[thirdparty/git.git] / environment.c

/*
 * We put all the git config variables in this same object
 * file, so that programs can link against the config parser
 * without having to link against all the rest of git.
 *
 * In particular, no need to bring in libz etc unless needed,
 * even if you might want to know where the git directory etc
 * are.
 */
#include "git-compat-util.h"
#include "abspath.h"
#include "branch.h"
#include "convert.h"
#include "environment.h"
#include "gettext.h"
#include "repository.h"
#include "config.h"
#include "refs.h"
#include "fmt-merge-msg.h"
#include "commit.h"
#include "strvec.h"
#include "object-file.h"
#include "object-store-ll.h"
#include "path.h"
#include "replace-object.h"
#include "tmp-objdir.h"
#include "chdir-notify.h"
#include "setup.h"
#include "shallow.h"
#include "trace.h"
#include "write-or-die.h"

int trust_executable_bit = 1;
int trust_ctime = 1;
int check_stat = 1;
int has_symlinks = 1;
int minimum_abbrev = 4, default_abbrev = -1;
int ignore_case;
int assume_unchanged;
int prefer_symlink_refs;
int is_bare_repository_cfg = -1; /* unspecified */
int warn_ambiguous_refs = 1;
int warn_on_object_refname_ambiguity = 1;
int repository_format_precious_objects;
const char *git_commit_encoding;
const char *git_log_output_encoding;
char *apply_default_whitespace;
char *apply_default_ignorewhitespace;
const char *git_attributes_file;
const char *git_hooks_path;
int zlib_compression_level = Z_BEST_SPEED;
int pack_compression_level = Z_DEFAULT_COMPRESSION;
int fsync_object_files = -1;
int use_fsync = -1;
enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT;
enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT;
size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
size_t delta_base_cache_limit = 96 * 1024 * 1024;
unsigned long big_file_threshold = 512 * 1024 * 1024;
const char *editor_program;
const char *askpass_program;
const char *excludes_file;
enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
enum eol core_eol = EOL_UNSET;
int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
const char *check_roundtrip_encoding = "SHIFT-JIS";
enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
#ifndef OBJECT_CREATION_MODE
#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
#endif
enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
char *notes_ref_name;
int grafts_keep_true_parents;
int core_apply_sparse_checkout;
int core_sparse_checkout_cone;
int sparse_expect_files_outside_of_patterns;
int merge_log_config = -1;
int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
unsigned long pack_size_limit_cfg;
enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;
int max_allowed_tree_depth =
#ifdef _MSC_VER
	/*
	 * When traversing into too-deep trees, Visual C-compiled Git seems to
	 * run into some internal stack overflow detection in the
	 * `RtlpAllocateHeap()` function that is called from within
	 * `git_inflate_init()`'s call tree. The following value seems to be
	 * low enough to avoid that by letting Git exit with an error before
	 * the stack overflow can occur.
	 */
	512;
#else
	2048;
#endif

#ifndef PROTECT_HFS_DEFAULT
#define PROTECT_HFS_DEFAULT 0
#endif
int protect_hfs = PROTECT_HFS_DEFAULT;

#ifndef PROTECT_NTFS_DEFAULT
#define PROTECT_NTFS_DEFAULT 1
#endif
int protect_ntfs = PROTECT_NTFS_DEFAULT;

/*
 * The character that begins a commented line in user-editable file
 * that is subject to stripspace.
 */
char comment_line_char = '#';
int auto_comment_line_char;

/* Parallel index stat data preload? */
int core_preload_index = 1;

/* This is set by setup_git_dir_gently() and/or git_default_config() */
char *git_work_tree_cfg;

static char *git_namespace;

