Adding upstream version 1:2.43.0.upstream/1%2.43.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1895 insertions, 0 deletions

diff --git a/builtin/commit.c b/builtin/commit.c
new file mode 100644
index 0000000..781af2e
--- /dev/null
+++ b/builtin/commit.c
@@ -0,0 +1,1895 @@
+/*
+ * Builtin "git commit"
+ *
+ * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>
+ * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
+ */
+
+#define USE_THE_INDEX_VARIABLE
+#include "builtin.h"
+#include "advice.h"
+#include "config.h"
+#include "lockfile.h"
+#include "cache-tree.h"
+#include "color.h"
+#include "dir.h"
+#include "editor.h"
+#include "environment.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "commit.h"
+#include "gettext.h"
+#include "revision.h"
+#include "wt-status.h"
+#include "run-command.h"
+#include "hook.h"
+#include "refs.h"
+#include "log-tree.h"
+#include "strbuf.h"
+#include "utf8.h"
+#include "object-name.h"
+#include "parse-options.h"
+#include "path.h"
+#include "preload-index.h"
+#include "read-cache.h"
+#include "string-list.h"
+#include "rerere.h"
+#include "unpack-trees.h"
+#include "quote.h"
+#include "submodule.h"
+#include "gpg-interface.h"
+#include "column.h"
+#include "sequencer.h"
+#include "sparse-index.h"
+#include "mailmap.h"
+#include "help.h"
+#include "commit-reach.h"
+#include "commit-graph.h"
+#include "pretty.h"
+
+static const char * const builtin_commit_usage[] = {
+	N_("git commit [-a | --interactive | --patch] [-s] [-v] [-u<mode>] [--amend]\n"
+	   "           [--dry-run] [(-c | -C | --squash) <commit> | --fixup [(amend|reword):]<commit>)]\n"
+	   "           [-F <file> | -m <msg>] [--reset-author] [--allow-empty]\n"
+	   "           [--allow-empty-message] [--no-verify] [-e] [--author=<author>]\n"
+	   "           [--date=<date>] [--cleanup=<mode>] [--[no-]status]\n"
+	   "           [-i | -o] [--pathspec-from-file=<file> [--pathspec-file-nul]]\n"
+	   "           [(--trailer <token>[(=|:)<value>])...] [-S[<keyid>]]\n"
+	   "           [--] [<pathspec>...]"),
+	NULL
+};
+
+static const char * const builtin_status_usage[] = {
+	N_("git status [<options>] [--] [<pathspec>...]"),
+	NULL
+};
+
+static const char empty_amend_advice[] =
+N_("You asked to amend the most recent commit, but doing so would make\n"
+"it empty. You can repeat your command with --allow-empty, or you can\n"
+"remove the commit entirely with \"git reset HEAD^\".\n");
+
+static const char empty_cherry_pick_advice[] =
+N_("The previous cherry-pick is now empty, possibly due to conflict resolution.\n"
+"If you wish to commit it anyway, use:\n"
+"\n"
+"    git commit --allow-empty\n"
+"\n");
+
+static const char empty_rebase_pick_advice[] =
+N_("Otherwise, please use 'git rebase --skip'\n");
+
+static const char empty_cherry_pick_advice_single[] =
+N_("Otherwise, please use 'git cherry-pick --skip'\n");
+
+static const char empty_cherry_pick_advice_multi[] =
+N_("and then use:\n"
+"\n"
+"    git cherry-pick --continue\n"
+"\n"
+"to resume cherry-picking the remaining commits.\n"
+"If you wish to skip this commit, use:\n"
+"\n"
+"    git cherry-pick --skip\n"
+"\n");
+
+static const char *color_status_slots[] = {
+	[WT_STATUS_HEADER]	  = "header",
+	[WT_STATUS_UPDATED]	  = "updated",
+	[WT_STATUS_CHANGED]	  = "changed",
+	[WT_STATUS_UNTRACKED]	  = "untracked",
+	[WT_STATUS_NOBRANCH]	  = "noBranch",
+	[WT_STATUS_UNMERGED]	  = "unmerged",
+	[WT_STATUS_LOCAL_BRANCH]  = "localBranch",
+	[WT_STATUS_REMOTE_BRANCH] = "remoteBranch",
+	[WT_STATUS_ONBRANCH]	  = "branch",
+};
+
+static const char *use_message_buffer;
+static struct lock_file index_lock; /* real index */
+static struct lock_file false_lock; /* used only for partial commits */
+static enum {
+	COMMIT_AS_IS = 1,
+	COMMIT_NORMAL,
+	COMMIT_PARTIAL
+} commit_style;
+
+static const char *logfile, *force_author;
+static const char *template_file;
+/*
+ * The _message variables are commit names from which to take
+ * the commit message and/or authorship.
+ */
+static const char *author_message, *author_message_buffer;
+static char *edit_message, *use_message;
+static char *fixup_message, *fixup_commit, *squash_message;
+static const char *fixup_prefix;
+static int all, also, interactive, patch_interactive, only, amend, signoff;
+static int edit_flag = -1; /* unspecified */
+static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
+static int config_commit_verbose = -1; /* unspecified */
+static int no_post_rewrite, allow_empty_message, pathspec_file_nul;
+static char *untracked_files_arg, *force_date, *ignore_submodule_arg, *ignored_arg;
+static char *sign_commit, *pathspec_from_file;
+static struct strvec trailer_args = STRVEC_INIT;
+
+/*
+ * The default commit message cleanup mode will remove the lines
+ * beginning with # (shell comments) and leading and trailing
+ * whitespaces (empty lines or containing only whitespaces)
+ * if editor is used, and only the whitespaces if the message
+ * is specified explicitly.
+ */
+static enum commit_msg_cleanup_mode cleanup_mode;
+static const char *cleanup_arg;
+
+static enum commit_whence whence;
+static int use_editor = 1, include_status = 1;
+static int have_option_m;
+static struct strbuf message = STRBUF_INIT;
+
+static enum wt_status_format status_format = STATUS_FORMAT_UNSPECIFIED;
+
+static int opt_pass_trailer(const struct option *opt, const char *arg, int unset)
+{
+	BUG_ON_OPT_NEG(unset);
+
+	strvec_pushl(opt->value, "--trailer", arg, NULL);
+	return 0;
+}
+
+static int opt_parse_porcelain(const struct option *opt, const char *arg, int unset)
+{
+	enum wt_status_format *value = (enum wt_status_format *)opt->value;
+	if (unset)
+		*value = STATUS_FORMAT_NONE;
+	else if (!arg)
+		*value = STATUS_FORMAT_PORCELAIN;
+	else if (!strcmp(arg, "v1") || !strcmp(arg, "1"))
+		*value = STATUS_FORMAT_PORCELAIN;
+	else if (!strcmp(arg, "v2") || !strcmp(arg, "2"))
+		*value = STATUS_FORMAT_PORCELAIN_V2;
+	else
+		die("unsupported porcelain version '%s'", arg);
+
+	return 0;
+}
+
+static int opt_parse_m(const struct option *opt, const char *arg, int unset)
+{
+	struct strbuf *buf = opt->value;
+	if (unset) {
+		have_option_m = 0;
+		strbuf_setlen(buf, 0);
+	} else {
+		have_option_m = 1;
+		if (buf->len)
+			strbuf_addch(buf, '\n');
+		strbuf_addstr(buf, arg);
+		strbuf_complete_line(buf);
+	}
+	return 0;
+}
+
+static int opt_parse_rename_score(const struct option *opt, const char *arg, int unset)
+{
+	const char **value = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (arg != NULL && *arg == '=')
+		arg = arg + 1;
+
+	*value = arg;
+	return 0;
+}
+
+static void determine_whence(struct wt_status *s)
+{
+	if (file_exists(git_path_merge_head(the_repository)))
+		whence = FROM_MERGE;
+	else if (!sequencer_determine_whence(the_repository, &whence))
+		whence = FROM_COMMIT;
+	if (s)
+		s->whence = whence;
+}
+
+static void status_init_config(struct wt_status *s, config_fn_t fn)
+{
+	wt_status_prepare(the_repository, s);
+	init_diff_ui_defaults();
+	git_config(fn, s);
+	determine_whence(s);
+	s->hints = advice_enabled(ADVICE_STATUS_HINTS); /* must come after git_config() */
+}
+
+static void rollback_index_files(void)
+{
+	switch (commit_style) {
+	case COMMIT_AS_IS:
+		break; /* nothing to do */
+	case COMMIT_NORMAL:
+		rollback_lock_file(&index_lock);
+		break;
+	case COMMIT_PARTIAL:
+		rollback_lock_file(&index_lock);
+		rollback_lock_file(&false_lock);
+		break;
+	}
+}
+
+static int commit_index_files(void)
+{
+	int err = 0;
+
+	switch (commit_style) {
+	case COMMIT_AS_IS:
+		break; /* nothing to do */
+	case COMMIT_NORMAL:
+		err = commit_lock_file(&index_lock);
+		break;
+	case COMMIT_PARTIAL:
+		err = commit_lock_file(&index_lock);
+		rollback_lock_file(&false_lock);
+		break;
+	}
+
+	return err;
+}
+
+/*
+ * Take a union of paths in the index and the named tree (typically, "HEAD"),
+ * and return the paths that match the given pattern in list.
