Hash :
af5cd936
Author :
Date :
2017-10-13T13:12:10
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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 "tag.h"
#include "commit.h"
#include "signature.h"
#include "message.h"
#include "git2/object.h"
#include "git2/repository.h"
#include "git2/signature.h"
#include "git2/odb_backend.h"
void git_tag__free(void *_tag)
{
git_tag *tag = _tag;
git_signature_free(tag->tagger);
git__free(tag->message);
git__free(tag->tag_name);
git__free(tag);
}
int git_tag_target(git_object **target, const git_tag *t)
{
assert(t);
return git_object_lookup(target, t->object.repo, &t->target, t->type);
}
const git_oid *git_tag_target_id(const git_tag *t)
{
assert(t);
return &t->target;
}
git_otype git_tag_target_type(const git_tag *t)
{
assert(t);
return t->type;
}
const char *git_tag_name(const git_tag *t)
{
assert(t);
return t->tag_name;
}
const git_signature *git_tag_tagger(const git_tag *t)
{
return t->tagger;
}
const char *git_tag_message(const git_tag *t)
{
assert(t);
return t->message;
}
static int tag_error(const char *str)
{
giterr_set(GITERR_TAG, "failed to parse tag: %s", str);
return -1;
}
static int tag_parse(git_tag *tag, const char *buffer, const char *buffer_end)
{
static const char *tag_types[] = {
NULL, "commit\n", "tree\n", "blob\n", "tag\n"
};
unsigned int i;
size_t text_len, alloc_len;
char *search;
if (git_oid__parse(&tag->target, &buffer, buffer_end, "object ") < 0)
return tag_error("object field invalid");
if (buffer + 5 >= buffer_end)
return tag_error("object too short");
if (memcmp(buffer, "type ", 5) != 0)
return tag_error("type field not found");
buffer += 5;
tag->type = GIT_OBJ_BAD;
for (i = 1; i < ARRAY_SIZE(tag_types); ++i) {
size_t type_length = strlen(tag_types[i]);
if (buffer + type_length >= buffer_end)
return tag_error("object too short");
if (memcmp(buffer, tag_types[i], type_length) == 0) {
tag->type = i;
buffer += type_length;
break;
}
}
if (tag->type == GIT_OBJ_BAD)
return tag_error("invalid object type");
if (buffer + 4 >= buffer_end)
return tag_error("object too short");
if (memcmp(buffer, "tag ", 4) != 0)
return tag_error("tag field not found");
buffer += 4;
search = memchr(buffer, '\n', buffer_end - buffer);
if (search == NULL)
return tag_error("object too short");
text_len = search - buffer;
GITERR_CHECK_ALLOC_ADD(&alloc_len, text_len, 1);
tag->tag_name = git__malloc(alloc_len);
GITERR_CHECK_ALLOC(tag->tag_name);
memcpy(tag->tag_name, buffer, text_len);
tag->tag_name[text_len] = '\0';
buffer = search + 1;
tag->tagger = NULL;
if (buffer < buffer_end && *buffer != '\n') {
tag->tagger = git__malloc(sizeof(git_signature));
GITERR_CHECK_ALLOC(tag->tagger);
if (git_signature__parse(tag->tagger, &buffer, buffer_end, "tagger ", '\n') < 0)
return -1;
}
tag->message = NULL;
if (buffer < buffer_end) {
/* If we're not at the end of the header, search for it */
if( *buffer != '\n' ) {
search = strstr(buffer, "\n\n");
if (search)
buffer = search + 1;
else
return tag_error("tag contains no message");
}
text_len = buffer_end - ++buffer;
GITERR_CHECK_ALLOC_ADD(&alloc_len, text_len, 1);
tag->message = git__malloc(alloc_len);
GITERR_CHECK_ALLOC(tag->message);
memcpy(tag->message, buffer, text_len);
tag->message[text_len] = '\0';
}
return 0;
}
int git_tag__parse_raw(void *_tag, const char *data, size_t size)
{
return tag_parse(_tag, data, data + size);
}
int git_tag__parse(void *_tag, git_odb_object *odb_obj)
{
git_tag *tag = _tag;
const char *buffer = git_odb_object_data(odb_obj);
const char *buffer_end = buffer + git_odb_object_size(odb_obj);
return tag_parse(tag, buffer, buffer_end);
}
static int retrieve_tag_reference(
git_reference **tag_reference_out,
git_buf *ref_name_out,
git_repository *repo,
const char *tag_name)
{
git_reference *tag_ref;
int error;
*tag_reference_out = NULL;
