environment.c - 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 "refs.h"
 #include "fmt-merge-msg.h"
 #include "commit.h"

 int trust_executable_bit = 1;
 int trust_ctime = 1;
 int check_stat = 1;
 int has_symlinks = 1;
 int minimum_abbrev = 4, default_abbrev = 7;
 int ignore_case;
 int assume_unchanged;
 int prefer_symlink_refs;
 int is_bare_repository_cfg = -1; /* unspecified */
 int log_all_ref_updates = -1; /* unspecified */
 int warn_ambiguous_refs = 1;
 int warn_on_object_refname_ambiguity = 1;
 int repository_format_version;
 const char *git_commit_encoding;
 const char *git_log_output_encoding;
 int shared_repository = PERM_UMASK;
 const char *apply_default_whitespace;
 const char *apply_default_ignorewhitespace;
 const char *git_attributes_file;
 int zlib_compression_level = Z_BEST_SPEED;
 int core_compression_level;
 int core_compression_seen;
 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;
 const char *pager_program;
 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 check_replace_refs = 1;
 enum eol core_eol = EOL_UNSET;
 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
 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 merge_log_config = -1;
 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
 struct startup_info *startup_info;
 unsigned long pack_size_limit_cfg;

 /*
  * 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 *work_tree;

 static const char *namespace;
 static size_t namespace_len;

 static const char *git_dir, *git_common_dir;
 static char *git_object_dir, *git_index_file, *git_graft_file;
 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;

 /*
  * 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_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);
 }

 static char *git_path_from_env(const char *envvar, const char *git_dir,
 			       const char *path, int *fromenv)
 {
 	const char *value = getenv(envvar);
 	if (!value) {
 		char *buf = xmalloc(strlen(git_dir) + strlen(path) + 2);
 		sprintf(buf, "%s/%s", git_dir, path);
 		return buf;
 	}
 	if (fromenv)
 		*fromenv = 1;
 	return xstrdup(value);
 }

 static void setup_git_env(void)
 {
 	struct strbuf sb = STRBUF_INIT;
 	const char *gitfile;
 	const char *shallow_file;

 	git_dir = getenv(GIT_DIR_ENVIRONMENT);
 	if (!git_dir)
 		git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 	gitfile = read_gitfile(git_dir);
 	git_dir = xstrdup(gitfile ? gitfile : git_dir);
 	if (get_common_dir(&sb, git_dir))
 		git_common_dir_env = 1;
 	git_common_dir = strbuf_detach(&sb, NULL);
 	git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 					   "objects", &git_db_env);
 	git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 					   "index", &git_index_env);
 	git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 					   "info/grafts", &git_graft_env);
 	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 		check_replace_refs = 0;
 	namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 	namespace_len = strlen(namespace);
 	shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 	if (shallow_file)
 		set_alternate_shallow_file(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();
 }

 const char *get_git_dir(void)
 {
 	if (!git_dir)
 		setup_git_env();
 	return git_dir;
 }

 const char *get_git_common_dir(void)
 {
 	return git_common_dir;
 }

 const char *get_git_namespace(void)
 {
 	if (!namespace)
 		setup_git_env();
 	return namespace;
 }

 const char *strip_namespace(const char *namespaced_ref)
 {
 	if (!starts_with(namespaced_ref, get_git_namespace()))
 		return NULL;
 	return namespaced_ref + namespace_len;
 }

 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) {
 		new_work_tree = real_path(new_work_tree);
 		if (strcmp(new_work_tree, work_tree))
 			die("internal error: work tree has already been set\n"
 			    "Current worktree: %s\nNew worktree: %s",
 			    work_tree, new_work_tree);
 		return;
 	}
 	git_work_tree_initialized = 1;
 	work_tree = xstrdup(real_path(new_work_tree));
 }

 const char *get_git_work_tree(void)
 {
 	return work_tree;
 }

 char *get_object_directory(void)
 {
 	if (!git_object_dir)
 		setup_git_env();
 	return git_object_dir;
 }

 int odb_mkstemp(char *template, size_t limit, 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;
 	snprintf(template, limit, "%s/%s",
 		 get_object_directory(), pattern);
 	fd = git_mkstemp_mode(template, mode);
 	if (0 <= fd)
 		return fd;

 	/* slow path */
 	/* some mkstemp implementations erase template on failure */
 	snprintf(template, limit, "%s/%s",
 		 get_object_directory(), pattern);
 	safe_create_leading_directories(template);
 	return xmkstemp_mode(template, mode);
 }

 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 {
 	int fd;

 	snprintf(name, namesz, "%s/pack/pack-%s.keep",
 		 get_object_directory(), sha1_to_hex(sha1));
 	fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 	if (0 <= fd)
 		return fd;

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

 char *get_index_file(void)
 {
 	if (!git_index_file)
 		setup_git_env();
 	return git_index_file;
 }

 char *get_graft_file(void)
 {
 	if (!git_graft_file)
 		setup_git_env();
 	return git_graft_file;
 }

 int set_git_dir(const char *path)
 {
 	if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 		return error("Could not set GIT_DIR to '%s'", path);
 	setup_git_env();
 	return 0;
 }