+ */
+static int list_paths(struct string_list *list, const char *with_tree,
+		      const struct pathspec *pattern)
+{
+	int i, ret;
+	char *m;
+
+	if (!pattern->nr)
+		return 0;
+
+	m = xcalloc(1, pattern->nr);
+
+	if (with_tree) {
+		char *max_prefix = common_prefix(pattern);
+		overlay_tree_on_index(&the_index, with_tree, max_prefix);
+		free(max_prefix);
+	}
+
+	/* TODO: audit for interaction with sparse-index. */
+	ensure_full_index(&the_index);
+	for (i = 0; i < the_index.cache_nr; i++) {
+		const struct cache_entry *ce = the_index.cache[i];
+		struct string_list_item *item;
+
+		if (ce->ce_flags & CE_UPDATE)
+			continue;
+		if (!ce_path_match(&the_index, ce, pattern, m))
+			continue;
+		item = string_list_insert(list, ce->name);
+		if (ce_skip_worktree(ce))
+			item->util = item; /* better a valid pointer than a fake one */
+	}
+
+	ret = report_path_error(m, pattern);
+	free(m);
+	return ret;
+}
+
+static void add_remove_files(struct string_list *list)
+{
+	int i;
+	for (i = 0; i < list->nr; i++) {
+		struct stat st;
+		struct string_list_item *p = &(list->items[i]);
+
+		/* p->util is skip-worktree */
+		if (p->util)
+			continue;
+
+		if (!lstat(p->string, &st)) {
+			if (add_to_index(&the_index, p->string, &st, 0))
+				die(_("updating files failed"));
+		} else
+			remove_file_from_index(&the_index, p->string);
+	}
+}
+
+static void create_base_index(const struct commit *current_head)
+{
+	struct tree *tree;
+	struct unpack_trees_options opts;
+	struct tree_desc t;
+
+	if (!current_head) {
+		discard_index(&the_index);
+		return;
+	}
+
+	memset(&opts, 0, sizeof(opts));
+	opts.head_idx = 1;
+	opts.index_only = 1;
+	opts.merge = 1;
+	opts.src_index = &the_index;
+	opts.dst_index = &the_index;
+
+	opts.fn = oneway_merge;
+	tree = parse_tree_indirect(&current_head->object.oid);
+	if (!tree)
+		die(_("failed to unpack HEAD tree object"));
+	parse_tree(tree);
+	init_tree_desc(&t, tree->buffer, tree->size);
+	if (unpack_trees(1, &t, &opts))
+		exit(128); /* We've already reported the error, finish dying */
+}
+
+static void refresh_cache_or_die(int refresh_flags)
+{
+	/*
+	 * refresh_flags contains REFRESH_QUIET, so the only errors
+	 * are for unmerged entries.
+	 */
+	if (refresh_index(&the_index, refresh_flags | REFRESH_IN_PORCELAIN, NULL, NULL, NULL))
+		die_resolve_conflict("commit");
+}
+
+static const char *prepare_index(const char **argv, const char *prefix,
+				 const struct commit *current_head, int is_status)
+{
+	struct string_list partial = STRING_LIST_INIT_DUP;
+	struct pathspec pathspec;
+	int refresh_flags = REFRESH_QUIET;
+	const char *ret;
+
+	if (is_status)
+		refresh_flags |= REFRESH_UNMERGED;
+	parse_pathspec(&pathspec, 0,
+		       PATHSPEC_PREFER_FULL,
+		       prefix, argv);
+
+	if (pathspec_from_file) {
+		if (interactive)
+			die(_("options '%s' and '%s' cannot be used together"), "--pathspec-from-file", "--interactive/--patch");
+
+		if (all)
+			die(_("options '%s' and '%s' cannot be used together"), "--pathspec-from-file", "-a");
+
+		if (pathspec.nr)
+			die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file");
+
+		parse_pathspec_file(&pathspec, 0,
+				    PATHSPEC_PREFER_FULL,
+				    prefix, pathspec_from_file, pathspec_file_nul);
+	} else if (pathspec_file_nul) {
+		die(_("the option '%s' requires '%s'"), "--pathspec-file-nul", "--pathspec-from-file");
+	}
+
+	if (!pathspec.nr && (also || (only && !allow_empty &&
+	    (!amend || (fixup_message && strcmp(fixup_prefix, "amend"))))))
+		die(_("No paths with --include/--only does not make sense."));
+
+	if (repo_read_index_preload(the_repository, &pathspec, 0) < 0)
+		die(_("index file corrupt"));
+
+	if (interactive) {
+		char *old_index_env = NULL, *old_repo_index_file;
+		repo_hold_locked_index(the_repository, &index_lock,
+				       LOCK_DIE_ON_ERROR);
+
+		refresh_cache_or_die(refresh_flags);
+
+		if (write_locked_index(&the_index, &index_lock, 0))
+			die(_("unable to create temporary index"));
+
+		old_repo_index_file = the_repository->index_file;
+		the_repository->index_file =
+			(char *)get_lock_file_path(&index_lock);
+		old_index_env = xstrdup_or_null(getenv(INDEX_ENVIRONMENT));
+		setenv(INDEX_ENVIRONMENT, the_repository->index_file, 1);
+
+		if (interactive_add(argv, prefix, patch_interactive) != 0)
+			die(_("interactive add failed"));
+
+		the_repository->index_file = old_repo_index_file;
+		if (old_index_env && *old_index_env)
+			setenv(INDEX_ENVIRONMENT, old_index_env, 1);
+		else
+			unsetenv(INDEX_ENVIRONMENT);
+		FREE_AND_NULL(old_index_env);
+
+		discard_index(&the_index);
+		read_index_from(&the_index, get_lock_file_path(&index_lock),
+				get_git_dir());
+		if (cache_tree_update(&the_index, WRITE_TREE_SILENT) == 0) {
+			if (reopen_lock_file(&index_lock) < 0)
+				die(_("unable to write index file"));
+			if (write_locked_index(&the_index, &index_lock, 0))
+				die(_("unable to update temporary index"));
+		} else
+			warning(_("Failed to update main cache tree"));
+
+		commit_style = COMMIT_NORMAL;
+		ret = get_lock_file_path(&index_lock);
+		goto out;
+	}
+
+	/*
+	 * Non partial, non as-is commit.
+	 *
+	 * (1) get the real index;
+	 * (2) update the_index as necessary;
+	 * (3) write the_index out to the real index (still locked);
+	 * (4) return the name of the locked index file.
+	 *
+	 * The caller should run hooks on the locked real index, and
+	 * (A) if all goes well, commit the real index;
+	 * (B) on failure, rollback the real index.
+	 */
+	if (all || (also && pathspec.nr)) {
+		repo_hold_locked_index(the_repository, &index_lock,
+				       LOCK_DIE_ON_ERROR);
+		add_files_to_cache(the_repository, also ? prefix : NULL,
+				   &pathspec, 0, 0);
+		refresh_cache_or_die(refresh_flags);
+		cache_tree_update(&the_index, WRITE_TREE_SILENT);
+		if (write_locked_index(&the_index, &index_lock, 0))
+			die(_("unable to write new index file"));
+		commit_style = COMMIT_NORMAL;
+		ret = get_lock_file_path(&index_lock);
+		goto out;
+	}
+
+	/*
+	 * As-is commit.
+	 *
+	 * (1) return the name of the real index file.
+	 *
+	 * The caller should run hooks on the real index,
+	 * and create commit from the_index.
+	 * We still need to refresh the index here.
+	 */
+	if (!only && !pathspec.nr) {
+		repo_hold_locked_index(the_repository, &index_lock,
+				       LOCK_DIE_ON_ERROR);
+		refresh_cache_or_die(refresh_flags);
+		if (the_index.cache_changed
+		    || !cache_tree_fully_valid(the_index.cache_tree))
+			cache_tree_update(&the_index, WRITE_TREE_SILENT);
+		if (write_locked_index(&the_index, &index_lock,
+				       COMMIT_LOCK | SKIP_IF_UNCHANGED))
+			die(_("unable to write new index file"));
+		commit_style = COMMIT_AS_IS;
+		ret = get_index_file();
+		goto out;
+	}
+
+	/*
+	 * A partial commit.
+	 *
+	 * (0) find the set of affected paths;
+	 * (1) get lock on the real index file;
+	 * (2) update the_index with the given paths;
+	 * (3) write the_index out to the real index (still locked);
+	 * (4) get lock on the false index file;
+	 * (5) reset the_index from HEAD;
+	 * (6) update the_index the same way as (2);
+	 * (7) write the_index out to the false index file;
+	 * (8) return the name of the false index file (still locked);
+	 *
+	 * The caller should run hooks on the locked false index, and
+	 * create commit from it.  Then
+	 * (A) if all goes well, commit the real index;
+	 * (B) on failure, rollback the real index;
+	 * In either case, rollback the false index.
