Merge branch 'mh/avoid-rewriting-packed-refs' into maint
[gitweb.git] / builtin / commit.c
index 63a8424c5a5342ae52f1cb9f463e260328b5bec5..be370f64a995804ec6b62e03f7c6940044e08e24 100644 (file)
@@ -6,6 +6,7 @@
  */
 
 #include "cache.h"
+#include "config.h"
 #include "lockfile.h"
 #include "cache-tree.h"
 #include "color.h"
@@ -139,17 +140,26 @@ static enum commit_whence whence;
 static int sequencer_in_use;
 static int use_editor = 1, include_status = 1;
 static int show_ignored_in_status, have_option_m;
-static const char *only_include_assumed;
 static struct strbuf message = STRBUF_INIT;
 
-static enum status_format {
-       STATUS_FORMAT_NONE = 0,
-       STATUS_FORMAT_LONG,
-       STATUS_FORMAT_SHORT,
-       STATUS_FORMAT_PORCELAIN,
+static enum wt_status_format status_format = STATUS_FORMAT_UNSPECIFIED;
 
-       STATUS_FORMAT_UNSPECIFIED
-} status_format = STATUS_FORMAT_UNSPECIFIED;
+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)
 {
@@ -173,7 +183,7 @@ static void determine_whence(struct wt_status *s)
                whence = FROM_MERGE;
        else if (file_exists(git_path_cherry_pick_head())) {
                whence = FROM_CHERRY_PICK;
-               if (file_exists(git_path(SEQ_DIR)))
+               if (file_exists(git_path_seq_dir()))
                        sequencer_in_use = 1;
        }
        else
@@ -185,7 +195,6 @@ static void determine_whence(struct wt_status *s)
 static void status_init_config(struct wt_status *s, config_fn_t fn)
 {
        wt_status_prepare(s);
-       gitmodules_config();
        git_config(fn, s);
        determine_whence(s);
        init_diff_ui_defaults();
@@ -243,7 +252,8 @@ static int list_paths(struct string_list *list, const char *with_tree,
 
        if (with_tree) {
                char *max_prefix = common_prefix(pattern);
-               overlay_tree_on_cache(with_tree, max_prefix ? max_prefix : prefix);
+               overlay_tree_on_index(&the_index, with_tree,
+                                     max_prefix ? max_prefix : prefix);
                free(max_prefix);
        }
 
@@ -303,7 +313,7 @@ static void create_base_index(const struct commit *current_head)
        opts.dst_index = &the_index;
 
        opts.fn = oneway_merge;
-       tree = parse_tree_indirect(current_head->object.oid.hash);
+       tree = parse_tree_indirect(&current_head->object.oid);
        if (!tree)
                die(_("failed to unpack HEAD tree object"));
        parse_tree(tree);
@@ -325,7 +335,7 @@ static void refresh_cache_or_die(int refresh_flags)
 static const char *prepare_index(int argc, const char **argv, const char *prefix,
                                 const struct commit *current_head, int is_status)
 {
-       struct string_list partial;
+       struct string_list partial = STRING_LIST_INIT_DUP;
        struct pathspec pathspec;
        int refresh_flags = REFRESH_QUIET;
        const char *ret;
@@ -341,7 +351,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
 
        if (interactive) {
                char *old_index_env = NULL;
-               hold_locked_index(&index_lock, 1);
+               hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR);
 
                refresh_cache_or_die(refresh_flags);
 
@@ -370,7 +380,8 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
                        warning(_("Failed to update main cache tree"));
 
                commit_style = COMMIT_NORMAL;
-               return get_lock_file_path(&index_lock);
+               ret = get_lock_file_path(&index_lock);
+               goto out;
        }
 
