Hash :
1744fafe
Author :
Date :
2012-01-17T15:49:47
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/*
* Copyright (C) 2009-2011 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 "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"
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;
}
}
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__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 int quickcheck_repository_dir(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, 0) < 0)
return GIT_ERROR;
/* Ensure HEAD file exists */
if (git_path_contains_file(repository_path, GIT_HEAD_FILE, 0) < 0)
return GIT_ERROR;
if (git_path_contains_dir(repository_path, GIT_REFS_DIR, 0) < 0)
return GIT_ERROR;
return GIT_SUCCESS;
}
static git_repository *repository_alloc(void)
{
int error;
git_repository *repo = git__malloc(sizeof(git_repository));
if (!repo)
return NULL;
memset(repo, 0x0, sizeof(git_repository));
error = git_cache_init(&repo->objects, GIT_DEFAULT_CACHE_SIZE, &git_object__free);
if (error < GIT_SUCCESS) {
git__free(repo);
return NULL;
}
return repo;
}
static int load_config_data(git_repository *repo)
{
int error, is_bare;
git_config *config;
error = git_repository_config__weakptr(&config, repo);
if (error < GIT_SUCCESS)
return error;
error = git_config_get_bool(config, "core.bare", &is_bare);
if (error == GIT_SUCCESS)
repo->is_bare = is_bare;
/* TODO: what else can we load/cache here? */
return GIT_SUCCESS;
}
static int load_workdir(git_repository *repo)
{
int error;
git_buf workdir_buf = GIT_BUF_INIT;
if (repo->is_bare)
return GIT_SUCCESS;
git_path_dirname_r(&workdir_buf, repo->path_repository);
git_path_to_dir(&workdir_buf);
if ((error = git_buf_lasterror(&workdir_buf)) == GIT_SUCCESS)
repo->workdir = git_buf_detach(&workdir_buf);
git_buf_free(&workdir_buf);
return error;
}
int git_repository_open(git_repository **repo_out, const char *path)
{
int error = GIT_SUCCESS;
git_buf path_buf = GIT_BUF_INIT;
git_repository *repo = NULL;
error = git_path_prettify_dir(&path_buf, path, NULL);
if (error < GIT_SUCCESS)
goto cleanup;
/**
* Check if the path we've been given is actually the path
* of the working dir, by testing if it contains a `.git`
* folder inside of it.
*/
git_path_contains_dir(&path_buf, DOT_GIT, 1); /* append on success */
/* ignore error, since it just means `path/.git` doesn't exist */
if (quickcheck_repository_dir(&path_buf) < GIT_SUCCESS) {
error = git__throw(GIT_ENOTAREPO,
"The given path (%s) is not a valid Git repository", git_buf_cstr(&path_buf));
goto cleanup;
}
repo = repository_alloc();
if (repo == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
repo->path_repository = git_buf_detach(&path_buf);
if (repo->path_repository == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
error = load_config_data(repo);
if (error < GIT_SUCCESS)
goto cleanup;
error = load_workdir(repo);
if (error < GIT_SUCCESS)
goto cleanup;
*repo_out = repo;
return GIT_SUCCESS;
cleanup:
git_repository_free(repo);
git_buf_free(&path_buf);
return error;
}
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;
int error;
git_config *cfg = NULL;
assert(repo && out);
error = git_config_new(&cfg);
if (error < GIT_SUCCESS)
return error;
error = git_buf_joinpath(&config_path, repo->path_repository,
GIT_CONFIG_FILENAME_INREPO);
if (error < GIT_SUCCESS)
goto cleanup;
error = git_config_add_file_ondisk(cfg, config_path.ptr, 3);
git_buf_free(&config_path); /* done with config_path now */
if (error < GIT_SUCCESS)
goto cleanup;
if (global_config_path != NULL) {
error = git_config_add_file_ondisk(cfg, global_config_path, 2);
if (error < GIT_SUCCESS)
goto cleanup;
}
if (system_config_path != NULL) {
error = git_config_add_file_ondisk(cfg, system_config_path, 1);
if (error < GIT_SUCCESS)
goto cleanup;
}
*out = cfg;
return GIT_SUCCESS;
cleanup:
git_config_free(cfg);
*out = NULL;
return error;
}
int git_repository_config__weakptr(git_config **out, git_repository *repo)
{
if (repo->_config == NULL) {
int error;
git_buf global_buf = GIT_BUF_INIT, system_buf = GIT_BUF_INIT;
