show-branch --reflog: tighten input validation.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-show-branch.c b/builtin-show-branch.c
index 452c15fd1b6164f9d33aeb6652c394054b280d7d..651d27c2c0f7266b789e2939e5bffc854c70c8fe 100644 (file)
--- a/builtin-show-branch.c
+++ b/builtin-show-branch.c
@@ -4,7 +4,9 @@
 #include "builtin.h"
 
 static const char show_branch_usage[] =
-"git-show-branch [--sparse] [--current] [--all] [--remotes] [--topo-order] [--more=count | --list | --independent | --merge-base ] [--topics] [<refs>...] | --reflog[=n] <branch>";
+"git-show-branch [--sparse] [--current] [--all] [--remotes] [--topo-order] [--more=count | --list | --independent | --merge-base ] [--topics] [<refs>...] | --reflog[=n[,b]] <branch>";
+static const char show_branch_usage_reflog[] =
+"--reflog is incompatible with --all, --remotes, --independent or --merge-base";
 
 static int default_num;
 static int default_alloc;
@@ -664,12 +666,14 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
                 */
                if (independent || merge_base)
                        usage(show_branch_usage);
-               if (!!reflog && (0 < extra))
+               if (!!reflog && ((0 < extra) || all_heads || all_remotes))
                        /*
                         * Asking for --more in reflog mode does not
-                        * make sense.
+                        * make sense.  --list is Ok.
+                        *
+                        * Also --all and --remotes do not make sense either.
                         */
-                       usage(show_branch_usage);
+                       usage(show_branch_usage_reflog);
        }
 
        /* If nothing is specified, show all branches by default */
@@ -685,6 +689,9 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
                int base = 0;
                if (ac != 1)
                        die("--reflog option needs one branch name");
+               if (MAX_REVS < reflog)
+                       die("Only %d entries can be shown at one time.",
+                           MAX_REVS);
                if (!dwim_ref(*av, strlen(*av), sha1, &ref))
                        die("No such ref %s", *av);