Makefile: stop pretending to support rpmbuild
[gitweb.git] / builtin / log.c
index 0f318107e5732a08bc6f979633829ea958d8f9b0..0d738d6ddc0d6335e15392dd90e4118e2cb58b88 100644 (file)
@@ -5,6 +5,7 @@
  *              2006 Junio Hamano
  */
 #include "cache.h"
+#include "refs.h"
 #include "color.h"
 #include "commit.h"
 #include "diff.h"
@@ -19,6 +20,7 @@
 #include "remote.h"
 #include "string-list.h"
 #include "parse-options.h"
+#include "line-log.h"
 #include "branch.h"
 #include "streaming.h"
 #include "version.h"
@@ -30,6 +32,7 @@ static const char *default_date_mode = NULL;
 
 static int default_abbrev_commit;
 static int default_show_root = 1;
+static int default_follow;
 static int decoration_style;
 static int decoration_given;
 static int use_mailmap_config;
@@ -37,11 +40,17 @@ static const char *fmt_patch_subject_prefix = "PATCH";
 static const char *fmt_pretty;
 
 static const char * const builtin_log_usage[] = {
-       N_("git log [<options>] [<since>..<until>] [[--] <path>...]\n")
-       N_("   or: git show [options] <object>..."),
+       N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
+       N_("git show [<options>] <object>..."),
        NULL
 };
 
+struct line_opt_callback_data {
+       struct rev_info *rev;
+       const char *prefix;
+       struct string_list args;
+};
+
 static int parse_decoration_style(const char *var, const char *value)
 {
        switch (git_config_maybe_bool(var, value)) {
@@ -56,6 +65,8 @@ static int parse_decoration_style(const char *var, const char *value)
                return DECORATE_FULL_REFS;
        else if (!strcmp(value, "short"))
                return DECORATE_SHORT_REFS;
+       else if (!strcmp(value, "auto"))
+               return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
        return -1;
 }
 
@@ -69,17 +80,32 @@ static int decorate_callback(const struct option *opt, const char *arg, int unse
                decoration_style = DECORATE_SHORT_REFS;
 
        if (decoration_style < 0)
-               die("invalid --decorate option: %s", arg);
+               die(_("invalid --decorate option: %s"), arg);
 
        decoration_given = 1;
 
        return 0;
 }
 
+static int log_line_range_callback(const struct option *option, const char *arg, int unset)
+{
+       struct line_opt_callback_data *data = option->value;
+
+       if (!arg)
+               return -1;
+
+       data->rev->line_level_traverse = 1;
+       string_list_append(&data->args, arg);
+
+       return 0;
+}
+
 static void cmd_log_init_defaults(struct rev_info *rev)
 {
        if (fmt_pretty)
                get_commit_format(fmt_pretty, rev);
+       if (default_follow)
+               DIFF_OPT_SET(&rev->diffopt, DEFAULT_FOLLOW_RENAMES);
        rev->verbose_header = 1;
        DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
        rev->diffopt.stat_width = -1; /* use full terminal width */
@@ -90,7 +116,8 @@ static void cmd_log_init_defaults(struct rev_info *rev)
        DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
 
        if (default_date_mode)
-               rev->date_mode = parse_date_format(default_date_mode);
+               parse_date_format(default_date_mode, &rev->date_mode);
+       rev->diffopt.touched_flags = 0;
 }
 
 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
@@ -98,16 +125,23 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 {
        struct userformat_want w;
        int quiet = 0, source = 0, mailmap = 0;
+       static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
 
        const struct option builtin_log_options[] = {
-               OPT_BOOLEAN(0, "quiet", &quiet, N_("suppress diff output")),
-               OPT_BOOLEAN(0, "source", &source, N_("show source")),
-               OPT_BOOLEAN(0, "use-mailmap", &mailmap, N_("Use mail map file")),
+               OPT__QUIET(&quiet, N_("suppress diff output")),
+               OPT_BOOL(0, "source", &source, N_("show source")),
+               OPT_BOOL(0, "use-mailmap", &mailmap, N_("Use mail map file")),
                { OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
                  PARSE_OPT_OPTARG, decorate_callback},
+               OPT_CALLBACK('L', NULL, &line_cb, "n,m:file",
+                            N_("Process line range n,m in file, counting from 1"),
+                            log_line_range_callback),
                OPT_END()
        };
 
