Code

disconnect from remote helpers more gently
[git.git] / transport.c
index 71433d99978ddcc53c80fd6de4aee98871c6d8cf..c9c8056f9de69bd378cd271d70363b5560f13e07 100644 (file)
@@ -1,9 +1,6 @@
 #include "cache.h"
 #include "transport.h"
 #include "run-command.h"
-#ifndef NO_CURL
-#include "http.h"
-#endif
 #include "pkt-line.h"
 #include "fetch-pack.h"
 #include "send-pack.h"
@@ -11,6 +8,8 @@
 #include "bundle.h"
 #include "dir.h"
 #include "refs.h"
+#include "branch.h"
+#include "url.h"
 
 /* rsync support */
 
@@ -50,9 +49,7 @@ static int read_loose_refs(struct strbuf *path, int name_offset,
        memset (&list, 0, sizeof(list));
 
        while ((de = readdir(dir))) {
-               if (de->d_name[0] == '.' && (de->d_name[1] == '\0' ||
-                               (de->d_name[1] == '.' &&
-                                de->d_name[2] == '\0')))
+               if (is_dot_or_dotdot(de->d_name))
                        continue;
                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
                list.entries[list.nr++] = xstrdup(de->d_name);
@@ -75,7 +72,7 @@ static int read_loose_refs(struct strbuf *path, int name_offset,
 
                        if (fd < 0)
                                continue;
-                       next = alloc_ref(path->len - name_offset + 1);
+                       next = alloc_ref(path->buf + name_offset);
                        if (read_in_full(fd, buffer, 40) != 40 ||
                                        get_sha1_hex(buffer, next->old_sha1)) {
                                close(fd);
@@ -83,7 +80,6 @@ static int read_loose_refs(struct strbuf *path, int name_offset,
                                continue;
                        }
                        close(fd);
-                       strcpy(next->name, path->buf + name_offset);
                        (*tail)->next = next;
                        *tail = next;
                }
@@ -127,14 +123,13 @@ static void insert_packed_refs(const char *packed_refs, struct ref **list)
                                      (*list)->next->name)) > 0)
                        list = &(*list)->next;
                if (!(*list)->next || cmp < 0) {
-                       struct ref *next = alloc_ref(len - 40);
+                       struct ref *next = alloc_ref(buffer + 41);
                        buffer[40] = '\0';
                        if (get_sha1_hex(buffer, next->old_sha1)) {
                                warning ("invalid SHA-1: %s", buffer);
                                free(next);
                                continue;
                        }
-                       strcpy(next->name, buffer + 41);
                        next->next = (*list)->next;
                        (*list)->next = next;
                        list = &(*list)->next;
@@ -142,22 +137,77 @@ static void insert_packed_refs(const char *packed_refs, struct ref **list)
        }
 }
 
-static struct ref *get_refs_via_rsync(struct transport *transport)
+static void set_upstreams(struct transport *transport, struct ref *refs,
+       int pretend)
+{
+       struct ref *ref;
+       for (ref = refs; ref; ref = ref->next) {
+               const char *localname;
+               const char *tmp;
+               const char *remotename;
+               unsigned char sha[20];
+               int flag = 0;
+               /*
+                * Check suitability for tracking. Must be successful /
+                * already up-to-date ref create/modify (not delete).
+                */
+               if (ref->status != REF_STATUS_OK &&
+                       ref->status != REF_STATUS_UPTODATE)
+                       continue;
+               if (!ref->peer_ref)
+                       continue;
+               if (is_null_sha1(ref->new_sha1))
+                       continue;
+
+               /* Follow symbolic refs (mainly for HEAD). */
+               localname = ref->peer_ref->name;
+               remotename = ref->name;
+               tmp = resolve_ref(localname, sha, 1, &flag);
+               if (tmp && flag & REF_ISSYMREF &&
+                       !prefixcmp(tmp, "refs/heads/"))
+                       localname = tmp;
+
+               /* Both source and destination must be local branches. */
+               if (!localname || prefixcmp(localname, "refs/heads/"))
+                       continue;
+               if (!remotename || prefixcmp(remotename, "refs/heads/"))
+                       continue;
+
+               if (!pretend)
+                       install_branch_config(BRANCH_CONFIG_VERBOSE,
+                               localname + 11, transport->remote->name,
+                               remotename);
+               else
+                       printf("Would set upstream of '%s' to '%s' of '%s'\n",
+                               localname + 11, remotename + 11,
+                               transport->remote->name);
+       }
+}
+
+static const char *rsync_url(const char *url)
+{
+       return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
+}
+
+static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 {
        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
-       struct ref dummy, *tail = &dummy;
+       struct ref dummy = {NULL}, *tail = &dummy;
        struct child_process rsync;
        const char *args[5];
        int temp_dir_len;
 
+       if (for_push)
+               return NULL;
+
        /* copy the refs to the temporary directory */
 
        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
        if (!mkdtemp(temp_dir.buf))
-               die ("Could not make temporary directory");
+               die_errno ("Could not make temporary directory");
        temp_dir_len = temp_dir.len;
 
