t0051: test GIT_TRACE to a windows named pipe

diff --git a/refs.c b/refs.c
index dabcd850a9eb8c08dca8fe5c7d636a6271cbff20..0eb379f9312fd9f167fea2e0f148c85c47cd2ff0 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -681,10 +681,21 @@ static int write_pseudoref(const char *pseudoref, const struct object_id *oid,
        if (old_oid) {
                struct object_id actual_old_oid;
 
-               if (read_ref(pseudoref, &actual_old_oid))
-                       die("could not read ref '%s'", pseudoref);
-               if (oidcmp(&actual_old_oid, old_oid)) {
-                       strbuf_addf(err, "unexpected sha1 when writing '%s'", pseudoref);
+               if (read_ref(pseudoref, &actual_old_oid)) {
+                       if (!is_null_oid(old_oid)) {
+                               strbuf_addf(err, "could not read ref '%s'",
+                                           pseudoref);
+                               rollback_lock_file(&lock);
+                               goto done;
+                       }
+               } else if (is_null_oid(old_oid)) {
+                       strbuf_addf(err, "ref '%s' already exists",
+                                   pseudoref);
+                       rollback_lock_file(&lock);
+                       goto done;
+               } else if (oidcmp(&actual_old_oid, old_oid)) {
+                       strbuf_addf(err, "unexpected object ID when writing '%s'",
+                                   pseudoref);
                        rollback_lock_file(&lock);
                        goto done;
                }
@@ -725,7 +736,8 @@ static int delete_pseudoref(const char *pseudoref, const struct object_id *old_o
                if (read_ref(pseudoref, &actual_old_oid))
                        die("could not read ref '%s'", pseudoref);
                if (oidcmp(&actual_old_oid, old_oid)) {
-                       warning("Unexpected sha1 when deleting %s", pseudoref);
+                       error("unexpected object ID when deleting '%s'",
+                             pseudoref);
                        rollback_lock_file(&lock);
                        return -1;
                }
@@ -1150,8 +1162,8 @@ char *shorten_unambiguous_ref(const char *refname, int strict)
                for (i = 0; i < nr_rules; i++) {
                        assert(offset < total_len);
                        scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
-                       offset += snprintf(scanf_fmts[i], total_len - offset,
-                                          ref_rev_parse_rules[i], 2, "%s") + 1;
+                       offset += xsnprintf(scanf_fmts[i], total_len - offset,
+                                           ref_rev_parse_rules[i], 2, "%s") + 1;
                }
        }