/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* 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 <stdarg.h>
#include <ctype.h>
#include "git2/object.h"
#include "common.h"
#include "repository.h"
#include "commit.h"
#include "tag.h"
#include "blob.h"
#include "fileops.h"
#include "config.h"
#include "refs.h"
#define GIT_OBJECTS_INFO_DIR GIT_OBJECTS_DIR "info/"
#define GIT_OBJECTS_PACK_DIR GIT_OBJECTS_DIR "pack/"
#define GIT_FILE_CONTENT_PREFIX "gitdir:"
#define GIT_BRANCH_MASTER "master"
#define GIT_CONFIG_CORE_REPOSITORYFORMATVERSION "core.repositoryformatversion"
#define GIT_REPOSITORYFORMATVERSION 0
static void drop_odb(git_repository *repo)
{
if (repo->_odb != NULL) {
GIT_REFCOUNT_OWN(repo->_odb, NULL);
git_odb_free(repo->_odb);
repo->_odb = NULL;
}
}
static void drop_config(git_repository *repo)
{
if (repo->_config != NULL) {
GIT_REFCOUNT_OWN(repo->_config, NULL);
git_config_free(repo->_config);
repo->_config = NULL;
}
git_repository__cvar_cache_clear(repo);
}
static void drop_index(git_repository *repo)
{
if (repo->_index != NULL) {
GIT_REFCOUNT_OWN(repo->_index, NULL);
git_index_free(repo->_index);
repo->_index = NULL;
}
}
void git_repository_free(git_repository *repo)
{
if (repo == NULL)
return;
git_cache_free(&repo->objects);
git_repository__refcache_free(&repo->references);
git_attr_cache_flush(repo);
git_submodule_config_free(repo);
git__free(repo->path_repository);
git__free(repo->workdir);
drop_config(repo);
drop_index(repo);
drop_odb(repo);
git__free(repo);
}
/*
* Git repository open methods
*
* Open a repository object from its path
*/
static bool valid_repository_path(git_buf *repository_path)
{
/* Check OBJECTS_DIR first, since it will generate the longest path name */
if (git_path_contains_dir(repository_path, GIT_OBJECTS_DIR) == false)
return false;
/* Ensure HEAD file exists */
if (git_path_contains_file(repository_path, GIT_HEAD_FILE) == false)
return false;
if (git_path_contains_dir(repository_path, GIT_REFS_DIR) == false)
return false;
return true;
}
static git_repository *repository_alloc(void)
{
git_repository *repo = git__malloc(sizeof(git_repository));
if (!repo)
return NULL;
memset(repo, 0x0, sizeof(git_repository));
if (git_cache_init(&repo->objects, GIT_DEFAULT_CACHE_SIZE, &git_object__free) < 0) {
git__free(repo);
return NULL;
}
/* set all the entries in the cvar cache to `unset` */
git_repository__cvar_cache_clear(repo);
return repo;
}
static int load_config_data(git_repository *repo)
{
int is_bare;
git_config *config;
if (git_repository_config__weakptr(&config, repo) < 0)
return -1;
if (git_config_get_bool(config, "core.bare", &is_bare) < 0)
return -1; /* FIXME: We assume that a missing core.bare
variable is an error. Is this right? */
repo->is_bare = is_bare;
return 0;
}
static int load_workdir(git_repository *repo, git_buf *parent_path)
{
int error;
git_config *config;
const char *worktree;
git_buf worktree_buf = GIT_BUF_INIT;
if (repo->is_bare)
return 0;
if (git_repository_config__weakptr(&config, repo) < 0)
return -1;
error = git_config_get_string(config, "core.worktree", &worktree);
if (!error && worktree != NULL)
repo->workdir = git__strdup(worktree);
else if (error != GIT_ENOTFOUND)
return error;
else {
giterr_clear();
if (parent_path && git_path_isdir(parent_path->ptr))
repo->workdir = git_buf_detach(parent_path);
else {
git_path_dirname_r(&worktree_buf, repo->path_repository);
git_path_to_dir(&worktree_buf);
repo->workdir = git_buf_detach(&worktree_buf);
}
}
GITERR_CHECK_ALLOC(repo->workdir);
return 0;
}
/*
* This function returns furthest offset into path where a ceiling dir
* is found, so we can stop processing the path at that point.
*
* Note: converting this to use git_bufs instead of GIT_PATH_MAX buffers on
* the stack could remove directories name limits, but at the cost of doing
* repeated malloc/frees inside the loop below, so let's not do it now.