-       strbuf_addstr(&buf, transport->url);
+       strbuf_addstr(&buf, rsync_url(transport->url));
        strbuf_addstr(&buf, "/refs");
 
        memset(&rsync, 0, sizeof(rsync));
@@ -173,7 +223,7 @@ static struct ref *get_refs_via_rsync(struct transport *transport)
                die ("Could not run rsync to get refs");
 
        strbuf_reset(&buf);
-       strbuf_addstr(&buf, transport->url);
+       strbuf_addstr(&buf, rsync_url(transport->url));
        strbuf_addstr(&buf, "/packed-refs");
 
        args[2] = buf.buf;
@@ -203,14 +253,14 @@ static struct ref *get_refs_via_rsync(struct transport *transport)
 }
 
 static int fetch_objs_via_rsync(struct transport *transport,
-                               int nr_objs, const struct ref **to_fetch)
+                               int nr_objs, struct ref **to_fetch)
 {
        struct strbuf buf = STRBUF_INIT;
        struct child_process rsync;
        const char *args[8];
        int result;
 
-       strbuf_addstr(&buf, transport->url);
+       strbuf_addstr(&buf, rsync_url(transport->url));
        strbuf_addstr(&buf, "/objects/");
 
        memset(&rsync, 0, sizeof(rsync));
@@ -289,7 +339,7 @@ static int rsync_transport_push(struct transport *transport,
 
        /* first push the objects */
 
-       strbuf_addstr(&buf, transport->url);
+       strbuf_addstr(&buf, rsync_url(transport->url));
        strbuf_addch(&buf, '/');
 
        memset(&rsync, 0, sizeof(rsync));
@@ -310,13 +360,14 @@ static int rsync_transport_push(struct transport *transport,
        args[i++] = NULL;
 
        if (run_command(&rsync))
-               return error("Could not push objects to %s", transport->url);
+               return error("Could not push objects to %s",
+                               rsync_url(transport->url));
 
        /* copy the refs to the temporary directory; they could be packed. */
 
        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
        if (!mkdtemp(temp_dir.buf))
-               die ("Could not make temporary directory");
+               die_errno ("Could not make temporary directory");
        strbuf_addch(&temp_dir, '/');
 
        if (flags & TRANSPORT_PUSH_ALL) {
@@ -331,10 +382,11 @@ static int rsync_transport_push(struct transport *transport,
        if (!(flags & TRANSPORT_PUSH_FORCE))
                args[i++] = "--ignore-existing";
        args[i++] = temp_dir.buf;
-       args[i++] = transport->url;
+       args[i++] = rsync_url(transport->url);
        args[i++] = NULL;
        if (run_command(&rsync))
-               result = error("Could not push to %s", transport->url);
+               result = error("Could not push to %s",
+                               rsync_url(transport->url));
 
        if (remove_dir_recursively(&temp_dir, 0))
                warning ("Could not remove temporary directory %s.",
@@ -346,195 +398,20 @@ static int rsync_transport_push(struct transport *transport,
        return result;
 }
 