+       line_cb.rev = rev;
+       line_cb.prefix = prefix;
+
        mailmap = use_mailmap_config;
        argc = parse_options(argc, argv, prefix,
                             builtin_log_options, builtin_log_usage,
@@ -120,7 +154,7 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 
        /* Any arguments at this point are not recognized */
        if (argc > 1)
-               die("unrecognized argument: %s", argv[1]);
+               die(_("unrecognized argument: %s"), argv[1]);
 
        memset(&w, 0, sizeof(w));
        userformat_find_requirements(NULL, &w);
@@ -130,13 +164,9 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
        if (rev->show_notes)
                init_display_notes(&rev->notes_opt);
 
-       if (rev->diffopt.pickaxe || rev->diffopt.filter)
-               rev->always_show_header = 0;
-       if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
+       if (rev->diffopt.pickaxe || rev->diffopt.filter ||
+           DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES))
                rev->always_show_header = 0;
-               if (rev->diffopt.pathspec.nr != 1)
-                       usage("git logs can only follow renames on one pathname at a time");
-       }
 
        if (source)
                rev->show_source = 1;
@@ -161,6 +191,10 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
                rev->show_decorations = 1;
                load_ref_decorations(decoration_style);
        }
+
+       if (rev->line_level_traverse)
+               line_log_init(rev, line_cb.prefix, &line_cb.args);
+
        setup_pager();
 }
 
@@ -206,7 +240,7 @@ static void log_show_early(struct rev_info *revs, struct commit_list *list)
        int i = revs->early_output;
        int show_header = 1;
 
-       sort_in_topological_order(&list, revs->lifo);
+       sort_in_topological_order(&list, revs->sort_order);
        while (list && i) {
                struct commit *commit = list->item;
                switch (simplify_commit(revs, commit)) {
@@ -308,8 +342,7 @@ static int cmd_log_walk(struct rev_info *rev)
         * retain that state information if replacing rev->diffopt in this loop
         */
        while ((commit = get_revision(rev)) != NULL) {
-               if (!log_tree_commit(rev, commit) &&
-                   rev->max_count >= 0)
+               if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
                        /*
                         * We decremented max_count in get_revision,
                         * but we didn't actually show the commit.
@@ -317,8 +350,7 @@ static int cmd_log_walk(struct rev_info *rev)
                        rev->max_count++;
                if (!rev->reflog_info) {
                        /* we allow cycles in reflog ancestry */
-                       free(commit->buffer);
-                       commit->buffer = NULL;
+                       free_commit_buffer(commit);
                }
                free_commit_list(commit->parents);
                commit->parents = NULL;
@@ -339,6 +371,8 @@ static int cmd_log_walk(struct rev_info *rev)
 
 static int git_log_config(const char *var, const char *value, void *cb)
 {
+       const char *slot_name;
+
        if (!strcmp(var, "format.pretty"))
                return git_config_string(&fmt_pretty, var, value);
        if (!strcmp(var, "format.subjectprefix"))
@@ -359,8 +393,12 @@ static int git_log_config(const char *var, const char *value, void *cb)
                default_show_root = git_config_bool(var, value);
                return 0;
        }
-       if (!prefixcmp(var, "color.decorate."))
-               return parse_decorate_color_config(var, 15, value);
+       if (!strcmp(var, "log.follow")) {
+               default_follow = git_config_bool(var, value);
+               return 0;
+       }
+       if (skip_prefix(var, "color.decorate.", &slot_name))
+               return parse_decorate_color_config(var, slot_name, value);
        if (!strcmp(var, "log.mailmap")) {
                use_mailmap_config = git_config_bool(var, value);
                return 0;
@@ -405,10 +443,29 @@ static void show_tagger(char *buf, int len, struct rev_info *rev)
        strbuf_release(&out);
 }
 
