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refs.c
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "refs.h"
#include "hash.h"
#include "repository.h"
#include "fileops.h"
#include "filebuf.h"
#include "pack.h"
#include "reflog.h"
#include "refdb.h"
#include <git2/tag.h>
#include <git2/object.h>
#include <git2/oid.h>
#include <git2/branch.h>
#include <git2/refs.h>
#include <git2/refdb.h>
#include <git2/sys/refs.h>
#include <git2/signature.h>
#include <git2/commit.h>
bool git_reference__enable_symbolic_ref_target_validation = true;
#define DEFAULT_NESTING_LEVEL 5
#define MAX_NESTING_LEVEL 10
enum {
GIT_PACKREF_HAS_PEEL = 1,
GIT_PACKREF_WAS_LOOSE = 2
};
static git_reference *alloc_ref(const char *name)
{
git_reference *ref = NULL;
size_t namelen = strlen(name), reflen;
if (!GIT_ADD_SIZET_OVERFLOW(&reflen, sizeof(git_reference), namelen) &&
!GIT_ADD_SIZET_OVERFLOW(&reflen, reflen, 1) &&
(ref = git__calloc(1, reflen)) != NULL)
memcpy(ref->name, name, namelen + 1);
return ref;
}
git_reference *git_reference__alloc_symbolic(
const char *name, const char *target)
{
git_reference *ref;
assert(name && target);
ref = alloc_ref(name);
if (!ref)
return NULL;
ref->type = GIT_REF_SYMBOLIC;
if ((ref->target.symbolic = git__strdup(target)) == NULL) {
git__free(ref);
return NULL;
}
return ref;
}
git_reference *git_reference__alloc(
const char *name,
const git_oid *oid,
const git_oid *peel)
{
git_reference *ref;
assert(name && oid);
ref = alloc_ref(name);
if (!ref)
return NULL;
ref->type = GIT_REF_OID;
git_oid_cpy(&ref->target.oid, oid);
if (peel != NULL)
git_oid_cpy(&ref->peel, peel);
return ref;
}
git_reference *git_reference__set_name(
git_reference *ref, const char *name)
{
size_t namelen = strlen(name);
size_t reflen;
git_reference *rewrite = NULL;
if (!GIT_ADD_SIZET_OVERFLOW(&reflen, sizeof(git_reference), namelen) &&
!GIT_ADD_SIZET_OVERFLOW(&reflen, reflen, 1) &&
(rewrite = git__realloc(ref, reflen)) != NULL)
memcpy(rewrite->name, name, namelen + 1);
return rewrite;
}
int git_reference_dup(git_reference **dest, git_reference *source)
{
if (source->type == GIT_REF_SYMBOLIC)
*dest = git_reference__alloc_symbolic(source->name, source->target.symbolic);
else
*dest = git_reference__alloc(source->name, &source->target.oid, &source->peel);
GITERR_CHECK_ALLOC(*dest);
return 0;
}
void git_reference_free(git_reference *reference)
{
if (reference == NULL)
return;
if (reference->type == GIT_REF_SYMBOLIC)
git__free(reference->target.symbolic);
if (reference->db)
GIT_REFCOUNT_DEC(reference->db, git_refdb__free);
git__free(reference);
}
int git_reference_delete(git_reference *ref)
{
const git_oid *old_id = NULL;
const char *old_target = NULL;
if (ref->type == GIT_REF_OID)
old_id = &ref->target.oid;
else
old_target = ref->target.symbolic;
return git_refdb_delete(ref->db, ref->name, old_id, old_target);
}
int git_reference_remove(git_repository *repo, const char *name)
{
git_refdb *db;
int error;
if ((error = git_repository_refdb__weakptr(&db, repo)) < 0)
return error;
return git_refdb_delete(db, name, NULL, NULL);
}
int git_reference_lookup(git_reference **ref_out,
git_repository *repo, const char *name)
{
return git_reference_lookup_resolved(ref_out, repo, name, 0);
}
int git_reference_name_to_id(
git_oid *out, git_repository *repo, const char *name)
{
int error;
git_reference *ref;