*/
static int find_ceiling_dir_offset(
const char *path,
const char *ceiling_directories)
{
char buf[GIT_PATH_MAX + 1];
char buf2[GIT_PATH_MAX + 1];
const char *ceil, *sep;
int len, max_len = -1;
int min_len;
assert(path);
min_len = git_path_root(path) + 1;
if (ceiling_directories == NULL || min_len == 0)
return min_len;
for (sep = ceil = ceiling_directories; *sep; ceil = sep + 1) {
for (sep = ceil; *sep && *sep != GIT_PATH_LIST_SEPARATOR; sep++);
len = sep - ceil;
if (len == 0 || len >= (int)sizeof(buf) || git_path_root(ceil) == -1)
continue;
strncpy(buf, ceil, len);
buf[len] = '\0';
if (p_realpath(buf, buf2) == NULL)
continue;
len = strlen(buf2);
if (len > 0 && buf2[len-1] == '/')
buf[--len] = '\0';
if (!strncmp(path, buf2, len) &&
path[len] == '/' &&
len > max_len)
{
max_len = len;
}
}
return max_len <= min_len ? min_len : max_len;
}
/*
* Read the contents of `file_path` and set `path_out` to the repo dir that
* it points to. Before calling, set `path_out` to the base directory that
* should be used if the contents of `file_path` are a relative path.
*/
static int read_gitfile(git_buf *path_out, const char *file_path)
{
int error = 0;
git_buf file = GIT_BUF_INIT;
size_t prefix_len = strlen(GIT_FILE_CONTENT_PREFIX);
assert(path_out && file_path);
if (git_futils_readbuffer(&file, file_path) < 0)
return -1;
git_buf_rtrim(&file);
if (file.size <= prefix_len ||
memcmp(file.ptr, GIT_FILE_CONTENT_PREFIX, prefix_len) != 0)
{
giterr_set(GITERR_REPOSITORY, "The `.git` file at '%s' is malformed", file_path);
error = -1;
}
else if ((error = git_path_dirname_r(path_out, file_path)) >= 0) {
const char *gitlink = ((const char *)file.ptr) + prefix_len;
while (*gitlink && isspace(*gitlink)) gitlink++;
error = git_path_prettify_dir(path_out, gitlink, path_out->ptr);
}
git_buf_free(&file);
return error;
}
static int find_repo(
git_buf *repo_path,
git_buf *parent_path,
const char *start_path,
uint32_t flags,
const char *ceiling_dirs)
{
int error;
git_buf path = GIT_BUF_INIT;
struct stat st;
dev_t initial_device = 0;
bool try_with_dot_git = false;
int ceiling_offset;
git_buf_free(repo_path);
if ((error = git_path_prettify_dir(&path, start_path, NULL)) < 0)
return error;
ceiling_offset = find_ceiling_dir_offset(path.ptr, ceiling_dirs);
if ((error = git_buf_joinpath(&path, path.ptr, DOT_GIT)) < 0)
return error;
while (!error && !repo_path->size) {
if (p_stat(path.ptr, &st) == 0) {
/* check that we have not crossed device boundaries */
if (initial_device == 0)
initial_device = st.st_dev;
else if (st.st_dev != initial_device &&
(flags & GIT_REPOSITORY_OPEN_CROSS_FS) == 0)
break;
if (S_ISDIR(st.st_mode)) {
if (valid_repository_path(&path)) {
git_path_to_dir(&path);
git_buf_set(repo_path, path.ptr, path.size);
break;
}
}
else if (S_ISREG(st.st_mode)) {
git_buf repo_link = GIT_BUF_INIT;
if (!(error = read_gitfile(&repo_link, path.ptr))) {
if (valid_repository_path(&repo_link))
git_buf_swap(repo_path, &repo_link);
git_buf_free(&repo_link);
break;
}
git_buf_free(&repo_link);
}
}
/* move up one directory level */
if (git_path_dirname_r(&path, path.ptr) < 0) {
error = -1;
break;
}
if (try_with_dot_git) {
/* if we tried original dir with and without .git AND either hit
* directory ceiling or NO_SEARCH was requested, then be done.