if (git_buf_joinpath(ref_name_out, GIT_REFS_TAGS_DIR, tag_name) < 0)
return -1;
error = git_reference_lookup(&tag_ref, repo, ref_name_out->ptr);
if (error < 0)
return error; /* Be it not foundo or corrupted */
*tag_reference_out = tag_ref;
return 0;
}
static int retrieve_tag_reference_oid(
git_oid *oid,
git_buf *ref_name_out,
git_repository *repo,
const char *tag_name)
{
if (git_buf_joinpath(ref_name_out, GIT_REFS_TAGS_DIR, tag_name) < 0)
return -1;
return git_reference_name_to_id(oid, repo, ref_name_out->ptr);
}
static int write_tag_annotation(
git_oid *oid,
git_repository *repo,
const char *tag_name,
const git_object *target,
const git_signature *tagger,
const char *message)
{
git_buf tag = GIT_BUF_INIT;
git_odb *odb;
git_oid__writebuf(&tag, "object ", git_object_id(target));
git_buf_printf(&tag, "type %s\n", git_object_type2string(git_object_type(target)));
git_buf_printf(&tag, "tag %s\n", tag_name);
git_signature__writebuf(&tag, "tagger ", tagger);
git_buf_putc(&tag, '\n');
if (git_buf_puts(&tag, message) < 0)
goto on_error;
if (git_repository_odb__weakptr(&odb, repo) < 0)
goto on_error;
if (git_odb_write(oid, odb, tag.ptr, tag.size, GIT_OBJ_TAG) < 0)
goto on_error;
git_buf_dispose(&tag);
return 0;
on_error:
git_buf_dispose(&tag);
giterr_set(GITERR_OBJECT, "failed to create tag annotation");
return -1;
}
static int git_tag_create__internal(
git_oid *oid,
git_repository *repo,
const char *tag_name,
const git_object *target,
const git_signature *tagger,
const char *message,
int allow_ref_overwrite,
int create_tag_annotation)
{
git_reference *new_ref = NULL;
git_buf ref_name = GIT_BUF_INIT;
int error;
assert(repo && tag_name && target);
assert(!create_tag_annotation || (tagger && message));
if (git_object_owner(target) != repo) {
giterr_set(GITERR_INVALID, "the given target does not belong to this repository");
return -1;
}
error = retrieve_tag_reference_oid(oid, &ref_name, repo, tag_name);
if (error < 0 && error != GIT_ENOTFOUND)
goto cleanup;
/** Ensure the tag name doesn't conflict with an already existing
* reference unless overwriting has explicitly been requested **/
if (error == 0 && !allow_ref_overwrite) {
git_buf_dispose(&ref_name);
giterr_set(GITERR_TAG, "tag already exists");
return GIT_EEXISTS;
}
if (create_tag_annotation) {
if (write_tag_annotation(oid, repo, tag_name, target, tagger, message) < 0)
return -1;
} else
git_oid_cpy(oid, git_object_id(target));
error = git_reference_create(&new_ref, repo, ref_name.ptr, oid, allow_ref_overwrite, NULL);
cleanup:
git_reference_free(new_ref);
git_buf_dispose(&ref_name);
return error;
}
int git_tag_create(
git_oid *oid,
git_repository *repo,
const char *tag_name,
const git_object *target,
const git_signature *tagger,
const char *message,
int allow_ref_overwrite)
{
return git_tag_create__internal(oid, repo, tag_name, target, tagger, message, allow_ref_overwrite, 1);
}
int git_tag_annotation_create(
git_oid *oid,
git_repository *repo,
const char *tag_name,
const git_object *target,
const git_signature *tagger,
const char *message)
{
assert(oid && repo && tag_name && target && tagger && message);
return write_tag_annotation(oid, repo, tag_name, target, tagger, message);
}
int git_tag_create_lightweight(
git_oid *oid,
git_repository *repo,
const char *tag_name,
const git_object *target,
int allow_ref_overwrite)
{
return git_tag_create__internal(oid, repo, tag_name, target, NULL, NULL, allow_ref_overwrite, 0);
}
int git_tag_create_frombuffer(git_oid *oid, git_repository *repo, const char *buffer, int allow_ref_overwrite)
{
git_tag tag;
int error;
git_odb *odb;
git_odb_stream *stream;
git_odb_object *target_obj;
git_reference *new_ref = NULL;
git_buf ref_name = GIT_BUF_INIT;
assert(oid && buffer);
memset(&tag, 0, sizeof(tag));
if (git_repository_odb__weakptr(&odb, repo) < 0)
return -1;