        /*
@@ -386,14 +397,15 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
         * (B) on failure, rollback the real index.
         */
        if (all || (also && pathspec.nr)) {
-               hold_locked_index(&index_lock, 1);
+               hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR);
                add_files_to_cache(also ? prefix : NULL, &pathspec, 0);
                refresh_cache_or_die(refresh_flags);
                update_main_cache_tree(WRITE_TREE_SILENT);
                if (write_locked_index(&the_index, &index_lock, CLOSE_LOCK))
                        die(_("unable to write new_index file"));
                commit_style = COMMIT_NORMAL;
-               return get_lock_file_path(&index_lock);
+               ret = get_lock_file_path(&index_lock);
+               goto out;
        }
 
        /*
@@ -406,7 +418,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
         * We still need to refresh the index here.
         */
        if (!only && !pathspec.nr) {
-               hold_locked_index(&index_lock, 1);
+               hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR);
                refresh_cache_or_die(refresh_flags);
                if (active_cache_changed
                    || !cache_tree_fully_valid(active_cache_tree))
@@ -419,7 +431,8 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
                        rollback_lock_file(&index_lock);
                }
                commit_style = COMMIT_AS_IS;
-               return get_index_file();
+               ret = get_index_file();
+               goto out;
        }
 
        /*
@@ -450,7 +463,6 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
                        die(_("cannot do a partial commit during a cherry-pick."));
        }
 
-       string_list_init(&partial, 1);
        if (list_paths(&partial, !current_head ? NULL : "HEAD", prefix, &pathspec))
                exit(1);
 
@@ -458,7 +470,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
        if (read_cache() < 0)
                die(_("cannot read the index"));
 
-       hold_locked_index(&index_lock, 1);
+       hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR);
        add_remove_files(&partial);
        refresh_cache(REFRESH_QUIET);
        update_main_cache_tree(WRITE_TREE_SILENT);
@@ -480,13 +492,16 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
        discard_cache();
        ret = get_lock_file_path(&false_lock);
        read_cache_from(ret);
+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)
 {
-       unsigned char sha1[20];
+       struct object_id oid;
 
        if (s->relative_paths)
                s->prefix = prefix;
@@ -499,25 +514,14 @@ static int run_status(FILE *fp, const char *index_file, const char *prefix, int
        s->index_file = index_file;
        s->fp = fp;
        s->nowarn = nowarn;
-       s->is_initial = get_sha1(s->reference, sha1) ? 1 : 0;
+       s->is_initial = get_oid(s->reference, &oid) ? 1 : 0;
+       if (!s->is_initial)
+               hashcpy(s->sha1_commit, oid.hash);
+       s->status_format = status_format;
+       s->ignore_submodule_arg = ignore_submodule_arg;
 
        wt_status_collect(s);
-
-       switch (status_format) {
-       case STATUS_FORMAT_SHORT:
-               wt_shortstatus_print(s);
-               break;
-       case STATUS_FORMAT_PORCELAIN:
-               wt_porcelain_print(s);
-               break;
-       case STATUS_FORMAT_UNSPECIFIED:
-               die("BUG: finalize_deferred_config() should have been called");
-               break;
-       case STATUS_FORMAT_NONE:
-       case STATUS_FORMAT_LONG:
-               wt_status_print(s);
-               break;
-       }
+       wt_status_print(s);
 
        return s->commitable;
 }
@@ -791,7 +795,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                strbuf_stripspace(&sb, 0);
 
        if (signoff)
-               append_signoff(&sb, ignore_non_trailer(&sb), 0);
+               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"));
@@ -822,9 +826,9 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                                        "If this is not correct, please remove the file\n"
                                        "       %s\n"
                                        "and try again.\n"),
-                               git_path(whence == FROM_MERGE
-                                        ? "MERGE_HEAD"
-                                        : "CHERRY_PICK_HEAD"));
+                               whence == FROM_MERGE ?
+                                       git_path_merge_head() :
+                                       git_path_cherry_pick_head());
                }
 
                fprintf(s->fp, "\n");
@@ -842,9 +846,6 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                                  "with '%c' will be kept; you may remove them"
                                  " yourself if you want to.\n"
                                  "An empty message aborts the commit.\n"), comment_line_char);
-               if (only_include_assumed)
-                       status_printf_ln(s, GIT_COLOR_NORMAL,
-                                       "%s", only_include_assumed);
 
