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![Junio C Hamano](/assets/img/avatar_default.png)
A helper function that takes the contents of a commit object and finds its subject line did not ignore leading blank lines, as is commonly done by other codepaths. Make it ignore leading blank lines to match. * js/find-commit-subject-ignore-leading-blanks: reset --hard: skip blank lines when reporting the commit subject sequencer: use skip_blank_lines() to find the commit subject commit -C: skip blank lines at the beginning of the message commit.c: make find_commit_subject() more robust pretty: make the skip_blank_lines() function public
390 lines
11 KiB
C
390 lines
11 KiB
C
/*
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* "git reset" builtin command
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*
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* Copyright (c) 2007 Carlos Rica
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*
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* Based on git-reset.sh, which is
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*
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* Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
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*/
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#include "builtin.h"
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#include "lockfile.h"
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#include "tag.h"
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#include "object.h"
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#include "commit.h"
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#include "run-command.h"
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#include "refs.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "tree.h"
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#include "branch.h"
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#include "parse-options.h"
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#include "unpack-trees.h"
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#include "cache-tree.h"
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static const char * const git_reset_usage[] = {
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N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
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N_("git reset [-q] <tree-ish> [--] <paths>..."),
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N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
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NULL
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};
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enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
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static const char *reset_type_names[] = {
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N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
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};
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static inline int is_merge(void)
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{
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return !access(git_path_merge_head(), F_OK);
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}
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static int reset_index(const unsigned char *sha1, int reset_type, int quiet)
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{
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int nr = 1;
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struct tree_desc desc[2];
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struct tree *tree;
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struct unpack_trees_options opts;
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memset(&opts, 0, sizeof(opts));
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opts.head_idx = 1;
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opts.src_index = &the_index;
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opts.dst_index = &the_index;
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opts.fn = oneway_merge;
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opts.merge = 1;
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if (!quiet)
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opts.verbose_update = 1;
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switch (reset_type) {
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case KEEP:
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case MERGE:
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opts.update = 1;
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break;
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case HARD:
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opts.update = 1;
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/* fallthrough */
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default:
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opts.reset = 1;
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}
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read_cache_unmerged();
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if (reset_type == KEEP) {
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unsigned char head_sha1[20];
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if (get_sha1("HEAD", head_sha1))
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return error(_("You do not have a valid HEAD."));
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if (!fill_tree_descriptor(desc, head_sha1))
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return error(_("Failed to find tree of HEAD."));
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nr++;
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opts.fn = twoway_merge;
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}
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if (!fill_tree_descriptor(desc + nr - 1, sha1))
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return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
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if (unpack_trees(nr, desc, &opts))
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return -1;
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if (reset_type == MIXED || reset_type == HARD) {
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tree = parse_tree_indirect(sha1);
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prime_cache_tree(&the_index, tree);
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}
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return 0;
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}
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static void print_new_head_line(struct commit *commit)
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{
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const char *hex, *body;
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const char *msg;
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hex = find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);
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printf(_("HEAD is now at %s"), hex);
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msg = logmsg_reencode(commit, NULL, get_log_output_encoding());
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body = strstr(msg, "\n\n");
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if (body) {
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const char *eol;
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size_t len;
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body = skip_blank_lines(body + 2);
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eol = strchr(body, '\n');
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len = eol ? eol - body : strlen(body);
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printf(" %.*s\n", (int) len, body);
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}
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else
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printf("\n");
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unuse_commit_buffer(commit, msg);
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}
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static void update_index_from_diff(struct diff_queue_struct *q,
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struct diff_options *opt, void *data)
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{
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int i;
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int intent_to_add = *(int *)data;
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for (i = 0; i < q->nr; i++) {
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struct diff_filespec *one = q->queue[i]->one;
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int is_missing = !(one->mode && !is_null_sha1(one->sha1));
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struct cache_entry *ce;
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if (is_missing && !intent_to_add) {
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remove_file_from_cache(one->path);
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continue;
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}
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ce = make_cache_entry(one->mode, one->sha1, one->path,
