environment.c - external/github.com/git/git - Git at Google

 /*
  * 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 "cache.h"
 #include "branch.h"
 #include "repository.h"
 #include "config.h"
 #include "refs.h"
 #include "fmt-merge-msg.h"
 #include "commit.h"
 #include "argv-array.h"
 #include "object-store.h"
 #include "chdir-notify.h"
 #include "shallow.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 ref_paranoia = -1;
 int repository_format_precious_objects;
 int repository_format_worktree_config;
 const char *git_commit_encoding;
 const char *git_log_output_encoding;
 const char *apply_default_whitespace;
 const char *apply_default_ignorewhitespace;
 const char *git_attributes_file;
 const char *git_hooks_path;
 int zlib_compression_level = Z_BEST_SPEED;
 int core_compression_level;
 int pack_compression_level = Z_DEFAULT_COMPRESSION;
 int fsync_object_files;
 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;
 int pager_use_color = 1;
 const char *editor_program;
 const char *askpass_program;
 const char *excludes_file;
 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
 int read_replace_refs = 1;
 char *git_replace_ref_base;
 enum eol core_eol = EOL_UNSET;
 int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
 char *check_roundtrip_encoding = "SHIFT-JIS";
 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
 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_replace_parents = 1;
 int core_apply_sparse_checkout;
 int core_sparse_checkout_cone;
 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;

 #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;
 const char *core_fsmonitor;

 /*
  * 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 a hack for test programs like test-dump-untracked-cache to
  * ensure that they do not modify the untracked cache when reading it.
  * Do not use it otherwise!
  */
 int ignore_untracked_cache_config;

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

 static char *git_namespace;

 static char *super_prefix;

 /*
  * Repository-local GIT_* environment variables; see cache.h for details.
  */
 const char * const local_repo_env[] = {
 	ALTERNATE_DB_ENVIRONMENT,
 	CONFIG_ENVIRONMENT,
 	CONFIG_DATA_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_SUPER_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);
 }

 /*
  * Wrapper of getenv() that returns a strdup value. This value is kept
  * in argv to be freed later.
  */
 static const char *getenv_safe(struct argv_array *argv, const char *name)
 {
 	const char *value = getenv(name);

 	if (!value)
 		return NULL;

 	argv_array_push(argv, value);
 	return argv->argv[argv->argc - 1];
 }

 void setup_git_env(const char *git_dir)
 {
 	const char *shallow_file;
 	const char *replace_ref_base;
 	struct set_gitdir_args args = { NULL };
 	struct argv_array to_free = ARGV_ARRAY_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);
 	repo_set_gitdir(the_repository, git_dir, &args);
 	argv_array_clear(&to_free);

 	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 		read_replace_refs = 0;
 	replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
 	free(git_replace_ref_base);
 	git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
 							  : "refs/replace/");
 	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);
 }

 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;
 }

 const char *get_super_prefix(void)
 {
 	static int initialized;
 	if (!initialized) {
 		super_prefix = xstrdup_or_null(getenv(GIT_SUPER_PREFIX_ENVIRONMENT));
 		initialized = 1;
 	}
 	return super_prefix;
 }

 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)
 {
 	struct strbuf realpath = STRBUF_INIT;

 	if (git_work_tree_initialized) {
 		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);
 		return;
 	}
 	git_work_tree_initialized = 1;
 	repo_set_worktree(the_repository, new_work_tree);

 	strbuf_release(&realpath);
 }

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

 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)
 {
 	if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 		die(_("could not set GIT_DIR to '%s'"), path);
 	setup_git_env(path);
 }

 static void update_relative_gitdir(const char *name,
 				   const char *old_cwd,
 				   const char *new_cwd,
 				   void *data)
 {
 	char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
 	trace_printf_key(&trace_setup_key,
 			 "setup: move $GIT_DIR to '%s'",
 			 path);
 	set_git_dir_1(path);
 	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;
 }
	/*
	* 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 "cache.h"
	#include "branch.h"
	#include "repository.h"
	#include "config.h"
	#include "refs.h"
	#include "fmt-merge-msg.h"
	#include "commit.h"
	#include "argv-array.h"
	#include "object-store.h"
	#include "chdir-notify.h"
	#include "shallow.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 ref_paranoia = -1;
	int repository_format_precious_objects;
	int repository_format_worktree_config;
	const char *git_commit_encoding;
	const char *git_log_output_encoding;
	const char *apply_default_whitespace;
	const char *apply_default_ignorewhitespace;
	const char *git_attributes_file;
	const char *git_hooks_path;
	int zlib_compression_level = Z_BEST_SPEED;
	int core_compression_level;
	int pack_compression_level = Z_DEFAULT_COMPRESSION;
	int fsync_object_files;
	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;
	int pager_use_color = 1;
	const char *editor_program;
	const char *askpass_program;
	const char *excludes_file;
	enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
	int read_replace_refs = 1;
	char *git_replace_ref_base;
	enum eol core_eol = EOL_UNSET;
	int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
	char *check_roundtrip_encoding = "SHIFT-JIS";
	unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
	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_replace_parents = 1;
	int core_apply_sparse_checkout;
	int core_sparse_checkout_cone;
	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;

	#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;
	const char *core_fsmonitor;

	/*
	* 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 a hack for test programs like test-dump-untracked-cache to
	* ensure that they do not modify the untracked cache when reading it.
	* Do not use it otherwise!
	*/
	int ignore_untracked_cache_config;

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

	static char *git_namespace;

	static char *super_prefix;

	/*
	* Repository-local GIT_* environment variables; see cache.h for details.
	*/
	const char * const local_repo_env[] = {
	ALTERNATE_DB_ENVIRONMENT,
	CONFIG_ENVIRONMENT,
	CONFIG_DATA_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_SUPER_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);
	}

	/*
	* Wrapper of getenv() that returns a strdup value. This value is kept
	* in argv to be freed later.
	*/
	static const char getenv_safe(struct argv_array argv, const char *name)
	{
	const char *value = getenv(name);

	if (!value)
	return NULL;

	argv_array_push(argv, value);
	return argv->argv[argv->argc - 1];
	}

	void setup_git_env(const char *git_dir)
	{
	const char *shallow_file;
	const char *replace_ref_base;
	struct set_gitdir_args args = { NULL };
	struct argv_array to_free = ARGV_ARRAY_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);
	repo_set_gitdir(the_repository, git_dir, &args);
	argv_array_clear(&to_free);

	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
	read_replace_refs = 0;
	replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
	free(git_replace_ref_base);
	git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
	: "refs/replace/");
	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);
	}

	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;
	}

	const char *get_super_prefix(void)
	{
	static int initialized;
	if (!initialized) {
	super_prefix = xstrdup_or_null(getenv(GIT_SUPER_PREFIX_ENVIRONMENT));
	initialized = 1;
	}
	return super_prefix;
	}

	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)
	{
	struct strbuf realpath = STRBUF_INIT;

	if (git_work_tree_initialized) {
	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);
	return;
	}
	git_work_tree_initialized = 1;
	repo_set_worktree(the_repository, new_work_tree);

	strbuf_release(&realpath);
	}

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

	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)
	{
	if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
	die(_("could not set GIT_DIR to '%s'"), path);
	setup_git_env(path);
	}

	static void update_relative_gitdir(const char *name,
	const char *old_cwd,
	const char *new_cwd,
	void *data)
	{
	char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
	trace_printf_key(&trace_setup_key,
	"setup: move $GIT_DIR to '%s'",
	path);
	set_git_dir_1(path);
	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;
	}