen("ref:"));
strbuf_trim(ref);
if (check_refname_format(ref->buf, 0))
return -1;
}
} else
return -1;
return 0;
}
static char *find_main_symref(const char *symref, const char *branch)
{
struct strbuf sb = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
struct strbuf gitdir = STRBUF_INIT;
char *existing = NULL;
strbuf_addf(&path, "%s/%s", get_git_common_dir(), symref);
if (parse_ref(path.buf, &sb, NULL) < 0)
goto done;
if (strcmp(sb.buf, branch))
goto done;
strbuf_addstr(&gitdir, get_git_common_dir());
strbuf_strip_suffix(&gitdir, ".git");
existing = strbuf_detach(&gitdir, NULL);
done:
strbuf_release(&path);
strbuf_release(&sb);
strbuf_release(&gitdir);
return existing;
}
static char *find_linked_symref(const char *symref, const char *branch,
const char *id)
{
@ -11,36 +69,20 @@ static char *find_linked_symref(const char *symref, const char *branch,
struct strbuf gitdir = STRBUF_INIT;
char *existing = NULL;
/*
* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside
* $GIT_DIR so resolve_ref_unsafe() won't work (it uses
* git_path). Parse the ref ourselves.
*/
if (id)
strbuf_addf(&path, "%s/worktrees/%s/%s", get_git_common_dir(), id, symref);
else
strbuf_addf(&path, "%s/%s", get_git_common_dir(), symref);
if (!id)
die("Missing linked worktree name");
if (!strbuf_readlink(&sb, path.buf, 0)) {
if (!starts_with(sb.buf, "refs/") ||
check_refname_format(sb.buf, 0))
goto done;
} else if (strbuf_read_file(&sb, path.buf, 0) >= 0 &&
starts_with(sb.buf, "ref:")) {
strbuf_remove(&sb, 0, strlen("ref:"));
strbuf_trim(&sb);
} else
strbuf_addf(&path, "%s/worktrees/%s/%s", get_git_common_dir(), id, symref);
if (parse_ref(path.buf, &sb, NULL) < 0)
goto done;
if (strcmp(sb.buf, branch))
goto done;
if (id) {
strbuf_reset(&path);
strbuf_addf(&path, "%s/worktrees/%s/gitdir", get_git_common_dir(), id);
if (strbuf_read_file(&gitdir, path.buf, 0) <= 0)
goto done;
strbuf_rtrim(&gitdir);
} else
strbuf_addstr(&gitdir, get_git_common_dir());
strbuf_reset(&path);
strbuf_addf(&path, "%s/worktrees/%s/gitdir", get_git_common_dir(), id);
if (strbuf_read_file(&gitdir, path.buf, 0) <= 0)
goto done;
strbuf_rtrim(&gitdir);
strbuf_strip_suffix(&gitdir, ".git");
existing = strbuf_detach(&gitdir, NULL);
@ -59,7 +101,7 @@ char *find_shared_symref(const char *symref, const char *target)
struct dirent *d;
char *existing;
if ((existing = find_linked_symref(symref, target, NULL)))
if ((existing = find_main_symref(symref, target)))
return existing;
strbuf_addf(&path, "%s/worktrees", get_git_common_dir());