Use struct object_id in three fields in struct ref and convert all the
necessary places that use it.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 builtin/clone.c        | 16 +++++++-------
 builtin/fetch-pack.c   |  4 ++--
 builtin/fetch.c        | 50 +++++++++++++++++++++----------------------
 builtin/ls-remote.c    |  2 +-
 builtin/receive-pack.c |  2 +-
 builtin/remote.c       | 12 +++++------
 connect.c              |  2 +-
 fetch-pack.c           | 18 ++++++++--------
 http-push.c            | 46 +++++++++++++++++++--------------------
 http.c                 |  2 +-
 remote-curl.c          | 10 ++++-----
 remote.c               | 58 +++++++++++++++++++++++++-------------------------
 remote.h               |  6 +++---
 send-pack.c            | 16 +++++++-------
 transport-helper.c     | 18 ++++++++--------
 transport.c            | 32 ++++++++++++++--------------
 transport.h            |  8 +++----
 walker.c               |  2 +-
 18 files changed, 152 insertions(+), 152 deletions(-)

diff --git a/builtin/clone.c b/builtin/clone.c
index 00535d0..d164712 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -496,7 +496,7 @@ static void write_remote_refs(const struct ref *local_refs)
        for (r = local_refs; r; r = r->next) {
                if (!r->peer_ref)
                        continue;
-               add_packed_ref(r->peer_ref->name, r->old_sha1);
+               add_packed_ref(r->peer_ref->name, r->old_oid.hash);
        }
 
        if (commit_packed_refs())
@@ -511,9 +511,9 @@ static void write_followtags(const struct ref *refs, const 
char *msg)
                        continue;
                if (ends_with(ref->name, "^{}"))
                        continue;
-               if (!has_sha1_file(ref->old_sha1))
+               if (!has_object_file(&ref->old_oid))
                        continue;
-               update_ref(msg, ref->name, ref->old_sha1,
+               update_ref(msg, ref->name, ref->old_oid.hash,
                           NULL, 0, UPDATE_REFS_DIE_ON_ERR);
        }
 }
@@ -533,7 +533,7 @@ static int iterate_ref_map(void *cb_data, unsigned char 
sha1[20])
        if (!ref)
                return -1;
 
-       hashcpy(sha1, ref->old_sha1);
+       hashcpy(sha1, ref->old_oid.hash);
        *rm = ref->next;
        return 0;
 }
@@ -582,12 +582,12 @@ static void update_head(const struct ref *our, const 
struct ref *remote,
                /* Local default branch link */
                create_symref("HEAD", our->name, NULL);
                if (!option_bare) {
-                       update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
+                       update_ref(msg, "HEAD", our->old_oid.hash, NULL, 0,
                                   UPDATE_REFS_DIE_ON_ERR);
                        install_branch_config(0, head, option_origin, 
our->name);
                }
        } else if (our) {
-               struct commit *c = lookup_commit_reference(our->old_sha1);
+               struct commit *c = lookup_commit_reference(our->old_oid.hash);
                /* --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);
@@ -597,7 +597,7 @@ static void update_head(const struct ref *our, const struct 
ref *remote,
                 * 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,
+               update_ref(msg, "HEAD", remote->old_oid.hash,
                           NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
        }
 }
@@ -948,7 +948,7 @@ int cmd_clone(int argc, const char **argv, const char 
*prefix)
                 * remote HEAD check.
                 */
                for (ref = refs; ref; ref = ref->next)
-                       if (is_null_sha1(ref->old_sha1)) {
+                       if (is_null_oid(&ref->old_oid)) {
                                complete_refs_before_fetch = 0;
                                break;
                        }
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index 4a6b340..19215b3 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -17,7 +17,7 @@ static void add_sought_entry_mem(struct ref ***sought, int 
*nr, int *alloc,
        unsigned char sha1[20];
 
        if (namelen > 41 && name[40] == ' ' && !get_sha1_hex(name, sha1)) {
-               hashcpy(ref->old_sha1, sha1);
+               hashcpy(ref->old_oid.hash, sha1);
                name += 41;
                namelen -= 41;
        }
@@ -210,7 +210,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char 
*prefix)
 
        while (ref) {
                printf("%s %s\n",
-                      sha1_to_hex(ref->old_sha1), ref->name);
+                      oid_to_hex(&ref->old_oid), ref->name);
                ref = ref->next;
        }
 
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 8d5b2db..af42cde 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -195,7 +195,7 @@ static int will_fetch(struct ref **head, const unsigned 
char *sha1)
 {
        struct ref *rm = *head;
        while (rm) {
-               if (!hashcmp(rm->old_sha1, sha1))
+               if (!hashcmp(rm->old_oid.hash, sha1))
                        return 1;
                rm = rm->next;
        }
@@ -223,8 +223,8 @@ static void find_non_local_tags(struct transport *transport,
                 * as one to ignore by setting util to NULL.
                 */
                if (ends_with(ref->name, "^{}")) {
-                       if (item && !has_sha1_file(ref->old_sha1) &&
-                           !will_fetch(head, ref->old_sha1) &&
+                       if (item && !has_object_file(&ref->old_oid) &&
+                           !will_fetch(head, ref->old_oid.hash) &&
                            !has_sha1_file(item->util) &&
                            !will_fetch(head, item->util))
                                item->util = NULL;
@@ -250,7 +250,7 @@ static void find_non_local_tags(struct transport *transport,
                        continue;
 
                item = string_list_insert(&remote_refs, ref->name);
-               item->util = (void *)ref->old_sha1;
+               item->util = (void *)&ref->old_oid;
        }
        string_list_clear(&existing_refs, 1);
 
@@ -272,7 +272,7 @@ static void find_non_local_tags(struct transport *transport,
                {
                        struct ref *rm = alloc_ref(item->string);
                        rm->peer_ref = alloc_ref(item->string);
-                       hashcpy(rm->old_sha1, item->util);
+                       oidcpy(&rm->old_oid, item->util);
                        **tail = rm;
                        *tail = &rm->next;
                }
@@ -418,8 +418,8 @@ static int s_update_ref(const char *action,
        transaction = ref_transaction_begin(&err);
        if (!transaction ||
            ref_transaction_update(transaction, ref->name,
-                                  ref->new_sha1,
-                                  check_old ? ref->old_sha1 : NULL,
+                                  ref->new_oid.hash,
+                                  check_old ? ref->old_oid.hash : NULL,
                                   0, msg, &err))
                goto fail;
 
