Get rid of the action_on_err enum and replace the action argument to
update_ref with a strbuf *err for error reporting.

Update all callers to the new api including two callers in transport*.c
which used the literal 0 instead of an enum.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 builtin/checkout.c   |  7 +++++--
 builtin/clone.c      | 23 +++++++++++++++--------
 builtin/merge.c      | 20 +++++++++++++-------
 builtin/notes.c      | 24 ++++++++++++++----------
 builtin/reset.c      | 12 ++++++++----
 builtin/update-ref.c |  7 +++++--
 notes-cache.c        |  2 +-
 notes-utils.c        |  5 +++--
 refs.c               | 14 +++-----------
 refs.h               | 10 ++--------
 transport-helper.c   |  7 ++++++-
 transport.c          |  9 ++++++---
 12 files changed, 81 insertions(+), 59 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 808c58f..a9ec5be 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -580,6 +580,8 @@ static void update_refs_for_switch(const struct 
checkout_opts *opts,
 {
        struct strbuf msg = STRBUF_INIT;
        const char *old_desc, *reflog_msg;
+       struct strbuf err = STRBUF_INIT;
+
        if (opts->new_branch) {
                if (opts->new_orphan_branch) {
                        if (opts->new_branch_log && !log_all_ref_updates) {
@@ -617,8 +619,9 @@ static void update_refs_for_switch(const struct 
checkout_opts *opts,
        if (!strcmp(new->name, "HEAD") && !new->path && !opts->force_detach) {
                /* Nothing to do. */
        } else if (opts->force_detach || !new->path) {  /* No longer on any 
branch. */
-               update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL,
-                          REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
+               if (update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL,
+                              REF_NODEREF, &err))
+                       die("%s", err.buf);
                if (!opts->quiet) {
                        if (old->path && advice_detached_head)
                                detach_advice(new->name);
diff --git a/builtin/clone.c b/builtin/clone.c
index 7737e12..99e23cf 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -521,6 +521,7 @@ static void write_remote_refs(const struct ref *local_refs)
 static void write_followtags(const struct ref *refs, const char *msg)
 {
        const struct ref *ref;
+       struct strbuf err = STRBUF_INIT;
        for (ref = refs; ref; ref = ref->next) {
                if (!starts_with(ref->name, "refs/tags/"))
                        continue;
@@ -528,8 +529,9 @@ static void write_followtags(const struct ref *refs, const 
char *msg)
                        continue;
                if (!has_sha1_file(ref->old_sha1))
                        continue;
-               update_ref(msg, ref->name, ref->old_sha1,
-                          NULL, 0, UPDATE_REFS_DIE_ON_ERR);
+               if (update_ref(msg, ref->name, ref->old_sha1,
+                              NULL, 0, &err))
+                       die("%s", err.buf);
        }
 }
 
@@ -592,28 +594,33 @@ static void update_remote_refs(const struct ref *refs,
 static void update_head(const struct ref *our, const struct ref *remote,
                        const char *msg)
 {
+       struct strbuf err = STRBUF_INIT;
+
        if (our && starts_with(our->name, "refs/heads/")) {
                /* Local default branch link */
                create_symref("HEAD", our->name, NULL);
                if (!option_bare) {
                        const char *head = skip_prefix(our->name, 
"refs/heads/");
-                       update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
-                                  UPDATE_REFS_DIE_ON_ERR);
+                       if (update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
+                                      &err))
+                               die("%s", err.buf);
                        install_branch_config(0, head, option_origin, 
our->name);
                }
        } else if (our) {
                struct commit *c = lookup_commit_reference(our->old_sha1);
                /* --branch specifies a non-branch (i.e. tags), detach HEAD */
-               update_ref(msg, "HEAD", c->object.sha1,
-                          NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
+               if (update_ref(msg, "HEAD", c->object.sha1,
+                              NULL, REF_NODEREF, &err))
+                       die("%s", err.buf);
        } else if (remote) {
                /*
                 * We know remote HEAD points to a non-branch, or
                 * HEAD points to a branch but we don't know which one.
                 * Detach HEAD in all these cases.
                 */
-               update_ref(msg, "HEAD", remote->old_sha1,
-                          NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
+         if (update_ref(msg, "HEAD", remote->old_sha1,
+                        NULL, REF_NODEREF, &err))
+               die("%s", err.buf);
        }
 }
 