const char *global_config_path = NULL;
const char *system_config_path = NULL;
if (git_config_find_global_r(&global_buf) == GIT_SUCCESS)
global_config_path = global_buf.ptr;
if (git_config_find_system_r(&system_buf) == GIT_SUCCESS)
system_config_path = system_buf.ptr;
error = load_config(&repo->_config, repo, global_config_path, system_config_path);
git_buf_free(&global_buf);
git_buf_free(&system_buf);
if (error < GIT_SUCCESS)
return error;
GIT_REFCOUNT_OWN(repo->_config, repo);
}
*out = repo->_config;
return GIT_SUCCESS;
}
int git_repository_config(git_config **out, git_repository *repo)
{
int error = git_repository_config__weakptr(out, repo);
if (error == GIT_SUCCESS) {
GIT_REFCOUNT_INC(*out);
}
return error;
}
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) {
int error;
git_buf odb_path = GIT_BUF_INIT;
error = git_buf_joinpath(&odb_path, repo->path_repository, GIT_OBJECTS_DIR);
if (error < GIT_SUCCESS)
return error;
error = git_odb_open(&repo->_odb, odb_path.ptr);
git_buf_free(&odb_path); /* done with path */
if (error < GIT_SUCCESS)
return error;
GIT_REFCOUNT_OWN(repo->_odb, repo);
}
*out = repo->_odb;
return GIT_SUCCESS;
}
int git_repository_odb(git_odb **out, git_repository *repo)
{
int error = git_repository_odb__weakptr(out, repo);
if (error == GIT_SUCCESS) {
GIT_REFCOUNT_INC(*out);
}
return error;
}
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 error;
git_buf index_path = GIT_BUF_INIT;
error = git_buf_joinpath(&index_path, repo->path_repository, GIT_INDEX_FILE);
if (error < GIT_SUCCESS)
return error;
error = git_index_open(&repo->_index, index_path.ptr);
git_buf_free(&index_path); /* done with path */
if (error < GIT_SUCCESS)
return error;
GIT_REFCOUNT_OWN(repo->_index, repo);
}
*out = repo->_index;
return GIT_SUCCESS;
}
int git_repository_index(git_index **out, git_repository *repo)
{
int error = git_repository_index__weakptr(out, repo);
if (error == GIT_SUCCESS) {
GIT_REFCOUNT_INC(*out);
}
return error;
}
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 retrieve_device(dev_t *device_out, const char *path)
{
struct stat path_info;
assert(device_out);
if (p_lstat(path, &path_info))
return git__throw(GIT_EOSERR, "Failed to get file informations: %s", path);
*device_out = path_info.st_dev;
return GIT_SUCCESS;
}
/*
* 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 retrieve_ceiling_directories_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, const char *base_path)
{
git_fbuffer file;
int error;
assert(path_out && file_path);
error = git_futils_readbuffer(&file, file_path);
if (error < GIT_SUCCESS)
return error;
if (git__prefixcmp((char *)file.data, GIT_FILE_CONTENT_PREFIX)) {
git_futils_freebuffer(&file);
return git__throw(GIT_ENOTFOUND, "Invalid gitfile format `%s`", file_path);
}
git_futils_fbuffer_rtrim(&file);
if (strlen(GIT_FILE_CONTENT_PREFIX) == file.len) {
git_futils_freebuffer(&file);
return git__throw(GIT_ENOTFOUND, "No path in git file `%s`", file_path);
}
error = git_path_prettify_dir(path_out,
((char *)file.data) + strlen(GIT_FILE_CONTENT_PREFIX), base_path);
git_futils_freebuffer(&file);
if (error == GIT_SUCCESS && git_path_exists(path_out->ptr) == 0)
return GIT_SUCCESS;
return git__throw(GIT_EOBJCORRUPTED, "The `.git` file points to a nonexistent path");
}
int git_repository_discover(
char *repository_path,
size_t size,
const char *start_path,
int across_fs,
const char *ceiling_dirs)
{
int error, ceiling_offset;
git_buf bare_path = GIT_BUF_INIT;
git_buf normal_path = GIT_BUF_INIT;
git_buf *found_path = NULL;
dev_t current_device = 0;
assert(start_path && repository_path);
*repository_path = '\0';
error = git_path_prettify_dir(&bare_path, start_path, NULL);
if (error < GIT_SUCCESS)
goto cleanup;
if (!across_fs) {
error = retrieve_device(¤t_device, bare_path.ptr);
if (error < GIT_SUCCESS)
goto cleanup;
}
ceiling_offset = retrieve_ceiling_directories_offset(bare_path.ptr, ceiling_dirs);
while(1) {
error = git_buf_joinpath(&normal_path, bare_path.ptr, DOT_GIT);
if (error < GIT_SUCCESS)
break;
/**
* If the `.git` file is regular instead of