-static int show_blob_object(const unsigned char *sha1, struct rev_info *rev)
+static int show_blob_object(const unsigned char *sha1, struct rev_info *rev, const char *obj_name)
 {
+       unsigned char sha1c[20];
+       struct object_context obj_context;
+       char *buf;
+       unsigned long size;
+
        fflush(stdout);
-       return stream_blob_to_fd(1, sha1, NULL, 0);
+       if (!DIFF_OPT_TOUCHED(&rev->diffopt, ALLOW_TEXTCONV) ||
+           !DIFF_OPT_TST(&rev->diffopt, ALLOW_TEXTCONV))
+               return stream_blob_to_fd(1, sha1, NULL, 0);
+
+       if (get_sha1_with_context(obj_name, 0, sha1c, &obj_context))
+               die(_("Not a valid object name %s"), obj_name);
+       if (!obj_context.path[0] ||
+           !textconv_object(obj_context.path, obj_context.mode, sha1c, 1, &buf, &size))
+               return stream_blob_to_fd(1, sha1, NULL, 0);
+
+       if (!buf)
+               die(_("git show %s: bad file"), obj_name);
+
+       write_or_die(1, buf, size);
+       return 0;
 }
 
 static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
@@ -426,7 +483,7 @@ static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
                int new_offset = offset + 1;
                while (new_offset < size && buf[new_offset++] != '\n')
                        ; /* do nothing */
-               if (!prefixcmp(buf + offset, "tagger "))
+               if (starts_with(buf + offset, "tagger "))
                        show_tagger(buf + offset + 7,
                                    new_offset - offset - 7, rev);
                offset = new_offset;
@@ -439,20 +496,21 @@ static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
 }
 
 static int show_tree_object(const unsigned char *sha1,
-               const char *base, int baselen,
+               struct strbuf *base,
                const char *pathname, unsigned mode, int stage, void *context)
 {
        printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
        return 0;
 }
 
-static void show_rev_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
+static void show_setup_revisions_tweak(struct rev_info *rev,
+                                      struct setup_revision_opt *opt)
 {
        if (rev->ignore_merges) {
                /* There was no "-m" on the command line */
                rev->ignore_merges = 0;
                if (!rev->first_parent_only && !rev->combine_merges) {
-                       /* No "--first-parent", "-c", nor "--cc" */
+                       /* No "--first-parent", "-c", or "--cc" */
                        rev->combine_merges = 1;
                        rev->dense_combined_merges = 1;
                }
@@ -472,7 +530,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
        init_grep_defaults();
        git_config(git_log_config, NULL);
 
-       init_pathspec(&match_all, NULL);
+       memset(&match_all, 0, sizeof(match_all));
        init_revisions(&rev, prefix);
        rev.diff = 1;
        rev.always_show_header = 1;
@@ -481,7 +539,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 
        memset(&opt, 0, sizeof(opt));
        opt.def = "HEAD";
-       opt.tweak = show_rev_tweak_rev;
+       opt.tweak = show_setup_revisions_tweak;
        cmd_log_init(argc, argv, prefix, &rev, &opt);
 
        if (!rev.no_walk)
@@ -494,7 +552,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
                const char *name = objects[i].name;
                switch (o->type) {
                case OBJ_BLOB:
-                       ret = show_blob_object(o->sha1, NULL);
+                       ret = show_blob_object(o->oid.hash, &rev, name);
                        break;
                case OBJ_TAG: {
                        struct tag *t = (struct tag *)o;
@@ -505,14 +563,14 @@ int cmd_show(int argc, const char **argv, const char *prefix)
                                        diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
                                        t->tag,
                                        diff_get_color_opt(&rev.diffopt, DIFF_RESET));
-                       ret = show_tag_object(o->sha1, &rev);
+                       ret = show_tag_object(o->oid.hash, &rev);
                        rev.shown_one = 1;
                        if (ret)
                                break;
-                       o = parse_object(t->tagged->sha1);
+                       o = parse_object(t->tagged->oid.hash);
                        if (!o)
                                ret = error(_("Could not read object %s"),
-                                           sha1_to_hex(t->tagged->sha1));
+                                           oid_to_hex(&t->tagged->oid));
                        objects[i].item = o;
                        i--;
                        break;
@@ -568,6 +626,22 @@ int cmd_log_reflog(int argc, const char **argv, const char *prefix)
        return cmd_log_walk(&rev);
 }
 
