Move 'builtin-*' into a 'builtin/' subdirectory

This shrinks the top-level directory a bit, and makes it much more
pleasant to use auto-completion on the thing. Instead of

	[torvalds@nehalem git]$ em buil<tab>
	Display all 180 possibilities? (y or n)
	[torvalds@nehalem git]$ em builtin-sh
	builtin-shortlog.c     builtin-show-branch.c  builtin-show-ref.c
	builtin-shortlog.o     builtin-show-branch.o  builtin-show-ref.o
	[torvalds@nehalem git]$ em builtin-shor<tab>
	builtin-shortlog.c  builtin-shortlog.o
	[torvalds@nehalem git]$ em builtin-shortlog.c

you get

	[torvalds@nehalem git]$ em buil<tab>		[type]
	builtin/   builtin.h
	[torvalds@nehalem git]$ em builtin		[auto-completes to]
	[torvalds@nehalem git]$ em builtin/sh<tab>	[type]
	shortlog.c     shortlog.o     show-branch.c  show-branch.o  show-ref.c     show-ref.o
	[torvalds@nehalem git]$ em builtin/sho		[auto-completes to]
	[torvalds@nehalem git]$ em builtin/shor<tab>	[type]
	shortlog.c  shortlog.o
	[torvalds@nehalem git]$ em builtin/shortlog.c

which doesn't seem all that different, but not having that annoying
break in "Display all 180 possibilities?" is quite a relief.

NOTE! If you do this in a clean tree (no object files etc), or using an
editor that has auto-completion rules that ignores '*.o' files, you
won't see that annoying 'Display all 180 possibilities?' message - it
will just show the choices instead.  I think bash has some cut-off
around 100 choices or something.

So the reason I see this is that I'm using an odd editory, and thus
don't have the rules to cut down on auto-completion.  But you can
simulate that by using 'ls' instead, or something similar.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 498 insertions, 0 deletions

