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         unsigned fetch : 1;
  14 };
  15
  16 static struct child_process *get_helper(struct transport *transport)
  17 {
  18         struct helper_data *data = transport->data;
  19         struct strbuf buf = STRBUF_INIT;
  20         struct child_process *helper;
  21         FILE *file;
  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         file = xfdopen(helper->out, "r");
  43         while (1) {
  44                 if (strbuf_getline(&buf, file, '\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                 finish_command(data->helper);
  62                 free((char *)data->helper->argv[0]);
  63                 free(data->helper->argv);
  64                 free(data->helper);
  65                 data->helper = NULL;
  66         }
  67         return 0;
  68 }
  69
  70 static int fetch_with_fetch(struct transport *transport,
  71                             int nr_heads, const struct ref **to_fetch)
  72 {
  73         struct child_process *helper = get_helper(transport);
  74         FILE *file = xfdopen(helper->out, "r");
  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                 write_in_full(helper->in, buf.buf, buf.len);
  86                 strbuf_reset(&buf);
  87
  88                 if (strbuf_getline(&buf, file, '\n') == EOF)
  89                         exit(128); /* child died, message supplied already */
  90         }
  91         return 0;
  92 }
  93
  94 static int fetch(struct transport *transport,
  95                  int nr_heads, const struct ref **to_fetch)
  96 {
  97         struct helper_data *data = transport->data;
  98         int i, count;
  99
 100         count = 0;
 101         for (i = 0; i < nr_heads; i++)
 102                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 103                         count++;
 104
 105         if (!count)
 106                 return 0;
 107
 108         if (data->fetch)
 109                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 110
 111         return -1;
 112 }
 113
 114 static struct ref *get_refs_list(struct transport *transport, int for_push)
 115 {
 116         struct child_process *helper;
 117         struct ref *ret = NULL;
 118         struct ref **tail = &ret;
 119         struct ref *posn;
 120         struct strbuf buf = STRBUF_INIT;
 121         FILE *file;
 122
 123         helper = get_helper(transport);
 124
 125         write_str_in_full(helper->in, "list\n");
 126
 127         file = xfdopen(helper->out, "r");
 128         while (1) {
 129                 char *eov, *eon;
 130                 if (strbuf_getline(&buf, file, '\n') == EOF)
 131                         exit(128); /* child died, message supplied already */
 132
 133                 if (!*buf.buf)
 134                         break;
 135
 136                 eov = strchr(buf.buf, ' ');
 137                 if (!eov)
 138                         die("Malformed response in ref list: %s", buf.buf);
 139                 eon = strchr(eov + 1, ' ');
 140                 *eov = '\0';
 141                 if (eon)
 142                         *eon = '\0';
 143                 *tail = alloc_ref(eov + 1);
 144                 if (buf.buf[0] == '@')
 145                         (*tail)->symref = xstrdup(buf.buf + 1);
 146                 else if (buf.buf[0] != '?')
 147                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 148                 tail = &((*tail)->next);
 149         }
 150         strbuf_release(&buf);
 151
 152         for (posn = ret; posn; posn = posn->next)
 153                 resolve_remote_symref(posn, ret);
 154
 155         return ret;
 156 }
 157
 158 int transport_helper_init(struct transport *transport, const char *name)
 159 {
 160         struct helper_data *data = xcalloc(sizeof(*data), 1);
 161         data->name = name;
 162
 163         transport->data = data;
 164         transport->get_refs_list = get_refs_list;
 165         transport->fetch = fetch;
 166         transport->disconnect = disconnect_helper;
 167         return 0;
 168 }