static int retrieve_revobject_from_reflog(git_object **out, git_reference **base_ref, git_repository *repo, const char *identifier, unsigned int position)
{
git_reference *ref;
git_oid oid;
int error = -1;
if (*base_ref == NULL) {
if ((error = disambiguate_refname(&ref, repo, identifier)) < 0)
return error;
} else {
ref = *base_ref;
*base_ref = NULL;
}
if (position == 0) {
error = git_object_lookup(out, repo, git_reference_oid(ref), GIT_OBJ_ANY);
goto cleanup;
}
if ((error = retrieve_oid_from_reflog(&oid, ref, position)) < 0)
goto cleanup;
error = git_object_lookup(out, repo, &oid, GIT_OBJ_ANY);
cleanup:
git_reference_free(ref);
return error;
}
static int revparse_lookup_object(git_object **out, git_repository *repo, const char *spec)
{
int error;
git_reference *ref;
error = maybe_describe(out, repo, spec);
if (!error)
return 0;
if (error < 0 && error != GIT_ENOTFOUND)
return error;
error = disambiguate_refname(&ref, repo, spec);
if (!error) {
error = git_object_lookup(out, repo, git_reference_oid(ref), GIT_OBJ_ANY);
git_reference_free(ref);
return error;
}
if (error < 0 && error != GIT_ENOTFOUND)
return error;
error = maybe_sha_or_abbrev(out, repo, spec);
if (!error)
return 0;
if (error < 0 && error != GIT_ENOTFOUND)
return error;
giterr_set(GITERR_REFERENCE, "Refspec '%s' not found.", spec);
return GIT_ENOTFOUND;
}
static int retrieve_remote_tracking_reference(git_reference **base_ref, const char *identifier, git_repository *repo)
{
git_reference *tracking, *ref;
int error = -1;
if (*base_ref == NULL) {
if ((error = disambiguate_refname(&ref, repo, identifier)) < 0)
return error;
} else {
ref = *base_ref;
*base_ref = NULL;
}
if (!git_reference_is_branch(ref)) {
error = GIT_EINVALIDSPEC;
goto cleanup;
}
if ((error = git_branch_upstream(&tracking, ref)) < 0)
goto cleanup;
*base_ref = tracking;
cleanup:
git_reference_free(ref);
return error;
}
static int retrieve_previously_checked_out_branch_or_revision(git_object **out, git_reference **base_ref, git_repository *repo, const char *spec, const char *identifier, unsigned int position)
{
git_reference *ref = NULL;
git_reflog *reflog = NULL;
regex_t preg;
int numentries, i, cur, error = -1;
const git_reflog_entry *entry;
const char *msg;
regmatch_t regexmatches[2];
git_buf buf = GIT_BUF_INIT;
cur = position;
if (*identifier != '\0' || *base_ref != NULL)
return revspec_error(spec);
if (build_regex(&preg, "checkout: moving from (.*) to .*") < 0)
return -1;
if (git_reference_lookup(&ref, repo, GIT_HEAD_FILE) < 0)
goto cleanup;
if (git_reflog_read(&reflog, ref) < 0)
goto cleanup;
numentries = git_reflog_entrycount(reflog);
for (i = numentries - 1; i >= 0; i--) {
entry = git_reflog_entry_byindex(reflog, i);
msg = git_reflog_entry_msg(entry);
if (regexec(&preg, msg, 2, regexmatches, 0))
continue;
cur--;
if (cur > 0)
continue;
git_buf_put(&buf, msg+regexmatches[1].rm_so, regexmatches[1].rm_eo - regexmatches[1].rm_so);
if ((error = disambiguate_refname(base_ref, repo, git_buf_cstr(&buf))) == 0)
goto cleanup;
if (error < 0 && error != GIT_ENOTFOUND)
goto cleanup;
error = maybe_sha_or_abbrev(out, repo, git_buf_cstr(&buf));
goto cleanup;
}
error = GIT_ENOTFOUND;
cleanup:
git_reference_free(ref);
git_buf_free(&buf);
regfree(&preg);
git_reflog_free(reflog);
return error;
}
