Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "url.h"
   5#include "exec_cmd.h"
   6#include "run-command.h"
   7#include "vcs-svn/svndump.h"
   8#include "notes.h"
   9#include "argv-array.h"
  10
  11static const char *url;
  12static int dump_from_file;
  13static const char *private_ref;
  14static const char *remote_ref = "refs/heads/master";
  15static const char *marksfilename, *notes_ref;
  16struct rev_note { unsigned int rev_nr; };
  17
  18static int cmd_capabilities(const char *line);
  19static int cmd_import(const char *line);
  20static int cmd_list(const char *line);
  21
  22typedef int (*input_command_handler)(const char *);
  23struct input_command_entry {
  24        const char *name;
  25        input_command_handler fn;
  26        unsigned char batchable;        /* whether the command starts or is part of a batch */
  27};
  28
  29static const struct input_command_entry input_command_list[] = {
  30        { "capabilities", cmd_capabilities, 0 },
  31        { "import", cmd_import, 1 },
  32        { "list", cmd_list, 0 },
  33        { NULL, NULL }
  34};
  35
  36static int cmd_capabilities(const char *line)
  37{
  38        printf("import\n");
  39        printf("bidi-import\n");
  40        printf("refspec %s:%s\n\n", remote_ref, private_ref);
  41        fflush(stdout);
  42        return 0;
  43}
  44
  45static void terminate_batch(void)
  46{
  47        /* terminate a current batch's fast-import stream */
  48        printf("done\n");
  49        fflush(stdout);
  50}
  51
  52/* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
  53static char *read_ref_note(const unsigned char sha1[20])
  54{
  55        const unsigned char *note_sha1;
  56        char *msg = NULL;
  57        unsigned long msglen;
  58        enum object_type type;
  59
  60        init_notes(NULL, notes_ref, NULL, 0);
  61        if (!(note_sha1 = get_note(NULL, sha1)))
  62                return NULL;    /* note tree not found */
  63        if (!(msg = read_sha1_file(note_sha1, &type, &msglen)))
  64                error("Empty notes tree. %s", notes_ref);
  65        else if (!msglen || type != OBJ_BLOB) {
  66                error("Note contains unusable content. "
  67                        "Is something else using this notes tree? %s", notes_ref);
  68                free(msg);
  69                msg = NULL;
  70        }
  71        free_notes(NULL);
  72        return msg;
  73}
  74
  75static int parse_rev_note(const char *msg, struct rev_note *res)
  76{
  77        const char *key, *value, *end;
  78        size_t len;
  79
  80        while (*msg) {
  81                end = strchr(msg, '\n');
  82                len = end ? end - msg : strlen(msg);
  83
  84                key = "Revision-number: ";
  85                if (!prefixcmp(msg, key)) {
  86                        long i;
  87                        char *end;
  88                        value = msg + strlen(key);
  89                        i = strtol(value, &end, 0);
  90                        if (end == value || i < 0 || i > UINT32_MAX)
  91                                return -1;
  92                        res->rev_nr = i;
  93                        return 0;
  94                }
  95                msg += len + 1;
  96        }
  97        /* didn't find it */
  98        return -1;
  99}
 100
 101static int note2mark_cb(const unsigned char *object_sha1,
 102                const unsigned char *note_sha1, char *note_path,
 103                void *cb_data)
 104{
 105        FILE *file = (FILE *)cb_data;
 106        char *msg;
 107        unsigned long msglen;
 108        enum object_type type;
 109        struct rev_note note;
 110
 111        if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) ||
 112                        !msglen || type != OBJ_BLOB) {
 113                free(msg);
 114                return 1;
 115        }
 116        if (parse_rev_note(msg, &note))
 117                return 2;
 118        if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
 119                return 3;
 120        return 0;
 121}
 122
 123static void regenerate_marks(void)
 124{
 125        int ret;
 126        FILE *marksfile = fopen(marksfilename, "w+");
 127
 128        if (!marksfile)
 129                die_errno("Couldn't create mark file %s.", marksfilename);
 130        ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
 131        if (ret)
 132                die("Regeneration of marks failed, returned %d.", ret);
 133        fclose(marksfile);
 134}
 135
 136static void check_or_regenerate_marks(int latestrev)
 137{
 138        FILE *marksfile;
 139        struct strbuf sb = STRBUF_INIT;
 140        struct strbuf line = STRBUF_INIT;
 141        int found = 0;
 142
 143        if (latestrev < 1)
 144                return;
 145
 146        init_notes(NULL, notes_ref, NULL, 0);
 147        marksfile = fopen(marksfilename, "r");
 148        if (!marksfile) {
 149                regenerate_marks();
 150                marksfile = fopen(marksfilename, "r");
 151                if (!marksfile)
 152                        die_errno("cannot read marks file %s!", marksfilename);
 153                fclose(marksfile);
 154        } else {
 155                strbuf_addf(&sb, ":%d ", latestrev);
 156                while (strbuf_getline(&line, marksfile, '\n') != EOF) {
 157                        if (!prefixcmp(line.buf, sb.buf)) {
 158                                found++;
 159                                break;
 160                        }
 161                }
 162                fclose(marksfile);
 163                if (!found)
 164                        regenerate_marks();
 165        }
 166        free_notes(NULL);
 167        strbuf_release(&sb);
 168        strbuf_release(&line);
 169}
 170
 171static int cmd_import(const char *line)
 172{
 173        int code;
 174        int dumpin_fd;
 175        char *note_msg;
 176        unsigned char head_sha1[20];
 177        unsigned int startrev;
 178        struct argv_array svndump_argv = ARGV_ARRAY_INIT;
 179        struct child_process svndump_proc;
 180
 181        if (read_ref(private_ref, head_sha1))
 182                startrev = 0;
 183        else {
 184                note_msg = read_ref_note(head_sha1);
 185                if(note_msg == NULL) {
 186                        warning("No note found for %s.", private_ref);
 187                        startrev = 0;
 188                } else {
