Andrew's git - gitweb.git/blob

577abc638eb47417277a45a6bd568e24d48e928b
   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#include "quote.h"
   9
  10struct helper_data
  11{
  12        const char *name;
  13        struct child_process *helper;
  14        FILE *out;
  15        unsigned fetch : 1,
  16                option : 1;
  17};
  18
  19static struct child_process *get_helper(struct transport *transport)
  20{
  21        struct helper_data *data = transport->data;
  22        struct strbuf buf = STRBUF_INIT;
  23        struct child_process *helper;
  24
  25        if (data->helper)
  26                return data->helper;
  27
  28        helper = xcalloc(1, sizeof(*helper));
  29        helper->in = -1;
  30        helper->out = -1;
  31        helper->err = 0;
  32        helper->argv = xcalloc(4, sizeof(*helper->argv));
  33        strbuf_addf(&buf, "remote-%s", data->name);
  34        helper->argv[0] = strbuf_detach(&buf, NULL);
  35        helper->argv[1] = transport->remote->name;
  36        helper->argv[2] = transport->url;
  37        helper->git_cmd = 1;
  38        if (start_command(helper))
  39                die("Unable to run helper: git %s", helper->argv[0]);
  40        data->helper = helper;
  41
  42        write_str_in_full(helper->in, "capabilities\n");
  43
  44        data->out = xfdopen(helper->out, "r");
  45        while (1) {
  46                if (strbuf_getline(&buf, data->out, '\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                if (!strcmp(buf.buf, "option"))
  54                        data->option = 1;
  55        }
  56        return data->helper;
  57}
  58
  59static int disconnect_helper(struct transport *transport)
  60{
  61        struct helper_data *data = transport->data;
  62        if (data->helper) {
  63                write_str_in_full(data->helper->in, "\n");
  64                close(data->helper->in);
  65                fclose(data->out);
  66                finish_command(data->helper);
  67                free((char *)data->helper->argv[0]);
  68                free(data->helper->argv);
  69                free(data->helper);
  70                data->helper = NULL;
  71        }
  72        free(data);
  73        return 0;
  74}
  75
  76static const char *unsupported_options[] = {
  77        TRANS_OPT_UPLOADPACK,
  78        TRANS_OPT_RECEIVEPACK,
  79        TRANS_OPT_THIN,
  80        TRANS_OPT_KEEP
  81        };
  82static const char *boolean_options[] = {
  83        TRANS_OPT_THIN,
  84        TRANS_OPT_KEEP,
  85        TRANS_OPT_FOLLOWTAGS
  86        };
  87
  88static int set_helper_option(struct transport *transport,
  89                          const char *name, const char *value)
  90{
  91        struct helper_data *data = transport->data;
  92        struct child_process *helper = get_helper(transport);
  93        struct strbuf buf = STRBUF_INIT;
  94        int i, ret, is_bool = 0;
  95
  96        if (!data->option)
  97                return 1;
  98
  99        for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 100                if (!strcmp(name, unsupported_options[i]))
 101                        return 1;
 102        }
 103
 104        for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 105                if (!strcmp(name, boolean_options[i])) {
 106                        is_bool = 1;
 107                        break;
 108                }
 109        }
 110
 111        strbuf_addf(&buf, "option %s ", name);
 112        if (is_bool)
 113                strbuf_addstr(&buf, value ? "true" : "false");
 114        else
 115                quote_c_style(value, &buf, NULL, 0);
 116        strbuf_addch(&buf, '\n');
 117
 118        if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 119                die_errno("cannot send option to %s", data->name);
 120
 121        strbuf_reset(&buf);
 122        if (strbuf_getline(&buf, data->out, '\n') == EOF)
 123                exit(128); /* child died, message supplied already */
 124
 125        if (!strcmp(buf.buf, "ok"))
 126                ret = 0;
 127        else if (!prefixcmp(buf.buf, "error")) {
 128                ret = -1;
 129        } else if (!strcmp(buf.buf, "unsupported"))
 130                ret = 1;
 131        else {
 132                warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 133                ret = 1;
 134        }
 135        strbuf_release(&buf);
 136        return ret;
 137}
 138
 139static void standard_options(struct transport *t)
 140{
 141        char buf[16];
 142        int n;
 143        int v = t->verbose;
 144        int no_progress = v < 0 || (!t->progress && !isatty(1));
