mergetool: don't require a work tree for --tool-help

diff --git a/revision.c b/revision.c
index 71e233742331a435edeadacc7c6a52226bb18b7a..2571ada6bf66ce6e945c539be4b0123e5b9648a9 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -1633,6 +1633,7 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
            !strcmp(arg, "--reflog") || !strcmp(arg, "--not") ||
            !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk") ||
            !strcmp(arg, "--bisect") || starts_with(arg, "--glob=") ||
+           starts_with(arg, "--exclude=") ||
            starts_with(arg, "--branches=") || starts_with(arg, "--tags=") ||
            starts_with(arg, "--remotes=") || starts_with(arg, "--no-walk="))
        {
@@ -1648,8 +1649,10 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->skip_count = atoi(optarg);
                return argcount;
        } else if ((*arg == '-') && isdigit(arg[1])) {
-       /* accept -<digit>, like traditional "head" */
-               revs->max_count = atoi(arg + 1);
+               /* accept -<digit>, like traditional "head" */
+               if (strtol_i(arg + 1, 10, &revs->max_count) < 0 ||
+                   revs->max_count < 0)
+                       die("'%s': not a non-negative integer", arg + 1);
                revs->no_walk = 0;
        } else if (!strcmp(arg, "-n")) {
                if (argc <= 1)
@@ -2788,7 +2791,7 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
 {
        int retval;
        const char *encoding;
-       char *message;
+       const char *message;
        struct strbuf buf = STRBUF_INIT;
 
        if (!opt->grep_filter.pattern_list && !opt->grep_filter.header_list)
@@ -2830,14 +2833,21 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
                format_display_notes(commit->object.sha1, &buf, encoding, 1);
        }
 
-       /* Find either in the original commit message, or in the temporary */
+       /*
+        * Find either in the original commit message, or in the temporary.
+        * Note that we cast away the constness of "message" here. It is
+        * const because it may come from the cached commit buffer. That's OK,
+        * because we know that it is modifiable heap memory, and that while
+        * grep_buffer may modify it for speed, it will restore any
+        * changes before returning.
+        */
        if (buf.len)
                retval = grep_buffer(&opt->grep_filter, buf.buf, buf.len);
        else
                retval = grep_buffer(&opt->grep_filter,
-                                    message, strlen(message));
+                                    (char *)message, strlen(message));
        strbuf_release(&buf);
-       logmsg_free(message, commit);
+       unuse_commit_buffer(commit, message);
        return retval;
 }