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/*
 * Builtin "git commit"
 *
 * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>
 * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
 */

#include "cache.h"
#include "cache-tree.h"
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#include "color.h"
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#include "dir.h"
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#include "builtin.h"
#include "diff.h"
#include "diffcore.h"
#include "commit.h"
#include "revision.h"
#include "wt-status.h"
#include "run-command.h"
#include "refs.h"
#include "log-tree.h"
#include "strbuf.h"
#include "utf8.h"
#include "parse-options.h"
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#include "string-list.h"
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#include "rerere.h"
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#include "unpack-trees.h"
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#include "quote.h"
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#include "submodule.h"
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static const char * const builtin_commit_usage[] = {
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	"git commit [options] [--] <filepattern>...",
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	NULL
};

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static const char * const builtin_status_usage[] = {
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	"git status [options] [--] <filepattern>...",
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	NULL
};

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static const char implicit_ident_advice[] =
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N_("Your name and email address were configured automatically based\n"
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"on your username and hostname. Please check that they are accurate.\n"
"You can suppress this message by setting them explicitly:\n"
"\n"
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"    git config --global user.name \"Your Name\"\n"
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"    git config --global user.email you@example.com\n"
"\n"
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"After doing this, you may fix the identity used for this commit with:\n"
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"\n"
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"    git commit --amend --reset-author\n");
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static const char empty_amend_advice[] =
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N_("You asked to amend the most recent commit, but doing so would make\n"
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"it empty. You can repeat your command with --allow-empty, or you can\n"
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"remove the commit entirely with \"git reset HEAD^\".\n");
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static const char empty_cherry_pick_advice[] =
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N_("The previous cherry-pick is now empty, possibly due to conflict resolution.\n"
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"If you wish to commit it anyway, use:\n"
"\n"
"    git commit --allow-empty\n"
"\n"
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"Otherwise, please use 'git reset'\n");
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static unsigned char head_sha1[20];
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static const char *use_message_buffer;
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static const char commit_editmsg[] = "COMMIT_EDITMSG";
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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,
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	COMMIT_PARTIAL
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} commit_style;
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static const char *logfile, *force_author;
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static const char *template_file;
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/*
 * The _message variables are commit names from which to take
 * the commit message and/or authorship.
 */
static const char *author_message, *author_message_buffer;
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static char *edit_message, *use_message;
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static char *fixup_message, *squash_message;
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static int all, edit_flag, also, interactive, patch_interactive, only, amend, signoff;
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static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
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static int no_post_rewrite, allow_empty_message;
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static char *untracked_files_arg, *force_date, *ignore_submodule_arg;
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/*
 * 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 {
	CLEANUP_SPACE,
	CLEANUP_NONE,
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	CLEANUP_ALL
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} cleanup_mode;
static char *cleanup_arg;
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static enum commit_whence whence;
static int use_editor = 1, initial_commit, include_status = 1;
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static int show_ignored_in_status;
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static const char *only_include_assumed;
static struct strbuf message;
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static int null_termination;
static enum {
	STATUS_FORMAT_LONG,
	STATUS_FORMAT_SHORT,
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	STATUS_FORMAT_PORCELAIN
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} status_format = STATUS_FORMAT_LONG;
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static int status_show_branch;
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static int opt_parse_m(const struct option *opt, const char *arg, int unset)
{
	struct strbuf *buf = opt->value;
	if (unset)
		strbuf_setlen(buf, 0);
	else {
		strbuf_addstr(buf, arg);
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		strbuf_addstr(buf, "\n\n");
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	}
	return 0;
}
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static struct option builtin_commit_options[] = {
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	OPT__QUIET(&quiet, "suppress summary after successful commit"),
	OPT__VERBOSE(&verbose, "show diff in commit message template"),
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	OPT_GROUP("Commit message options"),
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	OPT_FILENAME('F', "file", &logfile, "read message from file"),
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	OPT_STRING(0, "author", &force_author, "author", "override author for commit"),
	OPT_STRING(0, "date", &force_date, "date", "override date for commit"),
	OPT_CALLBACK('m', "message", &message, "message", "commit message", opt_parse_m),
	OPT_STRING('c', "reedit-message", &edit_message, "commit", "reuse and edit message from specified commit"),
	OPT_STRING('C', "reuse-message", &use_message, "commit", "reuse message from specified commit"),
	OPT_STRING(0, "fixup", &fixup_message, "commit", "use autosquash formatted message to fixup specified commit"),
	OPT_STRING(0, "squash", &squash_message, "commit", "use autosquash formatted message to squash specified commit"),
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	OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C-c/--amend)"),
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	OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
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	OPT_FILENAME('t', "template", &template_file, "use specified template file"),
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	OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
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	OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
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	OPT_BOOLEAN(0, "status", &include_status, "include status in commit message template"),
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	/* end commit message options */
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	OPT_GROUP("Commit contents options"),
	OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
	OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
	OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
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	OPT_BOOLEAN('p', "patch", &patch_interactive, "interactively add changes"),
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	OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
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	OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
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	OPT_BOOLEAN(0, "dry-run", &dry_run, "show what would be committed"),
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	OPT_SET_INT(0, "short", &status_format, "show status concisely",
		    STATUS_FORMAT_SHORT),
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	OPT_BOOLEAN(0, "branch", &status_show_branch, "show branch information"),
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	OPT_SET_INT(0, "porcelain", &status_format,
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		    "machine-readable output", STATUS_FORMAT_PORCELAIN),
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	OPT_BOOLEAN('z', "null", &null_termination,
		    "terminate entries with NUL"),
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	OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
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	OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, "bypass post-rewrite hook"),
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	{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, "mode", "show untracked files, optional modes: all, normal, no. (Default: all)", PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
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	/* end commit contents options */
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	{ OPTION_BOOLEAN, 0, "allow-empty", &allow_empty, NULL,
	  "ok to record an empty change",
	  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
	{ OPTION_BOOLEAN, 0, "allow-empty-message", &allow_empty_message, NULL,
	  "ok to record a change with an empty message",
	  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },

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	OPT_END()
};

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static void determine_whence(struct wt_status *s)
{
	if (file_exists(git_path("MERGE_HEAD")))
		whence = FROM_MERGE;
	else if (file_exists(git_path("CHERRY_PICK_HEAD")))
		whence = FROM_CHERRY_PICK;
	else
		whence = FROM_COMMIT;
	if (s)
		s->whence = whence;
}

static const char *whence_s(void)
{
	char *s = "";

	switch (whence) {
	case FROM_COMMIT:
		break;
	case FROM_MERGE:
		s = "merge";
		break;
	case FROM_CHERRY_PICK:
		s = "cherry-pick";
		break;
	}

	return s;
}

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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;
	}
}

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static int commit_index_files(void)
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{
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	int err = 0;

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	switch (commit_style) {
	case COMMIT_AS_IS:
		break; /* nothing to do */
	case COMMIT_NORMAL:
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		err = commit_lock_file(&index_lock);
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		break;
	case COMMIT_PARTIAL:
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		err = commit_lock_file(&index_lock);
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		rollback_lock_file(&false_lock);
		break;
	}
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	return err;
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}

/*
 * 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.
 */
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static int list_paths(struct string_list *list, const char *with_tree,
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		      const char *prefix, const char **pattern)
{
	int i;
	char *m;

	for (i = 0; pattern[i]; i++)
		;
	m = xcalloc(1, i);

	if (with_tree)
		overlay_tree_on_cache(with_tree, prefix);

	for (i = 0; i < active_nr; i++) {
		struct cache_entry *ce = active_cache[i];
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		struct string_list_item *item;