diff --git a/builtin/merge.c b/builtin/merge.c
index 428ca24..17dda64 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -396,9 +396,11 @@ static void finish(struct commit *head_commit,
                        printf(_("No merge message -- not updating HEAD\n"));
                else {
                        const char *argv_gc_auto[] = { "gc", "--auto", NULL };
-                       update_ref(reflog_message.buf, "HEAD",
-                               new_head, head, 0,
-                               UPDATE_REFS_DIE_ON_ERR);
+                       struct strbuf err = STRBUF_INIT;
+                       if (update_ref(reflog_message.buf, "HEAD",
+                                      new_head, head, 0,
+                                      &err))
+                               die("%s", err.buf);
                        /*
                         * We ignore errors in 'gc --auto', since the
                         * user should see them.
@@ -1093,6 +1095,7 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
        unsigned char head_sha1[20];
        struct commit *head_commit;
        struct strbuf buf = STRBUF_INIT;
+       struct strbuf err = STRBUF_INIT;
        const char *head_arg;
        int flag, i, ret = 0, head_subsumed;
        int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0;
@@ -1221,8 +1224,9 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
                if (!remote_head)
                        die(_("%s - not something we can merge"), argv[0]);
                read_empty(remote_head->object.sha1, 0);
-               update_ref("initial pull", "HEAD", remote_head->object.sha1,
-                          NULL, 0, UPDATE_REFS_DIE_ON_ERR);
+               if (update_ref("initial pull", "HEAD", remote_head->object.sha1,
+                              NULL, 0, &err))
+                       die("%s", err.buf);
                goto done;
        } else {
                struct strbuf merge_names = STRBUF_INIT;
@@ -1338,8 +1342,10 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
                free(list);
        }
 
-       update_ref("updating ORIG_HEAD", "ORIG_HEAD", head_commit->object.sha1,
-                  NULL, 0, UPDATE_REFS_DIE_ON_ERR);
+       if (update_ref("updating ORIG_HEAD", "ORIG_HEAD",
+                      head_commit->object.sha1,
+                      NULL, 0, &err))
+               die("%s", err.buf);
 
        if (remoteheads && !common)
                ; /* No common ancestors found. We need a real merge. */
diff --git a/builtin/notes.c b/builtin/notes.c
index 820c341..f508fbd 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -675,6 +675,7 @@ static int merge_abort(struct notes_merge_options *o)
 static int merge_commit(struct notes_merge_options *o)
 {
        struct strbuf msg = STRBUF_INIT;
+       struct strbuf err = STRBUF_INIT;
        unsigned char sha1[20], parent_sha1[20];
        struct notes_tree *t;
        struct commit *partial;
@@ -715,10 +716,10 @@ static int merge_commit(struct notes_merge_options *o)
        format_commit_message(partial, "%s", &msg, &pretty_ctx);
        strbuf_trim(&msg);
        strbuf_insert(&msg, 0, "notes: ", 7);
-       update_ref(msg.buf, o->local_ref, sha1,
-                  is_null_sha1(parent_sha1) ? NULL : parent_sha1,
-                  0, UPDATE_REFS_DIE_ON_ERR);
-
+       if (update_ref(msg.buf, o->local_ref, sha1,
+                      is_null_sha1(parent_sha1) ? NULL : parent_sha1,
+                      0, &err))
+               die("%s", err.buf);
        free_notes(t);
        strbuf_release(&msg);
        ret = merge_abort(o);
@@ -729,6 +730,7 @@ static int merge_commit(struct notes_merge_options *o)
 static int merge(int argc, const char **argv, const char *prefix)
 {
        struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
+       struct strbuf err = STRBUF_INIT;
        unsigned char result_sha1[20];
        struct notes_tree *t;
        struct notes_merge_options o;
@@ -809,14 +811,16 @@ static int merge(int argc, const char **argv, const char 
*prefix)
 
        result = notes_merge(&o, t, result_sha1);
 