/*
 * Repository-local GIT_* environment variables; see environment.h for details.
 */
const char * const local_repo_env[] = {
	ALTERNATE_DB_ENVIRONMENT,
	CONFIG_ENVIRONMENT,
	CONFIG_DATA_ENVIRONMENT,
	CONFIG_COUNT_ENVIRONMENT,
	DB_ENVIRONMENT,
	GIT_DIR_ENVIRONMENT,
	GIT_WORK_TREE_ENVIRONMENT,
	GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
	GRAFT_ENVIRONMENT,
	INDEX_ENVIRONMENT,
	NO_REPLACE_OBJECTS_ENVIRONMENT,
	GIT_REPLACE_REF_BASE_ENVIRONMENT,
	GIT_PREFIX_ENVIRONMENT,
	GIT_SHALLOW_FILE_ENVIRONMENT,
	GIT_COMMON_DIR_ENVIRONMENT,
	NULL
};

static char *expand_namespace(const char *raw_namespace)
{
	struct strbuf buf = STRBUF_INIT;
	struct strbuf **components, **c;

	if (!raw_namespace || !*raw_namespace)
		return xstrdup("");

	strbuf_addstr(&buf, raw_namespace);
	components = strbuf_split(&buf, '/');
	strbuf_reset(&buf);
	for (c = components; *c; c++)
		if (strcmp((*c)->buf, "/") != 0)
			strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
	strbuf_list_free(components);
	if (check_refname_format(buf.buf, 0))
		die(_("bad git namespace path \"%s\""), raw_namespace);
	strbuf_addch(&buf, '/');
	return strbuf_detach(&buf, NULL);
}

const char *getenv_safe(struct strvec *argv, const char *name)
{
	const char *value = getenv(name);

	if (!value)
		return NULL;

	strvec_push(argv, value);
	return argv->v[argv->nr - 1];
}

void setup_git_env(const char *git_dir)
{
	char *git_replace_ref_base;
	const char *shallow_file;
	const char *replace_ref_base;
	struct set_gitdir_args args = { NULL };
	struct strvec to_free = STRVEC_INIT;

	args.commondir = getenv_safe(&to_free, GIT_COMMON_DIR_ENVIRONMENT);
	args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);
	args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
	args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
	args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
	if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
		args.disable_ref_updates = 1;
	}

	repo_set_gitdir(the_repository, git_dir, &args);
	strvec_clear(&to_free);

	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
		disable_replace_refs();
	replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
	git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
							  : "refs/replace/");
	update_ref_namespace(NAMESPACE_REPLACE, git_replace_ref_base);

	free(git_namespace);
	git_namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
	shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
	if (shallow_file)
		set_alternate_shallow_file(the_repository, shallow_file, 0);

	if (git_env_bool(NO_LAZY_FETCH_ENVIRONMENT, 0))
		fetch_if_missing = 0;
}

int is_bare_repository(void)
{
	/* if core.bare is not 'false', let's see if there is a work tree */
	return is_bare_repository_cfg && !get_git_work_tree();
}

int have_git_dir(void)
{
	return startup_info->have_repository
		|| the_repository->gitdir;
}

const char *get_git_dir(void)
{
	if (!the_repository->gitdir)
		BUG("git environment hasn't been setup");
	return the_repository->gitdir;
}

const char *get_git_common_dir(void)
{
	if (!the_repository->commondir)
		BUG("git environment hasn't been setup");
	return the_repository->commondir;
}

const char *get_git_namespace(void)
{
	if (!git_namespace)
		BUG("git environment hasn't been setup");
	return git_namespace;
}

const char *strip_namespace(const char *namespaced_ref)
{
	const char *out;
	if (skip_prefix(namespaced_ref, get_git_namespace(), &out))
		return out;
	return NULL;
}

static int git_work_tree_initialized;