+	 */
+	commit_style = COMMIT_PARTIAL;
+
+	if (whence != FROM_COMMIT) {
+		if (whence == FROM_MERGE)
+			die(_("cannot do a partial commit during a merge."));
+		else if (is_from_cherry_pick(whence))
+			die(_("cannot do a partial commit during a cherry-pick."));
+		else if (is_from_rebase(whence))
+			die(_("cannot do a partial commit during a rebase."));
+	}
+
+	if (list_paths(&partial, !current_head ? NULL : "HEAD", &pathspec))
+		exit(1);
+
+	discard_index(&the_index);
+	if (repo_read_index(the_repository) < 0)
+		die(_("cannot read the index"));
+
+	repo_hold_locked_index(the_repository, &index_lock, LOCK_DIE_ON_ERROR);
+	add_remove_files(&partial);
+	refresh_index(&the_index, REFRESH_QUIET, NULL, NULL, NULL);
+	cache_tree_update(&the_index, WRITE_TREE_SILENT);
+	if (write_locked_index(&the_index, &index_lock, 0))
+		die(_("unable to write new index file"));
+
+	hold_lock_file_for_update(&false_lock,
+				  git_path("next-index-%"PRIuMAX,
+					   (uintmax_t) getpid()),
+				  LOCK_DIE_ON_ERROR);
+
+	create_base_index(current_head);
+	add_remove_files(&partial);
+	refresh_index(&the_index, REFRESH_QUIET, NULL, NULL, NULL);
+
+	if (write_locked_index(&the_index, &false_lock, 0))
+		die(_("unable to write temporary index file"));
+
+	discard_index(&the_index);
+	ret = get_lock_file_path(&false_lock);
+	read_index_from(&the_index, ret, get_git_dir());
+out:
+	string_list_clear(&partial, 0);
+	clear_pathspec(&pathspec);
+	return ret;
+}
+
+static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
+		      struct wt_status *s)
+{
+	struct object_id oid;
+
+	if (s->relative_paths)
+		s->prefix = prefix;
+
+	if (amend) {
+		s->amend = 1;
+		s->reference = "HEAD^1";
+	}
+	s->verbose = verbose;
+	s->index_file = index_file;
+	s->fp = fp;
+	s->nowarn = nowarn;
+	s->is_initial = repo_get_oid(the_repository, s->reference, &oid) ? 1 : 0;
+	if (!s->is_initial)
+		oidcpy(&s->oid_commit, &oid);
+	s->status_format = status_format;
+	s->ignore_submodule_arg = ignore_submodule_arg;
+
+	wt_status_collect(s);
+	wt_status_print(s);
+	wt_status_collect_free_buffers(s);
+
+	return s->committable;
+}
+
+static int is_a_merge(const struct commit *current_head)
+{
+	return !!(current_head->parents && current_head->parents->next);
+}
+
+static void assert_split_ident(struct ident_split *id, const struct strbuf *buf)
+{
+	if (split_ident_line(id, buf->buf, buf->len) || !id->date_begin)
+		BUG("unable to parse our own ident: %s", buf->buf);
+}
+
+static void export_one(const char *var, const char *s, const char *e, int hack)
+{
+	struct strbuf buf = STRBUF_INIT;
+	if (hack)
+		strbuf_addch(&buf, hack);
+	strbuf_add(&buf, s, e - s);
+	setenv(var, buf.buf, 1);
+	strbuf_release(&buf);
+}
+
+static int parse_force_date(const char *in, struct strbuf *out)
+{
+	strbuf_addch(out, '@');
+
+	if (parse_date(in, out) < 0) {
+		int errors = 0;
+		unsigned long t = approxidate_careful(in, &errors);
+		if (errors)
+			return -1;
+		strbuf_addf(out, "%lu", t);
+	}
+
+	return 0;
+}
+
+static void set_ident_var(char **buf, char *val)
+{
+	free(*buf);
+	*buf = val;
+}
+
+static void determine_author_info(struct strbuf *author_ident)
+{
+	char *name, *email, *date;
+	struct ident_split author;
+
+	name = xstrdup_or_null(getenv("GIT_AUTHOR_NAME"));
+	email = xstrdup_or_null(getenv("GIT_AUTHOR_EMAIL"));
+	date = xstrdup_or_null(getenv("GIT_AUTHOR_DATE"));
+
+	if (author_message) {
+		struct ident_split ident;
+		size_t len;
+		const char *a;
+
+		a = find_commit_header(author_message_buffer, "author", &len);
+		if (!a)
+			die(_("commit '%s' lacks author header"), author_message);
+		if (split_ident_line(&ident, a, len) < 0)
+			die(_("commit '%s' has malformed author line"), author_message);
+
+		set_ident_var(&name, xmemdupz(ident.name_begin, ident.name_end - ident.name_begin));
+		set_ident_var(&email, xmemdupz(ident.mail_begin, ident.mail_end - ident.mail_begin));
+
+		if (ident.date_begin) {
+			struct strbuf date_buf = STRBUF_INIT;
+			strbuf_addch(&date_buf, '@');
+			strbuf_add(&date_buf, ident.date_begin, ident.date_end - ident.date_begin);
+			strbuf_addch(&date_buf, ' ');
+			strbuf_add(&date_buf, ident.tz_begin, ident.tz_end - ident.tz_begin);
+			set_ident_var(&date, strbuf_detach(&date_buf, NULL));
+		}
+	}
+
+	if (force_author) {
+		struct ident_split ident;
+
+		if (split_ident_line(&ident, force_author, strlen(force_author)) < 0)
+			die(_("malformed --author parameter"));
+		set_ident_var(&name, xmemdupz(ident.name_begin, ident.name_end - ident.name_begin));
+		set_ident_var(&email, xmemdupz(ident.mail_begin, ident.mail_end - ident.mail_begin));
+	}
+
+	if (force_date) {
+		struct strbuf date_buf = STRBUF_INIT;
+		if (parse_force_date(force_date, &date_buf))
+			die(_("invalid date format: %s"), force_date);
+		set_ident_var(&date, strbuf_detach(&date_buf, NULL));
+	}
+
+	strbuf_addstr(author_ident, fmt_ident(name, email, WANT_AUTHOR_IDENT, date,
+				IDENT_STRICT));
+	assert_split_ident(&author, author_ident);
+	export_one("GIT_AUTHOR_NAME", author.name_begin, author.name_end, 0);
+	export_one("GIT_AUTHOR_EMAIL", author.mail_begin, author.mail_end, 0);
+	export_one("GIT_AUTHOR_DATE", author.date_begin, author.tz_end, '@');
+	free(name);
+	free(email);
+	free(date);
+}
+
+static int author_date_is_interesting(void)
+{
+	return author_message || force_date;
+}
+
+static void adjust_comment_line_char(const struct strbuf *sb)
+{
+	char candidates[] = "#;@!$%^&|:";
+	char *candidate;
+	const char *p;
+
+	comment_line_char = candidates[0];
+	if (!memchr(sb->buf, comment_line_char, sb->len))
+		return;
+
+	p = sb->buf;
+	candidate = strchr(candidates, *p);
+	if (candidate)
+		*candidate = ' ';
+	for (p = sb->buf; *p; p++) {
+		if ((p[0] == '\n' || p[0] == '\r') && p[1]) {
+			candidate = strchr(candidates, p[1]);
+			if (candidate)
+				*candidate = ' ';
+		}
+	}
+
+	for (p = candidates; *p == ' '; p++)
+		;
+	if (!*p)
+		die(_("unable to select a comment character that is not used\n"
+		      "in the current commit message"));
+	comment_line_char = *p;
+}
+
+static void prepare_amend_commit(struct commit *commit, struct strbuf *sb,
+				struct pretty_print_context *ctx)
+{
+	const char *buffer, *subject, *fmt;
+
+	buffer = repo_get_commit_buffer(the_repository, commit, NULL);
+	find_commit_subject(buffer, &subject);
+	/*
+	 * If we amend the 'amend!' commit then we don't want to
+	 * duplicate the subject line.
+	 */
+	fmt = starts_with(subject, "amend!") ? "%b" : "%B";
+	repo_format_commit_message(the_repository, commit, fmt, sb, ctx);
+	repo_unuse_commit_buffer(the_repository, commit, buffer);
+}
+
+static int prepare_to_commit(const char *index_file, const char *prefix,
+			     struct commit *current_head,
+			     struct wt_status *s,
+			     struct strbuf *author_ident)
+{
+	struct stat statbuf;
+	struct strbuf committer_ident = STRBUF_INIT;
+	int committable;
+	struct strbuf sb = STRBUF_INIT;
+	const char *hook_arg1 = NULL;
+	const char *hook_arg2 = NULL;
+	int clean_message_contents = (cleanup_mode != COMMIT_MSG_CLEANUP_NONE);
+	int old_display_comment_prefix;
+	int merge_contains_scissors = 0;
+	int invoked_hook;
+
+	/* This checks and barfs if author is badly specified */
+	determine_author_info(author_ident);
+
+	if (!no_verify && run_commit_hook(use_editor, index_file, &invoked_hook,
+					  "pre-commit", NULL))
+		return 0;
+
+	if (squash_message) {
+		/*
+		 * Insert the proper subject line before other commit
+		 * message options add their content.