+static void log_setup_revisions_tweak(struct rev_info *rev,
+                                     struct setup_revision_opt *opt)
+{
+       if (DIFF_OPT_TST(&rev->diffopt, DEFAULT_FOLLOW_RENAMES) &&
+           rev->prune_data.nr == 1)
+               DIFF_OPT_SET(&rev->diffopt, FOLLOW_RENAMES);
+
+       /* Turn --cc/-c into -p --cc/-c when -p was not given */
+       if (!rev->diffopt.output_format && rev->combine_merges)
+               rev->diffopt.output_format = DIFF_FORMAT_PATCH;
+
+       /* Turn -m on when --cc/-c was given */
+       if (rev->combine_merges)
+               rev->ignore_merges = 0;
+}
+
 int cmd_log(int argc, const char **argv, const char *prefix)
 {
        struct rev_info rev;
@@ -581,6 +655,7 @@ int cmd_log(int argc, const char **argv, const char *prefix)
        memset(&opt, 0, sizeof(opt));
        opt.def = "HEAD";
        opt.revarg_opt = REVARG_COMMITTISH;
+       opt.tweak = log_setup_revisions_tweak;
        cmd_log_init(argc, argv, prefix, &rev, &opt);
        return cmd_log_walk(&rev);
 }
@@ -622,6 +697,16 @@ static void add_header(const char *value)
 static int thread;
 static int do_signoff;
 static const char *signature = git_version_string;
+static const char *signature_file;
+static int config_cover_letter;
+static const char *config_output_directory;
+
+enum {
+       COVER_UNSET,
+       COVER_OFF,
+       COVER_ON,
+       COVER_AUTO
+};
 
 static int git_format_config(const char *var, const char *value, void *cb)
 {
@@ -646,7 +731,7 @@ static int git_format_config(const char *var, const char *value, void *cb)
                return 0;
        }
        if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
-           !strcmp(var, "color.ui")) {
+           !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
                return 0;
        }
        if (!strcmp(var, "format.numbered")) {
@@ -683,6 +768,18 @@ static int git_format_config(const char *var, const char *value, void *cb)
        }
        if (!strcmp(var, "format.signature"))
                return git_config_string(&signature, var, value);
+       if (!strcmp(var, "format.signaturefile"))
+               return git_config_pathname(&signature_file, var, value);
+       if (!strcmp(var, "format.coverletter")) {
+               if (value && !strcasecmp(value, "auto")) {
+                       config_cover_letter = COVER_AUTO;
+                       return 0;
+               }
+               config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
+               return 0;
+       }
+       if (!strcmp(var, "format.outputdirectory"))
+               return git_config_string(&config_output_directory, var, value);
 
        return git_log_config(var, value, cb);
 }
@@ -702,8 +799,7 @@ static int reopen_stdout(struct commit *commit, const char *subject,
                if (filename.len >=
                    PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
                        return error(_("name of output directory is too long"));
-               if (filename.buf[filename.len - 1] != '/')
-                       strbuf_addch(&filename, '/');
+               strbuf_complete(&filename, '/');
        }
 
        if (rev->numbered_files)
@@ -726,7 +822,7 @@ static int reopen_stdout(struct commit *commit, const char *subject,
 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 {
        struct rev_info check_rev;
-       struct commit *commit;
+       struct commit *commit, *c1, *c2;
        struct object *o1, *o2;
        unsigned flags1, flags2;
 
@@ -734,9 +830,11 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
                die(_("Need exactly one range."));
 
        o1 = rev->pending.objects[0].item;
-       flags1 = o1->flags;
        o2 = rev->pending.objects[1].item;
+       flags1 = o1->flags;
        flags2 = o2->flags;
+       c1 = lookup_commit_reference(o1->oid.hash);
+       c2 = lookup_commit_reference(o2->oid.hash);
 
        if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
                die(_("Not a range."));
@@ -758,10 +856,8 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
        }
 