-       if (result >= 0) /* Merge resulted (trivially) in result_sha1 */
+       if (result >= 0) {/* Merge resulted (trivially) in result_sha1 */
                /* Update default notes ref with new commit */
-               update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
-                          0, UPDATE_REFS_DIE_ON_ERR);
-       else { /* Merge has unresolved conflicts */
+               if (update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
+                              0, &err))
+                       die("%s", err.buf);
+       } else { /* Merge has unresolved conflicts */
                /* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
-               update_ref(msg.buf, "NOTES_MERGE_PARTIAL", result_sha1, NULL,
-                          0, UPDATE_REFS_DIE_ON_ERR);
+               if (update_ref(msg.buf, "NOTES_MERGE_PARTIAL", result_sha1, 
NULL,
+                              0, &err))
+                       die("%s", err.buf);
                /* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
                if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
                        die("Failed to store link to current notes ref (%s)",
diff --git a/builtin/reset.c b/builtin/reset.c
index f368266..0e8775d 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -244,6 +244,7 @@ static int reset_refs(const char *rev, const unsigned char 
*sha1)
 {
        int update_ref_status;
        struct strbuf msg = STRBUF_INIT;
+       struct strbuf err = STRBUF_INIT;
        unsigned char *orig = NULL, sha1_orig[20],
                *old_orig = NULL, sha1_old_orig[20];
 
@@ -252,13 +253,16 @@ static int reset_refs(const char *rev, const unsigned 
char *sha1)
        if (!get_sha1("HEAD", sha1_orig)) {
                orig = sha1_orig;
                set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
-               update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
-                          UPDATE_REFS_MSG_ON_ERR);
+               if (update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0, &err))
+                       error("%s", err.buf);
+               strbuf_release(&err);
        } else if (old_orig)
                delete_ref("ORIG_HEAD", old_orig, 0);
        set_reflog_message(&msg, "updating HEAD", rev);
-       update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0,
-                                      UPDATE_REFS_MSG_ON_ERR);
+       update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0, &err);
+       if (update_ref_status)
+               error("%s", err.buf);
+       strbuf_release(&err);
        strbuf_release(&msg);
        return update_ref_status;
 }
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index d62871d..062a29c 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -349,6 +349,7 @@ int cmd_update_ref(int argc, const char **argv, const char 
*prefix)
        const char *refname, *oldval;
        unsigned char sha1[20], oldsha1[20];
        int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
+       struct strbuf err = STRBUF_INIT;
        struct option options[] = {
                OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the 
update")),
                OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
@@ -406,6 +407,8 @@ int cmd_update_ref(int argc, const char **argv, const char 
*prefix)
        if (delete)
                return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
        else
-               return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
-                                 flags, UPDATE_REFS_DIE_ON_ERR);
+               if (update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
+                              flags, &err))
+                       die("%s", err.buf);
+       return 0;
 }
diff --git a/notes-cache.c b/notes-cache.c
index 97dfd63..882b56d 100644
--- a/notes-cache.c
+++ b/notes-cache.c
@@ -62,7 +62,7 @@ int notes_cache_write(struct notes_cache *c)
        if (commit_tree(&msg, tree_sha1, NULL, commit_sha1, NULL, NULL) < 0)
                return -1;
        if (update_ref("update notes cache", c->tree.ref, commit_sha1, NULL,
-                      0, UPDATE_REFS_QUIET_ON_ERR) < 0)
+                      0, NULL) < 0)
                return -1;
 
        return 0;
diff --git a/notes-utils.c b/notes-utils.c
index a0b1d7b..805bc31 100644
--- a/notes-utils.c
+++ b/notes-utils.c
@@ -33,6 +33,7 @@ void commit_notes(struct notes_tree *t, const char *msg)
 {
        struct strbuf buf = STRBUF_INIT;
        unsigned char commit_sha1[20];
+       struct strbuf err = STRBUF_INIT;
 
        if (!t)
                t = &default_notes_tree;
@@ -48,8 +49,8 @@ void commit_notes(struct notes_tree *t, const char *msg)
 
        create_notes_commit(t, NULL, &buf, commit_sha1);
        strbuf_insert(&buf, 0, "notes: ", 7); /* commit message starts at index 
7 */
-       update_ref(buf.buf, t->ref, commit_sha1, NULL, 0,
-                  UPDATE_REFS_DIE_ON_ERR);
+       if (update_ref(buf.buf, t->ref, commit_sha1, NULL, 0, &err))
+               die("%s", err.buf);
 