+		 */
+		if (use_message && !strcmp(use_message, squash_message))
+			strbuf_addstr(&sb, "squash! ");
+		else {
+			struct pretty_print_context ctx = {0};
+			struct commit *c;
+			c = lookup_commit_reference_by_name(squash_message);
+			if (!c)
+				die(_("could not lookup commit '%s'"), squash_message);
+			ctx.output_encoding = get_commit_output_encoding();
+			repo_format_commit_message(the_repository, c,
+						   "squash! %s\n\n", &sb,
+						   &ctx);
+		}
+	}
+
+	if (have_option_m && !fixup_message) {
+		strbuf_addbuf(&sb, &message);
+		hook_arg1 = "message";
+	} else if (logfile && !strcmp(logfile, "-")) {
+		if (isatty(0))
+			fprintf(stderr, _("(reading log message from standard input)\n"));
+		if (strbuf_read(&sb, 0, 0) < 0)
+			die_errno(_("could not read log from standard input"));
+		hook_arg1 = "message";
+	} else if (logfile) {
+		if (strbuf_read_file(&sb, logfile, 0) < 0)
+			die_errno(_("could not read log file '%s'"),
+				  logfile);
+		hook_arg1 = "message";
+	} else if (use_message) {
+		char *buffer;
+		buffer = strstr(use_message_buffer, "\n\n");
+		if (buffer)
+			strbuf_addstr(&sb, skip_blank_lines(buffer + 2));
+		hook_arg1 = "commit";
+		hook_arg2 = use_message;
+	} else if (fixup_message) {
+		struct pretty_print_context ctx = {0};
+		struct commit *commit;
+		char *fmt;
+		commit = lookup_commit_reference_by_name(fixup_commit);
+		if (!commit)
+			die(_("could not lookup commit '%s'"), fixup_commit);
+		ctx.output_encoding = get_commit_output_encoding();
+		fmt = xstrfmt("%s! %%s\n\n", fixup_prefix);
+		repo_format_commit_message(the_repository, commit, fmt, &sb,
+					   &ctx);
+		free(fmt);
+		hook_arg1 = "message";
+
+		/*
+		 * Only `-m` commit message option is checked here, as
+		 * it supports `--fixup` to append the commit message.
+		 *
+		 * The other commit message options `-c`/`-C`/`-F` are
+		 * incompatible with all the forms of `--fixup` and
+		 * have already errored out while parsing the `git commit`
+		 * options.
+		 */
+		if (have_option_m && !strcmp(fixup_prefix, "fixup"))
+			strbuf_addbuf(&sb, &message);
+
+		if (!strcmp(fixup_prefix, "amend")) {
+			if (have_option_m)
+				die(_("options '%s' and '%s:%s' cannot be used together"), "-m", "--fixup", fixup_message);
+			prepare_amend_commit(commit, &sb, &ctx);
+		}
+	} else if (!stat(git_path_merge_msg(the_repository), &statbuf)) {
+		size_t merge_msg_start;
+
+		/*
+		 * prepend SQUASH_MSG here if it exists and a
+		 * "merge --squash" was originally performed
+		 */
+		if (!stat(git_path_squash_msg(the_repository), &statbuf)) {
+			if (strbuf_read_file(&sb, git_path_squash_msg(the_repository), 0) < 0)
+				die_errno(_("could not read SQUASH_MSG"));
+			hook_arg1 = "squash";
+		} else
+			hook_arg1 = "merge";
+
+		merge_msg_start = sb.len;
+		if (strbuf_read_file(&sb, git_path_merge_msg(the_repository), 0) < 0)
+			die_errno(_("could not read MERGE_MSG"));
+
+		if (cleanup_mode == COMMIT_MSG_CLEANUP_SCISSORS &&
+		    wt_status_locate_end(sb.buf + merge_msg_start,
+					 sb.len - merge_msg_start) <
+				sb.len - merge_msg_start)
+			merge_contains_scissors = 1;
+	} else if (!stat(git_path_squash_msg(the_repository), &statbuf)) {
+		if (strbuf_read_file(&sb, git_path_squash_msg(the_repository), 0) < 0)
+			die_errno(_("could not read SQUASH_MSG"));
+		hook_arg1 = "squash";
+	} else if (template_file) {
+		if (strbuf_read_file(&sb, template_file, 0) < 0)
+			die_errno(_("could not read '%s'"), template_file);
+		hook_arg1 = "template";
+		clean_message_contents = 0;
+	}
+
+	/*
+	 * The remaining cases don't modify the template message, but
+	 * just set the argument(s) to the prepare-commit-msg hook.
+	 */
+	else if (whence == FROM_MERGE)
+		hook_arg1 = "merge";
+	else if (is_from_cherry_pick(whence) || whence == FROM_REBASE_PICK) {
+		hook_arg1 = "commit";
+		hook_arg2 = "CHERRY_PICK_HEAD";
+	}
+
+	if (squash_message) {
+		/*
+		 * If squash_commit was used for the commit subject,
+		 * then we're possibly hijacking other commit log options.
+		 * Reset the hook args to tell the real story.
+		 */
+		hook_arg1 = "message";
+		hook_arg2 = "";
+	}
+
+	s->fp = fopen_for_writing(git_path_commit_editmsg());
+	if (!s->fp)
+		die_errno(_("could not open '%s'"), git_path_commit_editmsg());
+
+	/* Ignore status.displayCommentPrefix: we do need comments in COMMIT_EDITMSG. */
+	old_display_comment_prefix = s->display_comment_prefix;
+	s->display_comment_prefix = 1;
+
+	/*
+	 * Most hints are counter-productive when the commit has
+	 * already started.
+	 */
+	s->hints = 0;
+
+	if (clean_message_contents)
+		strbuf_stripspace(&sb, '\0');
+
+	if (signoff)
+		append_signoff(&sb, ignore_non_trailer(sb.buf, sb.len), 0);
+
+	if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
+		die_errno(_("could not write commit template"));
+
+	if (auto_comment_line_char)
+		adjust_comment_line_char(&sb);
+	strbuf_release(&sb);
+
+	/* This checks if committer ident is explicitly given */
+	strbuf_addstr(&committer_ident, git_committer_info(IDENT_STRICT));
+	if (use_editor && include_status) {
+		int ident_shown = 0;
+		int saved_color_setting;
+		struct ident_split ci, ai;
+		const char *hint_cleanup_all = allow_empty_message ?
+			_("Please enter the commit message for your changes."
+			  " Lines starting\nwith '%c' will be ignored.\n") :
+			_("Please enter the commit message for your changes."
+			  " Lines starting\nwith '%c' will be ignored, and an empty"
+			  " message aborts the commit.\n");
+		const char *hint_cleanup_space = allow_empty_message ?
+			_("Please enter the commit message for your changes."
+			  " Lines starting\n"
+			  "with '%c' will be kept; you may remove them"
+			  " yourself if you want to.\n") :
+			_("Please enter the commit message for your changes."
+			  " Lines starting\n"
+			  "with '%c' will be kept; you may remove them"
+			  " yourself if you want to.\n"
+			  "An empty message aborts the commit.\n");
+		if (whence != FROM_COMMIT) {
+			if (cleanup_mode == COMMIT_MSG_CLEANUP_SCISSORS &&
+				!merge_contains_scissors)
+				wt_status_add_cut_line(s->fp);
+			status_printf_ln(
+				s, GIT_COLOR_NORMAL,
+				whence == FROM_MERGE ?
+					      _("\n"
+					  "It looks like you may be committing a merge.\n"
+					  "If this is not correct, please run\n"
+					  "	git update-ref -d MERGE_HEAD\n"
+					  "and try again.\n") :
+					      _("\n"
+					  "It looks like you may be committing a cherry-pick.\n"
+					  "If this is not correct, please run\n"
+					  "	git update-ref -d CHERRY_PICK_HEAD\n"
+					  "and try again.\n"));
+		}
+
+		fprintf(s->fp, "\n");
+		if (cleanup_mode == COMMIT_MSG_CLEANUP_ALL)
+			status_printf(s, GIT_COLOR_NORMAL, hint_cleanup_all, comment_line_char);
+		else if (cleanup_mode == COMMIT_MSG_CLEANUP_SCISSORS) {
+			if (whence == FROM_COMMIT && !merge_contains_scissors)
+				wt_status_add_cut_line(s->fp);
+		} else /* COMMIT_MSG_CLEANUP_SPACE, that is. */
+			status_printf(s, GIT_COLOR_NORMAL, hint_cleanup_space, comment_line_char);
+
+		/*
+		 * These should never fail because they come from our own
+		 * fmt_ident. They may fail the sane_ident test, but we know
+		 * that the name and mail pointers will at least be valid,
+		 * which is enough for our tests and printing here.