diff --git a/builtin/init-db.c b/builtin/init-db.c
new file mode 100644
index 0000000000..dd84caecbc
--- /dev/null
+++ b/builtin/init-db.c
@@ -0,0 +1,498 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "cache.h"
+#include "builtin.h"
+#include "exec_cmd.h"
+#include "parse-options.h"
+
+#ifndef DEFAULT_GIT_TEMPLATE_DIR
+#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
+#endif
+
+#ifdef NO_TRUSTABLE_FILEMODE
+#define TEST_FILEMODE 0
+#else
+#define TEST_FILEMODE 1
+#endif
+
+static int init_is_bare_repository = 0;
+static int init_shared_repository = -1;
+
+static void safe_create_dir(const char *dir, int share)
+{
+	if (mkdir(dir, 0777) < 0) {
+		if (errno != EEXIST) {
+			perror(dir);
+			exit(1);
+		}
+	}
+	else if (share && adjust_shared_perm(dir))
+		die("Could not make %s writable by group", dir);
+}
+
+static void copy_templates_1(char *path, int baselen,
+			     char *template, int template_baselen,
+			     DIR *dir)
+{
+	struct dirent *de;
+
+	/* Note: if ".git/hooks" file exists in the repository being
+	 * re-initialized, /etc/core-git/templates/hooks/update would
+	 * cause "git init" to fail here.  I think this is sane but
+	 * it means that the set of templates we ship by default, along
+	 * with the way the namespace under .git/ is organized, should
+	 * be really carefully chosen.
+	 */
+	safe_create_dir(path, 1);
+	while ((de = readdir(dir)) != NULL) {
+		struct stat st_git, st_template;
+		int namelen;
+		int exists = 0;
+
+		if (de->d_name[0] == '.')
+			continue;
+		namelen = strlen(de->d_name);
+		if ((PATH_MAX <= baselen + namelen) ||
+		    (PATH_MAX <= template_baselen + namelen))
+			die("insanely long template name %s", de->d_name);
+		memcpy(path + baselen, de->d_name, namelen+1);
+		memcpy(template + template_baselen, de->d_name, namelen+1);
+		if (lstat(path, &st_git)) {
+			if (errno != ENOENT)
+				die_errno("cannot stat '%s'", path);
+		}
+		else
+			exists = 1;
+
+		if (lstat(template, &st_template))
+			die_errno("cannot stat template '%s'", template);
+
+		if (S_ISDIR(st_template.st_mode)) {
+			DIR *subdir = opendir(template);
+			int baselen_sub = baselen + namelen;
+			int template_baselen_sub = template_baselen + namelen;
+			if (!subdir)
+				die_errno("cannot opendir '%s'", template);
+			path[baselen_sub++] =
+				template[template_baselen_sub++] = '/';
+			path[baselen_sub] =
+				template[template_baselen_sub] = 0;
+			copy_templates_1(path, baselen_sub,
+					 template, template_baselen_sub,
+					 subdir);
+			closedir(subdir);
+		}
+		else if (exists)
+			continue;
+		else if (S_ISLNK(st_template.st_mode)) {
+			char lnk[256];
+			int len;
+			len = readlink(template, lnk, sizeof(lnk));
+			if (len < 0)
+				die_errno("cannot readlink '%s'", template);
+			if (sizeof(lnk) <= len)
+				die("insanely long symlink %s", template);
+			lnk[len] = 0;
+			if (symlink(lnk, path))
+				die_errno("cannot symlink '%s' '%s'", lnk, path);
+		}
+		else if (S_ISREG(st_template.st_mode)) {
+			if (copy_file(path, template, st_template.st_mode))
+				die_errno("cannot copy '%s' to '%s'", template,
+					  path);
+		}
+		else
+			error("ignoring template %s", template);
+	}
+}
+
+static void copy_templates(const char *template_dir)
+{
+	char path[PATH_MAX];
+	char template_path[PATH_MAX];
+	int template_len;
+	DIR *dir;
+	const char *git_dir = get_git_dir();
+	int len = strlen(git_dir);
+
+	if (!template_dir)
+		template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
+	if (!template_dir)
+		template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
+	if (!template_dir[0])
+		return;
+	template_len = strlen(template_dir);
+	if (PATH_MAX <= (template_len+strlen("/config")))
+		die("insanely long template path %s", template_dir);
+	strcpy(template_path, template_dir);
+	if (template_path[template_len-1] != '/') {
+		template_path[template_len++] = '/';
+		template_path[template_len] = 0;
+	}
+	dir = opendir(template_path);
+	if (!dir) {
+		warning("templates not found %s", template_dir);
+		return;
+	}
+
+	/* Make sure that template is from the correct vintage */
+	strcpy(template_path + template_len, "config");
+	repository_format_version = 0;
+	git_config_from_file(check_repository_format_version,
+			     template_path, NULL);
+	template_path[template_len] = 0;
+
+	if (repository_format_version &&
+	    repository_format_version != GIT_REPO_VERSION) {
+		warning("not copying templates of "
+			"a wrong format version %d from '%s'",
+			repository_format_version,
+			template_dir);
+		closedir(dir);
+		return;
+	}
+
+	memcpy(path, git_dir, len);
+	if (len && path[len - 1] != '/')
+		path[len++] = '/';
+	path[len] = 0;
+	copy_templates_1(path, len,
+			 template_path, template_len,