@@ -452,11 +452,11 @@ static int update_local_ref(struct ref *ref,
        struct branch *current_branch = branch_get(NULL);
        const char *pretty_ref = prettify_refname(ref->name);
 
-       type = sha1_object_info(ref->new_sha1, NULL);
+       type = sha1_object_info(ref->new_oid.hash, NULL);
        if (type < 0)
-               die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
+               die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 
-       if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
+       if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
                if (verbosity > 0)
                        strbuf_addf(display, "= %-*s %-*s -> %s",
                                    TRANSPORT_SUMMARY(_("[up to date]")),
@@ -467,7 +467,7 @@ static int update_local_ref(struct ref *ref,
        if (current_branch &&
            !strcmp(ref->name, current_branch->name) &&
            !(update_head_ok || is_bare_repository()) &&
-           !is_null_sha1(ref->old_sha1)) {
+           !is_null_oid(&ref->old_oid)) {
                /*
                 * If this is the head, and it's not okay to update
                 * the head, and the old value of the head isn't empty...
@@ -479,7 +479,7 @@ static int update_local_ref(struct ref *ref,
                return 1;
        }
 
-       if (!is_null_sha1(ref->old_sha1) &&
+       if (!is_null_oid(&ref->old_oid) &&
            starts_with(ref->name, "refs/tags/")) {
                int r;
                r = s_update_ref("updating tag", ref, 0);
@@ -491,8 +491,8 @@ static int update_local_ref(struct ref *ref,
                return r;
        }
 
-       current = lookup_commit_reference_gently(ref->old_sha1, 1);
-       updated = lookup_commit_reference_gently(ref->new_sha1, 1);
+       current = lookup_commit_reference_gently(ref->old_oid.hash, 1);
+       updated = lookup_commit_reference_gently(ref->new_oid.hash, 1);
        if (!current || !updated) {
                const char *msg;
                const char *what;
@@ -516,7 +516,7 @@ static int update_local_ref(struct ref *ref,
 
                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
                    (recurse_submodules != RECURSE_SUBMODULES_ON))
-                       check_for_new_submodule_commits(ref->new_sha1);
+                       check_for_new_submodule_commits(ref->new_oid.hash);
                r = s_update_ref(msg, ref, 0);
                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
                            r ? '!' : '*',
@@ -531,10 +531,10 @@ static int update_local_ref(struct ref *ref,
                int r;
                strcpy(quickref, find_unique_abbrev(current->object.sha1, 
DEFAULT_ABBREV));
                strcat(quickref, "..");
-               strcat(quickref, find_unique_abbrev(ref->new_sha1, 
DEFAULT_ABBREV));
+               strcat(quickref, find_unique_abbrev(ref->new_oid.hash, 
DEFAULT_ABBREV));
                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
                    (recurse_submodules != RECURSE_SUBMODULES_ON))
-                       check_for_new_submodule_commits(ref->new_sha1);
+                       check_for_new_submodule_commits(ref->new_oid.hash);
                r = s_update_ref("fast-forward", ref, 1);
                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
                            r ? '!' : ' ',
@@ -547,10 +547,10 @@ static int update_local_ref(struct ref *ref,
                int r;
                strcpy(quickref, find_unique_abbrev(current->object.sha1, 
DEFAULT_ABBREV));
                strcat(quickref, "...");
-               strcat(quickref, find_unique_abbrev(ref->new_sha1, 
DEFAULT_ABBREV));
+               strcat(quickref, find_unique_abbrev(ref->new_oid.hash, 
DEFAULT_ABBREV));
                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
                    (recurse_submodules != RECURSE_SUBMODULES_ON))
-                       check_for_new_submodule_commits(ref->new_sha1);
+                       check_for_new_submodule_commits(ref->new_oid.hash);
                r = s_update_ref("forced-update", ref, 1);
                strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
                            r ? '!' : '+',
@@ -577,7 +577,7 @@ static int iterate_ref_map(void *cb_data, unsigned char 
sha1[20])
        if (!ref)
                return -1; /* end of the list */
        *rm = ref->next;
-       hashcpy(sha1, ref->old_sha1);
+       hashcpy(sha1, ref->old_oid.hash);
        return 0;
 }
 
@@ -628,7 +628,7 @@ static int store_updated_refs(const char *raw_url, const 
char *remote_name,
                                continue;
                        }
 
-                       commit = lookup_commit_reference_gently(rm->old_sha1, 
1);
+                       commit = 
lookup_commit_reference_gently(rm->old_oid.hash, 1);
                        if (!commit)
                                rm->fetch_head_status = 
FETCH_HEAD_NOT_FOR_MERGE;
 
@@ -638,8 +638,8 @@ static int store_updated_refs(const char *raw_url, const 
char *remote_name,
                        if (rm->peer_ref) {
                                ref = xcalloc(1, sizeof(*ref) + 
strlen(rm->peer_ref->name) + 1);
                                strcpy(ref->name, rm->peer_ref->name);
-                               hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
-                               hashcpy(ref->new_sha1, rm->old_sha1);
+                               oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
+                               oidcpy(&ref->new_oid, &rm->old_oid);
                                ref->force = rm->peer_ref->force;
                        }
 