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		if (ce->ce_flags & CE_UPDATE)
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			continue;
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		if (!match_pathspec(pattern, ce->name, ce_namelen(ce), 0, m))
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			continue;
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		item = string_list_insert(list, ce->name);
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		if (ce_skip_worktree(ce))
			item->util = item; /* better a valid pointer than a fake one */
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	}

	return report_path_error(m, pattern, prefix ? strlen(prefix) : 0);
}

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static void add_remove_files(struct string_list *list)
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{
	int i;
	for (i = 0; i < list->nr; i++) {
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		struct stat st;
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		struct string_list_item *p = &(list->items[i]);
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		/* p->util is skip-worktree */
		if (p->util)
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			continue;
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		if (!lstat(p->string, &st)) {
			if (add_to_cache(p->string, &st, 0))
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				die(_("updating files failed"));
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		} else
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			remove_file_from_cache(p->string);
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	}
}

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static void create_base_index(void)
{
	struct tree *tree;
	struct unpack_trees_options opts;
	struct tree_desc t;

	if (initial_commit) {
		discard_cache();
		return;
	}

	memset(&opts, 0, sizeof(opts));
	opts.head_idx = 1;
	opts.index_only = 1;
	opts.merge = 1;
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	opts.src_index = &the_index;
	opts.dst_index = &the_index;
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	opts.fn = oneway_merge;
	tree = parse_tree_indirect(head_sha1);
	if (!tree)
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		die(_("failed to unpack HEAD tree object"));
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	parse_tree(tree);
	init_tree_desc(&t, tree->buffer, tree->size);
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	if (unpack_trees(1, &t, &opts))
		exit(128); /* We've already reported the error, finish dying */
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}

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static void refresh_cache_or_die(int refresh_flags)
{
	/*
	 * refresh_flags contains REFRESH_QUIET, so the only errors
	 * are for unmerged entries.
	 */
	if (refresh_cache(refresh_flags | REFRESH_IN_PORCELAIN))
		die_resolve_conflict("commit");
}

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static char *prepare_index(int argc, const char **argv, const char *prefix, int is_status)
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{
	int fd;
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	struct string_list partial;
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	const char **pathspec = NULL;
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	char *old_index_env = NULL;
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	int refresh_flags = REFRESH_QUIET;
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	if (is_status)
		refresh_flags |= REFRESH_UNMERGED;
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	if (*argv)
		pathspec = get_pathspec(prefix, argv);
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	if (read_cache_preload(pathspec) < 0)
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		die(_("index file corrupt"));
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	if (interactive) {
		fd = hold_locked_index(&index_lock, 1);

		refresh_cache_or_die(refresh_flags);

		if (write_cache(fd, active_cache, active_nr) ||
		    close_lock_file(&index_lock))
			die(_("unable to create temporary index"));

		old_index_env = getenv(INDEX_ENVIRONMENT);
		setenv(INDEX_ENVIRONMENT, index_lock.filename, 1);

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		if (interactive_add(argc, argv, prefix, patch_interactive) != 0)
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			die(_("interactive add failed"));

		if (old_index_env && *old_index_env)
			setenv(INDEX_ENVIRONMENT, old_index_env, 1);
		else
			unsetenv(INDEX_ENVIRONMENT);

		discard_cache();
		read_cache_from(index_lock.filename);

		commit_style = COMMIT_NORMAL;
		return index_lock.filename;
	}

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	/*
	 * 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 && *pathspec)) {
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		fd = hold_locked_index(&index_lock, 1);
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		add_files_to_cache(also ? prefix : NULL, pathspec, 0);
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		refresh_cache_or_die(refresh_flags);
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		if (write_cache(fd, active_cache, active_nr) ||
		    close_lock_file(&index_lock))
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			die(_("unable to write new_index file"));
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		commit_style = COMMIT_NORMAL;
		return index_lock.filename;
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	}