        strbuf_release(&buf);
 }
diff --git a/refs.c b/refs.c
index 46a9595..65eee72 100644
--- a/refs.c
+++ b/refs.c
@@ -3549,7 +3549,7 @@ int transaction_delete_sha1(struct ref_transaction 
*transaction,
 
 int update_ref(const char *action, const char *refname,
               const unsigned char *sha1, const unsigned char *oldval,
-              int flags, enum action_on_err onerr)
+              int flags, struct strbuf *e)
 {
        struct ref_transaction *t;
        struct strbuf err = STRBUF_INIT;
@@ -3562,16 +3562,8 @@ int update_ref(const char *action, const char *refname,
                const char *str = "update_ref failed for ref '%s': %s";
 
                transaction_free(t);
-               switch (onerr) {
-               case UPDATE_REFS_MSG_ON_ERR:
-                       error(str, refname, err.buf);
-                       break;
-               case UPDATE_REFS_DIE_ON_ERR:
-                       die(str, refname, err.buf);
-                       break;
-               case UPDATE_REFS_QUIET_ON_ERR:
-                       break;
-               }
+               if (e)
+                       strbuf_addf(e, str, refname, err.buf);
                strbuf_release(&err);
                return 1;
        }
diff --git a/refs.h b/refs.h
index 54dbe4b..dee9a98 100644
--- a/refs.h
+++ b/refs.h
@@ -202,12 +202,6 @@ extern int rename_ref(const char *oldref, const char 
*newref, const char *logmsg
  */
 extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned 
char *sha1);
 
-enum action_on_err {
-       UPDATE_REFS_MSG_ON_ERR,
-       UPDATE_REFS_DIE_ON_ERR,
-       UPDATE_REFS_QUIET_ON_ERR
-};
-
 /*
  * Begin a reference transaction.  The reference transaction must
  * be freed by calling transaction_free().
@@ -332,8 +326,8 @@ void transaction_free(struct ref_transaction *transaction);
 
 /** Lock a ref and then write its file */
 int update_ref(const char *action, const char *refname,
-               const unsigned char *sha1, const unsigned char *oldval,
-               int flags, enum action_on_err onerr);
+              const unsigned char *sha1, const unsigned char *oldval,
+              int flags, struct strbuf *err);
 
 extern int parse_hide_refs_config(const char *var, const char *value, const 
char *);
 extern int ref_is_hidden(const char *);
diff --git a/transport-helper.c b/transport-helper.c
index 270ae28..d46624a 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -733,6 +733,7 @@ static int push_update_refs_status(struct helper_data *data,
 {
        struct strbuf buf = STRBUF_INIT;
        struct ref *ref = remote_refs;
+       struct strbuf err = STRBUF_INIT;
        int ret = 0;
 
        for (;;) {
@@ -756,7 +757,11 @@ static int push_update_refs_status(struct helper_data 
*data,
                private = apply_refspecs(data->refspecs, data->refspec_nr, 
ref->name);
                if (!private)
                        continue;
-               update_ref("update by helper", private, ref->new_sha1, NULL, 0, 
0);
+               if (update_ref("update by helper", private, ref->new_sha1,
+                              NULL, 0, &err))
+                       error("%s", err.buf);
+               strbuf_release(&err);
+
                free(private);
        }
        strbuf_release(&buf);
diff --git a/transport.c b/transport.c
index f40e950..a3b7f48 100644
--- a/transport.c
+++ b/transport.c
@@ -607,6 +607,7 @@ int transport_refs_pushed(struct ref *ref)
 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int 
verbose)
 {
        struct refspec rs;
+       struct strbuf err = STRBUF_INIT;
 
        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
                return;
@@ -619,9 +620,11 @@ void transport_update_tracking_ref(struct remote *remote, 
struct ref *ref, int v
                        fprintf(stderr, "updating local tracking ref '%s'\n", 
rs.dst);
                if (ref->deletion) {
                        delete_ref(rs.dst, NULL, 0);
-               } else
-                       update_ref("update by push", rs.dst,
-                                       ref->new_sha1, NULL, 0, 0);
+               } else if (update_ref("update by push", rs.dst,
+                                     ref->new_sha1, NULL, 0, &err))
+                       error("%s", err.buf);
+
+               strbuf_release(&err);
                free(rs.dst);
        }
 }
-- 
2.0.1.556.ge8f7cba.dirty

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