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0, 0);
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if (!ce)
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die(_("make_cache_entry failed for path '%s'"),
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one->path);
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if (is_missing) {
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ce->ce_flags |= CE_INTENT_TO_ADD;
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set_object_name_for_intent_to_add_entry(ce);
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}
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add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
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}
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}
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static int read_from_tree(const struct pathspec *pathspec,
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unsigned char *tree_sha1,
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int intent_to_add)
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{
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struct diff_options opt;
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memset(&opt, 0, sizeof(opt));
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copy_pathspec(&opt.pathspec, pathspec);
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opt.output_format = DIFF_FORMAT_CALLBACK;
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opt.format_callback = update_index_from_diff;
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opt.format_callback_data = &intent_to_add;
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if (do_diff_cache(tree_sha1, &opt))
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return 1;
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diffcore_std(&opt);
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diff_flush(&opt);
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clear_pathspec(&opt.pathspec);
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return 0;
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}
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static void set_reflog_message(struct strbuf *sb, const char *action,
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const char *rev)
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{
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const char *rla = getenv("GIT_REFLOG_ACTION");
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strbuf_reset(sb);
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if (rla)
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strbuf_addf(sb, "%s: %s", rla, action);
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else if (rev)
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strbuf_addf(sb, "reset: moving to %s", rev);
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else
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strbuf_addf(sb, "reset: %s", action);
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}
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static void die_if_unmerged_cache(int reset_type)
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{
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if (is_merge() || unmerged_cache())
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die(_("Cannot do a %s reset in the middle of a merge."),
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_(reset_type_names[reset_type]));
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}
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static void parse_args(struct pathspec *pathspec,
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const char **argv, const char *prefix,
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int patch_mode,
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const char **rev_ret)
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{
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const char *rev = "HEAD";
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unsigned char unused[20];
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/*
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* Possible arguments are:
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*
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* git reset [-opts] [<rev>]
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* git reset [-opts] <tree> [<paths>...]
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* git reset [-opts] <tree> -- [<paths>...]
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* git reset [-opts] -- [<paths>...]
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* git reset [-opts] <paths>...
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*
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* At this point, argv points immediately after [-opts].
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*/
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if (argv[0]) {
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if (!strcmp(argv[0], "--")) {
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argv++; /* reset to HEAD, possibly with paths */
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} else if (argv[1] && !strcmp(argv[1], "--")) {
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rev = argv[0];
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argv += 2;
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}
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/*
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* Otherwise, argv[0] could be either <rev> or <paths> and
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* has to be unambiguous. If there is a single argument, it
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* can not be a tree
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*/
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else if ((!argv[1] && !get_sha1_committish(argv[0], unused)) ||
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(argv[1] && !get_sha1_treeish(argv[0], unused))) {
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/*
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* Ok, argv[0] looks like a commit/tree; it should not
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* be a filename.
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*/
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verify_non_filename(prefix, argv[0]);
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rev = *argv++;
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} else {
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/* Otherwise we treat this as a filename */
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verify_filename(prefix, argv[0], 1);
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}
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}
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*rev_ret = rev;
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if (read_cache() < 0)
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die(_("index file corrupt"));
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parse_pathspec(pathspec, 0,
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PATHSPEC_PREFER_FULL |
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PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP |
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(patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0),
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prefix, argv);
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}
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static int reset_refs(const char *rev, const unsigned char *sha1)
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{
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int update_ref_status;
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struct strbuf msg = STRBUF_INIT;
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unsigned char *orig = NULL, sha1_orig[20],
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*old_orig = NULL, sha1_old_orig[20];
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if (!get_sha1("ORIG_HEAD", sha1_old_orig))
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old_orig = sha1_old_orig;
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if (!get_sha1("HEAD", sha1_orig)) {
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orig = sha1_orig;
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set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
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update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
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UPDATE_REFS_MSG_ON_ERR);
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} else if (old_orig)
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delete_ref("ORIG_HEAD", old_orig, 0);
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set_reflog_message(&msg, "updating HEAD", rev);
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update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0,
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UPDATE_REFS_MSG_ON_ERR);
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strbuf_release(&msg);
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return update_ref_status;
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}
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int cmd_reset(int argc, const char **argv, const char *prefix)