 189                        struct rev_note note = { 0 };
 190                        if (parse_rev_note(note_msg, &note))
 191                                die("Revision number couldn't be parsed from note.");
 192                        startrev = note.rev_nr + 1;
 193                        free(note_msg);
 194                }
 195        }
 196        check_or_regenerate_marks(startrev - 1);
 197
 198        if (dump_from_file) {
 199                dumpin_fd = open(url, O_RDONLY);
 200                if(dumpin_fd < 0)
 201                        die_errno("Couldn't open svn dump file %s.", url);
 202        } else {
 203                memset(&svndump_proc, 0, sizeof(struct child_process));
 204                svndump_proc.out = -1;
 205                argv_array_push(&svndump_argv, "svnrdump");
 206                argv_array_push(&svndump_argv, "dump");
 207                argv_array_push(&svndump_argv, url);
 208                argv_array_pushf(&svndump_argv, "-r%u:HEAD", startrev);
 209                svndump_proc.argv = svndump_argv.argv;
 210
 211                code = start_command(&svndump_proc);
 212                if (code)
 213                        die("Unable to start %s, code %d", svndump_proc.argv[0], code);
 214                dumpin_fd = svndump_proc.out;
 215        }
 216        /* setup marks file import/export */
 217        printf("feature import-marks-if-exists=%s\n"
 218                        "feature export-marks=%s\n", marksfilename, marksfilename);
 219
 220        svndump_init_fd(dumpin_fd, STDIN_FILENO);
 221        svndump_read(url, private_ref, notes_ref);
 222        svndump_deinit();
 223        svndump_reset();
 224
 225        close(dumpin_fd);
 226        if (!dump_from_file) {
 227                code = finish_command(&svndump_proc);
 228                if (code)
 229                        warning("%s, returned %d", svndump_proc.argv[0], code);
 230                argv_array_clear(&svndump_argv);
 231        }
 232
 233        return 0;
 234}
 235
 236static int cmd_list(const char *line)
 237{
 238        printf("? %s\n\n", remote_ref);
 239        fflush(stdout);
 240        return 0;
 241}
 242
 243static int do_command(struct strbuf *line)
 244{
 245        const struct input_command_entry *p = input_command_list;
 246        static struct string_list batchlines = STRING_LIST_INIT_DUP;
 247        static const struct input_command_entry *batch_cmd;
 248        /*
 249         * commands can be grouped together in a batch.
 250         * Batches are ended by \n. If no batch is active the program ends.
 251         * During a batch all lines are buffered and passed to the handler function
 252         * when the batch is terminated.
 253         */
 254        if (line->len == 0) {
 255                if (batch_cmd) {
 256                        struct string_list_item *item;
 257                        for_each_string_list_item(item, &batchlines)
 258                                batch_cmd->fn(item->string);
 259                        terminate_batch();
 260                        batch_cmd = NULL;
 261                        string_list_clear(&batchlines, 0);
 262                        return 0;       /* end of the batch, continue reading other commands. */
 263                }
 264                return 1;       /* end of command stream, quit */
 265        }
 266        if (batch_cmd) {
 267                if (prefixcmp(batch_cmd->name, line->buf))
 268                        die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
 269                /* buffer batch lines */
 270                string_list_append(&batchlines, line->buf);
 271                return 0;
 272        }
 273
 274        for (p = input_command_list; p->name; p++) {
 275                if (!prefixcmp(line->buf, p->name) && (strlen(p->name) == line->len ||
 276                                line->buf[strlen(p->name)] == ' ')) {
 277                        if (p->batchable) {
 278                                batch_cmd = p;
 279                                string_list_append(&batchlines, line->buf);
 280                                return 0;
 281                        }
 282                        return p->fn(line->buf);
 283                }
 284        }
 285        die("Unknown command '%s'\n", line->buf);
 286        return 0;
 287}
 288
 289int main(int argc, const char **argv)
 290{
 291        struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
 292                        private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
 293                        notes_ref_sb = STRBUF_INIT;
 294        static struct remote *remote;
 295        const char *url_in;
 296
 297        git_extract_argv0_path(argv[0]);
 298        setup_git_directory();
 299        if (argc < 2 || argc > 3) {
 300                usage("git-remote-svn <remote-name> [<url>]");
 301                return 1;
 302        }
 303
 304        remote = remote_get(argv[1]);
 305        url_in = (argc == 3) ? argv[2] : remote->url[0];
 306
 307        if (!prefixcmp(url_in, "file://")) {
 308                dump_from_file = 1;
 309                url = url_decode(url_in + sizeof("file://")-1);
 310        } else {
 311                dump_from_file = 0;
 312                end_url_with_slash(&url_sb, url_in);
 313                url = url_sb.buf;
 314        }
 315
 316        strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
 317        private_ref = private_ref_sb.buf;
 318
 319        strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
 320        notes_ref = notes_ref_sb.buf;
 321
 322        strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
 323                get_git_dir(), remote->name);
 324        marksfilename = marksfilename_sb.buf;
 325
 326        while (1) {
 327                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 328                        if (ferror(stdin))
 329                                die("Error reading command stream");
 330                        else
 331                                die("Unexpected end of command stream");
 332                }
 333                if (do_command(&buf))
 334                        break;
 335                strbuf_reset(&buf);
 336        }
 337
 338        strbuf_release(&buf);
 339        strbuf_release(&url_sb);
 340        strbuf_release(&private_ref_sb);
 341        strbuf_release(&notes_ref_sb);
 342        strbuf_release(&marksfilename_sb);
 343        return 0;
 344}