Update repack_without_refs to take an err argument and update it if there
is a failure. Pass the err variable from ref_transaction_commit to this
function so that callers can print a meaningful error message if _commit
fails due to this function.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 builtin/remote.c |  5 +++--
 refs.c           | 19 ++++++++++++++-----
 refs.h           |  3 ++-
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/builtin/remote.c b/builtin/remote.c
index c9102e8..401feb3 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -755,7 +755,7 @@ static int remove_branches(struct string_list *branches)
        branch_names = xmalloc(branches->nr * sizeof(*branch_names));
        for (i = 0; i < branches->nr; i++)
                branch_names[i] = branches->items[i].string;
-       result |= repack_without_refs(branch_names, branches->nr);
+       result |= repack_without_refs(branch_names, branches->nr, NULL);
        free(branch_names);
 
        for (i = 0; i < branches->nr; i++) {
@@ -1333,7 +1333,8 @@ static int prune_remote(const char *remote, int dry_run)
                for (i = 0; i < states.stale.nr; i++)
                        delete_refs[i] = states.stale.items[i].util;
                if (!dry_run)
-                       result |= repack_without_refs(delete_refs, 
states.stale.nr);
+                       result |= repack_without_refs(delete_refs,
+                                                     states.stale.nr, NULL);
                free(delete_refs);
        }
 
diff --git a/refs.c b/refs.c
index e9d53e4..67a0217 100644
--- a/refs.c
+++ b/refs.c
@@ -2456,12 +2456,12 @@ static int curate_packed_ref_fn(struct ref_entry 
*entry, void *cb_data)
        return 0;
 }
 
-int repack_without_refs(const char **refnames, int n)
+int repack_without_refs(const char **refnames, int n, struct strbuf *err)
 {
        struct ref_dir *packed;
        struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
        struct string_list_item *ref_to_delete;
-       int i, removed = 0;
+       int i, ret, removed = 0;
 
        /* Look for a packed ref */
        for (i = 0; i < n; i++)
@@ -2473,6 +2473,11 @@ int repack_without_refs(const char **refnames, int n)
                return 0; /* no refname exists in packed refs */
 
        if (lock_packed_refs(0)) {
+               if (err) {
+                       unable_to_lock_message(git_path("packed-refs"), errno,
+                                              err);
+                       return -1;
+               }
                unable_to_lock_error(git_path("packed-refs"), errno);
                return error("cannot delete '%s' from packed refs", 
refnames[i]);
        }
@@ -2499,12 +2504,16 @@ int repack_without_refs(const char **refnames, int n)
        }
 
        /* Write what remains */
-       return commit_packed_refs();
+       ret = commit_packed_refs();
+       if (ret && err)
+               strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
+                           strerror(errno));
+       return ret;
 }
 
 static int repack_without_ref(const char *refname)
 {
-       return repack_without_refs(&refname, 1);
+       return repack_without_refs(&refname, 1, NULL);
 }
 
 static int delete_ref_loose(struct ref_lock *lock, int flag)
@@ -3508,7 +3517,7 @@ int ref_transaction_commit(struct ref_transaction 
*transaction,
                }
        }
 
-       ret |= repack_without_refs(delnames, delnum);
+       ret |= repack_without_refs(delnames, delnum, err);
        for (i = 0; i < delnum; i++)
                unlink_or_warn(git_path("logs/%s", delnames[i]));
        clear_loose_ref_cache(&ref_cache);
diff --git a/refs.h b/refs.h
index 64f25d9..65f7637 100644
--- a/refs.h
+++ b/refs.h
@@ -122,7 +122,8 @@ extern void rollback_packed_refs(void);
  */
 int pack_refs(unsigned int flags);
 
-extern int repack_without_refs(const char **refnames, int n);
+extern int repack_without_refs(const char **refnames, int n,
+                              struct strbuf *err);
 
 extern int ref_exists(const char *);
 
-- 
2.0.0.438.g337c581

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