-/* Generic functions for using commit walkers */
-
-#ifndef NO_CURL /* http fetch is the only user */
-static int fetch_objs_via_walker(struct transport *transport,
-                                int nr_objs, const struct ref **to_fetch)
-{
-       char *dest = xstrdup(transport->url);
-       struct walker *walker = transport->data;
-       char **objs = xmalloc(nr_objs * sizeof(*objs));
-       int i;
-
-       walker->get_all = 1;
-       walker->get_tree = 1;
-       walker->get_history = 1;
-       walker->get_verbosely = transport->verbose >= 0;
-       walker->get_recover = 0;
-
-       for (i = 0; i < nr_objs; i++)
-               objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
-
-       if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
-               die("Fetch failed.");
-
-       for (i = 0; i < nr_objs; i++)
-               free(objs[i]);
-       free(objs);
-       free(dest);
-       return 0;
-}
-#endif /* NO_CURL */
-
-static int disconnect_walker(struct transport *transport)
-{
-       struct walker *walker = transport->data;
-       if (walker)
-               walker_free(walker);
-       return 0;
-}
-
-#ifndef NO_CURL
-static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
-{
-       const char **argv;
-       int argc;
-       int err;
-
-       if (flags & TRANSPORT_PUSH_MIRROR)
-               return error("http transport does not support mirror mode");
-
-       argv = xmalloc((refspec_nr + 12) * sizeof(char *));
-       argv[0] = "http-push";
-       argc = 1;
-       if (flags & TRANSPORT_PUSH_ALL)
-               argv[argc++] = "--all";
-       if (flags & TRANSPORT_PUSH_FORCE)
-               argv[argc++] = "--force";
-       if (flags & TRANSPORT_PUSH_DRY_RUN)
-               argv[argc++] = "--dry-run";
-       if (flags & TRANSPORT_PUSH_VERBOSE)
-               argv[argc++] = "--verbose";
-       argv[argc++] = transport->url;
-       while (refspec_nr--)
-               argv[argc++] = *refspec++;
-       argv[argc] = NULL;
-       err = run_command_v_opt(argv, RUN_GIT_CMD);
-       switch (err) {
-       case -ERR_RUN_COMMAND_FORK:
-               error("unable to fork for %s", argv[0]);
-       case -ERR_RUN_COMMAND_EXEC:
-               error("unable to exec %s", argv[0]);
-               break;
-       case -ERR_RUN_COMMAND_WAITPID:
-       case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
-       case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
-       case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
-               error("%s died with strange error", argv[0]);
-       }
-       return !!err;
-}
-
-static struct ref *get_refs_via_curl(struct transport *transport)
-{
-       struct strbuf buffer = STRBUF_INIT;
-       char *data, *start, *mid;
-       char *ref_name;
-       char *refs_url;
-       int i = 0;
-
-       struct active_request_slot *slot;
-       struct slot_results results;
-
-       struct ref *refs = NULL;
-       struct ref *ref = NULL;
-       struct ref *last_ref = NULL;
-
-       struct walker *walker;
-
-       if (!transport->data)
-               transport->data = get_http_walker(transport->url,
-                                               transport->remote);
-
-       walker = transport->data;
-
-       refs_url = xmalloc(strlen(transport->url) + 11);
-       sprintf(refs_url, "%s/info/refs", transport->url);
-
-       slot = get_active_slot();
-       slot->results = &results;
-       curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
-       curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
-       curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
-       curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
-
-       if (start_active_slot(slot)) {
-               run_active_slot(slot);
-               if (results.curl_result != CURLE_OK) {
-                       strbuf_release(&buffer);
-                       if (missing_target(&results))
-                               die("%s not found: did you run git update-server-info on the server?", refs_url);
-                       else
-                               die("%s download error - %s", refs_url, curl_errorstr);
-               }
-       } else {
-               strbuf_release(&buffer);
-               die("Unable to start HTTP request");
-       }
-
-       data = buffer.buf;
-       start = NULL;
-       mid = data;
-       while (i < buffer.len) {
-               if (!start)
-                       start = &data[i];
-               if (data[i] == '\t')
-                       mid = &data[i];
-               if (data[i] == '\n') {
-                       data[i] = 0;
-                       ref_name = mid + 1;
-                       ref = xmalloc(sizeof(struct ref) +
-                                     strlen(ref_name) + 1);
-                       memset(ref, 0, sizeof(struct ref));
-                       strcpy(ref->name, ref_name);
-                       get_sha1_hex(start, ref->old_sha1);
-                       if (!refs)
-                               refs = ref;
-                       if (last_ref)
-                               last_ref->next = ref;
-                       last_ref = ref;
-                       start = NULL;
-               }
-               i++;
-       }
-
-       strbuf_release(&buffer);
-
-       ref = alloc_ref_from_str("HEAD");
-       if (!walker->fetch_ref(walker, ref) &&
-           !resolve_remote_symref(ref, refs)) {
-               ref->next = refs;
-               refs = ref;
-       } else {
-               free(ref);
-       }
-
-       return refs;
-}
-
-static int fetch_objs_via_curl(struct transport *transport,
-                                int nr_objs, const struct ref **to_fetch)
-{
-       if (!transport->data)
-               transport->data = get_http_walker(transport->url,
-                                               transport->remote);
-       return fetch_objs_via_walker(transport, nr_objs, to_fetch);
-}
-
-#endif
-
 struct bundle_transport_data {
        int fd;
        struct bundle_header header;
 };
 
-static struct ref *get_refs_from_bundle(struct transport *transport)
+static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 {
        struct bundle_transport_data *data = transport->data;
        struct ref *result = NULL;
        int i;
 
+       if (for_push)
+               return NULL;
+
        if (data->fd > 0)
                close(data->fd);
        data->fd = read_bundle_header(transport->url, &data->header);
@@ -542,7 +419,7 @@ static struct ref *get_refs_from_bundle(struct transport *transport)
                die ("Could not read bundle '%s'.", transport->url);
        for (i = 0; i < data->header.references.nr; i++) {
                struct ref_list_entry *e = data->header.references.list + i;
-               struct ref *ref = alloc_ref_from_str(e->name);
+               struct ref *ref = alloc_ref(e->name);
                hashcpy(ref->old_sha1, e->sha1);
                ref->next = result;
                result = ref;
@@ -551,7 +428,7 @@ static struct ref *get_refs_from_bundle(struct transport *transport)
 }
 
 static int fetch_refs_from_bundle(struct transport *transport,
-                              int nr_heads, const struct ref **to_fetch)
+                              int nr_heads, struct ref **to_fetch)
 {
        struct bundle_transport_data *data = transport->data;
        return unbundle(&data->header, data->fd);
@@ -567,65 +444,71 @@ static int close_bundle(struct transport *transport)
 }
 
 struct git_transport_data {
-       unsigned thin : 1;
-       unsigned keep : 1;
-       unsigned followtags : 1;
-       int depth;
+       struct git_transport_options options;
        struct child_process *conn;
        int fd[2];
-       const char *uploadpack;
-       const char *receivepack;
+       unsigned got_remote_heads : 1;
+       struct extra_have_objects extra_have;
 };
 
