environment.c - jrn/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.
  */

 #define USE_THE_REPOSITORY_VARIABLE

 #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 "path.h"
 #include "chdir-notify.h"
 #include "setup.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 is_bare_repository_cfg = -1; /* unspecified */
 int warn_on_object_refname_ambiguity = 1;
 int repository_format_precious_objects;
 char *git_commit_encoding;
 char *git_log_output_encoding;
 char *apply_default_whitespace;
 char *apply_default_ignorewhitespace;
 char *git_attributes_file;
 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;
 char *editor_program;
 char *askpass_program;
 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;
 char *check_roundtrip_encoding;
 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;
 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;
 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.
  */
 const char *comment_line_str = "#";
 char *comment_line_str_to_free;
 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;

 /*
  * 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
 };

 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];
 }

 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 && !repo_get_work_tree(the_repository);
 }

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

 const char *get_git_namespace(void)
 {
 	static const char *namespace;

 	struct strbuf buf = STRBUF_INIT;
 	struct strbuf **components, **c;
 	const char *raw_namespace;

 	if (namespace)
 		return namespace;

 	raw_namespace = getenv(GIT_NAMESPACE_ENVIRONMENT);
 	if (!raw_namespace || !*raw_namespace) {
 		namespace = "";
 		return namespace;
 	}

 	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, '/');

 	namespace = strbuf_detach(&buf, NULL);

 	return 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_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.
	*/

	#define USE_THE_REPOSITORY_VARIABLE

	#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 "path.h"
	#include "chdir-notify.h"
	#include "setup.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 is_bare_repository_cfg = -1; /* unspecified */
	int warn_on_object_refname_ambiguity = 1;
	int repository_format_precious_objects;
	char *git_commit_encoding;
	char *git_log_output_encoding;
	char *apply_default_whitespace;
	char *apply_default_ignorewhitespace;
	char *git_attributes_file;
	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;
	char *editor_program;
	char *askpass_program;
	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;
	char *check_roundtrip_encoding;
	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;
	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;
	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.
	*/
	const char *comment_line_str = "#";
	char *comment_line_str_to_free;
	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;

	/*
	* 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
	};

	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];
	}

	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 && !repo_get_work_tree(the_repository);
	}

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

	const char *get_git_namespace(void)
	{
	static const char *namespace;

	struct strbuf buf = STRBUF_INIT;
	struct strbuf components, c;
	const char *raw_namespace;

	if (namespace)
	return namespace;

	raw_namespace = getenv(GIT_NAMESPACE_ENVIRONMENT);
	if (!raw_namespace \|\| !*raw_namespace) {
	namespace = "";
	return namespace;
	}

	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, '/');

	namespace = strbuf_detach(&buf, NULL);

	return 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_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;
	}