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	/*
	 * As-is commit.
	 *
	 * (1) return the name of the real index file.
	 *
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	 * The caller should run hooks on the real index,
	 * and create commit from the_index.
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	 * We still need to refresh the index here.
	 */
	if (!pathspec || !*pathspec) {
		fd = hold_locked_index(&index_lock, 1);
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		refresh_cache_or_die(refresh_flags);
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		if (active_cache_changed) {
			if (write_cache(fd, active_cache, active_nr) ||
			    commit_locked_index(&index_lock))
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				die(_("unable to write new_index file"));
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		} else {
			rollback_lock_file(&index_lock);
		}
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		commit_style = COMMIT_AS_IS;
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		return get_index_file();
	}

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	/*
	 * 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;

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	if (whence != FROM_COMMIT)
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		die(_("cannot do a partial commit during a %s."), whence_s());
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	memset(&partial, 0, sizeof(partial));
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	partial.strdup_strings = 1;
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	if (list_paths(&partial, initial_commit ? NULL : "HEAD", prefix, pathspec))
		exit(1);

	discard_cache();
	if (read_cache() < 0)
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		die(_("cannot read the index"));
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	fd = hold_locked_index(&index_lock, 1);
	add_remove_files(&partial);
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	refresh_cache(REFRESH_QUIET);
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	if (write_cache(fd, active_cache, active_nr) ||
	    close_lock_file(&index_lock))
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		die(_("unable to write new_index file"));
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	fd = hold_lock_file_for_update(&false_lock,
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				       git_path("next-index-%"PRIuMAX,
						(uintmax_t) getpid()),
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				       LOCK_DIE_ON_ERROR);
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	create_base_index();
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	add_remove_files(&partial);
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	refresh_cache(REFRESH_QUIET);
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	if (write_cache(fd, active_cache, active_nr) ||
	    close_lock_file(&false_lock))
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		die(_("unable to write temporary index file"));
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	discard_cache();
	read_cache_from(false_lock.filename);

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	return false_lock.filename;
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}

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static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
		      struct wt_status *s)
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{
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	unsigned char sha1[20];

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	if (s->relative_paths)
		s->prefix = prefix;
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	if (amend) {
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		s->amend = 1;
		s->reference = "HEAD^1";
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	}
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	s->verbose = verbose;
	s->index_file = index_file;
	s->fp = fp;
	s->nowarn = nowarn;
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	s->is_initial = get_sha1(s->reference, sha1) ? 1 : 0;
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	wt_status_collect(s);
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	switch (status_format) {
	case STATUS_FORMAT_SHORT:
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		wt_shortstatus_print(s, null_termination, status_show_branch);
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		break;
	case STATUS_FORMAT_PORCELAIN:
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		wt_porcelain_print(s, null_termination);
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		break;
	case STATUS_FORMAT_LONG:
		wt_status_print(s);
		break;
	}
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	return s->commitable;
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}

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static int is_a_merge(const unsigned char *sha1)
{
	struct commit *commit = lookup_commit(sha1);
	if (!commit || parse_commit(commit))
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		die(_("could not parse HEAD commit"));
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	return !!(commit->parents && commit->parents->next);
}

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static const char sign_off_header[] = "Signed-off-by: ";

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static void determine_author_info(struct strbuf *author_ident)
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{
	char *name, *email, *date;

	name = getenv("GIT_AUTHOR_NAME");
	email = getenv("GIT_AUTHOR_EMAIL");
	date = getenv("GIT_AUTHOR_DATE");

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	if (author_message) {
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		const char *a, *lb, *rb, *eol;

