Merge branch 'maint'

diff --git a/builtin-checkout.c b/builtin-checkout.c
index f6f8f086de980b5bc19ca59985a2b0d8201831d9..efdb1e02bf21fb3b901d375a547d7fbf44e0894b 100644 (file)
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -157,7 +157,7 @@ struct checkout_opts {
        int force;
        int writeout_error;
 
-       char *new_branch;
+       const char *new_branch;
        int new_branch_log;
        enum branch_track track;
 };
@@ -435,13 +435,28 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 
        git_config(git_default_config, NULL);
 
-       opts.track = git_branch_track;
+       opts.track = BRANCH_TRACK_UNSPECIFIED;
 
        argc = parse_options(argc, argv, options, checkout_usage,
                             PARSE_OPT_KEEP_DASHDASH);
 
-       if (!opts.new_branch && (opts.track != git_branch_track))
-               die("git checkout: --track and --no-track require -b");
+       /* --track without -b should DWIM */
+       if (0 < opts.track && !opts.new_branch) {
+               const char *argv0 = argv[0];
+               if (!argc || !strcmp(argv0, "--"))
+                       die ("--track needs a branch name");
+               if (!prefixcmp(argv0, "refs/"))
+                       argv0 += 5;
+               if (!prefixcmp(argv0, "remotes/"))
+                       argv0 += 8;
+               argv0 = strchr(argv0, '/');
+               if (!argv0 || !argv0[1])
+                       die ("Missing branch name; try -b");
+               opts.new_branch = argv0 + 1;
+       }
+
+       if (opts.track == BRANCH_TRACK_UNSPECIFIED)
+               opts.track = git_branch_track;
 
        if (opts.force && opts.merge)
                die("git checkout: -f and -m are incompatible");