/*
 * Note.  This works only before you used a work tree.  This was added
 * primarily to support git-clone to work in a new repository it just
 * created, and is not meant to flip between different work trees.
 */
void set_git_work_tree(const char *new_work_tree)
{
	if (git_work_tree_initialized) {
		struct strbuf realpath = STRBUF_INIT;

		strbuf_realpath(&realpath, new_work_tree, 1);
		new_work_tree = realpath.buf;
		if (strcmp(new_work_tree, the_repository->worktree))
			die("internal error: work tree has already been set\n"
			    "Current worktree: %s\nNew worktree: %s",
			    the_repository->worktree, new_work_tree);
		strbuf_release(&realpath);
		return;
	}
	git_work_tree_initialized = 1;
	repo_set_worktree(the_repository, new_work_tree);
}

const char *get_git_work_tree(void)
{
	return the_repository->worktree;
}

const char *get_object_directory(void)
{
	if (!the_repository->objects->odb)
		BUG("git environment hasn't been setup");
	return the_repository->objects->odb->path;
}

int odb_mkstemp(struct strbuf *temp_filename, const char *pattern)
{
	int fd;
	/*
	 * we let the umask do its job, don't try to be more
	 * restrictive except to remove write permission.
	 */
	int mode = 0444;
	git_path_buf(temp_filename, "objects/%s", pattern);
	fd = git_mkstemp_mode(temp_filename->buf, mode);
	if (0 <= fd)
		return fd;

	/* slow path */
	/* some mkstemp implementations erase temp_filename on failure */
	git_path_buf(temp_filename, "objects/%s", pattern);
	safe_create_leading_directories(temp_filename->buf);
	return xmkstemp_mode(temp_filename->buf, mode);
}

int odb_pack_keep(const char *name)
{
	int fd;

	fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
	if (0 <= fd)
		return fd;

	/* slow path */
	safe_create_leading_directories_const(name);
	return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
}

char *get_index_file(void)
{
	if (!the_repository->index_file)
		BUG("git environment hasn't been setup");
	return the_repository->index_file;
}

char *get_graft_file(struct repository *r)
{
	if (!r->graft_file)
		BUG("git environment hasn't been setup");
	return r->graft_file;
}

static void set_git_dir_1(const char *path)
{
	xsetenv(GIT_DIR_ENVIRONMENT, path, 1);
	setup_git_env(path);
}

static void update_relative_gitdir(const char *name UNUSED,
				   const char *old_cwd,
				   const char *new_cwd,
				   void *data UNUSED)
{
	char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
	struct tmp_objdir *tmp_objdir = tmp_objdir_unapply_primary_odb();

	trace_printf_key(&trace_setup_key,
			 "setup: move $GIT_DIR to '%s'",
			 path);
	set_git_dir_1(path);
	if (tmp_objdir)
		tmp_objdir_reapply_primary_odb(tmp_objdir, old_cwd, new_cwd);
	free(path);
}

void set_git_dir(const char *path, int make_realpath)
{
	struct strbuf realpath = STRBUF_INIT;

	if (make_realpath) {
		strbuf_realpath(&realpath, path, 1);
		path = realpath.buf;
	}

	set_git_dir_1(path);
	if (!is_absolute_path(path))
		chdir_notify_register(NULL, update_relative_gitdir, NULL);

	strbuf_release(&realpath);
}

const char *get_log_output_encoding(void)
{
	return git_log_output_encoding ? git_log_output_encoding
		: get_commit_output_encoding();
}

const char *get_commit_output_encoding(void)
{
	return git_commit_encoding ? git_commit_encoding : "UTF-8";
}

static int the_shared_repository = PERM_UMASK;
static int need_shared_repository_from_config = 1;

void set_shared_repository(int value)
{
	the_shared_repository = value;
	need_shared_repository_from_config = 0;
}

int get_shared_repository(void)
{
	if (need_shared_repository_from_config) {
		const char *var = "core.sharedrepository";
		const char *value;
		if (!git_config_get_value(var, &value))
			the_shared_repository = git_config_perm(var, value);
		need_shared_repository_from_config = 0;
	}
	return the_shared_repository;
}