* a directory, it should contain the path of the actual git repository
*/
if (git_path_isfile(normal_path.ptr) == GIT_SUCCESS) {
git_buf gitfile_path = GIT_BUF_INIT;
error = read_gitfile(&gitfile_path, normal_path.ptr, bare_path.ptr);
if (error < GIT_SUCCESS)
git__rethrow(error, "Unable to read git file `%s`", normal_path.ptr);
else if ((error = quickcheck_repository_dir(&gitfile_path)) < GIT_SUCCESS)
git__throw(GIT_ENOTFOUND,
"The `.git` file found at '%s' points "
"to a nonexistent git folder", normal_path.ptr);
else {
git_buf_swap(&normal_path, &gitfile_path);
found_path = &normal_path;
}
git_buf_free(&gitfile_path);
break;
}
/**
* If the `.git` file is a folder, we check inside of it
*/
if (git_path_isdir(normal_path.ptr) == GIT_SUCCESS) {
error = quickcheck_repository_dir(&normal_path);
if (error == GIT_SUCCESS) {
found_path = &normal_path;
break;
}
}
/**
* Otherwise, the repository may be bare, let's check
* the root anyway
*/
error = quickcheck_repository_dir(&bare_path);
if (error == GIT_SUCCESS) {
found_path = &bare_path;
break;
}
/**
* If we didn't find it, walk up the tree
*/
error = git_path_dirname_r(&normal_path, bare_path.ptr);
if (error < GIT_SUCCESS) {
git__rethrow(GIT_EOSERR, "Failed to dirname '%s'", bare_path.ptr);
break;
}
git_buf_swap(&bare_path, &normal_path);
if (!across_fs) {
dev_t new_device;
error = retrieve_device(&new_device, bare_path.ptr);
if (error < GIT_SUCCESS || current_device != new_device) {
error = git__throw(GIT_ENOTAREPO,
"Not a git repository (or any parent up to mount parent %s)\n"
"Stopping at filesystem boundary.", normal_path.ptr);
break;
}
current_device = new_device;
}
/* nothing has been found, lets try the parent directory
* but stop if we hit one of the ceiling directories
*/
if (bare_path.ptr[ceiling_offset] == '\0') {
error = git__throw(GIT_ENOTAREPO,
"Not a git repository (or any of the parent directories): %s", start_path);
break;
}
}
assert(found_path || error != GIT_SUCCESS);
if (found_path) {
if ((error = git_path_to_dir(found_path)) < GIT_SUCCESS)
git__rethrow(error, "Could not convert git repository to directory");
else if (size < (size_t)(found_path->size + 1))
error = git__throw(GIT_ESHORTBUFFER,
"The repository buffer is not long enough to "
"handle the repository path `%s`", found_path->ptr);
else
git_buf_copy_cstr(repository_path, size, found_path);
}
cleanup:
git_buf_free(&bare_path);
git_buf_free(&normal_path);
return error;
}
static int repo_init_reinit(const char *repository_path, int is_bare)
{
/* TODO: reinit the repository */
return git__throw(GIT_ENOTIMPLEMENTED,
"Failed to reinitialize the %srepository at '%s'. "
"This feature is not yet implemented",
is_bare ? "bare " : "", repository_path);
}
static int repo_init_createhead(const char *git_dir)
{
int error;
git_buf ref_path = GIT_BUF_INIT;
git_filebuf ref = GIT_FILEBUF_INIT;
if (!(error = git_buf_joinpath(&ref_path, git_dir, GIT_HEAD_FILE)) &&
!(error = git_filebuf_open(&ref, ref_path.ptr, 0)) &&
!(error = git_filebuf_printf(&ref, "ref: refs/heads/master\n")))
error = git_filebuf_commit(&ref, GIT_REFS_FILE_MODE);
git_buf_free(&ref_path);
return error;
}
static int repo_init_config(const char *git_dir, int is_bare)
{
git_buf cfg_path = GIT_BUF_INIT;
git_config *config = NULL;
int error = GIT_SUCCESS;
#define SET_REPO_CONFIG(type, name, val) {\
error = git_config_set_##type(config, name, val);\
if (error < GIT_SUCCESS)\
goto cleanup;\
}
error = git_buf_joinpath(&cfg_path, git_dir, GIT_CONFIG_FILENAME_INREPO);
if (error < GIT_SUCCESS)
goto cleanup;
error = git_config_open_ondisk(&config, cfg_path.ptr);
if (error < GIT_SUCCESS)
goto cleanup;
SET_REPO_CONFIG(bool, "core.bare", is_bare);
SET_REPO_CONFIG(int32, "core.repositoryformatversion", 0);
/* TODO: what other defaults? */
cleanup:
git_buf_free(&cfg_path);
git_config_free(config);
return error;
}
static int repo_init_structure(const char *git_dir, int is_bare)
{
int error, 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 */
error = git_futils_mkdir_r(git_dir, NULL, is_bare ?