        /* reset for next revision walk */
-       clear_commit_marks((struct commit *)o1,
-                       SEEN | UNINTERESTING | SHOWN | ADDED);
-       clear_commit_marks((struct commit *)o2,
-                       SEEN | UNINTERESTING | SHOWN | ADDED);
+       clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
+       clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
        o1->flags = flags1;
        o2->flags = flags2;
 }
@@ -777,8 +873,13 @@ static void gen_message_id(struct rev_info *info, char *base)
 
 static void print_signature(void)
 {
-       if (signature && *signature)
-               printf("-- \n%s\n\n", signature);
+       if (!signature || !*signature)
+               return;
+
+       printf("-- \n%s", signature);
+       if (signature[strlen(signature)-1] != '\n')
+               putchar('\n');
+       putchar('\n');
 }
 
 static void add_branch_description(struct strbuf *buf, const char *branch_name)
@@ -789,14 +890,43 @@ static void add_branch_description(struct strbuf *buf, const char *branch_name)
        read_branch_desc(&desc, branch_name);
        if (desc.len) {
                strbuf_addch(buf, '\n');
-               strbuf_add(buf, desc.buf, desc.len);
+               strbuf_addbuf(buf, &desc);
                strbuf_addch(buf, '\n');
        }
+       strbuf_release(&desc);
+}
+
+static char *find_branch_name(struct rev_info *rev)
+{
+       int i, positive = -1;
+       struct object_id branch_oid;
+       const struct object_id *tip_oid;
+       const char *ref, *v;
+       char *full_ref, *branch = NULL;
+
+       for (i = 0; i < rev->cmdline.nr; i++) {
+               if (rev->cmdline.rev[i].flags & UNINTERESTING)
+                       continue;
+               if (positive < 0)
+                       positive = i;
+               else
+                       return NULL;
+       }
+       if (positive < 0)
+               return NULL;
+       ref = rev->cmdline.rev[positive].name;
+       tip_oid = &rev->cmdline.rev[positive].item->oid;
+       if (dwim_ref(ref, strlen(ref), branch_oid.hash, &full_ref) &&
+           skip_prefix(full_ref, "refs/heads/", &v) &&
+           !oidcmp(tip_oid, &branch_oid))
+               branch = xstrdup(v);
+       free(full_ref);
+       return branch;
 }
 
 static void make_cover_letter(struct rev_info *rev, int use_stdout,
                              struct commit *origin,
-                             int nr, struct commit **list, struct commit *head,
+                             int nr, struct commit **list,
                              const char *branch_name,
                              int quiet)
 {
@@ -810,6 +940,7 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
        struct diff_options opts;
        int need_8bit_cte = 0;
        struct pretty_print_context pp = {0};
+       struct commit *head = list[0];
 
        if (rev->commit_format != CMIT_FMT_EMAIL)
                die(_("Cover letter needs email format"));
@@ -823,13 +954,19 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
        log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
                                &need_8bit_cte);
 
-       for (i = 0; !need_8bit_cte && i < nr; i++)
-               if (has_non_ascii(list[i]->buffer))
+       for (i = 0; !need_8bit_cte && i < nr; i++) {
+               const char *buf = get_commit_buffer(list[i], NULL);
+               if (has_non_ascii(buf))
                        need_8bit_cte = 1;
+               unuse_commit_buffer(list[i], buf);
+       }
+
+       if (!branch_name)
+               branch_name = find_branch_name(rev);
 
        msg = body;
        pp.fmt = CMIT_FMT_EMAIL;
-       pp.date_mode = DATE_RFC2822;
+       pp.date_mode.type = DATE_RFC2822;
        pp_user_info(&pp, NULL, &sb, committer, encoding);
        pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
        pp_remainder(&pp, &msg, &sb, 0);
@@ -859,8 +996,8 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 
        diff_setup_done(&opts);
 
-       diff_tree_sha1(origin->tree->object.sha1,
-                      head->tree->object.sha1,
+       diff_tree_sha1(origin->tree->object.oid.hash,
+                      head->tree->object.oid.hash,
                       "", &opts);
        diffcore_std(&opts);
        diff_flush(&opts);
@@ -913,7 +1050,7 @@ static const char *set_outdir(const char *prefix, const char *output_directory)
 }
 
 static const char * const builtin_format_patch_usage[] = {
-       N_("git format-patch [options] [<since> | <revision range>]"),
+       N_("git format-patch [<options>] [<since> | <revision-range>]"),
        NULL
 };
 
@@ -1033,43 +1170,19 @@ static int cc_callback(const struct option *opt, const char *arg, int unset)
        return 0;
 }
 