void reset_shared_repository(void)
{
	need_shared_repository_from_config = 1;
}

int use_optional_locks(void)
{
	return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);
}

int print_sha1_ellipsis(void)
{
	/*
	 * Determine if the calling environment contains the variable
	 * GIT_PRINT_SHA1_ELLIPSIS set to "yes".
	 */
	static int cached_result = -1; /* unknown */

	if (cached_result < 0) {
		const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");
		cached_result = (v && !strcasecmp(v, "yes"));
	}
	return cached_result;
}
Commit	Line	Data
	1	/*
	2	* We put all the git config variables in this same object
	3	* file, so that programs can link against the config parser
	4	* without having to link against all the rest of git.
	5	*
	6	* In particular, no need to bring in libz etc unless needed,
	7	* even if you might want to know where the git directory etc
	8	* are.
	9	*/
	10	#include "git-compat-util.h"
	11	#include "abspath.h"
	12	#include "branch.h"
	13	#include "convert.h"
	14	#include "environment.h"
	15	#include "gettext.h"
	16	#include "repository.h"
	17	#include "config.h"
	18	#include "refs.h"
	19	#include "fmt-merge-msg.h"
	20	#include "commit.h"
	21	#include "strvec.h"
	22	#include "object-file.h"
	23	#include "object-store-ll.h"
	24	#include "path.h"
	25	#include "replace-object.h"
	26	#include "tmp-objdir.h"
	27	#include "chdir-notify.h"
	28	#include "setup.h"
	29	#include "shallow.h"
	30	#include "trace.h"
	31	#include "write-or-die.h"
	32
	33	int trust_executable_bit = 1;
	34	int trust_ctime = 1;
	35	int check_stat = 1;
	36	int has_symlinks = 1;
	37	int minimum_abbrev = 4, default_abbrev = -1;
	38	int ignore_case;
	39	int assume_unchanged;
	40	int prefer_symlink_refs;
	41	int is_bare_repository_cfg = -1; /* unspecified */
	42	int warn_ambiguous_refs = 1;
	43	int warn_on_object_refname_ambiguity = 1;
	44	int repository_format_precious_objects;
	45	const char *git_commit_encoding;
	46	const char *git_log_output_encoding;
	47	char *apply_default_whitespace;
	48	char *apply_default_ignorewhitespace;
	49	const char *git_attributes_file;
	50	const char *git_hooks_path;
	51	int zlib_compression_level = Z_BEST_SPEED;
	52	int pack_compression_level = Z_DEFAULT_COMPRESSION;
	53	int fsync_object_files = -1;
	54	int use_fsync = -1;
	55	enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT;
	56	enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT;
	57	size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
	58	size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
	59	size_t delta_base_cache_limit = 96 * 1024 * 1024;
	60	unsigned long big_file_threshold = 512 * 1024 * 1024;
	61	const char *editor_program;
	62	const char *askpass_program;
	63	const char *excludes_file;
	64	enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
	65	enum eol core_eol = EOL_UNSET;
	66	int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
	67	const char *check_roundtrip_encoding = "SHIFT-JIS";
	68	enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
	69	enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
	70	enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
	71	#ifndef OBJECT_CREATION_MODE
	72	#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
	73	#endif
	74	enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
	75	char *notes_ref_name;
	76	int grafts_keep_true_parents;
	77	int core_apply_sparse_checkout;
	78	int core_sparse_checkout_cone;
	79	int sparse_expect_files_outside_of_patterns;