+			 dir);
+	closedir(dir);
+}
+
+static int create_default_files(const char *template_path)
+{
+	const char *git_dir = get_git_dir();
+	unsigned len = strlen(git_dir);
+	static char path[PATH_MAX];
+	struct stat st1;
+	char repo_version_string[10];
+	char junk[2];
+	int reinit;
+	int filemode;
+
+	if (len > sizeof(path)-50)
+		die("insane git directory %s", git_dir);
+	memcpy(path, git_dir, len);
+
+	if (len && path[len-1] != '/')
+		path[len++] = '/';
+
+	/*
+	 * Create .git/refs/{heads,tags}
+	 */
+	safe_create_dir(git_path("refs"), 1);
+	safe_create_dir(git_path("refs/heads"), 1);
+	safe_create_dir(git_path("refs/tags"), 1);
+
+	/* First copy the templates -- we might have the default
+	 * config file there, in which case we would want to read
+	 * from it after installing.
+	 */
+	copy_templates(template_path);
+
+	git_config(git_default_config, NULL);
+	is_bare_repository_cfg = init_is_bare_repository;
+
+	/* reading existing config may have overwrote it */
+	if (init_shared_repository != -1)
+		shared_repository = init_shared_repository;
+
+	/*
+	 * We would have created the above under user's umask -- under
+	 * shared-repository settings, we would need to fix them up.
+	 */
+	if (shared_repository) {
+		adjust_shared_perm(get_git_dir());
+		adjust_shared_perm(git_path("refs"));
+		adjust_shared_perm(git_path("refs/heads"));
+		adjust_shared_perm(git_path("refs/tags"));
+	}
+
+	/*
+	 * Create the default symlink from ".git/HEAD" to the "master"
+	 * branch, if it does not exist yet.
+	 */
+	strcpy(path + len, "HEAD");
+	reinit = (!access(path, R_OK)
+		  || readlink(path, junk, sizeof(junk)-1) != -1);
+	if (!reinit) {
+		if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
+			exit(1);
+	}
+
+	/* This forces creation of new config file */
+	sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
+	git_config_set("core.repositoryformatversion", repo_version_string);
+
+	path[len] = 0;
+	strcpy(path + len, "config");
+
+	/* Check filemode trustability */
+	filemode = TEST_FILEMODE;
+	if (TEST_FILEMODE && !lstat(path, &st1)) {
+		struct stat st2;
+		filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
+				!lstat(path, &st2) &&
+				st1.st_mode != st2.st_mode);
+	}
+	git_config_set("core.filemode", filemode ? "true" : "false");
+
+	if (is_bare_repository())
+		git_config_set("core.bare", "true");
+	else {
+		const char *work_tree = get_git_work_tree();
+		git_config_set("core.bare", "false");
+		/* allow template config file to override the default */
+		if (log_all_ref_updates == -1)
+		    git_config_set("core.logallrefupdates", "true");
+		if (prefixcmp(git_dir, work_tree) ||
+		    strcmp(git_dir + strlen(work_tree), "/.git")) {
+			git_config_set("core.worktree", work_tree);
+		}
+	}
+
+	if (!reinit) {
+		/* Check if symlink is supported in the work tree */
+		path[len] = 0;
+		strcpy(path + len, "tXXXXXX");
+		if (!close(xmkstemp(path)) &&
+		    !unlink(path) &&
+		    !symlink("testing", path) &&
+		    !lstat(path, &st1) &&
+		    S_ISLNK(st1.st_mode))
+			unlink(path); /* good */
+		else
+			git_config_set("core.symlinks", "false");
+
+		/* Check if the filesystem is case-insensitive */
+		path[len] = 0;
+		strcpy(path + len, "CoNfIg");
+		if (!access(path, F_OK))
+			git_config_set("core.ignorecase", "true");
+	}
+
+	return reinit;
+}
+
+int init_db(const char *template_dir, unsigned int flags)
+{
+	const char *sha1_dir;
+	char *path;
+	int len, reinit;
+
+	safe_create_dir(get_git_dir(), 0);
+
+	init_is_bare_repository = is_bare_repository();
+
+	/* Check to see if the repository version is right.
+	 * Note that a newly created repository does not have
+	 * config file, so this will not fail.  What we are catching
+	 * is an attempt to reinitialize new repository with an old tool.
+	 */
+	check_repository_format();
+
+	reinit = create_default_files(template_dir);
+
+	sha1_dir = get_object_directory();
+	len = strlen(sha1_dir);
+	path = xmalloc(len + 40);
+	memcpy(path, sha1_dir, len);
+
+	safe_create_dir(sha1_dir, 1);
+	strcpy(path+len, "/pack");
+	safe_create_dir(path, 1);
+	strcpy(path+len, "/info");
+	safe_create_dir(path, 1);
+
+	if (shared_repository) {
+		char buf[10];
+		/* We do not spell "group" and such, so that
+		 * the configuration can be read by older version
+		 * of git. Note, we use octal numbers for new share modes,
+		 * and compatibility values for PERM_GROUP and
+		 * PERM_EVERYBODY.
+		 */
+		if (shared_repository < 0)
+			/* force to the mode value */
+			sprintf(buf, "0%o", -shared_repository);
+		else if (shared_repository == PERM_GROUP)
+			sprintf(buf, "%d", OLD_PERM_GROUP);
+		else if (shared_repository == PERM_EVERYBODY)
+			sprintf(buf, "%d", OLD_PERM_EVERYBODY);
+		else