@@ -684,7 +684,7 @@ static int store_updated_refs(const char *raw_url, const 
char *remote_name,
                                /* fall-through */
                        case FETCH_HEAD_MERGE:
                                fprintf(fp, "%s\t%s\t%s",
-                                       sha1_to_hex(rm->old_sha1),
+                                       oid_to_hex(&rm->old_oid),
                                        merge_status_marker,
                                        note.buf);
                                for (i = 0; i < url_len; ++i)
@@ -917,7 +917,7 @@ static int do_fetch(struct transport *transport,
                                                   rm->peer_ref->name);
                        if (peer_item) {
                                struct object_id *old_oid = peer_item->util;
-                               hashcpy(rm->peer_ref->old_sha1, old_oid->hash);
+                               oidcpy(&rm->peer_ref->old_oid, old_oid);
                        }
                }
        }
diff --git a/builtin/ls-remote.c b/builtin/ls-remote.c
index 4554dbc..db35e58 100644
--- a/builtin/ls-remote.c
+++ b/builtin/ls-remote.c
@@ -129,7 +129,7 @@ int cmd_ls_remote(int argc, const char **argv, const char 
*prefix)
                        continue;
                if (!tail_match(pattern, ref->name))
                        continue;
-               printf("%s      %s\n", sha1_to_hex(ref->old_sha1), ref->name);
+               printf("%s      %s\n", oid_to_hex(&ref->old_oid), ref->name);
                status = 0; /* we found something */
        }
        return status;
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 94d0571..5941c78 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -222,7 +222,7 @@ static void show_one_alternate_sha1(const unsigned char 
sha1[20], void *unused)
 static void collect_one_alternate_ref(const struct ref *ref, void *data)
 {
        struct sha1_array *sa = data;
-       sha1_array_append(sa, ref->old_sha1);
+       sha1_array_append(sa, ref->old_oid.hash);
 }
 
 static void write_head_info(void)
diff --git a/builtin/remote.c b/builtin/remote.c
index f4a6ec9..fa4d04c 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -395,7 +395,7 @@ static int get_push_ref_states(const struct ref 
*remote_refs,
 
                if (!ref->peer_ref)
                        continue;
-               hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
+               oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
 
                item = string_list_append(&states->push,
                                          abbrev_branch(ref->peer_ref->name));
@@ -404,14 +404,14 @@ static int get_push_ref_states(const struct ref 
*remote_refs,
                info->forced = ref->force;
                info->dest = xstrdup(abbrev_branch(ref->name));
 
-               if (is_null_sha1(ref->new_sha1)) {
+               if (is_null_oid(&ref->new_oid)) {
                        info->status = PUSH_STATUS_DELETE;
-               } else if (!hashcmp(ref->old_sha1, ref->new_sha1))
+               } else if (!oidcmp(&ref->old_oid, &ref->new_oid))
                        info->status = PUSH_STATUS_UPTODATE;
-               else if (is_null_sha1(ref->old_sha1))
+               else if (is_null_oid(&ref->old_oid))
                        info->status = PUSH_STATUS_CREATE;
-               else if (has_sha1_file(ref->old_sha1) &&
-                        ref_newer(ref->new_sha1, ref->old_sha1))
+               else if (has_object_file(&ref->old_oid) &&
+                        ref_newer(ref->new_oid.hash, ref->old_oid.hash))
                        info->status = PUSH_STATUS_FASTFORWARD;
                else
                        info->status = PUSH_STATUS_OUTOFDATE;
diff --git a/connect.c b/connect.c
index c0144d8..f8b10eb 100644
--- a/connect.c
+++ b/connect.c
@@ -165,7 +165,7 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t 
src_len,
                if (!check_ref(name, flags))
                        continue;
                ref = alloc_ref(buffer + 41);
-               hashcpy(ref->old_sha1, old_sha1);
+               hashcpy(ref->old_oid.hash, old_sha1);
                *list = ref;
                list = &ref->next;
                got_at_least_one_head = 1;
diff --git a/fetch-pack.c b/fetch-pack.c
index a912935..c02ea87 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -238,7 +238,7 @@ static void send_request(struct fetch_pack_args *args,
 
 static void insert_one_alternate_ref(const struct ref *ref, void *unused)
 {
-       rev_list_insert_ref(NULL, ref->old_sha1);
+       rev_list_insert_ref(NULL, ref->old_oid.hash);
 }
 
 #define INITIAL_FLUSH 16
@@ -280,7 +280,7 @@ static int find_common(struct fetch_pack_args *args,
 
        fetching = 0;
        for ( ; refs ; refs = refs->next) {
-               unsigned char *remote = refs->old_sha1;
+               unsigned char *remote = refs->old_oid.hash;
                const char *remote_hex;
                struct object *o;
 
@@ -570,7 +570,7 @@ static void filter_refs(struct fetch_pack_args *args,
                                continue;
                        if (get_sha1_hex(ref->name, sha1) ||
                            ref->name[40] != '\0' ||
-                           hashcmp(sha1, ref->old_sha1))
+                           hashcmp(sha1, ref->old_oid.hash))
                                continue;
 
                        ref->matched = 1;
@@ -583,7 +583,7 @@ static void filter_refs(struct fetch_pack_args *args,
 
 static void mark_alternate_complete(const struct ref *ref, void *unused)
 {
-       mark_complete(ref->old_sha1);
+       mark_complete(ref->old_oid.hash);
 }
 
 static int everything_local(struct fetch_pack_args *args,
@@ -599,10 +599,10 @@ static int everything_local(struct fetch_pack_args *args,
        for (ref = *refs; ref; ref = ref->next) {
                struct object *o;
 
-               if (!has_sha1_file(ref->old_sha1))
+               if (!has_object_file(&ref->old_oid))
                        continue;
 
-               o = parse_object(ref->old_sha1);
+               o = parse_object(ref->old_oid.hash);
                if (!o)
                        continue;
 
@@ -630,7 +630,7 @@ static int everything_local(struct fetch_pack_args *args,
         * Don't mark them common yet; the server has to be told so first.
         */
        for (ref = *refs; ref; ref = ref->next) {
-               struct object *o = deref_tag(lookup_object(ref->old_sha1),
+               struct object *o = deref_tag(lookup_object(ref->old_oid.hash),
                                             NULL, 0);
 
                if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
@@ -646,7 +646,7 @@ static int everything_local(struct fetch_pack_args *args,
        filter_refs(args, refs, sought, nr_sought);
 
        for (retval = 1, ref = *refs; ref ; ref = ref->next) {
-               const unsigned char *remote = ref->old_sha1;
+               const unsigned char *remote = ref->old_oid.hash;
                struct object *o;
 
                o = lookup_object(remote);
@@ -987,7 +987,7 @@ static void update_shallow(struct fetch_pack_args *args,
        if (!si->nr_ours && !si->nr_theirs)
                return;
        for (i = 0; i < nr_sought; i++)
-               sha1_array_append(&ref, sought[i]->old_sha1);
+               sha1_array_append(&ref, sought[i]->old_oid.hash);
        si->ref = &ref;
 
        if (args->update_shallow) {
diff --git a/http-push.c b/http-push.c
index c98dad2..d054fdb 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1437,11 +1437,11 @@ static void one_remote_ref(const char *refname)
         * Fetch a copy of the object if it doesn't exist locally - it
         * may be required for updating server info later.
         */
-       if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
-               obj = lookup_unknown_object(ref->old_sha1);
+       if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
+               obj = lookup_unknown_object(ref->old_oid.hash);
                if (obj) {
                        fprintf(stderr, "  fetch %s for %s\n",
-                               sha1_to_hex(ref->old_sha1), refname);
+                               oid_to_hex(&ref->old_oid), refname);
                        add_fetch_request(obj);
                }
        }
@@ -1474,11 +1474,11 @@ static void add_remote_info_ref(struct remote_ls_ctx 
*ls)
                return;
        }
 