+		 */
+		assert_split_ident(&ai, author_ident);
+		assert_split_ident(&ci, &committer_ident);
+
+		if (ident_cmp(&ai, &ci))
+			status_printf_ln(s, GIT_COLOR_NORMAL,
+				_("%s"
+				"Author:    %.*s <%.*s>"),
+				ident_shown++ ? "" : "\n",
+				(int)(ai.name_end - ai.name_begin), ai.name_begin,
+				(int)(ai.mail_end - ai.mail_begin), ai.mail_begin);
+
+		if (author_date_is_interesting())
+			status_printf_ln(s, GIT_COLOR_NORMAL,
+				_("%s"
+				"Date:      %s"),
+				ident_shown++ ? "" : "\n",
+				show_ident_date(&ai, DATE_MODE(NORMAL)));
+
+		if (!committer_ident_sufficiently_given())
+			status_printf_ln(s, GIT_COLOR_NORMAL,
+				_("%s"
+				"Committer: %.*s <%.*s>"),
+				ident_shown++ ? "" : "\n",
+				(int)(ci.name_end - ci.name_begin), ci.name_begin,
+				(int)(ci.mail_end - ci.mail_begin), ci.mail_begin);
+
+		status_printf_ln(s, GIT_COLOR_NORMAL, "%s", ""); /* Add new line for clarity */
+
+		saved_color_setting = s->use_color;
+		s->use_color = 0;
+		committable = run_status(s->fp, index_file, prefix, 1, s);
+		s->use_color = saved_color_setting;
+		string_list_clear(&s->change, 1);
+	} else {
+		struct object_id oid;
+		const char *parent = "HEAD";
+
+		if (!the_index.initialized && repo_read_index(the_repository) < 0)
+			die(_("Cannot read index"));
+
+		if (amend)
+			parent = "HEAD^1";
+
+		if (repo_get_oid(the_repository, parent, &oid)) {
+			int i, ita_nr = 0;
+
+			/* TODO: audit for interaction with sparse-index. */
+			ensure_full_index(&the_index);
+			for (i = 0; i < the_index.cache_nr; i++)
+				if (ce_intent_to_add(the_index.cache[i]))
+					ita_nr++;
+			committable = the_index.cache_nr - ita_nr > 0;
+		} else {
+			/*
+			 * Unless the user did explicitly request a submodule
+			 * ignore mode by passing a command line option we do
+			 * not ignore any changed submodule SHA-1s when
+			 * comparing index and parent, no matter what is
+			 * configured. Otherwise we won't commit any
+			 * submodules which were manually staged, which would
+			 * be really confusing.
+			 */
+			struct diff_flags flags = DIFF_FLAGS_INIT;
+			flags.override_submodule_config = 1;
+			if (ignore_submodule_arg &&
+			    !strcmp(ignore_submodule_arg, "all"))
+				flags.ignore_submodules = 1;
+			committable = index_differs_from(the_repository,
+							 parent, &flags, 1);
+		}
+	}
+	strbuf_release(&committer_ident);
+
+	fclose(s->fp);
+
+	if (trailer_args.nr) {
+		struct child_process run_trailer = CHILD_PROCESS_INIT;
+
+		strvec_pushl(&run_trailer.args, "interpret-trailers",
+			     "--in-place", "--no-divider",
+			     git_path_commit_editmsg(), NULL);
+		strvec_pushv(&run_trailer.args, trailer_args.v);
+		run_trailer.git_cmd = 1;
+		if (run_command(&run_trailer))
+			die(_("unable to pass trailers to --trailers"));
+		strvec_clear(&trailer_args);
+	}
+
+	/*
+	 * Reject an attempt to record a non-merge empty commit without
+	 * explicit --allow-empty. In the cherry-pick case, it may be
+	 * empty due to conflict resolution, which the user should okay.
+	 */
+	if (!committable && whence != FROM_MERGE && !allow_empty &&
+	    !(amend && is_a_merge(current_head))) {
+		s->hints = advice_enabled(ADVICE_STATUS_HINTS);
+		s->display_comment_prefix = old_display_comment_prefix;
+		run_status(stdout, index_file, prefix, 0, s);
+		if (amend)
+			fputs(_(empty_amend_advice), stderr);
+		else if (is_from_cherry_pick(whence) ||
+			 whence == FROM_REBASE_PICK) {
+			fputs(_(empty_cherry_pick_advice), stderr);
+			if (whence == FROM_CHERRY_PICK_SINGLE)
+				fputs(_(empty_cherry_pick_advice_single), stderr);
+			else if (whence == FROM_CHERRY_PICK_MULTI)
+				fputs(_(empty_cherry_pick_advice_multi), stderr);
+			else
+				fputs(_(empty_rebase_pick_advice), stderr);
+		}
+		return 0;
+	}
+
+	if (!no_verify && invoked_hook) {
+		/*
+		 * Re-read the index as the pre-commit-commit hook was invoked
+		 * and could have updated it. We must do this before we invoke
+		 * the editor and after we invoke run_status above.
+		 */
+		discard_index(&the_index);
+	}
+	read_index_from(&the_index, index_file, get_git_dir());
+
+	if (cache_tree_update(&the_index, 0)) {
+		error(_("Error building trees"));
+		return 0;
+	}
+
+	if (run_commit_hook(use_editor, index_file, NULL, "prepare-commit-msg",
+			    git_path_commit_editmsg(), hook_arg1, hook_arg2, NULL))
+		return 0;
+
+	if (use_editor) {
+		struct strvec env = STRVEC_INIT;
+
+		strvec_pushf(&env, "GIT_INDEX_FILE=%s", index_file);
+		if (launch_editor(git_path_commit_editmsg(), NULL, env.v)) {
+			fprintf(stderr,
+			_("Please supply the message using either -m or -F option.\n"));
+			exit(1);
+		}
+		strvec_clear(&env);
+	}
+
+	if (!no_verify &&
+	    run_commit_hook(use_editor, index_file, NULL, "commit-msg",
+			    git_path_commit_editmsg(), NULL)) {
+		return 0;
+	}
+
+	return 1;
+}
+
+static const char *find_author_by_nickname(const char *name)
+{
+	struct rev_info revs;
+	struct commit *commit;
+	struct strbuf buf = STRBUF_INIT;
+	const char *av[20];
+	int ac = 0;
+
+	repo_init_revisions(the_repository, &revs, NULL);
+	strbuf_addf(&buf, "--author=%s", name);
+	av[++ac] = "--all";
+	av[++ac] = "-i";
+	av[++ac] = buf.buf;
+	av[++ac] = NULL;
+	setup_revisions(ac, av, &revs, NULL);
+	revs.mailmap = xmalloc(sizeof(struct string_list));
+	string_list_init_nodup(revs.mailmap);
+	read_mailmap(revs.mailmap);
+
+	if (prepare_revision_walk(&revs))
+		die(_("revision walk setup failed"));
+	commit = get_revision(&revs);
+	if (commit) {
+		struct pretty_print_context ctx = {0};
+		ctx.date_mode.type = DATE_NORMAL;
+		strbuf_release(&buf);
+		repo_format_commit_message(the_repository, commit,
+					   "%aN <%aE>", &buf, &ctx);
+		release_revisions(&revs);
+		return strbuf_detach(&buf, NULL);
+	}
+	die(_("--author '%s' is not 'Name <email>' and matches no existing author"), name);
+}
+
+static void handle_ignored_arg(struct wt_status *s)
+{
+	if (!ignored_arg)
+		; /* default already initialized */
+	else if (!strcmp(ignored_arg, "traditional"))
+		s->show_ignored_mode = SHOW_TRADITIONAL_IGNORED;
+	else if (!strcmp(ignored_arg, "no"))
+		s->show_ignored_mode = SHOW_NO_IGNORED;
+	else if (!strcmp(ignored_arg, "matching"))
+		s->show_ignored_mode = SHOW_MATCHING_IGNORED;
+	else
+		die(_("Invalid ignored mode '%s'"), ignored_arg);
+}
+
+static void handle_untracked_files_arg(struct wt_status *s)
+{
+	if (!untracked_files_arg)
+		; /* default already initialized */
+	else if (!strcmp(untracked_files_arg, "no"))
+		s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
+	else if (!strcmp(untracked_files_arg, "normal"))
+		s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
+	else if (!strcmp(untracked_files_arg, "all"))
+		s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
+	/*
+	 * Please update $__git_untracked_file_modes in
+	 * git-completion.bash when you add new options
+	 */
+	else
+		die(_("Invalid untracked files mode '%s'"), untracked_files_arg);
+}
+
+static const char *read_commit_message(const char *name)
+{
+	const char *out_enc;
+	struct commit *commit;
+
+	commit = lookup_commit_reference_by_name(name);
+	if (!commit)
+		die(_("could not lookup commit '%s'"), name);
+	out_enc = get_commit_output_encoding();
+	return repo_logmsg_reencode(the_repository, commit, NULL, out_enc);
+}
+
+/*
+ * Enumerate what needs to be propagated when --porcelain
+ * is not in effect here.