-static int set_git_option(struct transport *connection,
+static int set_git_option(struct git_transport_options *opts,
                          const char *name, const char *value)
 {
-       struct git_transport_data *data = connection->data;
        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
-               data->uploadpack = value;
+               opts->uploadpack = value;
                return 0;
        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
-               data->receivepack = value;
+               opts->receivepack = value;
                return 0;
        } else if (!strcmp(name, TRANS_OPT_THIN)) {
-               data->thin = !!value;
+               opts->thin = !!value;
                return 0;
        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
-               data->followtags = !!value;
+               opts->followtags = !!value;
                return 0;
        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
-               data->keep = !!value;
+               opts->keep = !!value;
                return 0;
        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
                if (!value)
-                       data->depth = 0;
+                       opts->depth = 0;
                else
-                       data->depth = atoi(value);
+                       opts->depth = atoi(value);
                return 0;
        }
        return 1;
 }
 
-static int connect_setup(struct transport *transport)
+static int connect_setup(struct transport *transport, int for_push, int verbose)
 {
        struct git_transport_data *data = transport->data;
-       data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
+
+       if (data->conn)
+               return 0;
+
+       data->conn = git_connect(data->fd, transport->url,
+                                for_push ? data->options.receivepack :
+                                data->options.uploadpack,
+                                verbose ? CONNECT_VERBOSE : 0);
+
        return 0;
 }
 
-static struct ref *get_refs_via_connect(struct transport *transport)
+static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 {
        struct git_transport_data *data = transport->data;
        struct ref *refs;
 
-       connect_setup(transport);
-       get_remote_heads(data->fd[0], &refs, 0, NULL, 0);
+       connect_setup(transport, for_push, 0);
+       get_remote_heads(data->fd[0], &refs, 0, NULL,
+                        for_push ? REF_NORMAL : 0, &data->extra_have);
+       data->got_remote_heads = 1;
 
        return refs;
 }
 
 static int fetch_refs_via_pack(struct transport *transport,
-                              int nr_heads, const struct ref **to_fetch)
+                              int nr_heads, struct ref **to_fetch)
 {
        struct git_transport_data *data = transport->data;
        char **heads = xmalloc(nr_heads * sizeof(*heads));
@@ -637,22 +520,23 @@ static int fetch_refs_via_pack(struct transport *transport,
        struct ref *refs_tmp = NULL;
 
        memset(&args, 0, sizeof(args));
-       args.uploadpack = data->uploadpack;
-       args.keep_pack = data->keep;
+       args.uploadpack = data->options.uploadpack;
+       args.keep_pack = data->options.keep;
        args.lock_pack = 1;
-       args.use_thin_pack = data->thin;
-       args.include_tag = data->followtags;
+       args.use_thin_pack = data->options.thin;
+       args.include_tag = data->options.followtags;
        args.verbose = (transport->verbose > 0);
-       args.quiet = args.no_progress = (transport->verbose < 0);
-       args.no_progress = !isatty(1);
-       args.depth = data->depth;
+       args.quiet = (transport->verbose < 0);
+       args.no_progress = !transport->progress;
+       args.depth = data->options.depth;
 
        for (i = 0; i < nr_heads; i++)
                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 
-       if (!data->conn) {
-               connect_setup(transport);
-               get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0);
+       if (!data->got_remote_heads) {
+               connect_setup(transport, 0, 0);
+               get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
+               data->got_remote_heads = 1;
        }
 
        refs = fetch_pack(&args, data->fd, data->conn,
@@ -663,6 +547,7 @@ static int fetch_refs_via_pack(struct transport *transport,
        if (finish_connect(data->conn))
                refs = NULL;
        data->conn = NULL;
+       data->got_remote_heads = 0;
 
        free_refs(refs_tmp);
 
@@ -674,27 +559,269 @@ static int fetch_refs_via_pack(struct transport *transport,
        return (refs ? 0 : -1);
 }
 