if ((error = git_reference_lookup_resolved(&ref, repo, name, -1)) < 0)
return error;
git_oid_cpy(out, git_reference_target(ref));
git_reference_free(ref);
return 0;
}
static int reference_normalize_for_repo(
git_refname_t out,
git_repository *repo,
const char *name,
bool validate)
{
int precompose;
unsigned int flags = GIT_REF_FORMAT_ALLOW_ONELEVEL;
if (!git_repository__cvar(&precompose, repo, GIT_CVAR_PRECOMPOSE) &&
precompose)
flags |= GIT_REF_FORMAT__PRECOMPOSE_UNICODE;
if (!validate)
flags |= GIT_REF_FORMAT__VALIDATION_DISABLE;
return git_reference_normalize_name(out, GIT_REFNAME_MAX, name, flags);
}
int git_reference_lookup_resolved(
git_reference **ref_out,
git_repository *repo,
const char *name,
int max_nesting)
{
git_refname_t scan_name;
git_ref_t scan_type;
int error = 0, nesting;
git_reference *ref = NULL;
git_refdb *refdb;
assert(ref_out && repo && name);
*ref_out = NULL;
if (max_nesting > MAX_NESTING_LEVEL)
max_nesting = MAX_NESTING_LEVEL;
else if (max_nesting < 0)
max_nesting = DEFAULT_NESTING_LEVEL;
scan_type = GIT_REF_SYMBOLIC;
if ((error = reference_normalize_for_repo(scan_name, repo, name, true)) < 0)
return error;
if ((error = git_repository_refdb__weakptr(&refdb, repo)) < 0)
return error;
for (nesting = max_nesting;
nesting >= 0 && scan_type == GIT_REF_SYMBOLIC;
nesting--)
{
if (nesting != max_nesting) {
strncpy(scan_name, ref->target.symbolic, sizeof(scan_name));
git_reference_free(ref);
}
if ((error = git_refdb_lookup(&ref, refdb, scan_name)) < 0)
return error;
scan_type = ref->type;
}
if (scan_type != GIT_REF_OID && max_nesting != 0) {
giterr_set(GITERR_REFERENCE,
"cannot resolve reference (>%u levels deep)", max_nesting);
git_reference_free(ref);
return -1;
}
*ref_out = ref;
return 0;
}
int git_reference_dwim(git_reference **out, git_repository *repo, const char *refname)
{
int error = 0, i;
bool fallbackmode = true, foundvalid = false;
git_reference *ref;
git_buf refnamebuf = GIT_BUF_INIT, name = GIT_BUF_INIT;
static const char* formatters[] = {
"%s",
GIT_REFS_DIR "%s",
GIT_REFS_TAGS_DIR "%s",
GIT_REFS_HEADS_DIR "%s",
GIT_REFS_REMOTES_DIR "%s",
GIT_REFS_REMOTES_DIR "%s/" GIT_HEAD_FILE,
NULL
};
if (*refname)
git_buf_puts(&name, refname);
else {
git_buf_puts(&name, GIT_HEAD_FILE);
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;
if (!git_reference_is_valid_name(git_buf_cstr(&refnamebuf))) {
error = GIT_EINVALIDSPEC;
continue;
}
foundvalid = true;
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:
if (error && !foundvalid) {
/* never found a valid reference name */
giterr_set(GITERR_REFERENCE,
"could not use '%s' as valid reference name", git_buf_cstr(&name));
}
if (error == GIT_ENOTFOUND)
giterr_set(GITERR_REFERENCE, "no reference found for shorthand '%s'", refname);
git_buf_free(&name);
git_buf_free(&refnamebuf);
return error;
}
/**
* Getters
*/
git_ref_t git_reference_type(const git_reference *ref)
{
assert(ref);
return ref->type;
}
const char *git_reference_name(const git_reference *ref)
{
assert(ref);
return ref->name;
}
git_repository *git_reference_owner(const git_reference *ref)
{
assert(ref);
return ref->db->repo;
}
const git_oid *git_reference_target(const git_reference *ref)
{
assert(ref);
if (ref->type != GIT_REF_OID)
return NULL;
return &ref->target.oid;
}
const git_oid *git_reference_target_peel(const git_reference *ref)
