Andrew's git - gitweb.git/blob - 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
   9struct helper_data
  10{
  11        const char *name;
  12        struct child_process *helper;
  13        unsigned fetch : 1;
  14};
  15
  16static 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
  57static 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
  72static 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
  96static 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
 116static 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
 162int 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}