	80	int merge_log_config = -1;
	81	int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
	82	unsigned long pack_size_limit_cfg;
	83	enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;
	84	int max_allowed_tree_depth =
	85	#ifdef _MSC_VER
	86	/*
	87	* When traversing into too-deep trees, Visual C-compiled Git seems to
	88	* run into some internal stack overflow detection in the
	89	* `RtlpAllocateHeap()` function that is called from within
	90	* `git_inflate_init()`'s call tree. The following value seems to be
	91	* low enough to avoid that by letting Git exit with an error before
	92	* the stack overflow can occur.
	93	*/
	94	512;
	95	#else
	96	2048;
	97	#endif
	98
	99	#ifndef PROTECT_HFS_DEFAULT
	100	#define PROTECT_HFS_DEFAULT 0
	101	#endif
	102	int protect_hfs = PROTECT_HFS_DEFAULT;
	103
	104	#ifndef PROTECT_NTFS_DEFAULT
	105	#define PROTECT_NTFS_DEFAULT 1
	106	#endif
	107	int protect_ntfs = PROTECT_NTFS_DEFAULT;
	108
	109	/*
	110	* The character that begins a commented line in user-editable file
	111	* that is subject to stripspace.
	112	*/
	113	char comment_line_char = '#';
	114	int auto_comment_line_char;
	115
	116	/* Parallel index stat data preload? */
	117	int core_preload_index = 1;
	118
	119	/* This is set by setup_git_dir_gently() and/or git_default_config() */
	120	char *git_work_tree_cfg;
	121
	122	static char *git_namespace;
	123
	124	/*
	125	* Repository-local GIT_* environment variables; see environment.h for details.
	126	*/
	127	const char * const local_repo_env[] = {
	128	ALTERNATE_DB_ENVIRONMENT,
	129	CONFIG_ENVIRONMENT,
	130	CONFIG_DATA_ENVIRONMENT,
	131	CONFIG_COUNT_ENVIRONMENT,
	132	DB_ENVIRONMENT,
	133	GIT_DIR_ENVIRONMENT,
	134	GIT_WORK_TREE_ENVIRONMENT,
	135	GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
	136	GRAFT_ENVIRONMENT,
	137	INDEX_ENVIRONMENT,
	138	NO_REPLACE_OBJECTS_ENVIRONMENT,
	139	GIT_REPLACE_REF_BASE_ENVIRONMENT,
	140	GIT_PREFIX_ENVIRONMENT,
	141	GIT_SHALLOW_FILE_ENVIRONMENT,
	142	GIT_COMMON_DIR_ENVIRONMENT,
	143	NULL
	144	};
	145
	146	static char expand_namespace(const char raw_namespace)
	147	{
	148	struct strbuf buf = STRBUF_INIT;
	149	struct strbuf components, c;
	150
	151	if (!raw_namespace \|\| !*raw_namespace)
	152	return xstrdup("");
	153
	154	strbuf_addstr(&buf, raw_namespace);
	155	components = strbuf_split(&buf, '/');
	156	strbuf_reset(&buf);
	157	for (c = components; *c; c++)
	158	if (strcmp((*c)->buf, "/") != 0)
	159	strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
	160	strbuf_list_free(components);
	161	if (check_refname_format(buf.buf, 0))
	162	die(_("bad git namespace path \"%s\""), raw_namespace);
	163	strbuf_addch(&buf, '/');
	164	return strbuf_detach(&buf, NULL);
	165	}
	166
	167	const char getenv_safe(struct strvec argv, const char *name)
	168	{
	169	const char *value = getenv(name);
	170
	171	if (!value)
	172	return NULL;
	173
	174	strvec_push(argv, value);
	175	return argv->v[argv->nr - 1];
	176	}
	177
	178	void setup_git_env(const char *git_dir)
	179	{
	180	char *git_replace_ref_base;
	181	const char *shallow_file;
	182	const char *replace_ref_base;
	183	struct set_gitdir_args args = { NULL };
	184	struct strvec to_free = STRVEC_INIT;
	185
	186	args.commondir = getenv_safe(&to_free, GIT_COMMON_DIR_ENVIRONMENT);
	187	args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);
	188	args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
	189	args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
	190	args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