*/
if (path.ptr[ceiling_offset] == '\0' ||
(flags & GIT_REPOSITORY_OPEN_NO_SEARCH) != 0)
break;
/* otherwise look first for .git item */
error = git_buf_joinpath(&path, path.ptr, DOT_GIT);
}
try_with_dot_git = !try_with_dot_git;
}
if (!error && parent_path != NULL) {
if (!repo_path->size)
git_buf_clear(parent_path);
else {
git_path_dirname_r(parent_path, path.ptr);
git_path_to_dir(parent_path);
}
if (git_buf_oom(parent_path))
return -1;
}
git_buf_free(&path);
if (!repo_path->size && !error) {
giterr_set(GITERR_REPOSITORY,
"Could not find repository from '%s'", start_path);
error = GIT_ENOTFOUND;
}
return error;
}
int git_repository_open_ext(
git_repository **repo_ptr,
const char *start_path,
uint32_t flags,
const char *ceiling_dirs)
{
int error;
git_buf path = GIT_BUF_INIT, parent = GIT_BUF_INIT;
git_repository *repo;
*repo_ptr = NULL;
if ((error = find_repo(&path, &parent, start_path, flags, ceiling_dirs)) < 0)
return error;
repo = repository_alloc();
GITERR_CHECK_ALLOC(repo);
repo->path_repository = git_buf_detach(&path);
GITERR_CHECK_ALLOC(repo->path_repository);
if ((error = load_config_data(repo)) < 0 ||
(error = load_workdir(repo, &parent)) < 0)
{
git_repository_free(repo);
return error;
}
git_buf_free(&parent);
*repo_ptr = repo;
return 0;
}
int git_repository_open(git_repository **repo_out, const char *path)
{
return git_repository_open_ext(
repo_out, path, GIT_REPOSITORY_OPEN_NO_SEARCH, NULL);
}
int git_repository_discover(
char *repository_path,
size_t size,
const char *start_path,
int across_fs,
const char *ceiling_dirs)
{
git_buf path = GIT_BUF_INIT;
uint32_t flags = across_fs ? GIT_REPOSITORY_OPEN_CROSS_FS : 0;
assert(start_path && repository_path && size > 0);
*repository_path = '\0';
if (find_repo(&path, NULL, start_path, flags, ceiling_dirs) < 0)
return -1;
if (size < (size_t)(path.size + 1)) {
giterr_set(GITERR_REPOSITORY,
"The given buffer is too long to store the discovered path");
git_buf_free(&path);
return -1;
}
/* success: we discovered a repository */
git_buf_copy_cstr(repository_path, size, &path);
git_buf_free(&path);
return 0;
}
static int load_config(
git_config **out,
git_repository *repo,
const char *global_config_path,
const char *system_config_path)
{
git_buf config_path = GIT_BUF_INIT;
git_config *cfg = NULL;
assert(repo && out);
if (git_config_new(&cfg) < 0)
return -1;
if (git_buf_joinpath(
&config_path, repo->path_repository, GIT_CONFIG_FILENAME_INREPO) < 0)
goto on_error;
if (git_config_add_file_ondisk(cfg, config_path.ptr, 3) < 0)
goto on_error;
git_buf_free(&config_path);
if (global_config_path != NULL) {
if (git_config_add_file_ondisk(cfg, global_config_path, 2) < 0)
goto on_error;
}
if (system_config_path != NULL) {
if (git_config_add_file_ondisk(cfg, system_config_path, 1) < 0)
goto on_error;
}
*out = cfg;
return 0;
on_error:
git_buf_free(&config_path);
git_config_free(cfg);
*out = NULL;
return -1;
}
int git_repository_config__weakptr(git_config **out, git_repository *repo)
{
if (repo->_config == NULL) {
git_buf global_buf = GIT_BUF_INIT, system_buf = GIT_BUF_INIT;
int res;
const char *global_config_path = NULL;
const char *system_config_path = NULL;
if (git_config_find_global_r(&global_buf) == 0)
global_config_path = global_buf.ptr;
if (git_config_find_system_r(&system_buf) == 0)
system_config_path = system_buf.ptr;
res = load_config(&repo->_config, repo, global_config_path, system_config_path);
git_buf_free(&global_buf);
git_buf_free(&system_buf);
if (res < 0)
return -1;
GIT_REFCOUNT_OWN(repo->_config, repo);
}
*out = repo->_config;
return 0;
}
int git_repository_config(git_config **out, git_repository *repo)
{
if (git_repository_config__weakptr(out, repo) < 0)
return -1;
GIT_REFCOUNT_INC(*out);
return 0;
}
void git_repository_set_config(git_repository *repo, git_config *config)