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		a = strstr(author_message_buffer, "\nauthor ");
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		if (!a)
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			die(_("invalid commit: %s"), author_message);
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		lb = strchrnul(a + strlen("\nauthor "), '<');
		rb = strchrnul(lb, '>');
		eol = strchrnul(rb, '\n');
		if (!*lb || !*rb || !*eol)
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			die(_("invalid commit: %s"), author_message);
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		if (lb == a + strlen("\nauthor "))
			/* \nauthor <foo@example.com> */
			name = xcalloc(1, 1);
		else
			name = xmemdupz(a + strlen("\nauthor "),
					(lb - strlen(" ") -
					 (a + strlen("\nauthor "))));
		email = xmemdupz(lb + strlen("<"), rb - (lb + strlen("<")));
		date = xmemdupz(rb + strlen("> "), eol - (rb + strlen("> ")));
559 560 561 562 563 564 565
	}

	if (force_author) {
		const char *lb = strstr(force_author, " <");
		const char *rb = strchr(force_author, '>');

		if (!lb || !rb)
566
			die(_("malformed --author parameter"));
567 568 569 570
		name = xstrndup(force_author, lb - force_author);
		email = xstrndup(lb + 2, rb - (lb + 2));
	}

571 572
	if (force_date)
		date = force_date;
573 574
	strbuf_addstr(author_ident, fmt_ident(name, email, date,
					      IDENT_ERROR_ON_NO_NAME));
575 576
}

577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
static int ends_rfc2822_footer(struct strbuf *sb)
{
	int ch;
	int hit = 0;
	int i, j, k;
	int len = sb->len;
	int first = 1;
	const char *buf = sb->buf;

	for (i = len - 1; i > 0; i--) {
		if (hit && buf[i] == '\n')
			break;
		hit = (buf[i] == '\n');
	}

	while (i < len - 1 && buf[i] == '\n')
		i++;

	for (; i < len; i = k) {
		for (k = i; k < len && buf[k] != '\n'; k++)
			; /* do nothing */
		k++;

		if ((buf[k] == ' ' || buf[k] == '\t') && !first)
			continue;

		first = 0;

		for (j = 0; i + j < len; j++) {
			ch = buf[i + j];
			if (ch == ':')
				break;
			if (isalnum(ch) ||
			    (ch == '-'))
				continue;
			return 0;
		}
	}
	return 1;
}

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static char *cut_ident_timestamp_part(char *string)
{
	char *ket = strrchr(string, '>');
	if (!ket || ket[1] != ' ')
622
		die(_("Malformed ident string: '%s'"), string);
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	*++ket = '\0';
	return ket;
}

627
static int prepare_to_commit(const char *index_file, const char *prefix,
628 629
			     struct wt_status *s,
			     struct strbuf *author_ident)
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{
	struct stat statbuf;
632
	struct strbuf committer_ident = STRBUF_INIT;
633
	int commitable, saved_color_setting;
634
	struct strbuf sb = STRBUF_INIT;
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	char *buffer;
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	const char *hook_arg1 = NULL;
	const char *hook_arg2 = NULL;
638
	int ident_shown = 0;
639
	int clean_message_contents = (cleanup_mode != CLEANUP_NONE);
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	if (!no_verify && run_hook(index_file, "pre-commit", NULL))
		return 0;
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	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)
656
				die(_("could not lookup commit %s"), squash_message);
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			ctx.output_encoding = get_commit_output_encoding();
			format_commit_message(c, "squash! %s\n\n", &sb,
					      &ctx);
		}
	}

