Andrew's git - gitweb.git/blob

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