Merge branch 'mg/replace-resolve-delete'

Be more user friendly to people using "git replace -d".

* mg/replace-resolve-delete:
  replace: parse revision argument for -d

builtin/replace.c

@@ -46,24 +46,27 @@ typedef int (*each_replace_name_fn)(const char *name, const char *ref,
 
 static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
 {
-	const char **p;
+	const char **p, *full_hex;
 	char ref[PATH_MAX];
 	int had_error = 0;
 	unsigned char sha1[20];
 
 	for (p = argv; *p; p++) {
-		if (snprintf(ref, sizeof(ref), "refs/replace/%s", *p)
-					>= sizeof(ref)) {
-			error("replace ref name too long: %.*s...", 50, *p);
+		if (get_sha1(*p, sha1)) {
+			error("Failed to resolve '%s' as a valid ref.", *p);
 			had_error = 1;
 			continue;
 		}
+		full_hex = sha1_to_hex(sha1);
+		snprintf(ref, sizeof(ref), "refs/replace/%s", full_hex);
+		/* read_ref() may reuse the buffer */
+		full_hex = ref + strlen("refs/replace/");
 		if (read_ref(ref, sha1)) {
-			error("replace ref '%s' not found.", *p);
+			error("replace ref '%s' not found.", full_hex);
 			had_error = 1;
 			continue;
 		}
-		if (fn(*p, ref, sha1))
+		if (fn(full_hex, ref, sha1))
 			had_error = 1;
 	}
 	return had_error;

t/t6050-replace.sh

@@ -140,6 +140,17 @@ test_expect_success '"git replace" replacing' '
      test "$HASH2" = "$(git replace)"
 '
 
+test_expect_success '"git replace" resolves sha1' '
+     SHORTHASH2=$(git rev-parse --short=8 $HASH2) &&
+     git replace -d $SHORTHASH2 &&
+     git replace $SHORTHASH2 $R &&
+     git show $HASH2 | grep "O Thor" &&
+     test_must_fail git replace $HASH2 $R &&
+     git replace -f $HASH2 $R &&
+     test_must_fail git replace -f &&
+     test "$HASH2" = "$(git replace)"
+'
+
 # This creates a side branch where the bug in H2
 # does not appear because P2 is created by applying
 # H2 and squashing H5 into it.