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_in_full(data->helper->in, "capabilities\n", 13);
  41         file = fdopen(helper->out, "r");
  42         while (1) {
  43                 if (strbuf_getline(&buf, file, '\n') == EOF)
  44                         exit(128); /* child died, message supplied already */
  45
  46                 if (!*buf.buf)
  47                         break;
  48                 if (!strcmp(buf.buf, "fetch"))
  49                         data->fetch = 1;
  50         }
  51         return data->helper;
  52 }
  53
  54 static int disconnect_helper(struct transport *transport)
  55 {
  56         struct helper_data *data = transport->data;
  57         if (data->helper) {
  58                 write_in_full(data->helper->in, "\n", 1);
  59                 close(data->helper->in);
  60                 finish_command(data->helper);
  61                 free((char *)data->helper->argv[0]);
  62                 free(data->helper->argv);
  63                 free(data->helper);
  64                 data->helper = NULL;
  65         }
  66         return 0;
  67 }
  68
  69 static int fetch_with_fetch(struct transport *transport,
  70                             int nr_heads, const struct ref **to_fetch)
  71 {
  72         struct child_process *helper = get_helper(transport);
  73         FILE *file = fdopen(helper->out, "r");
  74         int i;
  75         struct strbuf buf = STRBUF_INIT;
  76
  77         for (i = 0; i < nr_heads; i++) {
  78                 const struct ref *posn = to_fetch[i];
  79                 if (posn->status & REF_STATUS_UPTODATE)
  80                         continue;
  81                 write_in_full(helper->in, "fetch ", 6);
  82                 write_in_full(helper->in, sha1_to_hex(posn->old_sha1), 40);
  83                 write_in_full(helper->in, " ", 1);
  84                 write_in_full(helper->in, posn->name, strlen(posn->name));
  85                 write_in_full(helper->in, "\n", 1);
  86                 if (strbuf_getline(&buf, file, '\n') == EOF)
  87                         exit(128); /* child died, message supplied already */
  88         }
  89         return 0;
  90 }
  91
  92 static int fetch(struct transport *transport,
  93                  int nr_heads, const struct ref **to_fetch)
  94 {
  95         struct helper_data *data = transport->data;
  96         int i, count;
  97
  98         count = 0;
  99         for (i = 0; i < nr_heads; i++)
 100                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 101                         count++;
 102
 103         if (!count)
 104                 return 0;
 105
 106         if (data->fetch)
 107                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 108
 109         return -1;
 110 }
 111
 112 static struct ref *get_refs_list(struct transport *transport, int for_push)
 113 {
 114         struct child_process *helper;
 115         struct ref *ret = NULL;
 116         struct ref **tail = &ret;
 117         struct ref *posn;
 118         struct strbuf buf = STRBUF_INIT;
 119         FILE *file;
 120
 121         helper = get_helper(transport);
 122         write_in_full(helper->in, "list\n", 5);
 123
 124         file = fdopen(helper->out, "r");
 125         while (1) {
 126                 char *eov, *eon;
 127                 if (strbuf_getline(&buf, file, '\n') == EOF)
 128                         exit(128); /* child died, message supplied already */
 129
 130                 if (!*buf.buf)
 131                         break;
 132
 133                 eov = strchr(buf.buf, ' ');
 134                 if (!eov)
 135                         die("Malformed response in ref list: %s", buf.buf);
 136                 eon = strchr(eov + 1, ' ');
 137                 *eov = '\0';
 138                 if (eon)
 139                         *eon = '\0';
 140                 *tail = alloc_ref(eov + 1);
 141                 if (buf.buf[0] == '@')
 142                         (*tail)->symref = xstrdup(buf.buf + 1);
 143                 else if (buf.buf[0] != '?')
 144                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 145                 tail = &((*tail)->next);
 146         }
 147         strbuf_release(&buf);
 148
 149         for (posn = ret; posn; posn = posn->next)
 150                 resolve_remote_symref(posn, ret);
 151
 152         return ret;
 153 }
 154
 155 int transport_helper_init(struct transport *transport, const char *name)
 156 {
 157         struct helper_data *data = xcalloc(sizeof(*data), 1);
 158         data->name = name;
 159
 160         transport->data = data;
 161         transport->get_refs_list = get_refs_list;
 162         transport->fetch = fetch;
 163         transport->disconnect = disconnect_helper;
 164         return 0;
 165 }