-static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
+static int push_had_errors(struct ref *ref)
+{
+       for (; ref; ref = ref->next) {
+               switch (ref->status) {
+               case REF_STATUS_NONE:
+               case REF_STATUS_UPTODATE:
+               case REF_STATUS_OK:
+                       break;
+               default:
+                       return 1;
+               }
+       }
+       return 0;
+}
+
+int transport_refs_pushed(struct ref *ref)
+{
+       for (; ref; ref = ref->next) {
+               switch(ref->status) {
+               case REF_STATUS_NONE:
+               case REF_STATUS_UPTODATE:
+                       break;
+               default:
+                       return 1;
+               }
+       }
+       return 0;
+}
+
+void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
+{
+       struct refspec rs;
+
+       if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
+               return;
+
+       rs.src = ref->name;
+       rs.dst = NULL;
+
+       if (!remote_find_tracking(remote, &rs)) {
+               if (verbose)
+                       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);
+               free(rs.dst);
+       }
+}
+
+static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
+{
+       if (porcelain) {
+               if (from)
+                       fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
+               else
+                       fprintf(stdout, "%c\t:%s\t", flag, to->name);
+               if (msg)
+                       fprintf(stdout, "%s (%s)\n", summary, msg);
+               else
+                       fprintf(stdout, "%s\n", summary);
+       } else {
+               fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
+               if (from)
+                       fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
+               else
+                       fputs(prettify_refname(to->name), stderr);
+               if (msg) {
+                       fputs(" (", stderr);
+                       fputs(msg, stderr);
+                       fputc(')', stderr);
+               }
+               fputc('\n', stderr);
+       }
+}
+
+static const char *status_abbrev(unsigned char sha1[20])
+{
+       return find_unique_abbrev(sha1, DEFAULT_ABBREV);
+}
+
+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))
+               print_ref_status('*',
+                       (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
+                       "[new branch]"),
+                       ref, ref->peer_ref, NULL, porcelain);
+       else {
+               char quickref[84];
+               char type;
+               const char *msg;
+
+               strcpy(quickref, status_abbrev(ref->old_sha1));
+               if (ref->nonfastforward) {
+                       strcat(quickref, "...");
+                       type = '+';
+                       msg = "forced update";
+               } else {
+                       strcat(quickref, "..");
+                       type = ' ';
+                       msg = NULL;
+               }
+               strcat(quickref, status_abbrev(ref->new_sha1));
+
+               print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
+       }
+}
+
+static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
+{
+       if (!count)
+               fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
+
+       switch(ref->status) {
+       case REF_STATUS_NONE:
+               print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
+               break;
+       case REF_STATUS_REJECT_NODELETE:
+               print_ref_status('!', "[rejected]", ref, NULL,
+                                                "remote does not support deleting refs", porcelain);
+               break;
+       case REF_STATUS_UPTODATE:
+               print_ref_status('=', "[up to date]", ref,
+                                                ref->peer_ref, NULL, porcelain);
+               break;
+       case REF_STATUS_REJECT_NONFASTFORWARD:
+               print_ref_status('!', "[rejected]", ref, ref->peer_ref,
+                                                "non-fast-forward", porcelain);
+               break;
+       case REF_STATUS_REMOTE_REJECT:
+               print_ref_status('!', "[remote rejected]", ref,
+                                                ref->deletion ? NULL : ref->peer_ref,
+                                                ref->remote_status, porcelain);
+               break;
+       case REF_STATUS_EXPECTING_REPORT:
+               print_ref_status('!', "[remote failure]", ref,
+                                                ref->deletion ? NULL : ref->peer_ref,
+                                                "remote failed to report status", porcelain);
+               break;
+       case REF_STATUS_OK:
+               print_ok_ref_status(ref, porcelain);
+               break;
+       }
+
+       return 1;
+}
+
+void transport_print_push_status(const char *dest, struct ref *refs,
+                                 int verbose, int porcelain, int *nonfastforward)
+{
+       struct ref *ref;
+       int n = 0;
+
+       if (verbose) {
+               for (ref = refs; ref; ref = ref->next)
+                       if (ref->status == REF_STATUS_UPTODATE)
+                               n += print_one_push_status(ref, dest, n, porcelain);
+       }
+
+       for (ref = refs; ref; ref = ref->next)
+               if (ref->status == REF_STATUS_OK)
+                       n += print_one_push_status(ref, dest, n, porcelain);
+
+       *nonfastforward = 0;
+       for (ref = refs; ref; ref = ref->next) {
+               if (ref->status != REF_STATUS_NONE &&
+                   ref->status != REF_STATUS_UPTODATE &&
+                   ref->status != REF_STATUS_OK)
+                       n += print_one_push_status(ref, dest, n, porcelain);
+               if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
+                       *nonfastforward = 1;
+       }
+}
+
+void transport_verify_remote_names(int nr_heads, const char **heads)
+{
+       int i;
+
+       for (i = 0; i < nr_heads; i++) {
+               const char *local = heads[i];
+               const char *remote = strrchr(heads[i], ':');
+
+               if (*local == '+')
+                       local++;
+
+               /* A matching refspec is okay.  */
+               if (remote == local && remote[1] == '\0')
+                       continue;
+
+               remote = remote ? (remote + 1) : local;
+               switch (check_ref_format(remote)) {
+               case 0: /* ok */
+               case CHECK_REF_FORMAT_ONELEVEL:
+                       /* ok but a single level -- that is fine for
+                        * a match pattern.
+                        */
+               case CHECK_REF_FORMAT_WILDCARD:
+                       /* ok but ends with a pattern-match character */
+                       continue;
+               }
+               die("remote part of refspec is not a valid name in %s",
+                   heads[i]);
+       }
+}
+
+static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 {
        struct git_transport_data *data = transport->data;
        struct send_pack_args args;
+       int ret;
+
+       if (!data->got_remote_heads) {
+               struct ref *tmp_refs;
+               connect_setup(transport, 1, 0);
+
+               get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
+                                NULL);
+               data->got_remote_heads = 1;
+       }
 
-       args.receivepack = data->receivepack;
-       args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
+       memset(&args, 0, sizeof(args));
        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
-       args.use_thin_pack = data->thin;
-       args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
+       args.use_thin_pack = data->options.thin;
+       args.verbose = (transport->verbose > 0);
+       args.quiet = (transport->verbose < 0);
+       args.progress = transport->progress;
        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
+       args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
+
+       ret = send_pack(&args, data->fd, data->conn, remote_refs,
+                       &data->extra_have);
+
+       close(data->fd[1]);
+       close(data->fd[0]);
+       ret |= finish_connect(data->conn);
+       data->conn = NULL;
+       data->got_remote_heads = 0;
+
+       return ret;
+}
 