663 664
	if (message.len) {
		strbuf_addbuf(&sb, &message);
665
		hook_arg1 = "message";
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	} else if (logfile && !strcmp(logfile, "-")) {
		if (isatty(0))
668
			fprintf(stderr, _("(reading log message from standard input)\n"));
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		if (strbuf_read(&sb, 0, 0) < 0)
670
			die_errno(_("could not read log from standard input"));
671
		hook_arg1 = "message";
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	} else if (logfile) {
		if (strbuf_read_file(&sb, logfile, 0) < 0)
674
			die_errno(_("could not read log file '%s'"),
675
				  logfile);
676
		hook_arg1 = "message";
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	} else if (use_message) {
		buffer = strstr(use_message_buffer, "\n\n");
		if (!buffer || buffer[2] == '\0')
680
			die(_("commit has empty message"));
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		strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
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		hook_arg1 = "commit";
		hook_arg2 = use_message;
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	} else if (fixup_message) {
		struct pretty_print_context ctx = {0};
		struct commit *commit;
		commit = lookup_commit_reference_by_name(fixup_message);
		if (!commit)
689
			die(_("could not lookup commit %s"), fixup_message);
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		ctx.output_encoding = get_commit_output_encoding();
		format_commit_message(commit, "fixup! %s\n\n",
				      &sb, &ctx);
		hook_arg1 = "message";
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	} else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
		if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
696
			die_errno(_("could not read MERGE_MSG"));
697
		hook_arg1 = "merge";
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	} else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
		if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
700
			die_errno(_("could not read SQUASH_MSG"));
701
		hook_arg1 = "squash";
702
	} else if (template_file) {
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703
		if (strbuf_read_file(&sb, template_file, 0) < 0)
704
			die_errno(_("could not read '%s'"), template_file);
705
		hook_arg1 = "template";
706
		clean_message_contents = 0;
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	}

709
	/*
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	 * The remaining cases don't modify the template message, but
	 * just set the argument(s) to the prepare-commit-msg hook.
712
	 */
713
	else if (whence == FROM_MERGE)
714
		hook_arg1 = "merge";
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	else if (whence == FROM_CHERRY_PICK) {
		hook_arg1 = "commit";
		hook_arg2 = "CHERRY_PICK_HEAD";
	}
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	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 = "";
	}

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	s->fp = fopen(git_path(commit_editmsg), "w");
	if (s->fp == NULL)
732
		die_errno(_("could not open '%s'"), git_path(commit_editmsg));
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734
	if (clean_message_contents)
735
		stripspace(&sb, 0);
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	if (signoff) {
738
		struct strbuf sob = STRBUF_INIT;
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		int i;

		strbuf_addstr(&sob, sign_off_header);
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		strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
					     getenv("GIT_COMMITTER_EMAIL")));
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		strbuf_addch(&sob, '\n');
		for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
			; /* do nothing */
747
		if (prefixcmp(sb.buf + i, sob.buf)) {
748
			if (!i || !ends_rfc2822_footer(&sb))
749
				strbuf_addch(&sb, '\n');
750
			strbuf_addbuf(&sb, &sob);
751
		}
752
		strbuf_release(&sob);
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	}

755
	if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
756
		die_errno(_("could not write commit template"));
757

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	strbuf_release(&sb);

760 761
	/* This checks and barfs if author is badly specified */
	determine_author_info(author_ident);
762

763
	/* This checks if committer ident is explicitly given */
764
	strbuf_addstr(&committer_ident, git_committer_info(0));
765
	if (use_editor && include_status) {
766
		char *ai_tmp, *ci_tmp;
767
		if (whence != FROM_COMMIT)
768
			status_printf_ln(s, GIT_COLOR_NORMAL,
769
				_("\n"
770
				"It looks like you may be committing a %s.\n"
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				"If this is not correct, please remove the file\n"
				"	%s\n"
				"and try again.\n"
774
				""),
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				whence_s(),
				git_path(whence == FROM_MERGE
					 ? "MERGE_HEAD"
					 : "CHERRY_PICK_HEAD"));
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780 781
		fprintf(s->fp, "\n");
		status_printf(s, GIT_COLOR_NORMAL,
782
			_("Please enter the commit message for your changes."));
783
		if (cleanup_mode == CLEANUP_ALL)
784
			status_printf_more(s, GIT_COLOR_NORMAL,
785
				_(" Lines starting\n"
786
				"with '#' will be ignored, and an empty"
787
				" message aborts the commit.\n"));
788
		else /* CLEANUP_SPACE, that is. */
789
			status_printf_more(s, GIT_COLOR_NORMAL,
790
				_(" Lines starting\n"
791
				"with '#' will be kept; you may remove them"
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				" yourself if you want to.\n"
793
				"An empty message aborts the commit.\n"));
794
		if (only_include_assumed)
795 796
			status_printf_ln(s, GIT_COLOR_NORMAL,
					"%s", only_include_assumed);
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798 799 800
		ai_tmp = cut_ident_timestamp_part(author_ident->buf);
		ci_tmp = cut_ident_timestamp_part(committer_ident.buf);
		if (strcmp(author_ident->buf, committer_ident.buf))
801
			status_printf_ln(s, GIT_COLOR_NORMAL,
802 803
				_("%s"
				"Author:    %s"),
804
				ident_shown++ ? "" : "\n",
805
				author_ident->buf);
806