{
assert(repo && config);
drop_config(repo);
repo->_config = config;
GIT_REFCOUNT_OWN(repo->_config, repo);
}
int git_repository_odb__weakptr(git_odb **out, git_repository *repo)
{
assert(repo && out);
if (repo->_odb == NULL) {
git_buf odb_path = GIT_BUF_INIT;
int res;
if (git_buf_joinpath(&odb_path, repo->path_repository, GIT_OBJECTS_DIR) < 0)
return -1;
res = git_odb_open(&repo->_odb, odb_path.ptr);
git_buf_free(&odb_path); /* done with path */
if (res < 0)
return -1;
GIT_REFCOUNT_OWN(repo->_odb, repo);
}
*out = repo->_odb;
return 0;
}
int git_repository_odb(git_odb **out, git_repository *repo)
{
if (git_repository_odb__weakptr(out, repo) < 0)
return -1;
GIT_REFCOUNT_INC(*out);
return 0;
}
void git_repository_set_odb(git_repository *repo, git_odb *odb)
{
assert(repo && odb);
drop_odb(repo);
repo->_odb = odb;
GIT_REFCOUNT_OWN(repo->_odb, repo);
}
int git_repository_index__weakptr(git_index **out, git_repository *repo)
{
assert(out && repo);
if (repo->_index == NULL) {
int res;
git_buf index_path = GIT_BUF_INIT;
if (git_buf_joinpath(&index_path, repo->path_repository, GIT_INDEX_FILE) < 0)
return -1;
res = git_index_open(&repo->_index, index_path.ptr);
git_buf_free(&index_path); /* done with path */
if (res < 0)
return -1;
GIT_REFCOUNT_OWN(repo->_index, repo);
}
*out = repo->_index;
return 0;
}
int git_repository_index(git_index **out, git_repository *repo)
{
if (git_repository_index__weakptr(out, repo) < 0)
return -1;
GIT_REFCOUNT_INC(*out);
return 0;
}
void git_repository_set_index(git_repository *repo, git_index *index)
{
assert(repo && index);
drop_index(repo);
repo->_index = index;
GIT_REFCOUNT_OWN(repo->_index, repo);
}
static int check_repositoryformatversion(git_repository *repo)
{
git_config *config;
int version;
if (git_repository_config__weakptr(&config, repo) < 0)
return -1;
if (git_config_get_int32(config, GIT_CONFIG_CORE_REPOSITORYFORMATVERSION, &version) < 0)
return -1;
if (GIT_REPOSITORYFORMATVERSION < version) {
giterr_set(GITERR_REPOSITORY,
"Unsupported repository version %d. Only versions up to %d are supported.",
version, GIT_REPOSITORYFORMATVERSION);
return -1;
}
return 0;
}
static int repo_init_reinit(git_repository **repo_out, const char *repository_path, int is_bare)
{
git_repository *repo = NULL;
GIT_UNUSED(is_bare);
if (git_repository_open(&repo, repository_path) < 0)
return -1;
if (check_repositoryformatversion(repo) < 0) {
git_repository_free(repo);
return -1;
}
/* TODO: reinitialize the templates */
*repo_out = repo;
return 0;
}
static int repo_init_createhead(const char *git_dir)
{
git_buf ref_path = GIT_BUF_INIT;
git_filebuf ref = GIT_FILEBUF_INIT;
if (git_buf_joinpath(&ref_path, git_dir, GIT_HEAD_FILE) < 0 ||
git_filebuf_open(&ref, ref_path.ptr, 0) < 0 ||
git_filebuf_printf(&ref, "ref: refs/heads/master\n") < 0 ||
git_filebuf_commit(&ref, GIT_REFS_FILE_MODE) < 0)
return -1;
git_buf_free(&ref_path);
return 0;
}
static int repo_init_config(const char *git_dir, int is_bare)
{
git_buf cfg_path = GIT_BUF_INIT;
git_config *config = NULL;
#define SET_REPO_CONFIG(type, name, val) {\
if (git_config_set_##type(config, name, val) < 0) { \
git_buf_free(&cfg_path); \
git_config_free(config); \
return -1; } \
}
if (git_buf_joinpath(&cfg_path, git_dir, GIT_CONFIG_FILENAME_INREPO) < 0)
return -1;
if (git_config_open_ondisk(&config, cfg_path.ptr) < 0) {
git_buf_free(&cfg_path);
return -1;
}
SET_REPO_CONFIG(bool, "core.bare", is_bare);
SET_REPO_CONFIG(int32, GIT_CONFIG_CORE_REPOSITORYFORMATVERSION, GIT_REPOSITORYFORMATVERSION);
/* TODO: what other defaults? */
git_buf_free(&cfg_path);
git_config_free(config);
return 0;
}
static int repo_init_structure(const char *git_dir, int is_bare)
{
int i;
struct { const char *dir; mode_t mode; } dirs[] = {