-       o = parse_object(ref->old_sha1);
+       o = parse_object(ref->old_oid.hash);
        if (!o) {
                fprintf(stderr,
                        "Unable to parse object %s for remote ref %s\n",
-                       sha1_to_hex(ref->old_sha1), ls->dentry_name);
+                       oid_to_hex(&ref->old_oid), ls->dentry_name);
                aborted = 1;
                free(ref);
                return;
@@ -1487,7 +1487,7 @@ static void add_remote_info_ref(struct remote_ls_ctx *ls)
        len = strlen(ls->dentry_name) + 42;
        ref_info = xcalloc(len + 1, 1);
        sprintf(ref_info, "%s   %s\n",
-               sha1_to_hex(ref->old_sha1), ls->dentry_name);
+               oid_to_hex(&ref->old_oid), ls->dentry_name);
        fwrite_buffer(ref_info, 1, len, buf);
        free(ref_info);
 
@@ -1591,7 +1591,7 @@ static void fetch_symref(const char *path, char **symref, 
unsigned char *sha1)
 static int verify_merge_base(unsigned char *head_sha1, struct ref *remote)
 {
        struct commit *head = lookup_commit_or_die(head_sha1, "HEAD");
-       struct commit *branch = lookup_commit_or_die(remote->old_sha1, 
remote->name);
+       struct commit *branch = lookup_commit_or_die(remote->old_oid.hash, 
remote->name);
 
        return in_merge_bases(branch, head);
 }
@@ -1654,11 +1654,11 @@ static int delete_remote_branch(const char *pattern, 
int force)
                        return error("Remote HEAD resolves to object %s\nwhich 
does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
 
                /* Remote branch must resolve to a known object */
-               if (is_null_sha1(remote_ref->old_sha1))
+               if (is_null_oid(&remote_ref->old_oid))
                        return error("Unable to resolve remote branch %s",
                                     remote_ref->name);
-               if (!has_sha1_file(remote_ref->old_sha1))
-                       return error("Remote branch %s resolves to object 
%s\nwhich does not exist locally, perhaps you need to fetch?", 
remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
+               if (!has_object_file(&remote_ref->old_oid))
+                       return error("Remote branch %s resolves to object 
%s\nwhich does not exist locally, perhaps you need to fetch?", 
remote_ref->name, oid_to_hex(&remote_ref->old_oid));
 
                /* Remote branch must be an ancestor of remote HEAD */
                if (!verify_merge_base(head_sha1, remote_ref)) {
@@ -1874,7 +1874,7 @@ int main(int argc, char **argv)
                if (!ref->peer_ref)
                        continue;
 
-               if (is_null_sha1(ref->peer_ref->new_sha1)) {
+               if (is_null_oid(&ref->peer_ref->new_oid)) {
                        if (delete_remote_branch(ref->name, 1) == -1) {
                                error("Could not remove %s", ref->name);
                                if (helper_status)
@@ -1887,7 +1887,7 @@ int main(int argc, char **argv)
                        continue;
                }
 
-               if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
+               if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
                        if (push_verbosely)
                                fprintf(stderr, "'%s': up-to-date\n", 
ref->name);
                        if (helper_status)
@@ -1896,11 +1896,11 @@ int main(int argc, char **argv)
                }
 
                if (!force_all &&
-                   !is_null_sha1(ref->old_sha1) &&
+                   !is_null_oid(&ref->old_oid) &&
                    !ref->force) {
-                       if (!has_sha1_file(ref->old_sha1) ||
-                           !ref_newer(ref->peer_ref->new_sha1,
-                                      ref->old_sha1)) {
+                       if (!has_object_file(&ref->old_oid) ||
+                           !ref_newer(ref->peer_ref->new_oid.hash,
+                                      ref->old_oid.hash)) {
                                /*
                                 * We do not have the remote ref, or
                                 * we know that the remote ref is not
@@ -1921,10 +1921,10 @@ int main(int argc, char **argv)
                                continue;
                        }
                }
-               hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
+               oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
                new_refs++;
-               strcpy(old_hex, sha1_to_hex(ref->old_sha1));
-               new_hex = sha1_to_hex(ref->new_sha1);
+               strcpy(old_hex, oid_to_hex(&ref->old_oid));
+               new_hex = oid_to_hex(&ref->new_oid);
 
                fprintf(stderr, "updating '%s'", ref->name);
                if (strcmp(ref->name, ref->peer_ref->name))
@@ -1949,14 +1949,14 @@ int main(int argc, char **argv)
 
                /* Set up revision info for this refspec */
                commit_argc = 3;
-               new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
+               new_sha1_hex = xstrdup(oid_to_hex(&ref->new_oid));
                old_sha1_hex = NULL;
                commit_argv[1] = "--objects";
                commit_argv[2] = new_sha1_hex;
-               if (!push_all && !is_null_sha1(ref->old_sha1)) {
+               if (!push_all && !is_null_oid(&ref->old_oid)) {
                        old_sha1_hex = xmalloc(42);
                        sprintf(old_sha1_hex, "^%s",
-                               sha1_to_hex(ref->old_sha1));
+                               oid_to_hex(&ref->old_oid));
                        commit_argv[3] = old_sha1_hex;
                        commit_argc++;
                }
@@ -1988,7 +1988,7 @@ int main(int argc, char **argv)
                run_request_queue();
 
