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         strbuf_addstr(&buf, "capabilities\n");
  41         write_in_full(helper->in, buf.buf, buf.len);
  42         strbuf_reset(&buf);
  43
  44         file = fdopen(helper->out, "r");
  45         while (1) {
  46                 if (strbuf_getline(&buf, file, '\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         }
  54         return data->helper;
  55 }
  56
  57 static int disconnect_helper(struct transport *transport)
  58 {
  59         struct helper_data *data = transport->data;
  60         if (data->helper) {
  61                 write_in_full(data->helper->in, "\n", 1);
  62                 close(data->helper->in);
  63                 finish_command(data->helper);
  64                 free((char *)data->helper->argv[0]);
  65                 free(data->helper->argv);
  66                 free(data->helper);
  67                 data->helper = NULL;
  68         }
  69         return 0;
  70 }
  71
  72 static int fetch_with_fetch(struct transport *transport,
  73                             int nr_heads, const struct ref **to_fetch)
  74 {
  75         struct child_process *helper = get_helper(transport);
  76         FILE *file = fdopen(helper->out, "r");
  77         int i;
  78         struct strbuf buf = STRBUF_INIT;
  79
  80         for (i = 0; i < nr_heads; i++) {
  81                 const struct ref *posn = to_fetch[i];
  82                 if (posn->status & REF_STATUS_UPTODATE)
  83                         continue;
  84
  85                 strbuf_addf(&buf, "fetch %s %s\n",
  86                             sha1_to_hex(posn->old_sha1), posn->name);
  87                 write_in_full(helper->in, buf.buf, buf.len);
  88                 strbuf_reset(&buf);
  89
  90                 if (strbuf_getline(&buf, file, '\n') == EOF)
  91                         exit(128); /* child died, message supplied already */
  92         }
  93         return 0;
  94 }
  95
  96 static int fetch(struct transport *transport,
  97                  int nr_heads, const struct ref **to_fetch)
  98 {
  99         struct helper_data *data = transport->data;
 100         int i, count;
 101
 102         count = 0;
 103         for (i = 0; i < nr_heads; i++)
 104                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 105                         count++;
 106
 107         if (!count)
 108                 return 0;
 109
 110         if (data->fetch)
 111                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 112
 113         return -1;
 114 }
 115
 116 static struct ref *get_refs_list(struct transport *transport, int for_push)
 117 {
 118         struct child_process *helper;
 119         struct ref *ret = NULL;
 120         struct ref **tail = &ret;
 121         struct ref *posn;
 122         struct strbuf buf = STRBUF_INIT;
 123         FILE *file;
 124
 125         helper = get_helper(transport);
 126
 127         strbuf_addstr(&buf, "list\n");
 128         write_in_full(helper->in, buf.buf, buf.len);
 129         strbuf_reset(&buf);
 130
 131         file = fdopen(helper->out, "r");
 132         while (1) {
 133                 char *eov, *eon;
 134                 if (strbuf_getline(&buf, file, '\n') == EOF)
 135                         exit(128); /* child died, message supplied already */
 136
 137                 if (!*buf.buf)
 138                         break;
 139
 140                 eov = strchr(buf.buf, ' ');
 141                 if (!eov)
 142                         die("Malformed response in ref list: %s", buf.buf);
 143                 eon = strchr(eov + 1, ' ');
 144                 *eov = '\0';
 145                 if (eon)
 146                         *eon = '\0';
 147                 *tail = alloc_ref(eov + 1);
 148                 if (buf.buf[0] == '@')
 149                         (*tail)->symref = xstrdup(buf.buf + 1);
 150                 else if (buf.buf[0] != '?')
 151                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 152                 tail = &((*tail)->next);
 153         }
 154         strbuf_release(&buf);
 155
 156         for (posn = ret; posn; posn = posn->next)
 157                 resolve_remote_symref(posn, ret);
 158
 159         return ret;
 160 }
 161
 162 int transport_helper_init(struct transport *transport, const char *name)
 163 {
 164         struct helper_data *data = xcalloc(sizeof(*data), 1);
 165         data->name = name;
 166
 167         transport->data = data;
 168         transport->get_refs_list = get_refs_list;
 169         transport->fetch = fetch;
 170         transport->disconnect = disconnect_helper;
 171         return 0;
 172 }