-       return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
+static int connect_git(struct transport *transport, const char *name,
+                      const char *executable, int fd[2])
+{
+       struct git_transport_data *data = transport->data;
+       data->conn = git_connect(data->fd, transport->url,
+                                executable, 0);
+       fd[0] = data->fd[0];
+       fd[1] = data->fd[1];
+       return 0;
 }
 
 static int disconnect_git(struct transport *transport)
 {
        struct git_transport_data *data = transport->data;
        if (data->conn) {
-               packet_flush(data->fd[1]);
+               if (data->got_remote_heads)
+                       packet_flush(data->fd[1]);
                close(data->fd[0]);
                close(data->fd[1]);
                finish_connect(data->conn);
@@ -704,6 +831,32 @@ static int disconnect_git(struct transport *transport)
        return 0;
 }
 
+void transport_take_over(struct transport *transport,
+                        struct child_process *child)
+{
+       struct git_transport_data *data;
+
+       if (!transport->smart_options)
+               die("Bug detected: Taking over transport requires non-NULL "
+                   "smart_options field.");
+
+       data = xcalloc(1, sizeof(*data));
+       data->options = *transport->smart_options;
+       data->conn = child;
+       data->fd[0] = data->conn->out;
+       data->fd[1] = data->conn->in;
+       data->got_remote_heads = 0;
+       transport->data = data;
+
+       transport->set_option = NULL;
+       transport->get_refs_list = get_refs_via_connect;
+       transport->fetch = fetch_refs_via_pack;
+       transport->push = NULL;
+       transport->push_refs = git_transport_push;
+       transport->disconnect = disconnect_git;
+       transport->smart_options = &(data->options);
+}
+
 static int is_local(const char *url)
 {
        const char *colon = strchr(url, ':');
@@ -720,54 +873,89 @@ static int is_file(const char *url)
        return S_ISREG(buf.st_mode);
 }
 
+static int external_specification_len(const char *url)
+{
+       return strchr(url, ':') - url;
+}
+
 struct transport *transport_get(struct remote *remote, const char *url)
 {
+       const char *helper;
        struct transport *ret = xcalloc(1, sizeof(*ret));
 
+       ret->progress = isatty(2);
+
+       if (!remote)
+               die("No remote provided to transport_get()");
+
+       ret->got_remote_refs = 0;
        ret->remote = remote;
+       helper = remote->foreign_vcs;
+
+       if (!url && remote->url)
+               url = remote->url[0];
        ret->url = url;
 
-       if (!prefixcmp(url, "rsync://")) {
+       /* maybe it is a foreign URL? */
+       if (url) {
+               const char *p = url;
+
+               while (is_urlschemechar(p == url, *p))
+                       p++;
+               if (!prefixcmp(p, "::"))
+                       helper = xstrndup(url, p - url);
+       }
+
+       if (helper) {
+               transport_helper_init(ret, helper);
+       } else if (!prefixcmp(url, "rsync:")) {
                ret->get_refs_list = get_refs_via_rsync;
                ret->fetch = fetch_objs_via_rsync;
                ret->push = rsync_transport_push;
-
-       } else if (!prefixcmp(url, "http://")
-               || !prefixcmp(url, "https://")
-               || !prefixcmp(url, "ftp://")) {
-#ifdef NO_CURL
-               error("git was compiled without libcurl support.");
-#else
-               ret->get_refs_list = get_refs_via_curl;
-               ret->fetch = fetch_objs_via_curl;
-               ret->push = curl_transport_push;
-#endif
-               ret->disconnect = disconnect_walker;
-
+               ret->smart_options = NULL;
        } else if (is_local(url) && is_file(url)) {
                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
                ret->data = data;
                ret->get_refs_list = get_refs_from_bundle;
                ret->fetch = fetch_refs_from_bundle;
                ret->disconnect = close_bundle;
-
-       } else {
+               ret->smart_options = NULL;
+       } else if (!is_url(url)
+               || !prefixcmp(url, "file://")
+               || !prefixcmp(url, "git://")
+               || !prefixcmp(url, "ssh://")
+               || !prefixcmp(url, "git+ssh://")
+               || !prefixcmp(url, "ssh+git://")) {
+               /* These are builtin smart transports. */
                struct git_transport_data *data = xcalloc(1, sizeof(*data));
                ret->data = data;
-               ret->set_option = set_git_option;
+               ret->set_option = NULL;
                ret->get_refs_list = get_refs_via_connect;
                ret->fetch = fetch_refs_via_pack;
-               ret->push = git_transport_push;
+               ret->push_refs = git_transport_push;
+               ret->connect = connect_git;
                ret->disconnect = disconnect_git;
+               ret->smart_options = &(data->options);
 