{
assert(ref);
if (ref->type != GIT_REF_OID || git_oid_iszero(&ref->peel))
return NULL;
return &ref->peel;
}
const char *git_reference_symbolic_target(const git_reference *ref)
{
assert(ref);
if (ref->type != GIT_REF_SYMBOLIC)
return NULL;
return ref->target.symbolic;
}
static int reference__create(
git_reference **ref_out,
git_repository *repo,
const char *name,
const git_oid *oid,
const char *symbolic,
int force,
const git_signature *signature,
const char *log_message,
const git_oid *old_id,
const char *old_target)
{
git_refname_t normalized;
git_refdb *refdb;
git_reference *ref = NULL;
int error = 0;
assert(repo && name);
assert(symbolic || signature);
if (ref_out)
*ref_out = NULL;
error = reference_normalize_for_repo(normalized, repo, name, true);
if (error < 0)
return error;
error = git_repository_refdb__weakptr(&refdb, repo);
if (error < 0)
return error;
if (oid != NULL) {
assert(symbolic == NULL);
if (!git_object__is_valid(repo, oid, GIT_OBJ_ANY)) {
giterr_set(GITERR_REFERENCE,
"target OID for the reference doesn't exist on the repository");
return -1;
}
ref = git_reference__alloc(normalized, oid, NULL);
} else {
git_refname_t normalized_target;
error = reference_normalize_for_repo(normalized_target, repo,
symbolic, git_reference__enable_symbolic_ref_target_validation);
if (error < 0)
return error;
ref = git_reference__alloc_symbolic(normalized, normalized_target);
}
GITERR_CHECK_ALLOC(ref);
if ((error = git_refdb_write(refdb, ref, force, signature, log_message, old_id, old_target)) < 0) {
git_reference_free(ref);
return error;
}
if (ref_out == NULL)
git_reference_free(ref);
else
*ref_out = ref;
return 0;
}
int configured_ident(git_signature **out, const git_repository *repo)
{
if (repo->ident_name && repo->ident_email)
return git_signature_now(out, repo->ident_name, repo->ident_email);
/* if not configured let us fall-through to the next method */
return -1;
}
int git_reference__log_signature(git_signature **out, git_repository *repo)
{
int error;
git_signature *who;
if(((error = configured_ident(&who, repo)) < 0) &&
((error = git_signature_default(&who, repo)) < 0) &&
((error = git_signature_now(&who, "unknown", "unknown")) < 0))
return error;
*out = who;
return 0;
}
int git_reference_create_matching(
git_reference **ref_out,
git_repository *repo,
const char *name,
const git_oid *id,
int force,
const git_oid *old_id,
const char *log_message)
{
int error;
git_signature *who = NULL;
assert(id);
if ((error = git_reference__log_signature(&who, repo)) < 0)
return error;
error = reference__create(
ref_out, repo, name, id, NULL, force, who, log_message, old_id, NULL);
git_signature_free(who);
return error;
}
int git_reference_create(
git_reference **ref_out,
git_repository *repo,
const char *name,
const git_oid *id,
int force,
const char *log_message)
{
return git_reference_create_matching(ref_out, repo, name, id, force, NULL, log_message);
}
int git_reference_symbolic_create_matching(
git_reference **ref_out,
git_repository *repo,
const char *name,
const char *target,
int force,
const char *old_target,
const char *log_message)
{
int error;
git_signature *who = NULL;
assert(target);
if ((error = git_reference__log_signature(&who, repo)) < 0)
return error;
error = reference__create(
ref_out, repo, name, NULL, target, force, who, log_message, NULL, old_target);
