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
   9 struct helper_data
  10 {
  11         const char *name;
  12         struct child_process *helper;
  13         FILE *out;
  14         unsigned fetch : 1;
  15 };
  16
  17 static struct child_process *get_helper(struct transport *transport)
  18 {
  19         struct helper_data *data = transport->data;
  20         struct strbuf buf = STRBUF_INIT;
  21         struct child_process *helper;
  22
  23         if (data->helper)
  24                 return data->helper;
  25
  26         helper = xcalloc(1, sizeof(*helper));
  27         helper->in = -1;
  28         helper->out = -1;
  29         helper->err = 0;
  30         helper->argv = xcalloc(4, sizeof(*helper->argv));
  31         strbuf_addf(&buf, "remote-%s", data->name);
  32         helper->argv[0] = strbuf_detach(&buf, NULL);
  33         helper->argv[1] = transport->remote->name;
  34         helper->argv[2] = transport->url;
  35         helper->git_cmd = 1;
  36         if (start_command(helper))
  37                 die("Unable to run helper: git %s", helper->argv[0]);
  38         data->helper = helper;
  39
  40         write_str_in_full(helper->in, "capabilities\n");
  41
  42         data->out = xfdopen(helper->out, "r");
  43         while (1) {
  44                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
  45                         exit(128); /* child died, message supplied already */
  46
  47                 if (!*buf.buf)
  48                         break;
  49                 if (!strcmp(buf.buf, "fetch"))
  50                         data->fetch = 1;
  51         }
  52         return data->helper;
  53 }
  54
  55 static int disconnect_helper(struct transport *transport)
  56 {
  57         struct helper_data *data = transport->data;
  58         if (data->helper) {
  59                 write_str_in_full(data->helper->in, "\n");
  60                 close(data->helper->in);
  61                 fclose(data->out);
  62                 finish_command(data->helper);
  63                 free((char *)data->helper->argv[0]);
  64                 free(data->helper->argv);
  65                 free(data->helper);
  66                 data->helper = NULL;
  67         }
  68         return 0;
  69 }
  70
  71 static int fetch_with_fetch(struct transport *transport,
  72                             int nr_heads, const struct ref **to_fetch)
  73 {
  74         struct helper_data *data = transport->data;
  75         int i;
  76         struct strbuf buf = STRBUF_INIT;
  77
  78         for (i = 0; i < nr_heads; i++) {
  79                 const struct ref *posn = to_fetch[i];
  80                 if (posn->status & REF_STATUS_UPTODATE)
  81                         continue;
  82
  83                 strbuf_addf(&buf, "fetch %s %s\n",
  84                             sha1_to_hex(posn->old_sha1), posn->name);
  85         }
  86
  87         strbuf_addch(&buf, '\n');
  88         if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
  89                 die_errno("cannot send fetch to %s", data->name);
  90
  91         while (1) {
  92                 strbuf_reset(&buf);
  93                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
  94                         exit(128); /* child died, message supplied already */
  95
  96                 if (!prefixcmp(buf.buf, "lock ")) {
  97                         const char *name = buf.buf + 5;
  98                         if (transport->pack_lockfile)
  99                                 warning("%s also locked %s", data->name, name);
 100                         else
 101                                 transport->pack_lockfile = xstrdup(name);
 102                 }
 103                 else if (!buf.len)
 104                         break;
 105                 else
 106                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 107         }
 108         strbuf_release(&buf);
 109         return 0;
 110 }
 111
 112 static int fetch(struct transport *transport,
 113                  int nr_heads, const struct ref **to_fetch)
 114 {
 115         struct helper_data *data = transport->data;
 116         int i, count;
 117
 118         count = 0;
 119         for (i = 0; i < nr_heads; i++)
 120                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 121                         count++;
 122
 123         if (!count)
 124                 return 0;
 125
 126         if (data->fetch)
 127                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 128
 129         return -1;
 130 }
 131
 132 static struct ref *get_refs_list(struct transport *transport, int for_push)
 133 {
 134         struct helper_data *data = transport->data;
 135         struct child_process *helper;
 136         struct ref *ret = NULL;
 137         struct ref **tail = &ret;
 138         struct ref *posn;
 139         struct strbuf buf = STRBUF_INIT;
 140
 141         helper = get_helper(transport);
 142
 143         write_str_in_full(helper->in, "list\n");
 144
 145         while (1) {
 146                 char *eov, *eon;
 147                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 148                         exit(128); /* child died, message supplied already */
 149
 150                 if (!*buf.buf)
 151                         break;
 152
 153                 eov = strchr(buf.buf, ' ');
 154                 if (!eov)
 155                         die("Malformed response in ref list: %s", buf.buf);
 156                 eon = strchr(eov + 1, ' ');
 157                 *eov = '\0';
 158                 if (eon)
 159                         *eon = '\0';
 160                 *tail = alloc_ref(eov + 1);
 161                 if (buf.buf[0] == '@')
 162                         (*tail)->symref = xstrdup(buf.buf + 1);
 163                 else if (buf.buf[0] != '?')
 164                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 165                 tail = &((*tail)->next);
 166         }
 167         strbuf_release(&buf);
 168
 169         for (posn = ret; posn; posn = posn->next)
 170                 resolve_remote_symref(posn, ret);
 171
 172         return ret;
 173 }
 174
 175 int transport_helper_init(struct transport *transport, const char *name)
 176 {
 177         struct helper_data *data = xcalloc(sizeof(*data), 1);
 178         data->name = name;
 179
 180         transport->data = data;
 181         transport->get_refs_list = get_refs_list;
 182         transport->fetch = fetch;
 183         transport->disconnect = disconnect_helper;
 184         return 0;
 185 }