+ */
+static struct status_deferred_config {
+	enum wt_status_format status_format;
+	int show_branch;
+	enum ahead_behind_flags ahead_behind;
+} status_deferred_config = {
+	STATUS_FORMAT_UNSPECIFIED,
+	-1, /* unspecified */
+	AHEAD_BEHIND_UNSPECIFIED,
+};
+
+static void finalize_deferred_config(struct wt_status *s)
+{
+	int use_deferred_config = (status_format != STATUS_FORMAT_PORCELAIN &&
+				   status_format != STATUS_FORMAT_PORCELAIN_V2 &&
+				   !s->null_termination);
+
+	if (s->null_termination) {
+		if (status_format == STATUS_FORMAT_NONE ||
+		    status_format == STATUS_FORMAT_UNSPECIFIED)
+			status_format = STATUS_FORMAT_PORCELAIN;
+		else if (status_format == STATUS_FORMAT_LONG)
+			die(_("options '%s' and '%s' cannot be used together"), "--long", "-z");
+	}
+
+	if (use_deferred_config && status_format == STATUS_FORMAT_UNSPECIFIED)
+		status_format = status_deferred_config.status_format;
+	if (status_format == STATUS_FORMAT_UNSPECIFIED)
+		status_format = STATUS_FORMAT_NONE;
+
+	if (use_deferred_config && s->show_branch < 0)
+		s->show_branch = status_deferred_config.show_branch;
+	if (s->show_branch < 0)
+		s->show_branch = 0;
+
+	/*
+	 * If the user did not give a "--[no]-ahead-behind" command
+	 * line argument *AND* we will print in a human-readable format
+	 * (short, long etc.) then we inherit from the status.aheadbehind
+	 * config setting.  In all other cases (and porcelain V[12] formats
+	 * in particular), we inherit _FULL for backwards compatibility.
+	 */
+	if (use_deferred_config &&
+	    s->ahead_behind_flags == AHEAD_BEHIND_UNSPECIFIED)
+		s->ahead_behind_flags = status_deferred_config.ahead_behind;
+
+	if (s->ahead_behind_flags == AHEAD_BEHIND_UNSPECIFIED)
+		s->ahead_behind_flags = AHEAD_BEHIND_FULL;
+}
+
+static void check_fixup_reword_options(int argc, const char *argv[]) {
+	if (whence != FROM_COMMIT) {
+		if (whence == FROM_MERGE)
+			die(_("You are in the middle of a merge -- cannot reword."));
+		else if (is_from_cherry_pick(whence))
+			die(_("You are in the middle of a cherry-pick -- cannot reword."));
+	}
+	if (argc)
+		die(_("reword option of '%s' and path '%s' cannot be used together"), "--fixup", *argv);
+	if (patch_interactive || interactive || all || also || only)
+		die(_("reword option of '%s' and '%s' cannot be used together"),
+			"--fixup", "--patch/--interactive/--all/--include/--only");
+}
+
+static int parse_and_validate_options(int argc, const char *argv[],
+				      const struct option *options,
+				      const char * const usage[],
+				      const char *prefix,
+				      struct commit *current_head,
+				      struct wt_status *s)
+{
+	argc = parse_options(argc, argv, prefix, options, usage, 0);
+	finalize_deferred_config(s);
+
+	if (force_author && !strchr(force_author, '>'))
+		force_author = find_author_by_nickname(force_author);
+
+	if (force_author && renew_authorship)
+		die(_("options '%s' and '%s' cannot be used together"), "--reset-author", "--author");
+
+	if (logfile || have_option_m || use_message)
+		use_editor = 0;
+
+	/* Sanity check options */
+	if (amend && !current_head)
+		die(_("You have nothing to amend."));
+	if (amend && whence != FROM_COMMIT) {
+		if (whence == FROM_MERGE)
+			die(_("You are in the middle of a merge -- cannot amend."));
+		else if (is_from_cherry_pick(whence))
+			die(_("You are in the middle of a cherry-pick -- cannot amend."));
+		else if (whence == FROM_REBASE_PICK)
+			die(_("You are in the middle of a rebase -- cannot amend."));
+	}
+	if (fixup_message && squash_message)
+		die(_("options '%s' and '%s' cannot be used together"), "--squash", "--fixup");
+	die_for_incompatible_opt4(!!use_message, "-C",
+				  !!edit_message, "-c",
+				  !!logfile, "-F",
+				  !!fixup_message, "--fixup");
+	die_for_incompatible_opt4(have_option_m, "-m",
+				  !!edit_message, "-c",
+				  !!use_message, "-C",
+				  !!logfile, "-F");
+	if (use_message || edit_message || logfile ||fixup_message || have_option_m)
+		template_file = NULL;
+	if (edit_message)
+		use_message = edit_message;
+	if (amend && !use_message && !fixup_message)
+		use_message = "HEAD";
+	if (!use_message && !is_from_cherry_pick(whence) &&
+	    !is_from_rebase(whence) && renew_authorship)
+		die(_("--reset-author can be used only with -C, -c or --amend."));
+	if (use_message) {
+		use_message_buffer = read_commit_message(use_message);
+		if (!renew_authorship) {
+			author_message = use_message;
+			author_message_buffer = use_message_buffer;
+		}
+	}
+	if ((is_from_cherry_pick(whence) || whence == FROM_REBASE_PICK) &&
+	    !renew_authorship) {
+		author_message = "CHERRY_PICK_HEAD";
+		author_message_buffer = read_commit_message(author_message);
+	}
+
+	if (patch_interactive)
+		interactive = 1;
+
+	die_for_incompatible_opt4(also, "-i/--include",
+				  only, "-o/--only",
+				  all, "-a/--all",
+				  interactive, "--interactive/-p/--patch");
+	if (fixup_message) {
+		/*
+		 * We limit --fixup's suboptions to only alpha characters.
+		 * If the first character after a run of alpha is colon,
+		 * then the part before the colon may be a known suboption
+		 * name like `amend` or `reword`, or a misspelt suboption
+		 * name. In either case, we treat it as
+		 * --fixup=<suboption>:<arg>.
+		 *
+		 * Otherwise, we are dealing with --fixup=<commit>.
+		 */
+		char *p = fixup_message;
+		while (isalpha(*p))
+			p++;
+		if (p > fixup_message && *p == ':') {
+			*p = '\0';
+			fixup_commit = p + 1;
+			if (!strcmp("amend", fixup_message) ||
+			    !strcmp("reword", fixup_message)) {
+				fixup_prefix = "amend";
+				allow_empty = 1;
+				if (*fixup_message == 'r') {
+					check_fixup_reword_options(argc, argv);
+					only = 1;
+				}
+			} else {
+				die(_("unknown option: --fixup=%s:%s"), fixup_message, fixup_commit);
+			}
+		} else {
+			fixup_commit = fixup_message;
+			fixup_prefix = "fixup";
+			use_editor = 0;
+		}
+	}
+
+	if (0 <= edit_flag)
+		use_editor = edit_flag;
+
+	cleanup_mode = get_cleanup_mode(cleanup_arg, use_editor);
+
+	handle_untracked_files_arg(s);
+
+	if (all && argc > 0)
+		die(_("paths '%s ...' with -a does not make sense"),
+		    argv[0]);
+
+	if (status_format != STATUS_FORMAT_NONE)
+		dry_run = 1;
+
+	return argc;
+}
+
+static int dry_run_commit(const char **argv, const char *prefix,
+			  const struct commit *current_head, struct wt_status *s)
+{
+	int committable;
+	const char *index_file;
+
+	index_file = prepare_index(argv, prefix, current_head, 1);
+	committable = run_status(stdout, index_file, prefix, 0, s);
+	rollback_index_files();
+
+	return committable ? 0 : 1;
+}
+
+define_list_config_array_extra(color_status_slots, {"added"});
+
+static int parse_status_slot(const char *slot)
+{
+	if (!strcasecmp(slot, "added"))
+		return WT_STATUS_UPDATED;
+
+	return LOOKUP_CONFIG(color_status_slots, slot);
+}
+
+static int git_status_config(const char *k, const char *v,
+			     const struct config_context *ctx, void *cb)
+{
+	struct wt_status *s = cb;
+	const char *slot_name;
+
+	if (starts_with(k, "column."))