807
		if (!user_ident_sufficiently_given())
808
			status_printf_ln(s, GIT_COLOR_NORMAL,
809 810
				_("%s"
				"Committer: %s"),
811
				ident_shown++ ? "" : "\n",
812
				committer_ident.buf);
813 814

		if (ident_shown)
815
			status_printf_ln(s, GIT_COLOR_NORMAL, "");
816

817 818
		saved_color_setting = s->use_color;
		s->use_color = 0;
819
		commitable = run_status(s->fp, index_file, prefix, 1, s);
820
		s->use_color = saved_color_setting;
821 822 823

		*ai_tmp = ' ';
		*ci_tmp = ' ';
824
	} else {
825
		unsigned char sha1[20];
826
		const char *parent = "HEAD";
827 828

		if (!active_nr && read_cache() < 0)
829
			die(_("Cannot read index"));
830

831 832 833
		if (amend)
			parent = "HEAD^1";

834
		if (get_sha1(parent, sha1))
835
			commitable = !!active_nr;
836 837
		else
			commitable = index_differs_from(parent, 0);
838
	}
839
	strbuf_release(&committer_ident);
840

841
	fclose(s->fp);
842

843 844 845 846 847 848
	/*
	 * 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 (!commitable && whence != FROM_MERGE && !allow_empty &&
849
	    !(amend && is_a_merge(head_sha1))) {
850
		run_status(stdout, index_file, prefix, 0, s);
851
		if (amend)
852
			fputs(_(empty_amend_advice), stderr);
853
		else if (whence == FROM_CHERRY_PICK)
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854
			fputs(_(empty_cherry_pick_advice), stderr);
855
		return 0;
856 857
	}

858 859 860 861 862 863 864 865 866 867 868
	/*
	 * Re-read the index as pre-commit hook could have updated it,
	 * and write it out as a tree.  We must do this before we invoke
	 * the editor and after we invoke run_status above.
	 */
	discard_cache();
	read_cache_from(index_file);
	if (!active_cache_tree)
		active_cache_tree = cache_tree();
	if (cache_tree_update(active_cache_tree,
			      active_cache, active_nr, 0, 0) < 0) {
869
		error(_("Error building trees"));
870
		return 0;
871
	}
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873 874 875
	if (run_hook(index_file, "prepare-commit-msg",
		     git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
		return 0;
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877 878
	if (use_editor) {
		char index[PATH_MAX];
879 880
		const char *env[2] = { NULL };
		env[0] =  index;
881
		snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
882 883
		if (launch_editor(git_path(commit_editmsg), NULL, env)) {
			fprintf(stderr,
884
			_("Please supply the message using either -m or -F option.\n"));
885 886
			exit(1);
		}
887
	}
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889 890 891 892
	if (!no_verify &&
	    run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
		return 0;
	}
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894
	return 1;
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}

