Merge branch 'sg/commit-cleanup-scissors'

diff --git a/refs.c b/refs.c
index a742d7925dfbd08ff7623427b74183406fdb85ec..7ac05cf21a25802f8e16d45ef75e37b7de2cda8a 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -1373,19 +1373,34 @@ static void read_loose_refs(const char *dirname, struct ref_dir *dir)
                                         create_dir_entry(refs, refname.buf,
                                                          refname.len, 1));
                } else {
+                       int read_ok;
+
                        if (*refs->name) {
                                hashclr(sha1);
                                flag = 0;
-                               if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) {
-                                       hashclr(sha1);
-                                       flag |= REF_ISBROKEN;
-                               }
-                       } else if (read_ref_full(refname.buf,
-                                                RESOLVE_REF_READING,
-                                                sha1, &flag)) {
+                               read_ok = !resolve_gitlink_ref(refs->name,
+                                                              refname.buf, sha1);
+                       } else {
+                               read_ok = !read_ref_full(refname.buf,
+                                                        RESOLVE_REF_READING,
+                                                        sha1, &flag);
+                       }
+
+                       if (!read_ok) {
                                hashclr(sha1);
                                flag |= REF_ISBROKEN;
+                       } else if (is_null_sha1(sha1)) {
+                               /*
+                                * It is so astronomically unlikely
+                                * that NULL_SHA1 is the SHA-1 of an
+                                * actual object that we consider its
+                                * appearance in a loose reference
+                                * file to be repo corruption
+                                * (probably due to a software bug).
+                                */
+                               flag |= REF_ISBROKEN;
                        }
+
                        if (check_refname_format(refname.buf,
                                                 REFNAME_ALLOW_ONELEVEL)) {
                                if (!refname_is_safe(refname.buf))
@@ -2219,27 +2234,35 @@ static void unlock_ref(struct ref_lock *lock)
        free(lock);
 }
 
-/* This function should make sure errno is meaningful on error */
-static struct ref_lock *verify_lock(struct ref_lock *lock,
-       const unsigned char *old_sha1, int mustexist)
+/*
+ * Verify that the reference locked by lock has the value old_sha1.
+ * Fail if the reference doesn't exist and mustexist is set. Return 0
+ * on success. On error, write an error message to err, set errno, and
+ * return a negative value.
+ */
+static int verify_lock(struct ref_lock *lock,
+                      const unsigned char *old_sha1, int mustexist,
+                      struct strbuf *err)
 {
+       assert(err);
+
        if (read_ref_full(lock->ref_name,
                          mustexist ? RESOLVE_REF_READING : 0,
                          lock->old_oid.hash, NULL)) {
                int save_errno = errno;
-               error("Can't verify ref %s", lock->ref_name);
-               unlock_ref(lock);
+               strbuf_addf(err, "can't verify ref %s", lock->ref_name);
                errno = save_errno;
-               return NULL;
+               return -1;
        }
        if (hashcmp(lock->old_oid.hash, old_sha1)) {
-               error("Ref %s is at %s but expected %s", lock->ref_name,
-                       oid_to_hex(&lock->old_oid), sha1_to_hex(old_sha1));
-               unlock_ref(lock);
+               strbuf_addf(err, "ref %s is at %s but expected %s",
+                           lock->ref_name,
+                           sha1_to_hex(lock->old_oid.hash),
+                           sha1_to_hex(old_sha1));
                errno = EBUSY;
-               return NULL;
+               return -1;
        }
-       return lock;
+       return 0;
 }
 
 static int remove_empty_directories(const char *file)
@@ -2467,7 +2490,11 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
                        goto error_return;
                }
        }
-       return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
+       if (old_sha1 && verify_lock(lock, old_sha1, mustexist, err)) {
+               last_errno = errno;
+               goto error_return;
+       }
+       return lock;
 
  error_return:
        unlock_ref(lock);
@@ -3912,7 +3939,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
                                ? TRANSACTION_NAME_CONFLICT
                                : TRANSACTION_GENERIC_ERROR;
                        reason = strbuf_detach(err, NULL);
-                       strbuf_addf(err, "Cannot lock ref '%s': %s",
+                       strbuf_addf(err, "cannot lock ref '%s': %s",
                                    update->refname, reason);
                        free(reason);
                        goto cleanup;
@@ -3935,7 +3962,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
                                 * write_ref_to_lockfile():
                                 */
                                update->lock = NULL;
-                               strbuf_addf(err, "Cannot update the ref '%s'.",
+                               strbuf_addf(err, "cannot update the ref '%s'.",
                                            update->refname);
                                ret = TRANSACTION_GENERIC_ERROR;
                                goto cleanup;