+		return git_column_config(k, v, "status", &s->colopts);
+	if (!strcmp(k, "status.submodulesummary")) {
+		int is_bool;
+		s->submodule_summary = git_config_bool_or_int(k, v, ctx->kvi,
+							      &is_bool);
+		if (is_bool && s->submodule_summary)
+			s->submodule_summary = -1;
+		return 0;
+	}
+	if (!strcmp(k, "status.short")) {
+		if (git_config_bool(k, v))
+			status_deferred_config.status_format = STATUS_FORMAT_SHORT;
+		else
+			status_deferred_config.status_format = STATUS_FORMAT_NONE;
+		return 0;
+	}
+	if (!strcmp(k, "status.branch")) {
+		status_deferred_config.show_branch = git_config_bool(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.aheadbehind")) {
+		status_deferred_config.ahead_behind = git_config_bool(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.showstash")) {
+		s->show_stash = git_config_bool(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.color") || !strcmp(k, "color.status")) {
+		s->use_color = git_config_colorbool(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.displaycommentprefix")) {
+		s->display_comment_prefix = git_config_bool(k, v);
+		return 0;
+	}
+	if (skip_prefix(k, "status.color.", &slot_name) ||
+	    skip_prefix(k, "color.status.", &slot_name)) {
+		int slot = parse_status_slot(slot_name);
+		if (slot < 0)
+			return 0;
+		if (!v)
+			return config_error_nonbool(k);
+		return color_parse(v, s->color_palette[slot]);
+	}
+	if (!strcmp(k, "status.relativepaths")) {
+		s->relative_paths = git_config_bool(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.showuntrackedfiles")) {
+		if (!v)
+			return config_error_nonbool(k);
+		else if (!strcmp(v, "no"))
+			s->show_untracked_files = SHOW_NO_UNTRACKED_FILES;
+		else if (!strcmp(v, "normal"))
+			s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
+		else if (!strcmp(v, "all"))
+			s->show_untracked_files = SHOW_ALL_UNTRACKED_FILES;
+		else
+			return error(_("Invalid untracked files mode '%s'"), v);
+		return 0;
+	}
+	if (!strcmp(k, "diff.renamelimit")) {
+		if (s->rename_limit == -1)
+			s->rename_limit = git_config_int(k, v, ctx->kvi);
+		return 0;
+	}
+	if (!strcmp(k, "status.renamelimit")) {
+		s->rename_limit = git_config_int(k, v, ctx->kvi);
+		return 0;
+	}
+	if (!strcmp(k, "diff.renames")) {
+		if (s->detect_rename == -1)
+			s->detect_rename = git_config_rename(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.renames")) {
+		s->detect_rename = git_config_rename(k, v);
+		return 0;
+	}
+	return git_diff_ui_config(k, v, ctx, NULL);
+}
+
+int cmd_status(int argc, const char **argv, const char *prefix)
+{
+	static int no_renames = -1;
+	static const char *rename_score_arg = (const char *)-1;
+	static struct wt_status s;
+	unsigned int progress_flag = 0;
+	int fd;
+	struct object_id oid;
+	static struct option builtin_status_options[] = {
+		OPT__VERBOSE(&verbose, N_("be verbose")),
+		OPT_SET_INT('s', "short", &status_format,
+			    N_("show status concisely"), STATUS_FORMAT_SHORT),
+		OPT_BOOL('b', "branch", &s.show_branch,
+			 N_("show branch information")),
+		OPT_BOOL(0, "show-stash", &s.show_stash,
+			 N_("show stash information")),
+		OPT_BOOL(0, "ahead-behind", &s.ahead_behind_flags,
+			 N_("compute full ahead/behind values")),
+		OPT_CALLBACK_F(0, "porcelain", &status_format,
+		  N_("version"), N_("machine-readable output"),
+		  PARSE_OPT_OPTARG, opt_parse_porcelain),
+		OPT_SET_INT(0, "long", &status_format,
+			    N_("show status in long format (default)"),
+			    STATUS_FORMAT_LONG),
+		OPT_BOOL('z', "null", &s.null_termination,
+			 N_("terminate entries with NUL")),
+		{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg,
+		  N_("mode"),
+		  N_("show untracked files, optional modes: all, normal, no. (Default: all)"),
+		  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
+		{ OPTION_STRING, 0, "ignored", &ignored_arg,
+		  N_("mode"),
+		  N_("show ignored files, optional modes: traditional, matching, no. (Default: traditional)"),
+		  PARSE_OPT_OPTARG, NULL, (intptr_t)"traditional" },
+		{ OPTION_STRING, 0, "ignore-submodules", &ignore_submodule_arg, N_("when"),
+		  N_("ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)"),
+		  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
+		OPT_COLUMN(0, "column", &s.colopts, N_("list untracked files in columns")),
+		OPT_BOOL(0, "no-renames", &no_renames, N_("do not detect renames")),
+		OPT_CALLBACK_F('M', "find-renames", &rename_score_arg,
+		  N_("n"), N_("detect renames, optionally set similarity index"),
+		  PARSE_OPT_OPTARG | PARSE_OPT_NONEG, opt_parse_rename_score),
+		OPT_END(),
+	};
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_status_usage, builtin_status_options);
+
+	prepare_repo_settings(the_repository);
+	the_repository->settings.command_requires_full_index = 0;
+
+	status_init_config(&s, git_status_config);
+	argc = parse_options(argc, argv, prefix,
+			     builtin_status_options,
+			     builtin_status_usage, 0);
+	finalize_colopts(&s.colopts, -1);
+	finalize_deferred_config(&s);
+
+	handle_untracked_files_arg(&s);
+	handle_ignored_arg(&s);
+
+	if (s.show_ignored_mode == SHOW_MATCHING_IGNORED &&
+	    s.show_untracked_files == SHOW_NO_UNTRACKED_FILES)
+		die(_("Unsupported combination of ignored and untracked-files arguments"));
+
+	parse_pathspec(&s.pathspec, 0,
+		       PATHSPEC_PREFER_FULL,
+		       prefix, argv);
+
+	if (status_format != STATUS_FORMAT_PORCELAIN &&
+	    status_format != STATUS_FORMAT_PORCELAIN_V2)
+		progress_flag = REFRESH_PROGRESS;
+	repo_read_index(the_repository);
+	refresh_index(&the_index,
+		      REFRESH_QUIET|REFRESH_UNMERGED|progress_flag,
+		      &s.pathspec, NULL, NULL);
+
+	if (use_optional_locks())
+		fd = repo_hold_locked_index(the_repository, &index_lock, 0);
+	else
+		fd = -1;
+
+	s.is_initial = repo_get_oid(the_repository, s.reference, &oid) ? 1 : 0;
+	if (!s.is_initial)
+		oidcpy(&s.oid_commit, &oid);
+
+	s.ignore_submodule_arg = ignore_submodule_arg;
+	s.status_format = status_format;
+	s.verbose = verbose;
+	if (no_renames != -1)
+		s.detect_rename = !no_renames;
+	if ((intptr_t)rename_score_arg != -1) {
+		if (s.detect_rename < DIFF_DETECT_RENAME)
+			s.detect_rename = DIFF_DETECT_RENAME;
+		if (rename_score_arg)
+			s.rename_score = parse_rename_score(&rename_score_arg);
+	}
+
+	wt_status_collect(&s);
+
+	if (0 <= fd)
+		repo_update_index_if_able(the_repository, &index_lock);
+
+	if (s.relative_paths)
+		s.prefix = prefix;
+
+	wt_status_print(&s);
+	wt_status_collect_free_buffers(&s);
+
+	return 0;
+}
+
+static int git_commit_config(const char *k, const char *v,
+			     const struct config_context *ctx, void *cb)
+{
+	struct wt_status *s = cb;
+
+	if (!strcmp(k, "commit.template"))
+		return git_config_pathname(&template_file, k, v);
+	if (!strcmp(k, "commit.status")) {
+		include_status = git_config_bool(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "commit.cleanup"))
+		return git_config_string(&cleanup_arg, k, v);
+	if (!strcmp(k, "commit.gpgsign")) {
+		sign_commit = git_config_bool(k, v) ? "" : NULL;
+		return 0;
+	}
+	if (!strcmp(k, "commit.verbose")) {
+		int is_bool;
+		config_commit_verbose = git_config_bool_or_int(k, v, ctx->kvi,
+							       &is_bool);
+		return 0;
+	}
+
+	return git_status_config(k, v, ctx, s);
+}
+
+int cmd_commit(int argc, const char **argv, const char *prefix)
+{
+	static struct wt_status s;
+	static struct option builtin_commit_options[] = {
+		OPT__QUIET(&quiet, N_("suppress summary after successful commit")),
+		OPT__VERBOSE(&verbose, N_("show diff in commit message template")),
+
+		OPT_GROUP(N_("Commit message options")),
+		OPT_FILENAME('F', "file", &logfile, N_("read message from file")),
+		OPT_STRING(0, "author", &force_author, N_("author"), N_("override author for commit")),
+		OPT_STRING(0, "date", &force_date, N_("date"), N_("override date for commit")),
+		OPT_CALLBACK('m', "message", &message, N_("message"), N_("commit message"), opt_parse_m),
+		OPT_STRING('c', "reedit-message", &edit_message, N_("commit"), N_("reuse and edit message from specified commit")),
+		OPT_STRING('C', "reuse-message", &use_message, N_("commit"), N_("reuse message from specified commit")),
+		/*
+		 * TRANSLATORS: Leave "[(amend|reword):]" as-is,
+		 * and only translate <commit>.