/* validate the buffer */
if (tag_parse(&tag, buffer, buffer + strlen(buffer)) < 0)
return -1;
/* validate the target */
if (git_odb_read(&target_obj, odb, &tag.target) < 0)
goto on_error;
if (tag.type != target_obj->cached.type) {
giterr_set(GITERR_TAG, "the type for the given target is invalid");
goto on_error;
}
error = retrieve_tag_reference_oid(oid, &ref_name, repo, tag.tag_name);
if (error < 0 && error != GIT_ENOTFOUND)
goto on_error;
/* We don't need these objects after this */
git_signature_free(tag.tagger);
git__free(tag.tag_name);
git__free(tag.message);
git_odb_object_free(target_obj);
/** Ensure the tag name doesn't conflict with an already existing
* reference unless overwriting has explicitly been requested **/
if (error == 0 && !allow_ref_overwrite) {
giterr_set(GITERR_TAG, "tag already exists");
return GIT_EEXISTS;
}
/* write the buffer */
if ((error = git_odb_open_wstream(
&stream, odb, strlen(buffer), GIT_OBJ_TAG)) < 0)
return error;
if (!(error = git_odb_stream_write(stream, buffer, strlen(buffer))))
error = git_odb_stream_finalize_write(oid, stream);
git_odb_stream_free(stream);
if (error < 0) {
git_buf_dispose(&ref_name);
return error;
}
error = git_reference_create(
&new_ref, repo, ref_name.ptr, oid, allow_ref_overwrite, NULL);
git_reference_free(new_ref);
git_buf_dispose(&ref_name);
return error;
on_error:
git_signature_free(tag.tagger);
git__free(tag.tag_name);
git__free(tag.message);
git_odb_object_free(target_obj);
return -1;
}
int git_tag_delete(git_repository *repo, const char *tag_name)
{
git_reference *tag_ref;
git_buf ref_name = GIT_BUF_INIT;
int error;
error = retrieve_tag_reference(&tag_ref, &ref_name, repo, tag_name);
git_buf_dispose(&ref_name);
if (error < 0)
return error;
error = git_reference_delete(tag_ref);
git_reference_free(tag_ref);
return error;
}
typedef struct {
git_repository *repo;
git_tag_foreach_cb cb;
void *cb_data;
} tag_cb_data;
static int tags_cb(const char *ref, void *data)
{
int error;
git_oid oid;
tag_cb_data *d = (tag_cb_data *)data;
if (git__prefixcmp(ref, GIT_REFS_TAGS_DIR) != 0)
return 0; /* no tag */
if (!(error = git_reference_name_to_id(&oid, d->repo, ref))) {
if ((error = d->cb(ref, &oid, d->cb_data)) != 0)
giterr_set_after_callback_function(error, "git_tag_foreach");
}
return error;
}
int git_tag_foreach(git_repository *repo, git_tag_foreach_cb cb, void *cb_data)
{
tag_cb_data data;
assert(repo && cb);
data.cb = cb;
data.cb_data = cb_data;
data.repo = repo;
return git_reference_foreach_name(repo, &tags_cb, &data);
}
typedef struct {
git_vector *taglist;
const char *pattern;
} tag_filter_data;
#define GIT_REFS_TAGS_DIR_LEN strlen(GIT_REFS_TAGS_DIR)
static int tag_list_cb(const char *tag_name, git_oid *oid, void *data)
{
tag_filter_data *filter = (tag_filter_data *)data;
GIT_UNUSED(oid);
if (!*filter->pattern ||
p_fnmatch(filter->pattern, tag_name + GIT_REFS_TAGS_DIR_LEN, 0) == 0)
{
char *matched = git__strdup(tag_name + GIT_REFS_TAGS_DIR_LEN);
GITERR_CHECK_ALLOC(matched);
return git_vector_insert(filter->taglist, matched);
}
return 0;
}
int git_tag_list_match(git_strarray *tag_names, const char *pattern, git_repository *repo)
{
int error;
tag_filter_data filter;
git_vector taglist;
assert(tag_names && repo && pattern);
if ((error = git_vector_init(&taglist, 8, NULL)) < 0)
return error;
filter.taglist = &taglist;
filter.pattern = pattern;
error = git_tag_foreach(repo, &tag_list_cb, (void *)&filter);
if (error < 0)
git_vector_free(&taglist);
tag_names->strings =
(char **)git_vector_detach(&tag_names->count, NULL, &taglist);
return 0;
}
int git_tag_list(git_strarray *tag_names, git_repository *repo)
{
return git_tag_list_match(tag_names, "", repo);
}
int git_tag_peel(git_object **tag_target, const git_tag *tag)
{
return git_object_peel(tag_target, (const git_object *)tag, GIT_OBJ_ANY);
}