+			die("oops");
+		git_config_set("core.sharedrepository", buf);
+		git_config_set("receive.denyNonFastforwards", "true");
+	}
+
+	if (!(flags & INIT_DB_QUIET))
+		printf("%s%s Git repository in %s/\n",
+		       reinit ? "Reinitialized existing" : "Initialized empty",
+		       shared_repository ? " shared" : "",
+		       get_git_dir());
+
+	return 0;
+}
+
+static int guess_repository_type(const char *git_dir)
+{
+	char cwd[PATH_MAX];
+	const char *slash;
+
+	/*
+	 * "GIT_DIR=. git init" is always bare.
+	 * "GIT_DIR=`pwd` git init" too.
+	 */
+	if (!strcmp(".", git_dir))
+		return 1;
+	if (!getcwd(cwd, sizeof(cwd)))
+		die_errno("cannot tell cwd");
+	if (!strcmp(git_dir, cwd))
+		return 1;
+	/*
+	 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
+	 */
+	if (!strcmp(git_dir, ".git"))
+		return 0;
+	slash = strrchr(git_dir, '/');
+	if (slash && !strcmp(slash, "/.git"))
+		return 0;
+
+	/*
+	 * Otherwise it is often bare.  At this point
+	 * we are just guessing.
+	 */
+	return 1;
+}
+
+static int shared_callback(const struct option *opt, const char *arg, int unset)
+{
+	*((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
+	return 0;
+}
+
+static const char *const init_db_usage[] = {
+	"git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
+	NULL
+};
+
+/*
+ * If you want to, you can share the DB area with any number of branches.
+ * That has advantages: you can save space by sharing all the SHA1 objects.
+ * On the other hand, it might just make lookup slower and messier. You
+ * be the judge.  The default case is to have one DB per managed directory.
+ */
+int cmd_init_db(int argc, const char **argv, const char *prefix)
+{
+	const char *git_dir;
+	const char *template_dir = NULL;
+	unsigned int flags = 0;
+	const struct option init_db_options[] = {
+		OPT_STRING(0, "template", &template_dir, "template-directory",
+				"provide the directory from which templates will be used"),
+		OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
+				"create a bare repository", 1),
+		{ OPTION_CALLBACK, 0, "shared", &init_shared_repository,
+			"permissions",
+			"specify that the git repository is to be shared amongst several users",
+			PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
+		OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
+
+	if (argc == 1) {
+		int mkdir_tried = 0;
+	retry:
+		if (chdir(argv[0]) < 0) {
+			if (!mkdir_tried) {
+				int saved;
+				/*
+				 * At this point we haven't read any configuration,
+				 * and we know shared_repository should always be 0;
+				 * but just in case we play safe.
+				 */
+				saved = shared_repository;
+				shared_repository = 0;
+				switch (safe_create_leading_directories_const(argv[0])) {
+				case -3:
+					errno = EEXIST;
+					/* fallthru */
+				case -1:
+					die_errno("cannot mkdir %s", argv[0]);
+					break;
+				default:
+					break;
+				}
+				shared_repository = saved;
+				if (mkdir(argv[0], 0777) < 0)
+					die_errno("cannot mkdir %s", argv[0]);
+				mkdir_tried = 1;
+				goto retry;
+			}
+			die_errno("cannot chdir to %s", argv[0]);
+		}
+	} else if (0 < argc) {
+		usage(init_db_usage[0]);
+	}
+	if (is_bare_repository_cfg == 1) {
+		static char git_dir[PATH_MAX+1];
+
+		setenv(GIT_DIR_ENVIRONMENT,
+			getcwd(git_dir, sizeof(git_dir)), 0);
+	}
+
+	if (init_shared_repository != -1)
+		shared_repository = init_shared_repository;
+
+	/*
+	 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
+	 * without --bare.  Catch the error early.
+	 */
+	git_dir = getenv(GIT_DIR_ENVIRONMENT);
+	if ((!git_dir || is_bare_repository_cfg == 1)
+	    && getenv(GIT_WORK_TREE_ENVIRONMENT))
+		die("%s (or --work-tree=<directory>) not allowed without "
+		    "specifying %s (or --git-dir=<directory>)",
+		    GIT_WORK_TREE_ENVIRONMENT,
+		    GIT_DIR_ENVIRONMENT);
+
+	/*
+	 * Set up the default .git directory contents
+	 */
+	if (!git_dir)
+		git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
+
+	if (is_bare_repository_cfg < 0)
+		is_bare_repository_cfg = guess_repository_type(git_dir);
+
+	if (!is_bare_repository_cfg) {
+		if (git_dir) {
+			const char *git_dir_parent = strrchr(git_dir, '/');
+			if (git_dir_parent) {
+				char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
+				git_work_tree_cfg = xstrdup(make_absolute_path(rel));
+				free(rel);
+			}
+		}
+		if (!git_work_tree_cfg) {
+			git_work_tree_cfg = xcalloc(PATH_MAX, 1);
+			if (!getcwd(git_work_tree_cfg, PATH_MAX))
+				die_errno ("Cannot access current working directory");
+		}
+		if (access(get_git_work_tree(), X_OK))
+			die_errno ("Cannot access work tree '%s'",
+				   get_git_work_tree());
+	}
+
+	set_git_dir(make_absolute_path(git_dir));
+
+	return init_db(template_dir, flags);
+}