+		 */
+		OPT_STRING(0, "fixup", &fixup_message, N_("[(amend|reword):]commit"), N_("use autosquash formatted message to fixup or amend/reword specified commit")),
+		OPT_STRING(0, "squash", &squash_message, N_("commit"), N_("use autosquash formatted message to squash specified commit")),
+		OPT_BOOL(0, "reset-author", &renew_authorship, N_("the commit is authored by me now (used with -C/-c/--amend)")),
+		OPT_CALLBACK_F(0, "trailer", &trailer_args, N_("trailer"), N_("add custom trailer(s)"), PARSE_OPT_NONEG, opt_pass_trailer),
+		OPT_BOOL('s', "signoff", &signoff, N_("add a Signed-off-by trailer")),
+		OPT_FILENAME('t', "template", &template_file, N_("use specified template file")),
+		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of commit")),
+		OPT_CLEANUP(&cleanup_arg),
+		OPT_BOOL(0, "status", &include_status, N_("include status in commit message template")),
+		{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"),
+		  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
+		/* end commit message options */
+
+		OPT_GROUP(N_("Commit contents options")),
+		OPT_BOOL('a', "all", &all, N_("commit all changed files")),
+		OPT_BOOL('i', "include", &also, N_("add specified files to index for commit")),
+		OPT_BOOL(0, "interactive", &interactive, N_("interactively add files")),
+		OPT_BOOL('p', "patch", &patch_interactive, N_("interactively add changes")),
+		OPT_BOOL('o', "only", &only, N_("commit only specified files")),
+		OPT_BOOL('n', "no-verify", &no_verify, N_("bypass pre-commit and commit-msg hooks")),
+		OPT_BOOL(0, "dry-run", &dry_run, N_("show what would be committed")),
+		OPT_SET_INT(0, "short", &status_format, N_("show status concisely"),
+			    STATUS_FORMAT_SHORT),
+		OPT_BOOL(0, "branch", &s.show_branch, N_("show branch information")),
+		OPT_BOOL(0, "ahead-behind", &s.ahead_behind_flags,
+			 N_("compute full ahead/behind values")),
+		OPT_SET_INT(0, "porcelain", &status_format,
+			    N_("machine-readable output"), STATUS_FORMAT_PORCELAIN),
+		OPT_SET_INT(0, "long", &status_format,
+			    N_("show status in long format (default)"),
+			    STATUS_FORMAT_LONG),
+		OPT_BOOL('z', "null", &s.null_termination,
+			 N_("terminate entries with NUL")),
+		OPT_BOOL(0, "amend", &amend, N_("amend previous commit")),
+		OPT_BOOL(0, "no-post-rewrite", &no_post_rewrite, N_("bypass post-rewrite hook")),
+		{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, N_("mode"), N_("show untracked files, optional modes: all, normal, no. (Default: all)"), PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
+		OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
+		OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
+		/* end commit contents options */
+
+		OPT_HIDDEN_BOOL(0, "allow-empty", &allow_empty,
+				N_("ok to record an empty change")),
+		OPT_HIDDEN_BOOL(0, "allow-empty-message", &allow_empty_message,
+				N_("ok to record a change with an empty message")),
+
+		OPT_END()
+	};
+
+	struct strbuf sb = STRBUF_INIT;
+	struct strbuf author_ident = STRBUF_INIT;
+	const char *index_file, *reflog_msg;
+	struct object_id oid;
+	struct commit_list *parents = NULL;
+	struct stat statbuf;
+	struct commit *current_head = NULL;
+	struct commit_extra_header *extra = NULL;
+	struct strbuf err = STRBUF_INIT;
+	int ret = 0;
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_commit_usage, builtin_commit_options);
+
+	prepare_repo_settings(the_repository);
+	the_repository->settings.command_requires_full_index = 0;
+
+	status_init_config(&s, git_commit_config);
+	s.commit_template = 1;
+	status_format = STATUS_FORMAT_NONE; /* Ignore status.short */
+	s.colopts = 0;
+
+	if (repo_get_oid(the_repository, "HEAD", &oid))
+		current_head = NULL;
+	else {
+		current_head = lookup_commit_or_die(&oid, "HEAD");
+		if (repo_parse_commit(the_repository, current_head))
+			die(_("could not parse HEAD commit"));
+	}
+	verbose = -1; /* unspecified */
+	argc = parse_and_validate_options(argc, argv, builtin_commit_options,
+					  builtin_commit_usage,
+					  prefix, current_head, &s);
+	if (verbose == -1)
+		verbose = (config_commit_verbose < 0) ? 0 : config_commit_verbose;
+
+	if (dry_run)
+		return dry_run_commit(argv, prefix, current_head, &s);
+	index_file = prepare_index(argv, prefix, current_head, 0);
+
+	/* Set up everything for writing the commit object.  This includes
+	   running hooks, writing the trees, and interacting with the user.  */
+	if (!prepare_to_commit(index_file, prefix,
+			       current_head, &s, &author_ident)) {
+		ret = 1;
+		rollback_index_files();
+		goto cleanup;
+	}
+
+	/* Determine parents */
+	reflog_msg = getenv("GIT_REFLOG_ACTION");
+	if (!current_head) {
+		if (!reflog_msg)
+			reflog_msg = "commit (initial)";
+	} else if (amend) {
+		if (!reflog_msg)
+			reflog_msg = "commit (amend)";
+		parents = copy_commit_list(current_head->parents);
+	} else if (whence == FROM_MERGE) {
+		struct strbuf m = STRBUF_INIT;
+		FILE *fp;
+		int allow_fast_forward = 1;
+		struct commit_list **pptr = &parents;
+
+		if (!reflog_msg)
+			reflog_msg = "commit (merge)";
+		pptr = commit_list_append(current_head, pptr);
+		fp = xfopen(git_path_merge_head(the_repository), "r");
+		while (strbuf_getline_lf(&m, fp) != EOF) {
+			struct commit *parent;
+
+			parent = get_merge_parent(m.buf);
+			if (!parent)
+				die(_("Corrupt MERGE_HEAD file (%s)"), m.buf);
+			pptr = commit_list_append(parent, pptr);
+		}
+		fclose(fp);
+		strbuf_release(&m);
+		if (!stat(git_path_merge_mode(the_repository), &statbuf)) {
+			if (strbuf_read_file(&sb, git_path_merge_mode(the_repository), 0) < 0)
+				die_errno(_("could not read MERGE_MODE"));
+			if (!strcmp(sb.buf, "no-ff"))
+				allow_fast_forward = 0;
+		}
+		if (allow_fast_forward)
+			reduce_heads_replace(&parents);
+	} else {
+		if (!reflog_msg)
+			reflog_msg = is_from_cherry_pick(whence)
+					? "commit (cherry-pick)"
+					: is_from_rebase(whence)
+					? "commit (rebase)"
+					: "commit";
+		commit_list_insert(current_head, &parents);
+	}
+
+	/* Finally, get the commit message */
+	strbuf_reset(&sb);
+	if (strbuf_read_file(&sb, git_path_commit_editmsg(), 0) < 0) {
+		int saved_errno = errno;
+		rollback_index_files();
+		die(_("could not read commit message: %s"), strerror(saved_errno));
+	}
+
+	cleanup_message(&sb, cleanup_mode, verbose);
+
+	if (message_is_empty(&sb, cleanup_mode) && !allow_empty_message) {
+		rollback_index_files();
+		fprintf(stderr, _("Aborting commit due to empty commit message.\n"));
+		exit(1);
+	}
+	if (template_untouched(&sb, template_file, cleanup_mode) && !allow_empty_message) {
+		rollback_index_files();
+		fprintf(stderr, _("Aborting commit; you did not edit the message.\n"));
+		exit(1);
+	}
+
+	if (fixup_message && starts_with(sb.buf, "amend! ") &&
+	    !allow_empty_message) {
+		struct strbuf body = STRBUF_INIT;
+		size_t len = commit_subject_length(sb.buf);
+		strbuf_addstr(&body, sb.buf + len);
+		if (message_is_empty(&body, cleanup_mode)) {
+			rollback_index_files();
+			fprintf(stderr, _("Aborting commit due to empty commit message body.\n"));
+			exit(1);
+		}
+		strbuf_release(&body);
+	}
+
+	if (amend) {
+		const char *exclude_gpgsig[3] = { "gpgsig", "gpgsig-sha256", NULL };
+		extra = read_commit_extra_headers(current_head, exclude_gpgsig);
+	} else {
+		struct commit_extra_header **tail = &extra;
+		append_merge_tag_headers(parents, &tail);
+	}
+
+	if (commit_tree_extended(sb.buf, sb.len, &the_index.cache_tree->oid,
+				 parents, &oid, author_ident.buf, NULL,
+				 sign_commit, extra)) {
+		rollback_index_files();
+		die(_("failed to write commit object"));
+	}
+	free_commit_extra_headers(extra);
+
+	if (update_head_with_reflog(current_head, &oid, reflog_msg, &sb,
+				    &err)) {
+		rollback_index_files();
+		die("%s", err.buf);
+	}
+
+	sequencer_post_commit_cleanup(the_repository, 0);
+	unlink(git_path_merge_head(the_repository));
+	unlink(git_path_merge_msg(the_repository));
+	unlink(git_path_merge_mode(the_repository));
+	unlink(git_path_squash_msg(the_repository));
+
+	if (commit_index_files())
+		die(_("repository has been updated, but unable to write\n"
+		      "new index file. Check that disk is not full and quota is\n"
+		      "not exceeded, and then \"git restore --staged :/\" to recover."));
+
+	git_test_write_commit_graph_or_die();
+
+	repo_rerere(the_repository, 0);
+	run_auto_maintenance(quiet);
+	run_commit_hook(use_editor, get_index_file(), NULL, "post-commit",
+			NULL);
+	if (amend && !no_post_rewrite) {
+		commit_post_rewrite(the_repository, current_head, &oid);
+	}
+	if (!quiet) {
+		unsigned int flags = 0;
+
+		if (!current_head)
+			flags |= SUMMARY_INITIAL_COMMIT;
+		if (author_date_is_interesting())
+			flags |= SUMMARY_SHOW_AUTHOR_DATE;
+		print_commit_summary(the_repository, prefix,
+				     &oid, flags);
+	}
+
+	apply_autostash(git_path_merge_autostash(the_repository));
+
+cleanup:
+	strbuf_release(&author_ident);
+	strbuf_release(&err);
+	strbuf_release(&sb);
+	return ret;
+}