Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 411 insertions, 0 deletions

diff --git a/environment.c b/environment.c
new file mode 100644
index 000000000000..89af47cb8504
--- /dev/null
+++ b/environment.c
@@ -0,0 +1,411 @@
+/*
+ * 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"
+
+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;
+char *repository_format_partial_clone;
+const char *core_partial_clone_filter_default;
+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 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 0
+#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)
+{
+	if (git_work_tree_initialized) {
+		new_work_tree = real_path(new_work_tree);
+		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);
+}
+
+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)
+{
+	set_git_dir_1(path);
+	if (!is_absolute_path(path))
+		chdir_notify_register(NULL, update_relative_gitdir, 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;
+}