-               data->thin = 1;
                data->conn = NULL;
-               data->uploadpack = "git-upload-pack";
-               if (remote && remote->uploadpack)
-                       data->uploadpack = remote->uploadpack;
-               data->receivepack = "git-receive-pack";
-               if (remote && remote->receivepack)
-                       data->receivepack = remote->receivepack;
+               data->got_remote_heads = 0;
+       } else {
+               /* Unknown protocol in URL. Pass to external handler. */
+               int len = external_specification_len(url);
+               char *handler = xmalloc(len + 1);
+               handler[len] = 0;
+               strncpy(handler, url, len);
+               transport_helper_init(ret, handler);
+       }
+
+       if (ret->smart_options) {
+               ret->smart_options->thin = 1;
+               ret->smart_options->uploadpack = "git-upload-pack";
+               if (remote->uploadpack)
+                       ret->smart_options->uploadpack = remote->uploadpack;
+               ret->smart_options->receivepack = "git-receive-pack";
+               if (remote->receivepack)
+                       ret->smart_options->receivepack = remote->receivepack;
        }
 
        return ret;
@@ -776,42 +964,153 @@ struct transport *transport_get(struct remote *remote, const char *url)
 int transport_set_option(struct transport *transport,
                         const char *name, const char *value)
 {
+       int git_reports = 1, protocol_reports = 1;
+
+       if (transport->smart_options)
+               git_reports = set_git_option(transport->smart_options,
+                                            name, value);
+
        if (transport->set_option)
-               return transport->set_option(transport, name, value);
+               protocol_reports = transport->set_option(transport, name,
+                                                       value);
+
+       /* If either report is 0, report 0 (success). */
+       if (!git_reports || !protocol_reports)
+               return 0;
+       /* If either reports -1 (invalid value), report -1. */
+       if ((git_reports == -1) || (protocol_reports == -1))
+               return -1;
+       /* Otherwise if both report unknown, report unknown. */
        return 1;
 }
 
+void transport_set_verbosity(struct transport *transport, int verbosity,
+       int force_progress)
+{
+       if (verbosity >= 2)
+               transport->verbose = verbosity <= 3 ? verbosity : 3;
+       if (verbosity < 0)
+               transport->verbose = -1;
+
+       /**
+        * Rules used to determine whether to report progress (processing aborts
+        * when a rule is satisfied):
+        *
+        *   1. Report progress, if force_progress is 1 (ie. --progress).
+        *   2. Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
+        *   3. Report progress if isatty(2) is 1.
+        **/
+       transport->progress = force_progress || (verbosity >= 0 && isatty(2));
+}
+
 int transport_push(struct transport *transport,
-                  int refspec_nr, const char **refspec, int flags)
+                  int refspec_nr, const char **refspec, int flags,
+                  int *nonfastforward)
 {
-       if (!transport->push)
-               return 1;
-       return transport->push(transport, refspec_nr, refspec, flags);
+       *nonfastforward = 0;
+       transport_verify_remote_names(refspec_nr, refspec);
+
+       if (transport->push) {
+               /* Maybe FIXME. But no important transport uses this case. */
+               if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
+                       die("This transport does not support using --set-upstream");
+
+               return transport->push(transport, refspec_nr, refspec, flags);
+       } else if (transport->push_refs) {
+               struct ref *remote_refs =
+                       transport->get_refs_list(transport, 1);
+               struct ref *local_refs = get_local_heads();
+               int match_flags = MATCH_REFS_NONE;
+               int verbose = (transport->verbose > 0);
+               int quiet = (transport->verbose < 0);
+               int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
+               int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
+               int push_ret, ret, err;
+
+               if (flags & TRANSPORT_PUSH_ALL)
+                       match_flags |= MATCH_REFS_ALL;
+               if (flags & TRANSPORT_PUSH_MIRROR)
+                       match_flags |= MATCH_REFS_MIRROR;
+
+               if (match_refs(local_refs, &remote_refs,
+                              refspec_nr, refspec, match_flags)) {
+                       return -1;
+               }
+
+               set_ref_status_for_push(remote_refs,
+                       flags & TRANSPORT_PUSH_MIRROR,
+                       flags & TRANSPORT_PUSH_FORCE);
+
+               push_ret = transport->push_refs(transport, remote_refs, flags);
+               err = push_had_errors(remote_refs);
+               ret = push_ret | err;
+
+               if (!quiet || err)
+                       transport_print_push_status(transport->url, remote_refs,
+                                       verbose | porcelain, porcelain,
+                                       nonfastforward);
+
+               if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
+                       set_upstreams(transport, remote_refs, pretend);
+
+               if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
+                       struct ref *ref;
+                       for (ref = remote_refs; ref; ref = ref->next)
+                               transport_update_tracking_ref(transport->remote, ref, verbose);
+               }
+
+               if (porcelain && !push_ret)
+                       puts("Done");
+               else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
+                       fprintf(stderr, "Everything up-to-date\n");
+
+               return ret;
+       }
+       return 1;
 }
 
 const struct ref *transport_get_remote_refs(struct transport *transport)
 {
-       if (!transport->remote_refs)
-               transport->remote_refs = transport->get_refs_list(transport);
+       if (!transport->got_remote_refs) {
+               transport->remote_refs = transport->get_refs_list(transport, 0);
+               transport->got_remote_refs = 1;
+       }
+
        return transport->remote_refs;
 }
 
