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revparse: fix disambiguation of refs

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nulltoken 2012-07-06 21:25:42 +02:00
parent 805c81594d
commit e727938112
1 changed files with 98 additions and 84 deletions
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182
src/revparse.c
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@ -54,13 +54,15 @@ static int spec_looks_like_describe_output(const char *spec)
return retcode == 0;
}
static int revparse_lookup_object(git_object **out, git_repository *repo, const char *spec)
static int disambiguate_refname(git_reference **out, git_repository *repo, const char *refname)
{
size_t speclen = strlen(spec);
git_object *obj = NULL;
git_oid oid;
git_buf refnamebuf = GIT_BUF_INIT;
int error, i;
bool fallbackmode = true;
git_reference *ref;
git_buf refnamebuf = GIT_BUF_INIT, name = GIT_BUF_INIT;
static const char* formatters[] = {
"%s",
"refs/%s",
"refs/tags/%s",
"refs/heads/%s",
@ -68,7 +70,46 @@ static int revparse_lookup_object(git_object **out, git_repository *repo, const
"refs/remotes/%s/HEAD",
NULL
};
unsigned int i;
if (*refname)
git_buf_puts(&name, refname);
else {
git_buf_puts(&name, "HEAD");
fallbackmode = false;
}
for (i = 0; formatters[i] && (fallbackmode || i == 0); i++) {
git_buf_clear(&refnamebuf);
if ((error = git_buf_printf(&refnamebuf, formatters[i], git_buf_cstr(&name))) < 0)
goto cleanup;
error = git_reference_lookup_resolved(&ref, repo, git_buf_cstr(&refnamebuf), -1);
if (!error) {
*out = ref;
error = 0;
goto cleanup;
}
if (error != GIT_ENOTFOUND)
goto cleanup;
}
cleanup:
git_buf_free(&name);
git_buf_free(&refnamebuf);
return error;
}
static int revparse_lookup_object(git_object **out, git_repository *repo, const char *spec)
{
size_t speclen = strlen(spec);
git_object *obj = NULL;
git_oid oid;
int error;
git_reference *ref;
const char *substr;
/* "git describe" output; snip everything before/including "-g" */
@ -87,32 +128,20 @@ static int revparse_lookup_object(git_object **out, git_repository *repo, const
}
}
/* Fully-named ref */
if (!revparse_lookup_fully_qualifed_ref(&obj, repo, spec)) {
*out = obj;
return 0;
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;
}
/* Partially-named ref; match in this order: */
for (i=0; formatters[i]; i++) {
git_buf_clear(&refnamebuf);
if (git_buf_printf(&refnamebuf, formatters[i], spec) < 0) {
return GIT_ERROR;
}
if (!revparse_lookup_fully_qualifed_ref(&obj, repo, git_buf_cstr(&refnamebuf))) {
git_buf_free(&refnamebuf);
*out = obj;
return 0;
}
}
git_buf_free(&refnamebuf);
if (error < 0)
return error;
giterr_set(GITERR_REFERENCE, "Refspec '%s' not found.", spec);
return GIT_ENOTFOUND;
}
static int all_chars_are_digits(const char *str, size_t len)
{
size_t i = 0;
@ -123,30 +152,9 @@ static int all_chars_are_digits(const char *str, size_t len)
return 1;
}
static void normalize_maybe_empty_refname(git_buf *buf, git_repository *repo, const char *refspec, size_t refspeclen)
{
git_reference *ref;
if (!refspeclen) {
/* Empty refspec means current branch (target of HEAD) */
git_reference_lookup(&ref, repo, "HEAD");
git_buf_puts(buf, git_reference_target(ref));
git_reference_free(ref);
} else if (strstr(refspec, "HEAD")) {
/* Explicit head */
git_buf_puts(buf, refspec);
}else {
if (git__prefixcmp(refspec, "refs/heads/") != 0) {
git_buf_printf(buf, "refs/heads/%s", refspec);
} else {
git_buf_puts(buf, refspec);
}
}
}
static int walk_ref_history(git_object **out, git_repository *repo, const char *refspec, const char *reflogspec)
{
git_reference *ref;
git_reference *disambiguated = NULL;
git_reflog *reflog = NULL;
int n, retcode = GIT_ERROR;
int i, refloglen;
@ -170,8 +178,8 @@ static int walk_ref_history(git_object **out, git_repository *repo, const char *
if (git__strtol32(&n, reflogspec+3, NULL, 10) < 0 || n < 1)
return revspec_error(reflogspec);
if (!git_reference_lookup(&ref, repo, "HEAD")) {
if (!git_reflog_read(&reflog, ref)) {
if (!git_reference_lookup(&disambiguated, repo, "HEAD")) {
if (!git_reflog_read(&reflog, disambiguated)) {
regex_error = regcomp(&regex, "checkout: moving from (.*) to .*", REG_EXTENDED);
if (regex_error != 0) {
giterr_set_regex(&regex, regex_error);