                /*
                 * These should never fail because they come from our own
@@ -878,15 +879,14 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                                (int)(ci.name_end - ci.name_begin), ci.name_begin,
                                (int)(ci.mail_end - ci.mail_begin), ci.mail_begin);
 
-               if (ident_shown)
-                       status_printf_ln(s, GIT_COLOR_NORMAL, "%s", "");
+               status_printf_ln(s, GIT_COLOR_NORMAL, "%s", ""); /* Add new line for clarity */
 
                saved_color_setting = s->use_color;
                s->use_color = 0;
                commitable = run_status(s->fp, index_file, prefix, 1, s);
                s->use_color = saved_color_setting;
        } else {
-               unsigned char sha1[20];
+               struct object_id oid;
                const char *parent = "HEAD";
 
                if (!active_nr && read_cache() < 0)
@@ -895,9 +895,14 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                if (amend)
                        parent = "HEAD^1";
 
-               if (get_sha1(parent, sha1))
-                       commitable = !!active_nr;
-               else {
+               if (get_oid(parent, &oid)) {
+                       int i, ita_nr = 0;
+
+                       for (i = 0; i < active_nr; i++)
+                               if (ce_intent_to_add(active_cache[i]))
+                                       ita_nr++;
+                       commitable = active_nr - ita_nr > 0;
+               } else {
                        /*
                         * Unless the user did explicitly request a submodule
                         * ignore mode by passing a command line option we do
@@ -911,7 +916,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                        if (ignore_submodule_arg &&
                            !strcmp(ignore_submodule_arg, "all"))
                                diff_flags |= DIFF_OPT_IGNORE_SUBMODULES;
-                       commitable = index_differs_from(parent, diff_flags);
+                       commitable = index_differs_from(parent, diff_flags, 1);
                }
        }
        strbuf_release(&committer_ident);
@@ -939,13 +944,16 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                return 0;
        }
 
-       /*
-        * 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();
+       if (!no_verify && find_hook("pre-commit")) {
+               /*
+                * 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 (update_main_cache_tree(0)) {
                error(_("Error building trees"));
                return 0;
@@ -956,15 +964,15 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                return 0;
 
        if (use_editor) {
-               char index[PATH_MAX];
-               const char *env[2] = { NULL };
-               env[0] =  index;
-               snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
-               if (launch_editor(git_path_commit_editmsg(), NULL, env)) {
+               struct argv_array env = ARGV_ARRAY_INIT;
+
+               argv_array_pushf(&env, "GIT_INDEX_FILE=%s", index_file);
+               if (launch_editor(git_path_commit_editmsg(), NULL, env.argv)) {
                        fprintf(stderr,
                        _("Please supply the message using either -m or -F option.\n"));
                        exit(1);
                }
+               argv_array_clear(&env);
        }
 
        if (!no_verify &&
@@ -980,7 +988,7 @@ static int rest_is_empty(struct strbuf *sb, int start)
        int i, eol;
        const char *nl;
 
-       /* Check if the rest is just whitespace and Signed-of-by's. */
+       /* Check if the rest is just whitespace and Signed-off-by's. */
        for (i = start; i < sb->len; i++) {
                nl = memchr(sb->buf + i, '\n', sb->len - i);
                if (nl)
@@ -1099,7 +1107,7 @@ static const char *read_commit_message(const char *name)
  * is not in effect here.
  */
 static struct status_deferred_config {
-       enum status_format status_format;
+       enum wt_status_format status_format;
        int show_branch;
 } status_deferred_config = {
        STATUS_FORMAT_UNSPECIFIED,
@@ -1109,6 +1117,7 @@ static struct status_deferred_config {
 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) {
@@ -1201,12 +1210,8 @@ static int parse_and_validate_options(int argc, const char *argv[],
 