	191	if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
	192	args.disable_ref_updates = 1;
	193	}
	194
	195	repo_set_gitdir(the_repository, git_dir, &args);
	196	strvec_clear(&to_free);
	197
	198	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
	199	disable_replace_refs();
	200	replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
	201	git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
	202	: "refs/replace/");
	203	update_ref_namespace(NAMESPACE_REPLACE, git_replace_ref_base);
	204
	205	free(git_namespace);
	206	git_namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
	207	shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
	208	if (shallow_file)
	209	set_alternate_shallow_file(the_repository, shallow_file, 0);
	210
	211	if (git_env_bool(NO_LAZY_FETCH_ENVIRONMENT, 0))
	212	fetch_if_missing = 0;
	213	}
	214
	215	int is_bare_repository(void)
	216	{
	217	/* if core.bare is not 'false', let's see if there is a work tree */
	218	return is_bare_repository_cfg && !get_git_work_tree();
	219	}
	220
	221	int have_git_dir(void)
	222	{
	223	return startup_info->have_repository
	224	\|\| the_repository->gitdir;
	225	}
	226
	227	const char *get_git_dir(void)
	228	{
	229	if (!the_repository->gitdir)
	230	BUG("git environment hasn't been setup");
	231	return the_repository->gitdir;
	232	}
	233
	234	const char *get_git_common_dir(void)
	235	{
	236	if (!the_repository->commondir)
	237	BUG("git environment hasn't been setup");
	238	return the_repository->commondir;
	239	}
	240
	241	const char *get_git_namespace(void)
	242	{
	243	if (!git_namespace)
	244	BUG("git environment hasn't been setup");
	245	return git_namespace;
	246	}
	247
	248	const char strip_namespace(const char namespaced_ref)
	249	{
	250	const char *out;
	251	if (skip_prefix(namespaced_ref, get_git_namespace(), &out))
	252	return out;
	253	return NULL;
	254	}
	255
	256	static int git_work_tree_initialized;
	257
	258	/*
	259	* Note. This works only before you used a work tree. This was added
	260	* primarily to support git-clone to work in a new repository it just
	261	* created, and is not meant to flip between different work trees.
	262	*/
	263	void set_git_work_tree(const char *new_work_tree)
	264	{
	265	if (git_work_tree_initialized) {
	266	struct strbuf realpath = STRBUF_INIT;
	267
	268	strbuf_realpath(&realpath, new_work_tree, 1);
	269	new_work_tree = realpath.buf;
	270	if (strcmp(new_work_tree, the_repository->worktree))
	271	die("internal error: work tree has already been set\n"
	272	"Current worktree: %s\nNew worktree: %s",
	273	the_repository->worktree, new_work_tree);
	274	strbuf_release(&realpath);
	275	return;
	276	}
	277	git_work_tree_initialized = 1;
	278	repo_set_worktree(the_repository, new_work_tree);
	279	}
	280
	281	const char *get_git_work_tree(void)
	282	{
	283	return the_repository->worktree;
	284	}
	285
	286	const char *get_object_directory(void)
	287	{
	288	if (!the_repository->objects->odb)
	289	BUG("git environment hasn't been setup");
	290	return the_repository->objects->odb->path;
	291	}
	292
	293	int odb_mkstemp(struct strbuf temp_filename, const char pattern)
	294	{
	295	int fd;
	296	/*
	297	* we let the umask do its job, don't try to be more
	298	* restrictive except to remove write permission.
	299	*/
	300	int mode = 0444;
	301	git_path_buf(temp_filename, "objects/%s", pattern);
	302	fd = git_mkstemp_mode(temp_filename->buf, mode);
	303	if (0 <= fd)
	304	return fd;
	305
	306	/* slow path */