git_signature_free(who);
return error;
}
int git_reference_symbolic_create(
git_reference **ref_out,
git_repository *repo,
const char *name,
const char *target,
int force,
const char *log_message)
{
return git_reference_symbolic_create_matching(ref_out, repo, name, target, force, NULL, log_message);
}
static int ensure_is_an_updatable_direct_reference(git_reference *ref)
{
if (ref->type == GIT_REF_OID)
return 0;
giterr_set(GITERR_REFERENCE, "cannot set OID on symbolic reference");
return -1;
}
int git_reference_set_target(
git_reference **out,
git_reference *ref,
const git_oid *id,
const char *log_message)
{
int error;
git_repository *repo;
assert(out && ref && id);
repo = ref->db->repo;
if ((error = ensure_is_an_updatable_direct_reference(ref)) < 0)
return error;
return git_reference_create_matching(out, repo, ref->name, id, 1, &ref->target.oid, log_message);
}
static int ensure_is_an_updatable_symbolic_reference(git_reference *ref)
{
if (ref->type == GIT_REF_SYMBOLIC)
return 0;
giterr_set(GITERR_REFERENCE, "cannot set symbolic target on a direct reference");
return -1;
}
int git_reference_symbolic_set_target(
git_reference **out,
git_reference *ref,
const char *target,
const char *log_message)
{
int error;
assert(out && ref && target);
if ((error = ensure_is_an_updatable_symbolic_reference(ref)) < 0)
return error;
return git_reference_symbolic_create_matching(
out, ref->db->repo, ref->name, target, 1, ref->target.symbolic, log_message);
}
static int reference__rename(git_reference **out, git_reference *ref, const char *new_name, int force,
const git_signature *signature, const char *message)
{
git_refname_t normalized;
bool should_head_be_updated = false;
int error = 0;
assert(ref && new_name && signature);
if ((error = reference_normalize_for_repo(
normalized, git_reference_owner(ref), new_name, true)) < 0)
return error;
/* Check if we have to update HEAD. */
if ((error = git_branch_is_head(ref)) < 0)
return error;
should_head_be_updated = (error > 0);
if ((error = git_refdb_rename(out, ref->db, ref->name, normalized, force, signature, message)) < 0)
return error;
/* Update HEAD it was pointing to the reference being renamed */
if (should_head_be_updated &&
(error = git_repository_set_head(ref->db->repo, normalized)) < 0) {
giterr_set(GITERR_REFERENCE, "failed to update HEAD after renaming reference");
return error;
}
return 0;
}
int git_reference_rename(
git_reference **out,
git_reference *ref,
const char *new_name,
int force,
const char *log_message)
{
git_signature *who;
int error;
if ((error = git_reference__log_signature(&who, ref->db->repo)) < 0)
return error;
error = reference__rename(out, ref, new_name, force, who, log_message);
git_signature_free(who);
return error;
}
int git_reference_resolve(git_reference **ref_out, const git_reference *ref)
{
switch (git_reference_type(ref)) {
case GIT_REF_OID:
return git_reference_lookup(ref_out, ref->db->repo, ref->name);
case GIT_REF_SYMBOLIC:
return git_reference_lookup_resolved(ref_out, ref->db->repo, ref->target.symbolic, -1);
default:
giterr_set(GITERR_REFERENCE, "invalid reference");
return -1;
}
}
int git_reference_foreach(
git_repository *repo,
git_reference_foreach_cb callback,
void *payload)
{
git_reference_iterator *iter;
git_reference *ref;
int error;
if ((error = git_reference_iterator_new(&iter, repo)) < 0)