        if (also + only + all + interactive > 1)
                die(_("Only one of --include/--only/--all/--interactive/--patch can be used."));
-       if (argc == 0 && (also || (only && !amend)))
+       if (argc == 0 && (also || (only && !amend && !allow_empty)))
                die(_("No paths with --include/--only does not make sense."));
-       if (argc == 0 && only && amend)
-               only_include_assumed = _("Clever... amending the last one with dirty index.");
-       if (argc > 0 && !also && !only)
-               only_include_assumed = _("Explicit paths specified without -i or -o; assuming --only paths...");
        if (!cleanup_arg || !strcmp(cleanup_arg, "default"))
                cleanup_mode = use_editor ? CLEANUP_ALL : CLEANUP_SPACE;
        else if (!strcmp(cleanup_arg, "verbatim"))
@@ -1260,6 +1265,10 @@ static int parse_status_slot(const char *slot)
                return WT_STATUS_NOBRANCH;
        if (!strcasecmp(slot, "unmerged"))
                return WT_STATUS_UNMERGED;
+       if (!strcasecmp(slot, "localBranch"))
+               return WT_STATUS_LOCAL_BRANCH;
+       if (!strcasecmp(slot, "remoteBranch"))
+               return WT_STATUS_REMOTE_BRANCH;
        return -1;
 }
 
@@ -1288,6 +1297,10 @@ static int git_status_config(const char *k, const char *v, void *cb)
                status_deferred_config.show_branch = 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;
@@ -1329,16 +1342,18 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 {
        static struct wt_status s;
        int fd;
-       unsigned char sha1[20];
+       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_SET_INT(0, "porcelain", &status_format,
-                           N_("machine-readable output"),
-                           STATUS_FORMAT_PORCELAIN),
+               OPT_BOOL(0, "show-stash", &s.show_stash,
+                        N_("show stash information")),
+               { OPTION_CALLBACK, 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),
@@ -1377,10 +1392,19 @@ int cmd_status(int argc, const char **argv, const char *prefix)
        read_cache_preload(&s.pathspec);
        refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, &s.pathspec, NULL, NULL);
 
-       fd = hold_locked_index(&index_lock, 0);
+       if (use_optional_locks())
+               fd = hold_locked_index(&index_lock, 0);
+       else
+               fd = -1;
+
+       s.is_initial = get_oid(s.reference, &oid) ? 1 : 0;
+       if (!s.is_initial)
+               hashcpy(s.sha1_commit, oid.hash);
 
-       s.is_initial = get_sha1(s.reference, sha1) ? 1 : 0;
        s.ignore_submodule_arg = ignore_submodule_arg;
+       s.status_format = status_format;
+       s.verbose = verbose;
+
        wt_status_collect(&s);
 
        if (0 <= fd)
@@ -1389,29 +1413,13 @@ int cmd_status(int argc, const char **argv, const char *prefix)
        if (s.relative_paths)
                s.prefix = prefix;
 
-       switch (status_format) {
-       case STATUS_FORMAT_SHORT:
-               wt_shortstatus_print(&s);
-               break;
-       case STATUS_FORMAT_PORCELAIN:
-               wt_porcelain_print(&s);
-               break;
-       case STATUS_FORMAT_UNSPECIFIED:
-               die("BUG: finalize_deferred_config() should have been called");
-               break;
-       case STATUS_FORMAT_NONE:
-       case STATUS_FORMAT_LONG:
-               s.verbose = verbose;
-               s.ignore_submodule_arg = ignore_submodule_arg;
-               wt_status_print(&s);
-               break;
-       }
+       wt_status_print(&s);
        return 0;
 }
 
 static const char *implicit_ident_advice(void)
 {
-       char *user_config = expand_user_path("~/.gitconfig");
+       char *user_config = expand_user_path("~/.gitconfig", 0);
        char *xdg_config = xdg_config_home("config");
        int config_exists = file_exists(user_config) || file_exists(xdg_config);
 
@@ -1425,19 +1433,18 @@ static const char *implicit_ident_advice(void)
 