/*
898 899
 * Find out if the message in the strbuf contains only whitespace and
 * Signed-off-by lines.
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 */
901
static int message_is_empty(struct strbuf *sb)
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902
{
903
	struct strbuf tmpl = STRBUF_INIT;
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904
	const char *nl;
905
	int eol, i, start = 0;
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907 908 909
	if (cleanup_mode == CLEANUP_NONE && sb->len)
		return 0;

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	/* See if the template is just a prefix of the message. */
	if (template_file && strbuf_read_file(&tmpl, template_file, 0) > 0) {
912
		stripspace(&tmpl, cleanup_mode == CLEANUP_ALL);
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		if (start + tmpl.len <= sb->len &&
		    memcmp(tmpl.buf, sb->buf + start, tmpl.len) == 0)
			start += tmpl.len;
	}
	strbuf_release(&tmpl);

	/* Check if the rest is just whitespace and Signed-of-by's. */
	for (i = start; i < sb->len; i++) {
		nl = memchr(sb->buf + i, '\n', sb->len - i);
		if (nl)
			eol = nl - sb->buf;
		else
			eol = sb->len;

		if (strlen(sign_off_header) <= eol - i &&
		    !prefixcmp(sb->buf + i, sign_off_header)) {
			i = eol;
			continue;
		}
		while (i < eol)
			if (!isspace(sb->buf[i++]))
				return 0;
	}

	return 1;
}

940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
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;

	init_revisions(&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);
	prepare_revision_walk(&revs);
	commit = get_revision(&revs);
	if (commit) {
958 959
		struct pretty_print_context ctx = {0};
		ctx.date_mode = DATE_NORMAL;
960
		strbuf_release(&buf);
961
		format_commit_message(commit, "%an <%ae>", &buf, &ctx);
962 963
		return strbuf_detach(&buf, NULL);
	}
964
	die(_("No existing author found with '%s'"), name);
965 966
}

967 968 969 970 971 972 973 974 975 976 977 978

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;
	else
979
		die(_("Invalid untracked files mode '%s'"), untracked_files_arg);
980 981
}

982 983 984 985 986 987 988
static const char *read_commit_message(const char *name)
{
	const char *out_enc, *out;
	struct commit *commit;

	commit = lookup_commit_reference_by_name(name);
	if (!commit)
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		die(_("could not lookup commit %s"), name);
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	out_enc = get_commit_output_encoding();
	out = logmsg_reencode(commit, out_enc);

	/*
	 * If we failed to reencode the buffer, just copy it
	 * byte for byte so the user can try to fix it up.
	 * This also handles the case where input and output
	 * encodings are identical.
	 */
	if (out == NULL)
		out = xstrdup(commit->buffer);
	return out;
}

1004
static int parse_and_validate_options(int argc, const char *argv[],
1005
				      const char * const usage[],
1006 1007
				      const char *prefix,
				      struct wt_status *s)
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{
	int f = 0;

1011 1012
	argc = parse_options(argc, argv, prefix, builtin_commit_options, usage,
			     0);
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1014 1015 1016
	if (force_author && !strchr(force_author, '>'))
		force_author = find_author_by_nickname(force_author);

1017
	if (force_author && renew_authorship)
1018
		die(_("Using both --reset-author and --author does not make sense"));
1019

1020
	if (logfile || message.len || use_message || fixup_message)
1021
		use_editor = 0;
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1022
	if (edit_flag)
1023
		use_editor = 1;
1024 1025
	if (!use_editor)
		setenv("GIT_EDITOR", ":", 1);
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	if (get_sha1("HEAD", head_sha1))
		initial_commit = 1;

	/* Sanity check options */
	if (amend && initial_commit)
1032
		die(_("You have nothing to amend."));
1033
	if (amend && whence != FROM_COMMIT)
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		die(_("You are in the middle of a %s -- cannot amend."), whence_s());
1035
	if (fixup_message && squash_message)
1036
		die(_("Options --squash and --fixup cannot be used together"));
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	if (use_message)
		f++;
	if (edit_message)
		f++;