-static char *find_branch_name(struct rev_info *rev)
+static int from_callback(const struct option *opt, const char *arg, int unset)
 {
-       int i, positive = -1;
-       unsigned char branch_sha1[20];
-       const unsigned char *tip_sha1;
-       const char *ref;
-       char *full_ref, *branch = NULL;
+       char **from = opt->value;
 
-       for (i = 0; i < rev->cmdline.nr; i++) {
-               if (rev->cmdline.rev[i].flags & UNINTERESTING)
-                       continue;
-               if (positive < 0)
-                       positive = i;
-               else
-                       return NULL;
-       }
-       if (0 <= positive) {
-               ref = rev->cmdline.rev[positive].name;
-               tip_sha1 = rev->cmdline.rev[positive].item->sha1;
-       } else if (!rev->cmdline.nr && rev->pending.nr == 1 &&
-                  !strcmp(rev->pending.objects[0].name, "HEAD")) {
-               /*
-                * No actual ref from command line, but "HEAD" from
-                * rev->def was added in setup_revisions()
-                * e.g. format-patch --cover-letter -12
-                */
-               ref = "HEAD";
-               tip_sha1 = rev->pending.objects[0].item->sha1;
-       } else {
-               return NULL;
-       }
-       if (dwim_ref(ref, strlen(ref), branch_sha1, &full_ref) &&
-           !prefixcmp(full_ref, "refs/heads/") &&
-           !hashcmp(tip_sha1, branch_sha1))
-               branch = xstrdup(full_ref + strlen("refs/heads/"));
-       free(full_ref);
-       return branch;
+       free(*from);
+
+       if (unset)
+               *from = NULL;
+       else if (arg)
+               *from = xstrdup(arg);
+       else
+               *from = xstrdup(git_committer_info(IDENT_NO_DATE));
+       return 0;
 }
 
 int cmd_format_patch(int argc, const char **argv, const char *prefix)
@@ -1083,10 +1196,11 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        int start_number = -1;
        int just_numbers = 0;
        int ignore_if_in_upstream = 0;
-       int cover_letter = 0;
+       int cover_letter = -1;
        int boundary_count = 0;
        int no_binary_diff = 0;
-       struct commit *origin = NULL, *head = NULL;
+       int zero_commit = 0;
+       struct commit *origin = NULL;
        const char *in_reply_to = NULL;
        struct patch_ids ids;
        struct strbuf buf = STRBUF_INIT;
@@ -1094,6 +1208,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        int quiet = 0;
        int reroll_count = -1;
        char *branch_name = NULL;
+       char *from = NULL;
        const struct option builtin_format_patch_options[] = {
                { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
                            N_("use [PATCH n/m] even with a single patch"),
@@ -1101,12 +1216,12 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
                            N_("use [PATCH] even with multiple patches"),
                            PARSE_OPT_NOARG, no_numbered_callback },
-               OPT_BOOLEAN('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
-               OPT_BOOLEAN(0, "stdout", &use_stdout,
+               OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
+               OPT_BOOL(0, "stdout", &use_stdout,
                            N_("print patches to standard out")),
-               OPT_BOOLEAN(0, "cover-letter", &cover_letter,
+               OPT_BOOL(0, "cover-letter", &cover_letter,
                            N_("generate a cover letter")),
-               OPT_BOOLEAN(0, "numbered-files", &just_numbers,
+               OPT_BOOL(0, "numbered-files", &just_numbers,
                            N_("use simple number sequence for output file names")),
                OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
                            N_("use <sfx> instead of '.patch'")),
@@ -1123,13 +1238,15 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
                            N_("don't strip/add [PATCH]"),
                            PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
-               OPT_BOOLEAN(0, "no-binary", &no_binary_diff,
-                           N_("don't output binary diffs")),
-               OPT_BOOLEAN(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
-                           N_("don't include a patch matching a commit upstream")),
-               { OPTION_BOOLEAN, 'p', "no-stat", &use_patch_format, NULL,
+               OPT_BOOL(0, "no-binary", &no_binary_diff,
+                        N_("don't output binary diffs")),
+               OPT_BOOL(0, "zero-commit", &zero_commit,
+                        N_("output all-zero hash in From header")),
+               OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
+                        N_("don't include a patch matching a commit upstream")),
+               { OPTION_SET_INT, 'p', "no-stat", &use_patch_format, NULL,
                  N_("show patch format instead of default (patch + stat)"),
-                 PARSE_OPT_NONEG | PARSE_OPT_NOARG },
+                 PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1},
                OPT_GROUP(N_("Messaging")),
                { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
                            N_("add email header"), 0, header_callback },
@@ -1137,6 +1254,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                            0, to_callback },
                { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
                            0, cc_callback },
+               { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
+                           N_("set From address to <ident> (or committer ident if absent)"),
+                           PARSE_OPT_OPTARG, from_callback },
                OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
                            N_("make first mail a reply to <message-id>")),
                { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
@@ -1151,8 +1271,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                            PARSE_OPT_OPTARG, thread_callback },
                OPT_STRING(0, "signature", &signature, N_("signature"),
                            N_("add a signature")),
-               OPT_BOOLEAN(0, "quiet", &quiet,
-                           N_("don't print the patch filenames")),
+               OPT_FILENAME(0, "signature-file", &signature_file,
+                               N_("add a signature from a file")),
+               OPT__QUIET(&quiet, N_("don't print the patch filenames")),
                OPT_END()
        };
 
