Andrew's git - gitweb.git/blob

da8185a98150fddf692c9ead76097acbe7b9b41c
   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 "remote.h"
   9
  10struct helper_data
  11{
  12        const char *name;
  13        struct child_process *helper;
  14        unsigned fetch : 1;
  15        unsigned import : 1;
  16        /* These go from remote name (as in "list") to private name */
  17        struct refspec *refspecs;
  18        int refspec_nr;
  19};
  20
  21static struct child_process *get_helper(struct transport *transport)
  22{
  23        struct helper_data *data = transport->data;
  24        struct strbuf buf = STRBUF_INIT;
  25        struct child_process *helper;
  26        FILE *file;
  27        const char **refspecs = NULL;
  28        int refspec_nr = 0;
  29        int refspec_alloc = 0;
  30
  31        if (data->helper)
  32                return data->helper;
  33
  34        helper = xcalloc(1, sizeof(*helper));
  35        helper->in = -1;
  36        helper->out = -1;
  37        helper->err = 0;
  38        helper->argv = xcalloc(4, sizeof(*helper->argv));
  39        strbuf_addf(&buf, "remote-%s", data->name);
  40        helper->argv[0] = strbuf_detach(&buf, NULL);
  41        helper->argv[1] = transport->remote->name;
  42        helper->argv[2] = transport->url;
  43        helper->git_cmd = 1;
  44        if (start_command(helper))
  45                die("Unable to run helper: git %s", helper->argv[0]);
  46        data->helper = helper;
  47
  48        write_str_in_full(helper->in, "capabilities\n");
  49
  50        file = xfdopen(helper->out, "r");
  51        while (1) {
  52                if (strbuf_getline(&buf, file, '\n') == EOF)
  53                        exit(128); /* child died, message supplied already */
  54
  55                if (!*buf.buf)
  56                        break;
  57                if (!strcmp(buf.buf, "fetch"))
  58                        data->fetch = 1;
  59                if (!strcmp(buf.buf, "import"))
  60                        data->import = 1;
  61                if (!data->refspecs && !prefixcmp(buf.buf, "refspec ")) {
  62                        ALLOC_GROW(refspecs,
  63                                   refspec_nr + 1,
  64                                   refspec_alloc);
  65                        refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
  66                }
  67        }
  68        if (refspecs) {
  69                int i;
  70                data->refspec_nr = refspec_nr;
  71                data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
  72                for (i = 0; i < refspec_nr; i++) {
  73                        free((char *)refspecs[i]);
  74                }
  75                free(refspecs);
  76        }
  77        return data->helper;
  78}
  79
  80static int disconnect_helper(struct transport *transport)
  81{
  82        struct helper_data *data = transport->data;
  83        if (data->helper) {
  84                write_str_in_full(data->helper->in, "\n");
  85                close(data->helper->in);
  86                finish_command(data->helper);
  87                free((char *)data->helper->argv[0]);
  88                free(data->helper->argv);
  89                free(data->helper);
  90                data->helper = NULL;
  91        }
  92        return 0;
  93}
  94
  95static int release_helper(struct transport *transport)
  96{
  97        struct helper_data *data = transport->data;
  98        free_refspec(data->refspec_nr, data->refspecs);
  99        data->refspecs = NULL;
 100        disconnect_helper(transport);
 101        free(transport->data);
 102        return 0;
 103}
 104
 105static int fetch_with_fetch(struct transport *transport,
 106                            int nr_heads, struct ref **to_fetch)
 107{
 108        struct child_process *helper = get_helper(transport);
 109        FILE *file = xfdopen(helper->out, "r");
 110        int i;
 111        struct strbuf buf = STRBUF_INIT;
 112
 113        for (i = 0; i < nr_heads; i++) {
 114                const struct ref *posn = to_fetch[i];
 115                if (posn->status & REF_STATUS_UPTODATE)
 116                        continue;
 117
 118                strbuf_addf(&buf, "fetch %s %s\n",
 119                            sha1_to_hex(posn->old_sha1), posn->name);
 120                write_in_full(helper->in, buf.buf, buf.len);
 121                strbuf_reset(&buf);
 122
 123                if (strbuf_getline(&buf, file, '\n') == EOF)
 124                        exit(128); /* child died, message supplied already */
 125        }
 126        return 0;
 127}
 128