                /* Update the remote branch if all went well */
-               if (aborted || !update_remote(ref->new_sha1, ref_lock))
+               if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
                        rc = 1;
 
                if (!rc)
diff --git a/http.c b/http.c
index f0c5bbc..96b7863 100644
--- a/http.c
+++ b/http.c
@@ -1338,7 +1338,7 @@ int http_fetch_ref(const char *base, struct ref *ref)
        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
                strbuf_rtrim(&buffer);
                if (buffer.len == 40)
-                       ret = get_sha1_hex(buffer.buf, ref->old_sha1);
+                       ret = get_oid_hex(buffer.buf, &ref->old_oid);
                else if (starts_with(buffer.buf, "ref: ")) {
                        ref->symref = xstrdup(buffer.buf + 5);
                        ret = 0;
diff --git a/remote-curl.c b/remote-curl.c
index af7b678..80cb4c7 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -168,7 +168,7 @@ static struct ref *parse_info_refs(struct discovery *heads)
                                      strlen(ref_name) + 1);
                        memset(ref, 0, sizeof(struct ref));
                        strcpy(ref->name, ref_name);
-                       get_sha1_hex(start, ref->old_sha1);
+                       get_oid_hex(start, &ref->old_oid);
                        if (!refs)
                                refs = ref;
                        if (last_ref)
@@ -347,7 +347,7 @@ static void output_refs(struct ref *refs)
                if (posn->symref)
                        printf("@%s %s\n", posn->symref, posn->name);
                else
-                       printf("%s %s\n", sha1_to_hex(posn->old_sha1), 
posn->name);
+                       printf("%s %s\n", oid_to_hex(&posn->old_oid), 
posn->name);
        }
        printf("\n");
        fflush(stdout);
@@ -701,7 +701,7 @@ static int fetch_dumb(int nr_heads, struct ref **to_fetch)
        if (options.depth)
                die("dumb http transport does not support --depth");
        for (i = 0; i < nr_heads; i++)
-               targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
+               targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 
        walker = get_http_walker(url.buf);
        walker->get_all = 1;
@@ -762,7 +762,7 @@ static int fetch_git(struct discovery *heads,
                if (!*ref->name)
                        die("cannot fetch by sha1 over smart http");
                packet_buf_write(&preamble, "%s %s\n",
-                                sha1_to_hex(ref->old_sha1), ref->name);
+                                oid_to_hex(&ref->old_oid), ref->name);
        }
        packet_buf_flush(&preamble);
 
@@ -814,7 +814,7 @@ static void parse_fetch(struct strbuf *buf)
                                die("protocol error: expected sha/ref, got 
%s'", p);
 
                        ref = alloc_ref(name);
-                       hashcpy(ref->old_sha1, old_sha1);
+                       hashcpy(ref->old_oid.hash, old_sha1);
 
                        *list = ref;
                        list = &ref->next;
diff --git a/remote.c b/remote.c
index 26504b7..0574120 100644
--- a/remote.c
+++ b/remote.c
@@ -1111,7 +1111,7 @@ static void tail_link_ref(struct ref *ref, struct ref 
***tail)
 static struct ref *alloc_delete_ref(void)
 {
        struct ref *ref = alloc_ref("(delete)");
-       hashclr(ref->new_sha1);
+       oidclr(&ref->new_oid);
        return ref;
 }
 
@@ -1131,7 +1131,7 @@ static int try_explicit_object_name(const char *name,
 
        if (match) {
                *match = alloc_ref(name);
-               hashcpy((*match)->new_sha1, sha1);
+               hashcpy((*match)->new_oid.hash, sha1);
        }
        return 0;
 }
@@ -1226,7 +1226,7 @@ static int match_explicit(struct ref *src, struct ref 
*dst,
        case 0:
                if (starts_with(dst_value, "refs/"))
                        matched_dst = make_linked_ref(dst_value, dst_tail);
-               else if (is_null_sha1(matched_src->new_sha1))
+               else if (is_null_oid(&matched_src->new_oid))
                        error("unable to delete '%s': remote ref does not 
exist",
                              dst_value);
                else if ((dst_guess = guess_ref(dst_value, matched_src)))
@@ -1357,10 +1357,10 @@ static void add_missing_tags(struct ref *src, struct 
ref **dst, struct ref ***ds
        memset(&sent_tips, 0, sizeof(sent_tips));
        for (ref = *dst; ref; ref = ref->next) {
                if (ref->peer_ref &&
-                   !is_null_sha1(ref->peer_ref->new_sha1))
-                       add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
+                   !is_null_oid(&ref->peer_ref->new_oid))
+                       add_to_tips(&sent_tips, ref->peer_ref->new_oid.hash);
                else
-                       add_to_tips(&sent_tips, ref->old_sha1);
+                       add_to_tips(&sent_tips, ref->old_oid.hash);
                if (starts_with(ref->name, "refs/tags/"))
                        string_list_append(&dst_tag, ref->name);
        }
@@ -1374,7 +1374,7 @@ static void add_missing_tags(struct ref *src, struct ref 
**dst, struct ref ***ds
                        continue; /* not a tag */
                if (string_list_has_string(&dst_tag, ref->name))
                        continue; /* they already have it */
-               if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
+               if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
                        continue; /* be conservative */
                item = string_list_append(&src_tag, ref->name);
                item->util = ref;
@@ -1394,9 +1394,9 @@ static void add_missing_tags(struct ref *src, struct ref 
**dst, struct ref ***ds
                        struct ref *dst_ref;
                        struct commit *commit;
 
-                       if (is_null_sha1(ref->new_sha1))
+                       if (is_null_oid(&ref->new_oid))
                                continue;
-                       commit = lookup_commit_reference_gently(ref->new_sha1, 
1);
+                       commit = 
lookup_commit_reference_gently(ref->new_oid.hash, 1);
                        if (!commit)
                                /* not pushing a commit, which is not an error 
*/
                                continue;
@@ -1410,7 +1410,7 @@ static void add_missing_tags(struct ref *src, struct ref 
**dst, struct ref ***ds
 
                        /* Add it in */
                        dst_ref = make_linked_ref(ref->name, dst_tail);
-                       hashcpy(dst_ref->new_sha1, ref->new_sha1);
+                       oidcpy(&dst_ref->new_oid, &ref->new_oid);
                        dst_ref->peer_ref = copy_ref(ref);
                }
        }
@@ -1517,7 +1517,7 @@ int match_push_refs(struct ref *src, struct ref **dst,
 