return error;
while (!(error = git_reference_next(&ref, iter))) {
if ((error = callback(ref, payload)) != 0) {
giterr_set_after_callback(error);
break;
}
}
if (error == GIT_ITEROVER)
error = 0;
git_reference_iterator_free(iter);
return error;
}
int git_reference_foreach_name(
git_repository *repo,
git_reference_foreach_name_cb callback,
void *payload)
{
git_reference_iterator *iter;
const char *refname;
int error;
if ((error = git_reference_iterator_new(&iter, repo)) < 0)
return error;
while (!(error = git_reference_next_name(&refname, iter))) {
if ((error = callback(refname, payload)) != 0) {
giterr_set_after_callback(error);
break;
}
}
if (error == GIT_ITEROVER)
error = 0;
git_reference_iterator_free(iter);
return error;
}
int git_reference_foreach_glob(
git_repository *repo,
const char *glob,
git_reference_foreach_name_cb callback,
void *payload)
{
git_reference_iterator *iter;
const char *refname;
int error;
if ((error = git_reference_iterator_glob_new(&iter, repo, glob)) < 0)
return error;
while (!(error = git_reference_next_name(&refname, iter))) {
if ((error = callback(refname, payload)) != 0) {
giterr_set_after_callback(error);
break;
}
}
if (error == GIT_ITEROVER)
error = 0;
git_reference_iterator_free(iter);
return error;
}
int git_reference_iterator_new(git_reference_iterator **out, git_repository *repo)
{
git_refdb *refdb;
if (git_repository_refdb__weakptr(&refdb, repo) < 0)
return -1;
return git_refdb_iterator(out, refdb, NULL);
}
int git_reference_iterator_glob_new(
git_reference_iterator **out, git_repository *repo, const char *glob)
{
git_refdb *refdb;
if (git_repository_refdb__weakptr(&refdb, repo) < 0)
return -1;
return git_refdb_iterator(out, refdb, glob);
}
int git_reference_next(git_reference **out, git_reference_iterator *iter)
{
return git_refdb_iterator_next(out, iter);
}
int git_reference_next_name(const char **out, git_reference_iterator *iter)
{
return git_refdb_iterator_next_name(out, iter);
}
void git_reference_iterator_free(git_reference_iterator *iter)
{
if (iter == NULL)
return;
git_refdb_iterator_free(iter);
}
static int cb__reflist_add(const char *ref, void *data)
{
char *name = git__strdup(ref);
GITERR_CHECK_ALLOC(name);
return git_vector_insert((git_vector *)data, name);
}
int git_reference_list(
git_strarray *array,
git_repository *repo)
{
git_vector ref_list;
assert(array && repo);
array->strings = NULL;
array->count = 0;
if (git_vector_init(&ref_list, 8, NULL) < 0)
return -1;
if (git_reference_foreach_name(
repo, &cb__reflist_add, (void *)&ref_list) < 0) {
git_vector_free(&ref_list);
return -1;
}
array->strings = (char **)git_vector_detach(&array->count, NULL, &ref_list);
return 0;
}
static int is_valid_ref_char(char ch)
{
if ((unsigned) ch <= ' ')
return 0;
switch (ch) {
case '~':
case '^':
case ':':
case '\\':
case '?':
case '[':
case '*':
return 0;
default:
return 1;
}
}
static int ensure_segment_validity(const char *name)
{
const char *current = name;
char prev = '\0';
const int lock_len = (int)strlen(GIT_FILELOCK_EXTENSION);
int segment_len;
if (*current == '.')
return -1; /* Refname starts with "." */
for (current = name; ; current++) {
if (*current == '\0' || *current == '/')
break;
if (!is_valid_ref_char(*current))
return -1; /* Illegal character in refname */
if (prev == '.' && *current == '.')