 129static int get_importer(struct transport *transport, struct child_process *fastimport)
 130{
 131        struct child_process *helper = get_helper(transport);
 132        memset(fastimport, 0, sizeof(*fastimport));
 133        fastimport->in = helper->out;
 134        fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 135        fastimport->argv[0] = "fast-import";
 136        fastimport->argv[1] = "--quiet";
 137
 138        fastimport->git_cmd = 1;
 139        return start_command(fastimport);
 140}
 141
 142static int fetch_with_import(struct transport *transport,
 143                             int nr_heads, struct ref **to_fetch)
 144{
 145        struct child_process fastimport;
 146        struct child_process *helper = get_helper(transport);
 147        struct helper_data *data = transport->data;
 148        int i;
 149        struct ref *posn;
 150        struct strbuf buf = STRBUF_INIT;
 151
 152        if (get_importer(transport, &fastimport))
 153                die("Couldn't run fast-import");
 154
 155        for (i = 0; i < nr_heads; i++) {
 156                posn = to_fetch[i];
 157                if (posn->status & REF_STATUS_UPTODATE)
 158                        continue;
 159
 160                strbuf_addf(&buf, "import %s\n", posn->name);
 161                write_in_full(helper->in, buf.buf, buf.len);
 162                strbuf_reset(&buf);
 163        }
 164        disconnect_helper(transport);
 165        finish_command(&fastimport);
 166
 167        for (i = 0; i < nr_heads; i++) {
 168                char *private;
 169                posn = to_fetch[i];
 170                if (posn->status & REF_STATUS_UPTODATE)
 171                        continue;
 172                if (data->refspecs)
 173                        private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 174                else
 175                        private = strdup(posn->name);
 176                read_ref(private, posn->old_sha1);
 177                free(private);
 178        }
 179        return 0;
 180}
 181
 182static int fetch(struct transport *transport,
 183                 int nr_heads, struct ref **to_fetch)
 184{
 185        struct helper_data *data = transport->data;
 186        int i, count;
 187
 188        count = 0;
 189        for (i = 0; i < nr_heads; i++)
 190                if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 191                        count++;
 192
 193        if (!count)
 194                return 0;
 195
 196        if (data->fetch)
 197                return fetch_with_fetch(transport, nr_heads, to_fetch);
 198
 199        if (data->import)
 200                return fetch_with_import(transport, nr_heads, to_fetch);
 201
 202        return -1;
 203}
 204
 205static struct ref *get_refs_list(struct transport *transport, int for_push)
 206{
 207        struct child_process *helper;
 208        struct ref *ret = NULL;
 209        struct ref **tail = &ret;
 210        struct ref *posn;
 211        struct strbuf buf = STRBUF_INIT;
 212        FILE *file;
 213
 214        helper = get_helper(transport);
 215
 216        write_str_in_full(helper->in, "list\n");
 217
 218        file = xfdopen(helper->out, "r");
 219        while (1) {
 220                char *eov, *eon;
 221                if (strbuf_getline(&buf, file, '\n') == EOF)
 222                        exit(128); /* child died, message supplied already */
 223
 224                if (!*buf.buf)
 225                        break;
 226
 227                eov = strchr(buf.buf, ' ');
 228                if (!eov)
 229                        die("Malformed response in ref list: %s", buf.buf);
 230                eon = strchr(eov + 1, ' ');
 231                *eov = '\0';
 232                if (eon)
 233                        *eon = '\0';
 234                *tail = alloc_ref(eov + 1);
 235                if (buf.buf[0] == '@')
 236                        (*tail)->symref = xstrdup(buf.buf + 1);
 237                else if (buf.buf[0] != '?')
 238                        get_sha1_hex(buf.buf, (*tail)->old_sha1);
 239                tail = &((*tail)->next);
 240        }
 241        strbuf_release(&buf);
 242
 243        for (posn = ret; posn; posn = posn->next)
 244                resolve_remote_symref(posn, ret);
 245
 246        return ret;
 247}
 248
 249int transport_helper_init(struct transport *transport, const char *name)
 250{
 251        struct helper_data *data = xcalloc(sizeof(*data), 1);
 252        data->name = name;
 253
 254        transport->data = data;
 255        transport->get_refs_list = get_refs_list;
 256        transport->fetch = fetch;
 257        transport->disconnect = release_helper;
 258        return 0;
 259}