 }
 
-static void print_summary(const char *prefix, const unsigned char *sha1,
+static void print_summary(const char *prefix, const struct object_id *oid,
                          int initial_commit)
 {
        struct rev_info rev;
        struct commit *commit;
        struct strbuf format = STRBUF_INIT;
-       unsigned char junk_sha1[20];
        const char *head;
        struct pretty_print_context pctx = {0};
        struct strbuf author_ident = STRBUF_INIT;
        struct strbuf committer_ident = STRBUF_INIT;
 
-       commit = lookup_commit(sha1);
+       commit = lookup_commit(oid);
        if (!commit)
                die(_("couldn't look up newly created commit"));
        if (parse_commit(commit))
@@ -1484,7 +1491,9 @@ static void print_summary(const char *prefix, const unsigned char *sha1,
        rev.diffopt.break_opt = 0;
        diff_setup_done(&rev.diffopt);
 
-       head = resolve_ref_unsafe("HEAD", 0, junk_sha1, NULL);
+       head = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
+       if (!head)
+               die_errno(_("unable to resolve HEAD after creating commit"));
        if (!strcmp(head, "HEAD"))
                head = _("detached HEAD");
        else
@@ -1529,15 +1538,13 @@ static int git_commit_config(const char *k, const char *v, void *cb)
        return git_status_config(k, v, s);
 }
 
-static int run_rewrite_hook(const unsigned char *oldsha1,
-                           const unsigned char *newsha1)
+static int run_rewrite_hook(const struct object_id *oldoid,
+                           const struct object_id *newoid)
 {
-       /* oldsha1 SP newsha1 LF NUL */
-       static char buf[2*40 + 3];
        struct child_process proc = CHILD_PROCESS_INIT;
        const char *argv[3];
        int code;
-       size_t n;
+       struct strbuf sb = STRBUF_INIT;
 
        argv[0] = find_hook("post-rewrite");
        if (!argv[0])
@@ -1553,34 +1560,33 @@ static int run_rewrite_hook(const unsigned char *oldsha1,
        code = start_command(&proc);
        if (code)
                return code;
-       n = snprintf(buf, sizeof(buf), "%s %s\n",
-                    sha1_to_hex(oldsha1), sha1_to_hex(newsha1));
+       strbuf_addf(&sb, "%s %s\n", oid_to_hex(oldoid), oid_to_hex(newoid));
        sigchain_push(SIGPIPE, SIG_IGN);
-       write_in_full(proc.in, buf, n);
+       write_in_full(proc.in, sb.buf, sb.len);
        close(proc.in);
+       strbuf_release(&sb);
        sigchain_pop(SIGPIPE);
        return finish_command(&proc);
 }
 
 int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...)
 {
-       const char *hook_env[3] =  { NULL };
-       char index[PATH_MAX];
+       struct argv_array hook_env = ARGV_ARRAY_INIT;
        va_list args;
        int ret;
 
-       snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
-       hook_env[0] = index;
+       argv_array_pushf(&hook_env, "GIT_INDEX_FILE=%s", index_file);
 
        /*
         * Let the hook know that no editor will be launched.
         */
        if (!editor_is_used)
-               hook_env[1] = "GIT_EDITOR=:";
+               argv_array_push(&hook_env, "GIT_EDITOR=:");
 
        va_start(args, name);
-       ret = run_hook_ve(hook_envname, args);
+       ret = run_hook_ve(hook_env.argv,name, args);
        va_end(args);
+       argv_array_clear(&hook_env);
 
        return ret;
 }
@@ -1646,7 +1652,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
        struct strbuf author_ident = STRBUF_INIT;
        const char *index_file, *reflog_msg;
        char *nl;
-       unsigned char sha1[20];
+       struct object_id oid;
        struct commit_list *parents = NULL;
        struct stat statbuf;
        struct commit *current_head = NULL;
@@ -1658,13 +1664,14 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
                usage_with_options(builtin_commit_usage, builtin_commit_options);
 
        status_init_config(&s, git_commit_config);
+       s.commit_template = 1;
        status_format = STATUS_FORMAT_NONE; /* Ignore status.short */
        s.colopts = 0;
 
