transport-helper.c

   1 #include "cache.h"
   2 #include "transport.h"
   3
   4 #include "run-command.h"
   5 #include "commit.h"
   6 #include "diff.h"
   7 #include "revision.h"
   8 #include "quote.h"
   9
  10 struct helper_data
  11 {
  12         const char *name;
  13         struct child_process *helper;
  14         FILE *out;
  15         unsigned fetch : 1,
  16                 option : 1;
  17 };
  18
  19 static struct child_process *get_helper(struct transport *transport)
  20 {
  21         struct helper_data *data = transport->data;
  22         struct strbuf buf = STRBUF_INIT;
  23         struct child_process *helper;
  24
  25         if (data->helper)
  26                 return data->helper;
  27
  28         helper = xcalloc(1, sizeof(*helper));
  29         helper->in = -1;
  30         helper->out = -1;
  31         helper->err = 0;
  32         helper->argv = xcalloc(4, sizeof(*helper->argv));
  33         strbuf_addf(&buf, "remote-%s", data->name);
  34         helper->argv[0] = strbuf_detach(&buf, NULL);
  35         helper->argv[1] = transport->remote->name;
  36         helper->argv[2] = transport->url;
  37         helper->git_cmd = 1;
  38         if (start_command(helper))
  39                 die("Unable to run helper: git %s", helper->argv[0]);
  40         data->helper = helper;
  41
  42         write_str_in_full(helper->in, "capabilities\n");
  43
  44         data->out = xfdopen(helper->out, "r");
  45         while (1) {
  46                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
  47                         exit(128); /* child died, message supplied already */
  48
  49                 if (!*buf.buf)
  50                         break;
  51                 if (!strcmp(buf.buf, "fetch"))
  52                         data->fetch = 1;
  53                 if (!strcmp(buf.buf, "option"))
  54                         data->option = 1;
  55         }
  56         return data->helper;
  57 }
  58
  59 static int disconnect_helper(struct transport *transport)
  60 {
  61         struct helper_data *data = transport->data;
  62         if (data->helper) {
  63                 write_str_in_full(data->helper->in, "\n");
  64                 close(data->helper->in);
  65                 fclose(data->out);
  66                 finish_command(data->helper);
  67                 free((char *)data->helper->argv[0]);
  68                 free(data->helper->argv);
  69                 free(data->helper);
  70                 data->helper = NULL;
  71         }
  72         free(data);
  73         return 0;
  74 }
  75
  76 static const char *unsupported_options[] = {
  77         TRANS_OPT_UPLOADPACK,
  78         TRANS_OPT_RECEIVEPACK,
  79         TRANS_OPT_THIN,
  80         TRANS_OPT_KEEP
  81         };
  82 static const char *boolean_options[] = {
  83         TRANS_OPT_THIN,
  84         TRANS_OPT_KEEP,
  85         TRANS_OPT_FOLLOWTAGS
  86         };
  87
  88 static int set_helper_option(struct transport *transport,
  89                           const char *name, const char *value)
  90 {
  91         struct helper_data *data = transport->data;
  92         struct child_process *helper = get_helper(transport);
  93         struct strbuf buf = STRBUF_INIT;
  94         int i, ret, is_bool = 0;
  95
  96         if (!data->option)
  97                 return 1;
  98
  99         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 100                 if (!strcmp(name, unsupported_options[i]))
 101                         return 1;
 102         }
 103
 104         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 105                 if (!strcmp(name, boolean_options[i])) {
 106                         is_bool = 1;
 107                         break;
 108                 }
 109         }
 110
 111         strbuf_addf(&buf, "option %s ", name);
 112         if (is_bool)
 113                 strbuf_addstr(&buf, value ? "true" : "false");
 114         else
 115                 quote_c_style(value, &buf, NULL, 0);
 116         strbuf_addch(&buf, '\n');
 117
 118         if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 119                 die_errno("cannot send option to %s", data->name);
 120
 121         strbuf_reset(&buf);
 122         if (strbuf_getline(&buf, data->out, '\n') == EOF)
 123                 exit(128); /* child died, message supplied already */
 124
 125         if (!strcmp(buf.buf, "ok"))
 126                 ret = 0;
 127         else if (!prefixcmp(buf.buf, "error")) {
 128                 ret = -1;
 129         } else if (!strcmp(buf.buf, "unsupported"))
 130                 ret = 1;
 131         else {
 132                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 133                 ret = 1;
 134         }
 135         strbuf_release(&buf);
 136         return ret;
 137 }
 138
 139 static void standard_options(struct transport *t)