 145
 146        set_helper_option(t, "progress", !no_progress ? "true" : "false");
 147
 148        n = snprintf(buf, sizeof(buf), "%d", v + 1);
 149        if (n >= sizeof(buf))
 150                die("impossibly large verbosity value");
 151        set_helper_option(t, "verbosity", buf);
 152}
 153
 154static int fetch_with_fetch(struct transport *transport,
 155                            int nr_heads, const struct ref **to_fetch)
 156{
 157        struct helper_data *data = transport->data;
 158        int i;
 159        struct strbuf buf = STRBUF_INIT;
 160
 161        standard_options(transport);
 162
 163        for (i = 0; i < nr_heads; i++) {
 164                const struct ref *posn = to_fetch[i];
 165                if (posn->status & REF_STATUS_UPTODATE)
 166                        continue;
 167
 168                strbuf_addf(&buf, "fetch %s %s\n",
 169                            sha1_to_hex(posn->old_sha1), posn->name);
 170        }
 171
 172        strbuf_addch(&buf, '\n');
 173        if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
 174                die_errno("cannot send fetch to %s", data->name);
 175
 176        while (1) {
 177                strbuf_reset(&buf);
 178                if (strbuf_getline(&buf, data->out, '\n') == EOF)
 179                        exit(128); /* child died, message supplied already */
 180
 181                if (!prefixcmp(buf.buf, "lock ")) {
 182                        const char *name = buf.buf + 5;
 183                        if (transport->pack_lockfile)
 184                                warning("%s also locked %s", data->name, name);
 185                        else
 186                                transport->pack_lockfile = xstrdup(name);
 187                }
 188                else if (!buf.len)
 189                        break;
 190                else
 191                        warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 192        }
 193        strbuf_release(&buf);
 194        return 0;
 195}
 196
 197static int fetch(struct transport *transport,
 198                 int nr_heads, const struct ref **to_fetch)
 199{
 200        struct helper_data *data = transport->data;
 201        int i, count;
 202
 203        count = 0;
 204        for (i = 0; i < nr_heads; i++)
 205                if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 206                        count++;
 207
 208        if (!count)
 209                return 0;
 210
 211        if (data->fetch)
 212                return fetch_with_fetch(transport, nr_heads, to_fetch);
 213
 214        return -1;
 215}
 216
 217static struct ref *get_refs_list(struct transport *transport, int for_push)
 218{
 219        struct helper_data *data = transport->data;
 220        struct child_process *helper;
 221        struct ref *ret = NULL;
 222        struct ref **tail = &ret;
 223        struct ref *posn;
 224        struct strbuf buf = STRBUF_INIT;
 225
 226        helper = get_helper(transport);
 227
 228        write_str_in_full(helper->in, "list\n");
 229
 230        while (1) {
 231                char *eov, *eon;
 232                if (strbuf_getline(&buf, data->out, '\n') == EOF)
 233                        exit(128); /* child died, message supplied already */
 234
 235                if (!*buf.buf)
 236                        break;
 237
 238                eov = strchr(buf.buf, ' ');
 239                if (!eov)
 240                        die("Malformed response in ref list: %s", buf.buf);
 241                eon = strchr(eov + 1, ' ');
 242                *eov = '\0';
 243                if (eon)
 244                        *eon = '\0';
 245                *tail = alloc_ref(eov + 1);
 246                if (buf.buf[0] == '@')
 247                        (*tail)->symref = xstrdup(buf.buf + 1);
 248                else if (buf.buf[0] != '?')
 249                        get_sha1_hex(buf.buf, (*tail)->old_sha1);
 250                tail = &((*tail)->next);
 251        }
 252        strbuf_release(&buf);
 253
 254        for (posn = ret; posn; posn = posn->next)
 255                resolve_remote_symref(posn, ret);
 256
 257        return ret;
 258}
 259
 260int transport_helper_init(struct transport *transport, const char *name)
 261{
 262        struct helper_data *data = xcalloc(sizeof(*data), 1);
 263        data->name = name;
 264
 265        transport->data = data;
 266        transport->set_option = set_helper_option;
 267        transport->get_refs_list = get_refs_list;
 268        transport->fetch = fetch;
 269        transport->disconnect = disconnect_helper;
 270        return 0;
 271}