                        /* Create a new one and link it */
                        dst_peer = make_linked_ref(dst_name, &dst_tail);
-                       hashcpy(dst_peer->new_sha1, ref->new_sha1);
+                       oidcpy(&dst_peer->new_oid, &ref->new_oid);
                        string_list_insert(&dst_ref_index,
                                dst_peer->name)->util = dst_peer;
                }
@@ -1569,13 +1569,13 @@ void set_ref_status_for_push(struct ref *remote_refs, 
int send_mirror,
                int reject_reason = 0;
 
                if (ref->peer_ref)
-                       hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
+                       oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
                else if (!send_mirror)
                        continue;
 
-               ref->deletion = is_null_sha1(ref->new_sha1);
+               ref->deletion = is_null_oid(&ref->new_oid);
                if (!ref->deletion &&
-                       !hashcmp(ref->old_sha1, ref->new_sha1)) {
+                       !oidcmp(&ref->old_oid, &ref->new_oid)) {
                        ref->status = REF_STATUS_UPTODATE;
                        continue;
                }
@@ -1594,7 +1594,7 @@ void set_ref_status_for_push(struct ref *remote_refs, int 
send_mirror,
                 */
                if (ref->expect_old_sha1) {
                        if (ref->expect_old_no_trackback ||
-                           hashcmp(ref->old_sha1, ref->old_sha1_expect))
+                           oidcmp(&ref->old_oid, &ref->old_oid_expect))
                                reject_reason = REF_STATUS_REJECT_STALE;
                }
 
@@ -1618,15 +1618,15 @@ void set_ref_status_for_push(struct ref *remote_refs, 
int send_mirror,
                 *     passing the --force argument
                 */
 
-               else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
+               else if (!ref->deletion && !is_null_oid(&ref->old_oid)) {
                        if (starts_with(ref->name, "refs/tags/"))
                                reject_reason = 
REF_STATUS_REJECT_ALREADY_EXISTS;
-                       else if (!has_sha1_file(ref->old_sha1))
+                       else if (!has_object_file(&ref->old_oid))
                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
-                       else if (!lookup_commit_reference_gently(ref->old_sha1, 
1) ||
-                                !lookup_commit_reference_gently(ref->new_sha1, 
1))
+                       else if 
(!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
+                                
!lookup_commit_reference_gently(ref->new_oid.hash, 1))
                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
-                       else if (!ref_newer(ref->new_sha1, ref->old_sha1))
+                       else if (!ref_newer(ref->new_oid.hash, 
ref->old_oid.hash))
                                reject_reason = 
REF_STATUS_REJECT_NONFASTFORWARD;
                }
 
@@ -1925,7 +1925,7 @@ int get_fetch_map(const struct ref *remote_refs,
 
                if (refspec->exact_sha1) {
                        ref_map = alloc_ref(name);
-                       get_sha1_hex(name, ref_map->old_sha1);
+                       get_oid_hex(name, &ref_map->old_oid);
                } else {
                        ref_map = get_remote_ref(remote_refs, name);
                }
@@ -1966,7 +1966,7 @@ int resolve_remote_symref(struct ref *ref, struct ref 
*list)
                return 0;
        for (; list; list = list->next)
                if (!strcmp(ref->symref, list->name)) {
-                       hashcpy(ref->old_sha1, list->old_sha1);
+                       oidcpy(&ref->old_oid, &list->old_oid);
                        return 0;
                }
        return 1;
@@ -2181,7 +2181,7 @@ static int one_local_ref(const char *refname, const 
struct object_id *oid,
 
        len = strlen(refname) + 1;
        ref = xcalloc(1, sizeof(*ref) + len);
-       hashcpy(ref->new_sha1, oid->hash);
+       oidcpy(&ref->new_oid, oid);
        memcpy(ref->name, refname, len);
        **local_tail = ref;
        *local_tail = &ref->next;
@@ -2218,7 +2218,7 @@ struct ref *guess_remote_head(const struct ref *head,
        /* If refs/heads/master could be right, it is. */
        if (!all) {
                r = find_ref_by_name(refs, "refs/heads/master");
-               if (r && !hashcmp(r->old_sha1, head->old_sha1))
+               if (r && !oidcmp(&r->old_oid, &head->old_oid))
                        return copy_ref(r);
        }
 
@@ -2226,7 +2226,7 @@ struct ref *guess_remote_head(const struct ref *head,
        for (r = refs; r; r = r->next) {
                if (r != head &&
                    starts_with(r->name, "refs/heads/") &&
-                   !hashcmp(r->old_sha1, head->old_sha1)) {
+                   !oidcmp(&r->old_oid, &head->old_oid)) {
                        *tail = copy_ref(r);
                        tail = &((*tail)->next);
                        if (!all)
@@ -2274,7 +2274,7 @@ static int get_stale_heads_cb(const char *refname, const 
struct object_id *oid,
 
        if (stale) {
                struct ref *ref = make_linked_ref(refname, 
&info->stale_refs_tail);
-               hashcpy(ref->new_sha1, oid->hash);
+               oidcpy(&ref->new_oid, oid);
        }
 
 clean_exit:
@@ -2394,8 +2394,8 @@ static void apply_cas(struct push_cas_option *cas,
                        continue;
                ref->expect_old_sha1 = 1;
                if (!entry->use_tracking)
-                       hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
-               else if (remote_tracking(remote, ref->name, 
ref->old_sha1_expect))
+                       hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
+               else if (remote_tracking(remote, ref->name, 
ref->old_oid_expect.hash))
                        ref->expect_old_no_trackback = 1;
                return;
        }
@@ -2405,7 +2405,7 @@ static void apply_cas(struct push_cas_option *cas,
                return;
 
        ref->expect_old_sha1 = 1;
-       if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
+       if (remote_tracking(remote, ref->name, ref->old_oid_expect.hash))
                ref->expect_old_no_trackback = 1;
 }
 
diff --git a/remote.h b/remote.h
index 312b7ca..163ea5e 100644
--- a/remote.h
+++ b/remote.h
@@ -79,9 +79,9 @@ extern const struct refspec *tag_refspec;
 