	307	/* some mkstemp implementations erase temp_filename on failure */
	308	git_path_buf(temp_filename, "objects/%s", pattern);
	309	safe_create_leading_directories(temp_filename->buf);
	310	return xmkstemp_mode(temp_filename->buf, mode);
	311	}
	312
	313	int odb_pack_keep(const char *name)
	314	{
	315	int fd;
	316
	317	fd = open(name, O_RDWR\|O_CREAT\|O_EXCL, 0600);
	318	if (0 <= fd)
	319	return fd;
	320
	321	/* slow path */
	322	safe_create_leading_directories_const(name);
	323	return open(name, O_RDWR\|O_CREAT\|O_EXCL, 0600);
	324	}
	325
	326	char *get_index_file(void)
	327	{
	328	if (!the_repository->index_file)
	329	BUG("git environment hasn't been setup");
	330	return the_repository->index_file;
	331	}
	332
	333	char get_graft_file(struct repository r)
	334	{
	335	if (!r->graft_file)
	336	BUG("git environment hasn't been setup");
	337	return r->graft_file;
	338	}
	339
	340	static void set_git_dir_1(const char *path)
	341	{
	342	xsetenv(GIT_DIR_ENVIRONMENT, path, 1);
	343	setup_git_env(path);
	344	}
	345
	346	static void update_relative_gitdir(const char *name UNUSED,
	347	const char *old_cwd,
	348	const char *new_cwd,
	349	void *data UNUSED)
	350	{
	351	char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
	352	struct tmp_objdir *tmp_objdir = tmp_objdir_unapply_primary_odb();
	353
	354	trace_printf_key(&trace_setup_key,
	355	"setup: move $GIT_DIR to '%s'",
	356	path);
	357	set_git_dir_1(path);
	358	if (tmp_objdir)
	359	tmp_objdir_reapply_primary_odb(tmp_objdir, old_cwd, new_cwd);
	360	free(path);
	361	}
	362
	363	void set_git_dir(const char *path, int make_realpath)
	364	{
	365	struct strbuf realpath = STRBUF_INIT;
	366
	367	if (make_realpath) {
	368	strbuf_realpath(&realpath, path, 1);
	369	path = realpath.buf;
	370	}
	371
	372	set_git_dir_1(path);
	373	if (!is_absolute_path(path))
	374	chdir_notify_register(NULL, update_relative_gitdir, NULL);
	375
	376	strbuf_release(&realpath);
	377	}
	378
	379	const char *get_log_output_encoding(void)
	380	{
	381	return git_log_output_encoding ? git_log_output_encoding
	382	: get_commit_output_encoding();
	383	}
	384
	385	const char *get_commit_output_encoding(void)
	386	{
	387	return git_commit_encoding ? git_commit_encoding : "UTF-8";
	388	}
	389
	390	static int the_shared_repository = PERM_UMASK;
	391	static int need_shared_repository_from_config = 1;
	392
	393	void set_shared_repository(int value)
	394	{
	395	the_shared_repository = value;
	396	need_shared_repository_from_config = 0;
	397	}
	398
	399	int get_shared_repository(void)
	400	{
	401	if (need_shared_repository_from_config) {
	402	const char *var = "core.sharedrepository";
	403	const char *value;
	404	if (!git_config_get_value(var, &value))
	405	the_shared_repository = git_config_perm(var, value);
	406	need_shared_repository_from_config = 0;
	407	}
	408	return the_shared_repository;
	409	}
	410
	411	void reset_shared_repository(void)
	412	{
	413	need_shared_repository_from_config = 1;
	414	}
	415
	416	int use_optional_locks(void)
	417	{
	418	return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);
	419	}
	420
	421	int print_sha1_ellipsis(void)
	422	{
	423	/*
	424	* Determine if the calling environment contains the variable
	425	* GIT_PRINT_SHA1_ELLIPSIS set to "yes".
	426	*/
	427	static int cached_result = -1; /* unknown */
	428
	429	if (cached_result < 0) {
	430	const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");
	431	cached_result = (v && !strcasecmp(v, "yes"));
	432	}
	433	return cached_result;
	434	}