GIT_BARE_DIR_MODE : GIT_DIR_MODE);
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to initialize repository structure. Could not mkdir");
/* Hides the ".git" directory */
if (!is_bare) {
#ifdef GIT_WIN32
error = p_hide_directory__w32(git_dir);
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to initialize repository structure");
#endif
}
/* Make subdirectories as needed */
for (i = 0; dirs[i].dir != NULL; ++i) {
error = git_futils_mkdir_r(dirs[i].dir, git_dir, dirs[i].mode);
if (error < GIT_SUCCESS)
return git__rethrow(error,
"Failed to create repository folder `%s`", dirs[i].dir);
}
/* TODO: what's left? templates? */
return error;
}
int git_repository_init(git_repository **repo_out, const char *path, unsigned is_bare)
{
int error = GIT_SUCCESS;
git_repository *repo = NULL;
git_buf repository_path = GIT_BUF_INIT;
assert(repo_out && path);
error = git_buf_joinpath(&repository_path, path, is_bare ? "" : GIT_DIR);
if (error < GIT_SUCCESS)
return error;
if (git_path_isdir(repository_path.ptr) == GIT_SUCCESS) {
if (quickcheck_repository_dir(&repository_path) == GIT_SUCCESS) {
error = repo_init_reinit(repository_path.ptr, is_bare);
git_buf_free(&repository_path);
return error;
}
}
if (!(error = repo_init_structure(repository_path.ptr, is_bare)) &&
!(error = repo_init_config(repository_path.ptr, is_bare)) &&
!(error = repo_init_createhead(repository_path.ptr)))
error = git_repository_open(repo_out, repository_path.ptr);
else
git_repository_free(repo);
git_buf_free(&repository_path);
if (error != GIT_SUCCESS)
git__rethrow(error, "Failed to (re)init the repository `%s`", path);
return error;
}
int git_repository_head_detached(git_repository *repo)
{
git_reference *ref;
int error;
size_t _size;
git_otype type;
git_odb *odb = NULL;
error = git_repository_odb__weakptr(&odb, repo);
if (error < GIT_SUCCESS)
return error;
error = git_reference_lookup(&ref, repo, GIT_HEAD_FILE);
if (error < GIT_SUCCESS)
return error;
if (git_reference_type(ref) == GIT_REF_SYMBOLIC) {
git_reference_free(ref);
return 0;
}
error = git_odb_read_header(&_size, &type, odb, git_reference_oid(ref));
git_reference_free(ref);
if (error < GIT_SUCCESS)
return error;
if (type != GIT_OBJ_COMMIT)
return git__throw(GIT_EOBJCORRUPTED, "HEAD is not a commit");
return 1;
}
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 < GIT_SUCCESS)
return git__rethrow(GIT_ENOTAREPO, "Failed to locate the HEAD");
error = git_reference_resolve(&resolved_ref, ref);
if (error < GIT_SUCCESS) {
git_reference_free(ref);
return git__rethrow(error, "Failed to resolve the HEAD");
}
git_reference_free(ref);
*head_out = resolved_ref;
return GIT_SUCCESS;
}
int git_repository_head_orphan(git_repository *repo)
{
git_reference *ref;
int error;
error = git_repository_head(&ref, repo);
if (error == GIT_SUCCESS)
git_reference_free(ref);
return error == GIT_ENOTFOUND ? 1 : error;
}
int git_repository_is_empty(git_repository *repo)
{
git_reference *head = NULL, *branch = NULL;
int error;
error = git_reference_lookup(&head, repo, "HEAD");
if (error < GIT_SUCCESS)
return git__throw(error, "Corrupted repository. HEAD does not exist");
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);
return error == GIT_ENOTFOUND ? 1 : error;
}
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)
{
assert(repo && workdir);
free(repo->workdir);
repo->workdir = git__strdup(workdir);
if (repo->workdir == NULL)
return GIT_ENOMEM;
repo->is_bare = 0;
return GIT_SUCCESS;
}
int git_repository_is_bare(git_repository *repo)
{
assert(repo);
return repo->is_bare;
}