 struct ref {
        struct ref *next;
-       unsigned char old_sha1[20];
-       unsigned char new_sha1[20];
-       unsigned char old_sha1_expect[20]; /* used by expect-old */
+       struct object_id old_oid;
+       struct object_id new_oid;
+       struct object_id old_oid_expect; /* used by expect-old */
        char *symref;
        unsigned int
                force:1,
diff --git a/send-pack.c b/send-pack.c
index 2a64fec..ae3a104 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -79,11 +79,11 @@ static int pack_objects(int fd, struct ref *refs, struct 
sha1_array *extra, stru
                        break;
 
        while (refs) {
-               if (!is_null_sha1(refs->old_sha1) &&
-                   !feed_object(refs->old_sha1, po.in, 1))
+               if (!is_null_oid(&refs->old_oid) &&
+                   !feed_object(refs->old_oid.hash, po.in, 1))
                        break;
-               if (!is_null_sha1(refs->new_sha1) &&
-                   !feed_object(refs->new_sha1, po.in, 0))
+               if (!is_null_oid(&refs->new_oid) &&
+                   !feed_object(refs->new_oid.hash, po.in, 0))
                        break;
                refs = refs->next;
        }
@@ -261,8 +261,8 @@ static int generate_push_cert(struct strbuf *req_buf,
                        continue;
                update_seen = 1;
                strbuf_addf(&cert, "%s %s %s\n",
-                           sha1_to_hex(ref->old_sha1),
-                           sha1_to_hex(ref->new_sha1),
+                           oid_to_hex(&ref->old_oid),
+                           oid_to_hex(&ref->new_oid),
                            ref->name);
        }
        if (!update_seen)
@@ -458,8 +458,8 @@ int send_pack(struct send_pack_args *args,
                if (check_to_send_update(ref, args) < 0)
                        continue;
 
-               old_hex = sha1_to_hex(ref->old_sha1);
-               new_hex = sha1_to_hex(ref->new_sha1);
+               old_hex = oid_to_hex(&ref->old_oid);
+               new_hex = oid_to_hex(&ref->new_oid);
                if (!cmds_sent) {
                        packet_buf_write(&req_buf,
                                         "%s %s %s%c%s",
diff --git a/transport-helper.c b/transport-helper.c
index 5d99a6b..4ca3e80 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -347,7 +347,7 @@ static int fetch_with_fetch(struct transport *transport,
                        continue;
 
                strbuf_addf(&buf, "fetch %s %s\n",
-                           sha1_to_hex(posn->old_sha1),
+                           oid_to_hex(&posn->old_oid),
                            posn->symref ? posn->symref : posn->name);
        }
 
@@ -490,7 +490,7 @@ static int fetch_with_import(struct transport *transport,
                else
                        private = xstrdup(name);
                if (private) {
-                       read_ref(private, posn->old_sha1);
+                       read_ref(private, posn->old_oid.hash);
                        free(private);
                }
        }
@@ -756,7 +756,7 @@ 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);
+               update_ref("update by helper", private, ref->new_oid.hash, 
NULL, 0, 0);
                free(private);
        }
        strbuf_release(&buf);
@@ -803,7 +803,7 @@ static int push_refs_with_push(struct transport *transport,
                        if (ref->peer_ref)
                                strbuf_addstr(&buf, ref->peer_ref->name);
                        else
-                               strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
+                               strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
                }
                strbuf_addch(&buf, ':');
                strbuf_addstr(&buf, ref->name);
@@ -812,14 +812,14 @@ static int push_refs_with_push(struct transport 
*transport,
                /*
                 * The "--force-with-lease" options without explicit
                 * values to expect have already been expanded into
-                * the ref->old_sha1_expect[] field; we can ignore
+                * the ref->old_oid_expect[] field; we can ignore
                 * transport->smart_options->cas altogether and instead
                 * can enumerate them from the refs.
                 */
                if (ref->expect_old_sha1) {
                        struct strbuf cas = STRBUF_INIT;
                        strbuf_addf(&cas, "%s:%s",
-                                   ref->name, 
sha1_to_hex(ref->old_sha1_expect));
+                                   ref->name, 
oid_to_hex(&ref->old_oid_expect));
                        string_list_append(&cas_options, strbuf_detach(&cas, 
NULL));
                }
        }
@@ -883,7 +883,7 @@ static int push_refs_with_export(struct transport 
*transport,
                if (private && !get_sha1(private, sha1)) {
                        strbuf_addf(&buf, "^%s", private);
                        string_list_append(&revlist_args, strbuf_detach(&buf, 
NULL));
-                       hashcpy(ref->old_sha1, sha1);
+                       hashcpy(ref->old_oid.hash, sha1);
                }
                free(private);
 
@@ -1015,11 +1015,11 @@ static struct ref *get_refs_list(struct transport 
*transport, int for_push)
                if (buf.buf[0] == '@')
                        (*tail)->symref = xstrdup(buf.buf + 1);
                else if (buf.buf[0] != '?')
-                       get_sha1_hex(buf.buf, (*tail)->old_sha1);
+                       get_oid_hex(buf.buf, &(*tail)->old_oid);
                if (eon) {
                        if (has_attribute(eon + 1, "unchanged")) {
                                (*tail)->status |= REF_STATUS_UPTODATE;
-                               read_ref((*tail)->name, (*tail)->old_sha1);
+                               read_ref((*tail)->name, (*tail)->old_oid.hash);
                        }
                }
                tail = &((*tail)->next);
diff --git a/transport.c b/transport.c
index 40692f8..e880d94 100644
--- a/transport.c
+++ b/transport.c
@@ -79,7 +79,7 @@ static int read_loose_refs(struct strbuf *path, int 
name_offset,
                                continue;
                        next = alloc_ref(path->buf + name_offset);
                        if (read_in_full(fd, buffer, 40) != 40 ||
-                                       get_sha1_hex(buffer, next->old_sha1)) {
+                                       get_oid_hex(buffer, &next->old_oid)) {
                                close(fd);
                                free(next);
                                continue;
@@ -131,7 +131,7 @@ static void insert_packed_refs(const char *packed_refs, 
struct ref **list)
                if (!(*list)->next || cmp < 0) {
                        struct ref *next = alloc_ref(buffer + 41);
                        buffer[40] = '\0';
-                       if (get_sha1_hex(buffer, next->old_sha1)) {
+                       if (get_oid_hex(buffer, &next->old_oid)) {
                                warning ("invalid SHA-1: %s", buffer);
                                free(next);
                                continue;
@@ -162,7 +162,7 @@ static void set_upstreams(struct transport *transport, 
struct ref *refs,
                        continue;
                if (!ref->peer_ref)
                        continue;
-               if (is_null_sha1(ref->new_sha1))
+               if (is_null_oid(&ref->new_oid))
                        continue;
 