return -1; /* Refname contains ".." */
if (prev == '@' && *current == '{')
return -1; /* Refname contains "@{" */
prev = *current;
}
segment_len = (int)(current - name);
/* A refname component can not end with ".lock" */
if (segment_len >= lock_len &&
!memcmp(current - lock_len, GIT_FILELOCK_EXTENSION, lock_len))
return -1;
return segment_len;
}
static bool is_all_caps_and_underscore(const char *name, size_t len)
{
size_t i;
char c;
assert(name && len > 0);
for (i = 0; i < len; i++)
{
c = name[i];
if ((c < 'A' || c > 'Z') && c != '_')
return false;
}
if (*name == '_' || name[len - 1] == '_')
return false;
return true;
}
/* Inspired from https://github.com/git/git/blob/f06d47e7e0d9db709ee204ed13a8a7486149f494/refs.c#L36-100 */
int git_reference__normalize_name(
git_buf *buf,
const char *name,
unsigned int flags)
{
const char *current;
int segment_len, segments_count = 0, error = GIT_EINVALIDSPEC;
unsigned int process_flags;
bool normalize = (buf != NULL);
bool validate = (flags & GIT_REF_FORMAT__VALIDATION_DISABLE) == 0;
#ifdef GIT_USE_ICONV
git_path_iconv_t ic = GIT_PATH_ICONV_INIT;
#endif
assert(name);
process_flags = flags;
current = (char *)name;
if (validate && *current == '/')
goto cleanup;
if (normalize)
git_buf_clear(buf);
#ifdef GIT_USE_ICONV
if ((flags & GIT_REF_FORMAT__PRECOMPOSE_UNICODE) != 0) {
size_t namelen = strlen(current);
if ((error = git_path_iconv_init_precompose(&ic)) < 0 ||
(error = git_path_iconv(&ic, ¤t, &namelen)) < 0)
goto cleanup;
error = GIT_EINVALIDSPEC;
}
#endif
if (!validate) {
git_buf_sets(buf, current);
error = git_buf_oom(buf) ? -1 : 0;
goto cleanup;
}
while (true) {
segment_len = ensure_segment_validity(current);
if (segment_len < 0) {
if ((process_flags & GIT_REF_FORMAT_REFSPEC_PATTERN) &&
current[0] == '*' &&
(current[1] == '\0' || current[1] == '/')) {
/* Accept one wildcard as a full refname component. */
process_flags &= ~GIT_REF_FORMAT_REFSPEC_PATTERN;
segment_len = 1;
} else
goto cleanup;
}
if (segment_len > 0) {
if (normalize) {
size_t cur_len = git_buf_len(buf);
git_buf_joinpath(buf, git_buf_cstr(buf), current);
git_buf_truncate(buf,
cur_len + segment_len + (segments_count ? 1 : 0));
if (git_buf_oom(buf)) {
error = -1;
goto cleanup;
}
}
segments_count++;
}
/* No empty segment is allowed when not normalizing */
if (segment_len == 0 && !normalize)
goto cleanup;
if (current[segment_len] == '\0')
break;
current += segment_len + 1;
}
/* A refname can not be empty */
if (segment_len == 0 && segments_count == 0)
goto cleanup;
/* A refname can not end with "." */
if (current[segment_len - 1] == '.')
goto cleanup;
/* A refname can not end with "/" */
if (current[segment_len - 1] == '/')
goto cleanup;
if ((segments_count == 1 ) && !(flags & GIT_REF_FORMAT_ALLOW_ONELEVEL))
goto cleanup;
if ((segments_count == 1 ) &&
!(flags & GIT_REF_FORMAT_REFSPEC_SHORTHAND) &&
!(is_all_caps_and_underscore(name, (size_t)segment_len) ||
((flags & GIT_REF_FORMAT_REFSPEC_PATTERN) && !strcmp("*", name))))
goto cleanup;
if ((segments_count > 1)
&& (is_all_caps_and_underscore(name, strchr(name, '/') - name)))
goto cleanup;
error = 0;
cleanup:
if (error == GIT_EINVALIDSPEC)
giterr_set(
GITERR_REFERENCE,
"the given reference name '%s' is not valid", name);
if (error && normalize)
git_buf_free(buf);
#ifdef GIT_USE_ICONV
git_path_iconv_clear(&ic);
#endif
return error;