-       if (get_sha1("HEAD", sha1))
+       if (get_oid("HEAD", &oid))
                current_head = NULL;
        else {
-               current_head = lookup_commit_or_die(sha1, "HEAD");
+               current_head = lookup_commit_or_die(&oid, "HEAD");
                if (parse_commit(current_head))
                        die(_("could not parse HEAD commit"));
        }
@@ -1705,10 +1712,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
                if (!reflog_msg)
                        reflog_msg = "commit (merge)";
                pptr = commit_list_append(current_head, pptr);
-               fp = fopen(git_path_merge_head(), "r");
-               if (fp == NULL)
-                       die_errno(_("could not open '%s' for reading"),
-                                 git_path_merge_head());
+               fp = xfopen(git_path_merge_head(), "r");
                while (strbuf_getline_lf(&m, fp) != EOF) {
                        struct commit *parent;
 
@@ -1726,7 +1730,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
                                allow_fast_forward = 0;
                }
                if (allow_fast_forward)
-                       parents = reduce_heads(parents);
+                       reduce_heads_replace(&parents);
        } else {
                if (!reflog_msg)
                        reflog_msg = (whence == FROM_CHERRY_PICK)
@@ -1745,18 +1749,18 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 
        if (verbose || /* Truncate the message just before the diff, if any. */
            cleanup_mode == CLEANUP_SCISSORS)
-               wt_status_truncate_message_at_cut_line(&sb);
-
+               strbuf_setlen(&sb, wt_status_locate_end(sb.buf, sb.len));
        if (cleanup_mode != CLEANUP_NONE)
                strbuf_stripspace(&sb, cleanup_mode == CLEANUP_ALL);
-       if (template_untouched(&sb) && !allow_empty_message) {
+
+       if (message_is_empty(&sb) && !allow_empty_message) {
                rollback_index_files();
-               fprintf(stderr, _("Aborting commit; you did not edit the message.\n"));
+               fprintf(stderr, _("Aborting commit due to empty commit message.\n"));
                exit(1);
        }
-       if (message_is_empty(&sb) && !allow_empty_message) {
+       if (template_untouched(&sb) && !allow_empty_message) {
                rollback_index_files();
-               fprintf(stderr, _("Aborting commit due to empty commit message.\n"));
+               fprintf(stderr, _("Aborting commit; you did not edit the message.\n"));
                exit(1);
        }
 
@@ -1768,8 +1772,8 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
                append_merge_tag_headers(parents, &tail);
        }
 
-       if (commit_tree_extended(sb.buf, sb.len, active_cache_tree->sha1,
-                        parents, sha1, author_ident.buf, sign_commit, extra)) {
+       if (commit_tree_extended(sb.buf, sb.len, active_cache_tree->oid.hash,
+                        parents, oid.hash, author_ident.buf, sign_commit, extra)) {
                rollback_index_files();
                die(_("failed to write commit object"));
        }
@@ -1786,7 +1790,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 
        transaction = ref_transaction_begin(&err);
        if (!transaction ||
-           ref_transaction_update(transaction, "HEAD", sha1,
+           ref_transaction_update(transaction, "HEAD", oid.hash,
                                   current_head
                                   ? current_head->object.oid.hash : null_sha1,
                                   0, sb.buf, &err) ||
@@ -1815,14 +1819,15 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
                cfg = init_copy_notes_for_rewrite("amend");
                if (cfg) {
                        /* we are amending, so current_head is not NULL */
-                       copy_note_for_rewrite(cfg, current_head->object.oid.hash, sha1);
+                       copy_note_for_rewrite(cfg, &current_head->object.oid, &oid);
                        finish_copy_notes_for_rewrite(cfg, "Notes added by 'git commit --amend'");
                }
-               run_rewrite_hook(current_head->object.oid.hash, sha1);
+               run_rewrite_hook(&current_head->object.oid, &oid);
        }
        if (!quiet)
-               print_summary(prefix, sha1, !current_head);
+               print_summary(prefix, &oid, !current_head);
 
-       strbuf_release(&err);
+       UNLEAK(err);
+       UNLEAK(sb);
        return 0;
 }