unpack-trees: allow Porcelain to give different error messages

diff --git a/builtin-show-branch.c b/builtin-show-branch.c
index b9cf1b379f60d42408eb75009e57030173448d8c..019abd3527e7c573c69900a58313749e2ef2280a 100644 (file)
--- a/builtin-show-branch.c
+++ b/builtin-show-branch.c
@@ -259,16 +259,15 @@ static void join_revs(struct commit_list **list_p,
 
 static void show_one_commit(struct commit *commit, int no_name)
 {
-       char *pretty = NULL;
+       struct strbuf pretty;
        const char *pretty_str = "(unavailable)";
-       unsigned long pretty_len = 0;
        struct commit_name *name = commit->util;
 
+       strbuf_init(&pretty, 0);
        if (commit->object.parsed) {
-               pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
-                                   &pretty, &pretty_len,
-                                   0, NULL, NULL, 0, 0);
-               pretty_str = pretty;
+               pretty_print_commit(CMIT_FMT_ONELINE, commit,
+                                   &pretty, 0, NULL, NULL, 0, 0);
+               pretty_str = pretty.buf;
        }
        if (!prefixcmp(pretty_str, "[PATCH] "))
                pretty_str += 8;
@@ -289,7 +288,7 @@ static void show_one_commit(struct commit *commit, int no_name)
                               find_unique_abbrev(commit->object.sha1, 7));
        }
        puts(pretty_str);
-       free(pretty);
+       strbuf_release(&pretty);
 }
 
 static char *ref_name[MAX_REVS + 1];
@@ -537,6 +536,8 @@ static void append_one_rev(const char *av)
 static int git_show_branch_config(const char *var, const char *value)
 {
        if (!strcmp(var, "showbranch.default")) {
+               if (!value)
+                       return config_error_nonbool(var);
                if (default_alloc <= default_num + 1) {
                        default_alloc = default_alloc * 3 / 2 + 20;
                        default_arg = xrealloc(default_arg, sizeof *default_arg * default_alloc);