                /* Follow symbolic refs (mainly for HEAD). */
@@ -412,7 +412,7 @@ static struct ref *get_refs_from_bundle(struct transport 
*transport, int for_pus
        for (i = 0; i < data->header.references.nr; i++) {
                struct ref_list_entry *e = data->header.references.list + i;
                struct ref *ref = alloc_ref(e->name);
-               hashcpy(ref->old_sha1, e->sha1);
+               hashcpy(ref->old_oid.hash, e->sha1);
                ref->next = result;
                result = ref;
        }
@@ -611,7 +611,7 @@ void transport_update_tracking_ref(struct remote *remote, 
struct ref *ref, int v
                        delete_ref(rs.dst, NULL, 0);
                } else
                        update_ref("update by push", rs.dst,
-                                       ref->new_sha1, NULL, 0, 0);
+                                       ref->new_oid.hash, NULL, 0, 0);
                free(rs.dst);
        }
 }
@@ -651,7 +651,7 @@ static void print_ok_ref_status(struct ref *ref, int 
porcelain)
 {
        if (ref->deletion)
                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
-       else if (is_null_sha1(ref->old_sha1))
+       else if (is_null_oid(&ref->old_oid))
                print_ref_status('*',
                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
                        "[new branch]"),
@@ -661,7 +661,7 @@ static void print_ok_ref_status(struct ref *ref, int 
porcelain)
                char type;
                const char *msg;
 
-               strcpy(quickref, status_abbrev(ref->old_sha1));
+               strcpy(quickref, status_abbrev(ref->old_oid.hash));
                if (ref->forced_update) {
                        strcat(quickref, "...");
                        type = '+';
@@ -671,7 +671,7 @@ static void print_ok_ref_status(struct ref *ref, int 
porcelain)
                        type = ' ';
                        msg = NULL;
                }
-               strcat(quickref, status_abbrev(ref->new_sha1));
+               strcat(quickref, status_abbrev(ref->new_oid.hash));
 
                print_ref_status(type, quickref, ref, ref->peer_ref, msg, 
porcelain);
        }
@@ -1092,8 +1092,8 @@ static int run_pre_push_hook(struct transport *transport,
 
                strbuf_reset(&buf);
                strbuf_addf( &buf, "%s %s %s %s\n",
-                        r->peer_ref->name, sha1_to_hex(r->new_sha1),
-                        r->name, sha1_to_hex(r->old_sha1));
+                        r->peer_ref->name, oid_to_hex(&r->new_oid),
+                        r->name, oid_to_hex(&r->old_oid));
 
                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
                        ret = -1;
@@ -1173,8 +1173,8 @@ int transport_push(struct transport *transport,
                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && 
!is_bare_repository()) {
                        struct ref *ref = remote_refs;
                        for (; ref; ref = ref->next)
-                               if (!is_null_sha1(ref->new_sha1) &&
-                                   !push_unpushed_submodules(ref->new_sha1,
+                               if (!is_null_oid(&ref->new_oid) &&
+                                   !push_unpushed_submodules(ref->new_oid.hash,
                                            transport->remote->name))
                                    die ("Failed to push all needed 
submodules!");
                }
@@ -1185,8 +1185,8 @@ int transport_push(struct transport *transport,
                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 
                        for (; ref; ref = ref->next)
-                               if (!is_null_sha1(ref->new_sha1) &&
-                                   find_unpushed_submodules(ref->new_sha1,
+                               if (!is_null_oid(&ref->new_oid) &&
+                                   find_unpushed_submodules(ref->new_oid.hash,
                                            transport->remote->name, 
&needs_pushing))
                                        
die_with_unpushed_submodules(&needs_pushing);
                }
@@ -1239,8 +1239,8 @@ int transport_fetch_refs(struct transport *transport, 
struct ref *refs)
        for (rm = refs; rm; rm = rm->next) {
                nr_refs++;
                if (rm->peer_ref &&
-                   !is_null_sha1(rm->old_sha1) &&
-                   !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
+                   !is_null_oid(&rm->old_oid) &&
+                   !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
                        continue;
                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
                heads[nr_heads++] = rm;
diff --git a/transport.h b/transport.h
index 18d2cf8..4a4aaac 100644
--- a/transport.h
+++ b/transport.h
@@ -75,15 +75,15 @@ struct transport {
        /**
         * Push the objects and refs. Send the necessary objects, and
         * then, for any refs where peer_ref is set and
-        * peer_ref->new_sha1 is different from old_sha1, tell the
-        * remote side to update each ref in the list from old_sha1 to
-        * peer_ref->new_sha1.
+        * peer_ref->new_oid is different from old_oid, tell the
+        * remote side to update each ref in the list from old_oid to
+        * peer_ref->new_oid.
         *
         * Where possible, set the status for each ref appropriately.
         *
         * The transport must modify new_sha1 in the ref to the new
         * value if the remote accepted the change. Note that this
-        * could be a different value from peer_ref->new_sha1 if the
+        * could be a different value from peer_ref->new_oid if the
         * process involved generating new commits.
         **/
        int (*push_refs)(struct transport *transport, struct ref *refs, int 
flags);
diff --git a/walker.c b/walker.c
index 44a936c..14f71c0 100644
--- a/walker.c
+++ b/walker.c
@@ -191,7 +191,7 @@ static int interpret_target(struct walker *walker, char 
*target, unsigned char *
        if (!check_refname_format(target, 0)) {
                struct ref *ref = alloc_ref(target);
                if (!walker->fetch_ref(walker, ref)) {
-                       hashcpy(sha1, ref->old_sha1);
+                       hashcpy(sha1, ref->old_oid.hash);
                        free(ref);
                        return 0;
                }
-- 
2.4.0

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