@@ -1224,6 +1345,11 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 
        rev.extra_headers = strbuf_detach(&buf, NULL);
 
+       if (from) {
+               if (split_ident_line(&rev.from_ident, from, strlen(from)))
+                       die(_("invalid ident line: %s"), from);
+       }
+
        if (start_number < 0)
                start_number = 1;
 
@@ -1260,12 +1386,17 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        /* Always generate a patch */
        rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
 
+       rev.zero_commit = zero_commit;
+
        if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
                DIFF_OPT_SET(&rev.diffopt, BINARY);
 
        if (rev.show_notes)
                init_display_notes(&rev.notes_opt);
 
+       if (!output_directory && !use_stdout)
+               output_directory = config_output_directory;
+
        if (!use_stdout)
                output_directory = set_outdir(prefix, output_directory);
        else
@@ -1280,28 +1411,37 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        }
 
        if (rev.pending.nr == 1) {
+               int check_head = 0;
+
                if (rev.max_count < 0 && !rev.show_root_diff) {
                        /*
                         * This is traditional behaviour of "git format-patch
                         * origin" that prepares what the origin side still
                         * does not have.
                         */
-                       unsigned char sha1[20];
-                       const char *ref;
-
                        rev.pending.objects[0].item->flags |= UNINTERESTING;
                        add_head_to_pending(&rev);
-                       ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
-                       if (ref && !prefixcmp(ref, "refs/heads/"))
-                               branch_name = xstrdup(ref + strlen("refs/heads/"));
-                       else
-                               branch_name = xstrdup(""); /* no branch */
+                       check_head = 1;
                }
                /*
                 * Otherwise, it is "format-patch -22 HEAD", and/or
                 * "format-patch --root HEAD".  The user wants
                 * get_revision() to do the usual traversal.
                 */
+
+               if (!strcmp(rev.pending.objects[0].name, "HEAD"))
+                       check_head = 1;
+
+               if (check_head) {
+                       unsigned char sha1[20];
+                       const char *ref, *v;
+                       ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
+                                                sha1, NULL);
+                       if (ref && skip_prefix(ref, "refs/heads/", &v))
+                               branch_name = xstrdup(v);
+                       else
+                               branch_name = xstrdup(""); /* no branch */
+               }
        }
 
        /*
@@ -1310,34 +1450,11 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
         */
        rev.show_root_diff = 1;
 
-       if (cover_letter) {
-               /*
-                * NEEDSWORK:randomly pick one positive commit to show
-                * diffstat; this is often the tip and the command
-                * happens to do the right thing in most cases, but a
-                * complex command like "--cover-letter a b c ^bottom"
-                * picks "c" and shows diffstat between bottom..c
-                * which may not match what the series represents at
-                * all and totally broken.
-                */
-               int i;
-               for (i = 0; i < rev.pending.nr; i++) {
-                       struct object *o = rev.pending.objects[i].item;
-                       if (!(o->flags & UNINTERESTING))
-                               head = (struct commit *)o;
-               }
-               /* There is nothing to show; it is not an error, though. */
-               if (!head)
-                       return 0;
-               if (!branch_name)
-                       branch_name = find_branch_name(&rev);
-       }
-
        if (ignore_if_in_upstream) {
                /* Don't say anything if head and upstream are the same. */
                if (rev.pending.nr == 2) {
                        struct object_array_entry *o = rev.pending.objects;
-                       if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
+                       if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
                                return 0;
                }
                get_patch_ids(&rev, &ids);
@@ -1356,19 +1473,40 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                        continue;
                }
 