{ GIT_OBJECTS_INFO_DIR, GIT_OBJECT_DIR_MODE }, /* '/objects/info/' */
{ GIT_OBJECTS_PACK_DIR, GIT_OBJECT_DIR_MODE }, /* '/objects/pack/' */
{ GIT_REFS_HEADS_DIR, GIT_REFS_DIR_MODE }, /* '/refs/heads/' */
{ GIT_REFS_TAGS_DIR, GIT_REFS_DIR_MODE }, /* '/refs/tags/' */
{ NULL, 0 }
};
/* Make the base directory */
if (git_futils_mkdir_r(git_dir, NULL, is_bare ? GIT_BARE_DIR_MODE : GIT_DIR_MODE) < 0)
return -1;
/* Hides the ".git" directory */
if (!is_bare) {
#ifdef GIT_WIN32
if (p_hide_directory__w32(git_dir) < 0) {
giterr_set(GITERR_REPOSITORY,
"Failed to mark Git repository folder as hidden");
return -1;
}
#endif
}
/* Make subdirectories as needed */
for (i = 0; dirs[i].dir != NULL; ++i) {
if (git_futils_mkdir_r(dirs[i].dir, git_dir, dirs[i].mode) < 0)
return -1;
}
/* TODO: what's left? templates? */
return 0;
}
int git_repository_init(git_repository **repo_out, const char *path, unsigned is_bare)
{
git_buf repository_path = GIT_BUF_INIT;
assert(repo_out && path);
if (git_buf_joinpath(&repository_path, path, is_bare ? "" : GIT_DIR) < 0)
return -1;
if (git_path_isdir(repository_path.ptr) == true) {
if (valid_repository_path(&repository_path) == true) {
int res = repo_init_reinit(repo_out, repository_path.ptr, is_bare);
git_buf_free(&repository_path);
return res;
}
}
if (repo_init_structure(repository_path.ptr, is_bare) < 0 ||
repo_init_config(repository_path.ptr, is_bare) < 0 ||
repo_init_createhead(repository_path.ptr) < 0 ||
git_repository_open(repo_out, repository_path.ptr) < 0) {
git_buf_free(&repository_path);
return -1;
}
git_buf_free(&repository_path);
return 0;
}
int git_repository_head_detached(git_repository *repo)
{
git_reference *ref;
git_odb *odb = NULL;
int exists;
if (git_repository_odb__weakptr(&odb, repo) < 0)
return -1;
if (git_reference_lookup(&ref, repo, GIT_HEAD_FILE) < 0)
return -1;
if (git_reference_type(ref) == GIT_REF_SYMBOLIC) {
git_reference_free(ref);
return 0;
}
exists = git_odb_exists(odb, git_reference_oid(ref));
git_reference_free(ref);
return exists;
}
int git_repository_head(git_reference **head_out, git_repository *repo)
{
git_reference *ref, *resolved_ref;
int error;
*head_out = NULL;
error = git_reference_lookup(&ref, repo, GIT_HEAD_FILE);
if (error < 0)
return error;
error = git_reference_resolve(&resolved_ref, ref);
if (error < 0) {
git_reference_free(ref);
return error;
}
git_reference_free(ref);
*head_out = resolved_ref;
return 0;
}
int git_repository_head_orphan(git_repository *repo)
{
git_reference *ref = NULL;
int error;
error = git_repository_head(&ref, repo);
git_reference_free(ref);
if (error == GIT_ENOTFOUND)
return 1;
if (error < 0)
return -1;
return 0;
}
int git_repository_is_empty(git_repository *repo)
{
git_reference *head = NULL, *branch = NULL;
int error;
if (git_reference_lookup(&head, repo, "HEAD") < 0)
return -1;
if (git_reference_type(head) != GIT_REF_SYMBOLIC) {
git_reference_free(head);
return 0;
}
if (strcmp(git_reference_target(head), "refs/heads/master") != 0) {
git_reference_free(head);
return 0;
}
error = git_reference_resolve(&branch, head);
git_reference_free(head);
git_reference_free(branch);
if (error == GIT_ENOTFOUND)
return 1;
if (error < 0)
return -1;
return 0;
}
const char *git_repository_path(git_repository *repo)
{
assert(repo);
return repo->path_repository;
}
const char *git_repository_workdir(git_repository *repo)
{
assert(repo);
if (repo->is_bare)
return NULL;
return repo->workdir;
}
int git_repository_set_workdir(git_repository *repo, const char *workdir)
{
git_buf path = GIT_BUF_INIT;
assert(repo && workdir);
if (git_path_prettify_dir(&path, workdir, NULL) < 0)
return -1;
free(repo->workdir);
repo->workdir = git_buf_detach(&path);
repo->is_bare = 0;
return 0;
}
int git_repository_is_bare(git_repository *repo)
{
assert(repo);
return repo->is_bare;
}