@ -198,29 +206,40 @@ static int walk_ref_history(git_object **out, git_repository *repo, const char *
regfree(&regex);
}
}
git_reference_free(ref);
}
} else {
int date_error = 0;
int date_error = 0, result;
git_time_t timestamp;
git_buf datebuf = GIT_BUF_INIT;
result = disambiguate_refname(&disambiguated, repo, refspec);
if (result < 0) {
retcode = result;
goto cleanup;
}
git_buf_put(&datebuf, reflogspec+2, reflogspeclen-3);
date_error = git__date_parse(&timestamp, git_buf_cstr(&datebuf));
/* @{u} or @{upstream} -> upstream branch, for a tracking branch. This is stored in the config. */
if (!strcmp(reflogspec, "@{u}") || !strcmp(reflogspec, "@{upstream}")) {
if (!git__prefixcmp(git_reference_name(disambiguated), GIT_REFS_HEADS_DIR) &&
(!strcmp(reflogspec, "@{u}") || !strcmp(reflogspec, "@{upstream}"))) {
git_config *cfg;
if (!git_repository_config(&cfg, repo)) {
/* Is the ref a tracking branch? */
const char *remote;
git_buf_clear(&buf);
git_buf_printf(&buf, "branch.%s.remote", refspec);
git_buf_printf(&buf, "branch.%s.remote",
git_reference_name(disambiguated) + strlen(GIT_REFS_HEADS_DIR));
if (!git_config_get_string(&remote, cfg, git_buf_cstr(&buf))) {
/* Yes. Find the first merge target name. */
const char *mergetarget;
git_buf_clear(&buf);
git_buf_printf(&buf, "branch.%s.merge", refspec);
git_buf_printf(&buf, "branch.%s.merge",
git_reference_name(disambiguated) + strlen(GIT_REFS_HEADS_DIR));
if (!git_config_get_string(&mergetarget, cfg, git_buf_cstr(&buf)) &&
!git__prefixcmp(mergetarget, "refs/heads/")) {
/* Success. Look up the target and fetch the object. */
@ -237,12 +256,12 @@ static int walk_ref_history(git_object **out, git_repository *repo, const char *
else if (all_chars_are_digits(reflogspec+2, reflogspeclen-3) &&
!git__strtol32(&n, reflogspec+2, NULL, 10) &&
n <= 100000000) { /* Allow integer time */
normalize_maybe_empty_refname(&buf, repo, refspec, refspeclen);
if (n == 0) {
git_buf_puts(&buf, git_reference_name(disambiguated));
if (n == 0)
retcode = revparse_lookup_fully_qualifed_ref(out, repo, git_buf_cstr(&buf));
} else if (!git_reference_lookup(&ref, repo, git_buf_cstr(&buf))) {
if (!git_reflog_read(&reflog, ref)) {
else if (!git_reflog_read(&reflog, disambiguated)) {
int numentries = git_reflog_entrycount(reflog);
if (numentries < n) {
giterr_set(GITERR_REFERENCE, "Reflog for '%s' has only %d entries, asked for %d",
@ -253,48 +272,43 @@ static int walk_ref_history(git_object **out, git_repository *repo, const char *
const git_oid *oid = git_reflog_entry_oidold(entry);
retcode = git_object_lookup(out, repo, oid, GIT_OBJ_ANY);
}
}
git_reference_free(ref);
}
}
else if (!date_error) {
/* Ref as it was on a certain date */
normalize_maybe_empty_refname(&buf, repo, refspec, refspeclen);
git_reflog *reflog;
if (!git_reflog_read(&reflog, disambiguated)) {
/* Keep walking until we find an entry older than the given date */
int numentries = git_reflog_entrycount(reflog);
int i;
if (!git_reference_lookup(&ref, repo, git_buf_cstr(&buf))) {
git_reflog *reflog;
if (!git_reflog_read(&reflog, ref)) {
/* Keep walking until we find an entry older than the given date */
int numentries = git_reflog_entrycount(reflog);
int i;
for (i = numentries - 1; i >= 0; i--) {
const git_reflog_entry *entry = git_reflog_entry_byindex(reflog, i);
git_time commit_time = git_reflog_entry_committer(entry)->when;
if (commit_time.time - timestamp <= 0) {
retcode = git_object_lookup(out, repo, git_reflog_entry_oidnew(entry), GIT_OBJ_ANY);
break;
}
for (i = numentries - 1; i >= 0; i--) {
const git_reflog_entry *entry = git_reflog_entry_byindex(reflog, i);
git_time commit_time = git_reflog_entry_committer(entry)->when;
if (commit_time.time - timestamp <= 0) {
retcode = git_object_lookup(out, repo, git_reflog_entry_oidnew(entry), GIT_OBJ_ANY);
break;
}
if (i == -1) {
/* Didn't find a match */
retcode = GIT_ENOTFOUND;
}
git_reflog_free(reflog);
}
git_reference_free(ref);
if (i == -1) {
/* Didn't find a match */
retcode = GIT_ENOTFOUND;
}
git_reflog_free(reflog);
}
}
git_buf_free(&datebuf);
}
if (reflog) git_reflog_free(reflog);
cleanup:
if (reflog)
git_reflog_free(reflog);
git_buf_free(&buf);
git_reference_free(disambiguated);
return retcode;
}