 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";
 }
	/*
	* 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 "refs.h"
	#include "fmt-merge-msg.h"
	#include "commit.h"

	int trust_executable_bit = 1;
	int trust_ctime = 1;
	int check_stat = 1;
	int has_symlinks = 1;
	int minimum_abbrev = 4, default_abbrev = 7;
	int ignore_case;
	int assume_unchanged;
	int prefer_symlink_refs;
	int is_bare_repository_cfg = -1; /* unspecified */
	int log_all_ref_updates = -1; /* unspecified */
	int warn_ambiguous_refs = 1;
	int warn_on_object_refname_ambiguity = 1;
	int repository_format_version;
	const char *git_commit_encoding;
	const char *git_log_output_encoding;
	int shared_repository = PERM_UMASK;
	const char *apply_default_whitespace;
	const char *apply_default_ignorewhitespace;
	const char *git_attributes_file;
	int zlib_compression_level = Z_BEST_SPEED;
	int core_compression_level;
	int core_compression_seen;
	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;
	const char *pager_program;
	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 check_replace_refs = 1;
	enum eol core_eol = EOL_UNSET;
	enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
	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 merge_log_config = -1;
	int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
	struct startup_info *startup_info;
	unsigned long pack_size_limit_cfg;

	/*
	* 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 *work_tree;

	static const char *namespace;
	static size_t namespace_len;

	static const char git_dir, git_common_dir;
	static char git_object_dir, git_index_file, *git_graft_file;
	int git_db_env, git_index_env, git_graft_env, git_common_dir_env;

	/*
	* 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_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);
	}

	static char git_path_from_env(const char envvar, const char *git_dir,
	const char path, int fromenv)
	{
	const char *value = getenv(envvar);
	if (!value) {
	char *buf = xmalloc(strlen(git_dir) + strlen(path) + 2);
	sprintf(buf, "%s/%s", git_dir, path);
	return buf;
	}
	if (fromenv)
	*fromenv = 1;
	return xstrdup(value);
	}

	static void setup_git_env(void)
	{
	struct strbuf sb = STRBUF_INIT;
	const char *gitfile;
	const char *shallow_file;

	git_dir = getenv(GIT_DIR_ENVIRONMENT);
	if (!git_dir)
	git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
	gitfile = read_gitfile(git_dir);
	git_dir = xstrdup(gitfile ? gitfile : git_dir);
	if (get_common_dir(&sb, git_dir))
	git_common_dir_env = 1;
	git_common_dir = strbuf_detach(&sb, NULL);
	git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
	"objects", &git_db_env);
	git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
	"index", &git_index_env);
	git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
	"info/grafts", &git_graft_env);
	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
	check_replace_refs = 0;
	namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
	namespace_len = strlen(namespace);
	shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
	if (shallow_file)
	set_alternate_shallow_file(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();
	}

	const char *get_git_dir(void)
	{
	if (!git_dir)
	setup_git_env();
	return git_dir;
	}

	const char *get_git_common_dir(void)
	{
	return git_common_dir;
	}

	const char *get_git_namespace(void)
	{
	if (!namespace)
	setup_git_env();
	return namespace;
	}

	const char strip_namespace(const char namespaced_ref)
	{
	if (!starts_with(namespaced_ref, get_git_namespace()))
	return NULL;
	return namespaced_ref + namespace_len;
	}

	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) {
	new_work_tree = real_path(new_work_tree);
	if (strcmp(new_work_tree, work_tree))
	die("internal error: work tree has already been set\n"
	"Current worktree: %s\nNew worktree: %s",
	work_tree, new_work_tree);
	return;
	}
	git_work_tree_initialized = 1;
	work_tree = xstrdup(real_path(new_work_tree));
	}

	const char *get_git_work_tree(void)
	{
	return work_tree;
	}

	char *get_object_directory(void)
	{
	if (!git_object_dir)
	setup_git_env();
	return git_object_dir;
	}

	int odb_mkstemp(char template, size_t limit, 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;
	snprintf(template, limit, "%s/%s",
	get_object_directory(), pattern);
	fd = git_mkstemp_mode(template, mode);
	if (0 <= fd)
	return fd;

	/* slow path */
	/* some mkstemp implementations erase template on failure */
	snprintf(template, limit, "%s/%s",
	get_object_directory(), pattern);
	safe_create_leading_directories(template);
	return xmkstemp_mode(template, mode);
	}

	int odb_pack_keep(char name, size_t namesz, const unsigned char sha1)
	{
	int fd;

	snprintf(name, namesz, "%s/pack/pack-%s.keep",
	get_object_directory(), sha1_to_hex(sha1));
	fd = open(name, O_RDWR\|O_CREAT\|O_EXCL, 0600);
	if (0 <= fd)
	return fd;

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

	char *get_index_file(void)
	{
	if (!git_index_file)
	setup_git_env();
	return git_index_file;
	}

	char *get_graft_file(void)
	{
	if (!git_graft_file)
	setup_git_env();
	return git_graft_file;
	}

	int set_git_dir(const char *path)
	{
	if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
	return error("Could not set GIT_DIR to '%s'", path);
	setup_git_env();
	return 0;
	}

	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";
	}