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-rw-r--r--revision.c17
-rwxr-xr-xt/t4202-log.sh14
2 files changed, 30 insertions, 1 deletions
diff --git a/revision.c b/revision.c
index ab97ffd459..9b9d77dc43 100644
--- a/revision.c
+++ b/revision.c
@@ -2173,6 +2173,21 @@ static int handle_revision_pseudo_opt(const char *submodule,
return 1;
}
+static void NORETURN diagnose_missing_default(const char *def)
+{
+ unsigned char sha1[20];
+ int flags;
+ const char *refname;
+
+ refname = resolve_ref_unsafe(def, 0, sha1, &flags);
+ if (!refname || !(flags & REF_ISSYMREF) || (flags & REF_ISBROKEN))
+ die(_("your current branch appears to be broken"));
+
+ skip_prefix(refname, "refs/heads/", &refname);
+ die(_("your current branch '%s' does not have any commits yet"),
+ refname);
+}
+
/*
* Parse revision information, filling in the "rev_info" structure,
* and removing the used arguments from the argument list.
@@ -2302,7 +2317,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
struct object *object;
struct object_context oc;
if (get_sha1_with_context(revs->def, 0, sha1, &oc))
- die("bad default revision '%s'", revs->def);
+ diagnose_missing_default(revs->def);
object = get_reference(revs, revs->def, sha1, 0);
add_pending_object_with_mode(revs, object, revs->def, oc.mode);
}
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 1b2e981a00..19277dd361 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -871,4 +871,18 @@ test_expect_success 'log --graph --no-walk is forbidden' '
test_must_fail git log --graph --no-walk
'
+test_expect_success 'log diagnoses bogus HEAD' '
+ git init empty &&
+ test_must_fail git -C empty log 2>stderr &&
+ test_i18ngrep does.not.have.any.commits stderr &&
+ echo 1234abcd >empty/.git/refs/heads/master &&
+ test_must_fail git -C empty log 2>stderr &&
+ test_i18ngrep broken stderr &&
+ echo "ref: refs/heads/invalid.lock" >empty/.git/HEAD &&
+ test_must_fail git -C empty log 2>stderr &&
+ test_i18ngrep broken stderr &&
+ test_must_fail git -C empty log --default totally-bogus 2>stderr &&
+ test_i18ngrep broken stderr
+'
+
test_done