 140 {
 141         char buf[16];
 142         int n;
 143         int v = t->verbose;
 144         int no_progress = v < 0 || (!t->progress && !isatty(1));
 145
 146         set_helper_option(t, "progress", !no_progress ? "true" : "false");
 147
 148         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 149         if (n >= sizeof(buf))
 150                 die("impossibly large verbosity value");
 151         set_helper_option(t, "verbosity", buf);
 152 }
 153
 154 static int fetch_with_fetch(struct transport *transport,
 155                             int nr_heads, const struct ref **to_fetch)
 156 {
 157         struct helper_data *data = transport->data;
 158         int i;
 159         struct strbuf buf = STRBUF_INIT;
 160
 161         standard_options(transport);
 162
 163         for (i = 0; i < nr_heads; i++) {
 164                 const struct ref *posn = to_fetch[i];
 165                 if (posn->status & REF_STATUS_UPTODATE)
 166                         continue;
 167
 168                 strbuf_addf(&buf, "fetch %s %s\n",
 169                             sha1_to_hex(posn->old_sha1), posn->name);
 170         }
 171
 172         strbuf_addch(&buf, '\n');
 173         if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
 174                 die_errno("cannot send fetch to %s", data->name);
 175
 176         while (1) {
 177                 strbuf_reset(&buf);
 178                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 179                         exit(128); /* child died, message supplied already */
 180
 181                 if (!prefixcmp(buf.buf, "lock ")) {
 182                         const char *name = buf.buf + 5;
 183                         if (transport->pack_lockfile)
 184                                 warning("%s also locked %s", data->name, name);
 185                         else
 186                                 transport->pack_lockfile = xstrdup(name);
 187                 }
 188                 else if (!buf.len)
 189                         break;
 190                 else
 191                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 192         }
 193         strbuf_release(&buf);
 194         return 0;
 195 }
 196
 197 static int fetch(struct transport *transport,
 198                  int nr_heads, const struct ref **to_fetch)
 199 {
 200         struct helper_data *data = transport->data;
 201         int i, count;
 202
 203         count = 0;
 204         for (i = 0; i < nr_heads; i++)
 205                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 206                         count++;
 207
 208         if (!count)
 209                 return 0;
 210
 211         if (data->fetch)
 212                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 213
 214         return -1;
 215 }
 216
 217 static struct ref *get_refs_list(struct transport *transport, int for_push)
 218 {
 219         struct helper_data *data = transport->data;
 220         struct child_process *helper;
 221         struct ref *ret = NULL;
 222         struct ref **tail = &ret;
 223         struct ref *posn;
 224         struct strbuf buf = STRBUF_INIT;
 225
 226         helper = get_helper(transport);
 227
 228         write_str_in_full(helper->in, "list\n");
 229
 230         while (1) {
 231                 char *eov, *eon;
 232                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 233                         exit(128); /* child died, message supplied already */
 234
 235                 if (!*buf.buf)
 236                         break;
 237
 238                 eov = strchr(buf.buf, ' ');
 239                 if (!eov)
 240                         die("Malformed response in ref list: %s", buf.buf);
 241                 eon = strchr(eov + 1, ' ');
 242                 *eov = '\0';
 243                 if (eon)
 244                         *eon = '\0';
 245                 *tail = alloc_ref(eov + 1);
 246                 if (buf.buf[0] == '@')
 247                         (*tail)->symref = xstrdup(buf.buf + 1);
 248                 else if (buf.buf[0] != '?')
 249                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 250                 tail = &((*tail)->next);
 251         }
 252         strbuf_release(&buf);
 253
 254         for (posn = ret; posn; posn = posn->next)
 255                 resolve_remote_symref(posn, ret);
 256
 257         return ret;
 258 }
 259
 260 int transport_helper_init(struct transport *transport, const char *name)
 261 {
 262         struct helper_data *data = xcalloc(sizeof(*data), 1);
 263         data->name = name;
 264
 265         transport->data = data;
 266         transport->set_option = set_helper_option;
 267         transport->get_refs_list = get_refs_list;
 268         transport->fetch = fetch;
 269         transport->disconnect = disconnect_helper;
 270         return 0;
 271 }