-               if (ignore_if_in_upstream &&
-                               has_commit_patch_id(commit, &ids))
+               if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
                        continue;
 
                nr++;
-               list = xrealloc(list, nr * sizeof(list[0]));
+               REALLOC_ARRAY(list, nr);
                list[nr - 1] = commit;
        }
+       if (nr == 0)
+               /* nothing to do */
+               return 0;
        total = nr;
        if (!keep_subject && auto_number && total > 1)
                numbered = 1;
        if (numbered)
                rev.total = total + start_number - 1;
+       if (cover_letter == -1) {
+               if (config_cover_letter == COVER_AUTO)
+                       cover_letter = (total > 1);
+               else
+                       cover_letter = (config_cover_letter == COVER_ON);
+       }
+
+       if (!signature) {
+               ; /* --no-signature inhibits all signatures */
+       } else if (signature && signature != git_version_string) {
+               ; /* non-default signature already set */
+       } else if (signature_file) {
+               struct strbuf buf = STRBUF_INIT;
+
+               if (strbuf_read_file(&buf, signature_file, 128) < 0)
+                       die_errno(_("unable to read signature file '%s'"), signature_file);
+               signature = strbuf_detach(&buf, NULL);
+       }
+
        if (in_reply_to || thread || cover_letter)
                rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
        if (in_reply_to) {
@@ -1381,7 +1519,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                if (thread)
                        gen_message_id(&rev, "cover");
                make_cover_letter(&rev, use_stdout,
-                                 origin, nr, list, head, branch_name, quiet);
+                                 origin, nr, list, branch_name, quiet);
                total++;
                start_number--;
        }
@@ -1423,15 +1561,14 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                                        string_list_append(rev.ref_message_ids,
                                                           rev.message_id);
                        }
-                       gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
+                       gen_message_id(&rev, oid_to_hex(&commit->object.oid));
                }
 
                if (!use_stdout &&
                    reopen_stdout(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
                        die(_("Failed to create output files"));
                shown = log_tree_commit(&rev, commit);
-               free(commit->buffer);
-               commit->buffer = NULL;
+               free_commit_buffer(commit);
 
                /* We put one extra blank line between formatted
                 * patches and this flag is used by log-tree code
@@ -1486,12 +1623,12 @@ static void print_commit(char sign, struct commit *commit, int verbose,
 {
        if (!verbose) {
                printf("%c %s\n", sign,
-                      find_unique_abbrev(commit->object.sha1, abbrev));
+                      find_unique_abbrev(commit->object.oid.hash, abbrev));
        } else {
                struct strbuf buf = STRBUF_INIT;
                pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
                printf("%c %s %s\n", sign,
-                      find_unique_abbrev(commit->object.sha1, abbrev),
+                      find_unique_abbrev(commit->object.oid.hash, abbrev),
                       buf.buf);
                strbuf_release(&buf);
        }
@@ -1529,16 +1666,13 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
                break;
        default:
                current_branch = branch_get(NULL);
-               if (!current_branch || !current_branch->merge
-                                       || !current_branch->merge[0]
-                                       || !current_branch->merge[0]->dst) {
+               upstream = branch_get_upstream(current_branch, NULL);
+               if (!upstream) {
                        fprintf(stderr, _("Could not find a tracked"
                                        " remote branch, please"
                                        " specify <upstream> manually.\n"));
                        usage_with_options(cherry_usage, options);
                }
-
-               upstream = current_branch->merge[0]->dst;
        }
 
        init_revisions(&revs, prefix);
@@ -1552,7 +1686,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
        /* Don't say anything if head and upstream are the same. */
        if (revs.pending.nr == 2) {
                struct object_array_entry *o = revs.pending.objects;
-               if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
+               if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
                        return 0;
        }