-int transport_fetch_refs(struct transport *transport, const struct ref *refs)
+int transport_fetch_refs(struct transport *transport, struct ref *refs)
 {
        int rc;
-       int nr_heads = 0, nr_alloc = 0;
-       const struct ref **heads = NULL;
-       const struct ref *rm;
+       int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
+       struct ref **heads = NULL;
+       struct ref *rm;
 
        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))
                        continue;
                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
                heads[nr_heads++] = rm;
        }
 
+       if (!nr_heads) {
+               /*
+                * When deepening of a shallow repository is requested,
+                * then local and remote refs are likely to still be equal.
+                * Just feed them all to the fetch method in that case.
+                * This condition shouldn't be met in a non-deepening fetch
+                * (see builtin-fetch.c:quickfetch()).
+                */
+               heads = xmalloc(nr_refs * sizeof(*heads));
+               for (rm = refs; rm; rm = rm->next)
+                       heads[nr_heads++] = rm;
+       }
+
        rc = transport->fetch(transport, nr_heads, heads);
+
        free(heads);
        return rc;
 }
@@ -819,12 +1118,21 @@ int transport_fetch_refs(struct transport *transport, const struct ref *refs)
 void transport_unlock_pack(struct transport *transport)
 {
        if (transport->pack_lockfile) {
-               unlink(transport->pack_lockfile);
+               unlink_or_warn(transport->pack_lockfile);
                free(transport->pack_lockfile);
                transport->pack_lockfile = NULL;
        }
 }
 
+int transport_connect(struct transport *transport, const char *name,
+                     const char *exec, int fd[2])
+{
+       if (transport->connect)
+               return transport->connect(transport, name, exec, fd);
+       else
+               die("Operation not supported by protocol");
+}
+
 int transport_disconnect(struct transport *transport)
 {
        int ret = 0;
@@ -833,3 +1141,99 @@ int transport_disconnect(struct transport *transport)
        free(transport);
        return ret;
 }
+
+/*
+ * Strip username (and password) from an url and return
+ * it in a newly allocated string.
+ */
+char *transport_anonymize_url(const char *url)
+{
+       char *anon_url, *scheme_prefix, *anon_part;
+       size_t anon_len, prefix_len = 0;
+
+       anon_part = strchr(url, '@');
+       if (is_local(url) || !anon_part)
+               goto literal_copy;
+
+       anon_len = strlen(++anon_part);
+       scheme_prefix = strstr(url, "://");
+       if (!scheme_prefix) {
+               if (!strchr(anon_part, ':'))
+                       /* cannot be "me@there:/path/name" */
+                       goto literal_copy;
+       } else {
+               const char *cp;
+               /* make sure scheme is reasonable */
+               for (cp = url; cp < scheme_prefix; cp++) {
+                       switch (*cp) {
+                               /* RFC 1738 2.1 */
+                       case '+': case '.': case '-':
+                               break; /* ok */
+                       default:
+                               if (isalnum(*cp))
+                                       break;
+                               /* it isn't */
+                               goto literal_copy;
+                       }
+               }
+               /* @ past the first slash does not count */
+               cp = strchr(scheme_prefix + 3, '/');
+               if (cp && cp < anon_part)
+                       goto literal_copy;
+               prefix_len = scheme_prefix - url + 3;
+       }
+       anon_url = xcalloc(1, 1 + prefix_len + anon_len);
+       memcpy(anon_url, url, prefix_len);
+       memcpy(anon_url + prefix_len, anon_part, anon_len);
+       return anon_url;
+literal_copy:
+       return xstrdup(url);
+}
+
+struct alternate_refs_data {
+       alternate_ref_fn *fn;
+       void *data;
+};
+
+static int refs_from_alternate_cb(struct alternate_object_database *e,
+                                 void *data)
+{
+       char *other;
+       size_t len;
+       struct remote *remote;
+       struct transport *transport;
+       const struct ref *extra;
+       struct alternate_refs_data *cb = data;
+
+       e->name[-1] = '\0';
+       other = xstrdup(real_path(e->base));
+       e->name[-1] = '/';
+       len = strlen(other);
+
+       while (other[len-1] == '/')
+               other[--len] = '\0';
+       if (len < 8 || memcmp(other + len - 8, "/objects", 8))
+               return 0;
+       /* Is this a git repository with refs? */
+       memcpy(other + len - 8, "/refs", 6);
+       if (!is_directory(other))
+               return 0;
+       other[len - 8] = '\0';
+       remote = remote_get(other);
+       transport = transport_get(remote, other);
+       for (extra = transport_get_remote_refs(transport);
+            extra;
+            extra = extra->next)
+               cb->fn(extra, cb->data);
+       transport_disconnect(transport);
+       free(other);
+       return 0;
+}
+
+void for_each_alternate_ref(alternate_ref_fn fn, void *data)
+{
+       struct alternate_refs_data cb;
+       cb.fn = fn;
+       cb.data = data;
+       foreach_alt_odb(refs_from_alternate_cb, &cb);
+}