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{
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int reset_type = NONE, update_ref_status = 0, quiet = 0;
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int patch_mode = 0, unborn;
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const char *rev;
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struct object_id oid;
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struct pathspec pathspec;
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int intent_to_add = 0;
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const struct option options[] = {
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OPT__QUIET(&quiet, N_("be quiet, only report errors")),
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OPT_SET_INT(0, "mixed", &reset_type,
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N_("reset HEAD and index"), MIXED),
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OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
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OPT_SET_INT(0, "hard", &reset_type,
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N_("reset HEAD, index and working tree"), HARD),
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OPT_SET_INT(0, "merge", &reset_type,
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N_("reset HEAD, index and working tree"), MERGE),
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OPT_SET_INT(0, "keep", &reset_type,
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N_("reset HEAD but keep local changes"), KEEP),
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OPT_BOOL('p', "patch", &patch_mode, N_("select hunks interactively")),
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OPT_BOOL('N', "intent-to-add", &intent_to_add,
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N_("record only the fact that removed paths will be added later")),
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OPT_END()
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options, git_reset_usage,
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PARSE_OPT_KEEP_DASHDASH);
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parse_args(&pathspec, argv, prefix, patch_mode, &rev);
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unborn = !strcmp(rev, "HEAD") && get_sha1("HEAD", oid.hash);
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if (unborn) {
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/* reset on unborn branch: treat as reset to empty tree */
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hashcpy(oid.hash, EMPTY_TREE_SHA1_BIN);
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} else if (!pathspec.nr) {
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struct commit *commit;
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if (get_sha1_committish(rev, oid.hash))
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die(_("Failed to resolve '%s' as a valid revision."), rev);
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commit = lookup_commit_reference(oid.hash);
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if (!commit)
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die(_("Could not parse object '%s'."), rev);
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oidcpy(&oid, &commit->object.oid);
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} else {
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struct tree *tree;
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if (get_sha1_treeish(rev, oid.hash))
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die(_("Failed to resolve '%s' as a valid tree."), rev);
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tree = parse_tree_indirect(oid.hash);
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if (!tree)
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die(_("Could not parse object '%s'."), rev);
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oidcpy(&oid, &tree->object.oid);
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}
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if (patch_mode) {
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if (reset_type != NONE)
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die(_("--patch is incompatible with --{hard,mixed,soft}"));
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return run_add_interactive(rev, "--patch=reset", &pathspec);
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}
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/* git reset tree [--] paths... can be used to
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* load chosen paths from the tree into the index without
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* affecting the working tree nor HEAD. */
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if (pathspec.nr) {
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if (reset_type == MIXED)
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warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
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else if (reset_type != NONE)
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die(_("Cannot do %s reset with paths."),
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_(reset_type_names[reset_type]));
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}
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if (reset_type == NONE)
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reset_type = MIXED; /* by default */
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if (reset_type != SOFT && (reset_type != MIXED || get_git_work_tree()))
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setup_work_tree();
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if (reset_type == MIXED && is_bare_repository())
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die(_("%s reset is not allowed in a bare repository"),
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_(reset_type_names[reset_type]));
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if (intent_to_add && reset_type != MIXED)
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die(_("-N can only be used with --mixed"));
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/* Soft reset does not touch the index file nor the working tree
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* at all, but requires them in a good order. Other resets reset
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* the index file to the tree object we are switching to. */
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if (reset_type == SOFT || reset_type == KEEP)
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die_if_unmerged_cache(reset_type);
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if (reset_type != SOFT) {
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struct lock_file *lock = xcalloc(1, sizeof(*lock));
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hold_locked_index(lock, 1);
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if (reset_type == MIXED) {
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int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
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if (read_from_tree(&pathspec, oid.hash, intent_to_add))
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return 1;
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if (get_git_work_tree())
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refresh_index(&the_index, flags, NULL, NULL,
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_("Unstaged changes after reset:"));
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} else {
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int err = reset_index(oid.hash, reset_type, quiet);
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if (reset_type == KEEP && !err)
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err = reset_index(oid.hash, MIXED, quiet);
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if (err)
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die(_("Could not reset index file to revision '%s'."), rev);
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}
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if (write_locked_index(&the_index, lock, COMMIT_LOCK))
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die(_("Could not write new index file."));
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}
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if (!pathspec.nr && !unborn) {
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/* Any resets without paths update HEAD to the head being
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* switched to, saving the previous head in ORIG_HEAD before. */
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update_ref_status = reset_refs(rev, oid.hash);
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if (reset_type == HARD && !update_ref_status && !quiet)
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print_new_head_line(lookup_commit_reference(oid.hash));
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}
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if (!pathspec.nr)
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remove_branch_state();
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return update_ref_status;
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}
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