git.oblomov.eu Git - git/blob - vcs-svn/svndump.c

   1 /*
   2  * Parse and rearrange a svnadmin dump.
   3  * Create the dump with:
   4  * svnadmin dump --incremental -r<startrev>:<endrev> <repository> >outfile
   5  *
   6  * Licensed under a two-clause BSD-style license.
   7  * See LICENSE for details.
   8  */
   9
  10 #include "cache.h"
  11 #include "repo_tree.h"
  12 #include "fast_export.h"
  13 #include "line_buffer.h"
  14 #include "strbuf.h"
  15
  16 #define REPORT_FILENO 3
  17
  18 /*
  19  * Compare start of string to literal of equal length;
  20  * must be guarded by length test.
  21  */
  22 #define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
  23
  24 #define NODEACT_REPLACE 4
  25 #define NODEACT_DELETE 3
  26 #define NODEACT_ADD 2
  27 #define NODEACT_CHANGE 1
  28 #define NODEACT_UNKNOWN 0
  29
  30 /* States: */
  31 #define DUMP_CTX 0      /* dump metadata */
  32 #define REV_CTX  1      /* revision metadata */
  33 #define NODE_CTX 2      /* node metadata */
  34 #define INTERNODE_CTX 3 /* between nodes */
  35
  36 #define LENGTH_UNKNOWN (~0)
  37 #define DATE_RFC2822_LEN 31
  38
  39 static struct line_buffer input = LINE_BUFFER_INIT;
  40
  41 static struct {
  42         uint32_t action, propLength, textLength, srcRev, type;
  43         struct strbuf src, dst;
  44         uint32_t text_delta, prop_delta;
  45 } node_ctx;
  46
  47 static struct {
  48         uint32_t revision;
  49         unsigned long timestamp;
  50         struct strbuf log, author;
  51 } rev_ctx;
  52
  53 static struct {
  54         uint32_t version;
  55         struct strbuf uuid, url;
  56 } dump_ctx;
  57
  58 static void reset_node_ctx(char *fname)
  59 {
  60         node_ctx.type = 0;
  61         node_ctx.action = NODEACT_UNKNOWN;
  62         node_ctx.propLength = LENGTH_UNKNOWN;
  63         node_ctx.textLength = LENGTH_UNKNOWN;
  64         strbuf_reset(&node_ctx.src);
  65         node_ctx.srcRev = 0;
  66         strbuf_reset(&node_ctx.dst);
  67         if (fname)
  68                 strbuf_addstr(&node_ctx.dst, fname);
  69         node_ctx.text_delta = 0;
  70         node_ctx.prop_delta = 0;
  71 }
  72
  73 static void reset_rev_ctx(uint32_t revision)
  74 {
  75         rev_ctx.revision = revision;
  76         rev_ctx.timestamp = 0;
  77         strbuf_reset(&rev_ctx.log);
  78         strbuf_reset(&rev_ctx.author);
  79 }
  80
  81 static void reset_dump_ctx(const char *url)
  82 {
  83         strbuf_reset(&dump_ctx.url);
  84         if (url)
  85                 strbuf_addstr(&dump_ctx.url, url);
  86         dump_ctx.version = 1;
  87         strbuf_reset(&dump_ctx.uuid);
  88 }
  89
  90 static void handle_property(const struct strbuf *key_buf,
  91                                 const char *val, uint32_t len,
  92                                 uint32_t *type_set)
  93 {
  94         const char *key = key_buf->buf;
  95         size_t keylen = key_buf->len;
  96
  97         switch (keylen + 1) {
  98         case sizeof("svn:log"):
  99                 if (constcmp(key, "svn:log"))
 100                         break;
 101                 if (!val)
 102                         die("invalid dump: unsets svn:log");
 103                 strbuf_reset(&rev_ctx.log);
 104                 strbuf_add(&rev_ctx.log, val, len);
 105                 break;
 106         case sizeof("svn:author"):
 107                 if (constcmp(key, "svn:author"))
 108                         break;
 109                 strbuf_reset(&rev_ctx.author);
 110                 if (val)
 111                         strbuf_add(&rev_ctx.author, val, len);
 112                 break;
 113         case sizeof("svn:date"):
 114                 if (constcmp(key, "svn:date"))
 115                         break;
 116                 if (!val)
 117                         die("invalid dump: unsets svn:date");
 118                 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
 119                         warning("invalid timestamp: %s", val);
 120                 break;
 121         case sizeof("svn:executable"):
 122         case sizeof("svn:special"):
 123                 if (keylen == strlen("svn:executable") &&
 124                     constcmp(key, "svn:executable"))
 125                         break;
 126                 if (keylen == strlen("svn:special") &&
 127                     constcmp(key, "svn:special"))
 128                         break;
 129                 if (*type_set) {
 130                         if (!val)
 131                                 return;
 132                         die("invalid dump: sets type twice");
 133                 }
 134                 if (!val) {
 135                         node_ctx.type = REPO_MODE_BLB;
 136                         return;
 137                 }
 138                 *type_set = 1;
 139                 node_ctx.type = keylen == strlen("svn:executable") ?
 140                                 REPO_MODE_EXE :
 141                                 REPO_MODE_LNK;
 142         }
 143 }
 144
 145 static void die_short_read(void)
 146 {
 147         if (buffer_ferror(&input))
 148                 die_errno("error reading dump file");
 149         die("invalid dump: unexpected end of file");
 150 }
 151
 152 static void read_props(void)
 153 {
 154         static struct strbuf key = STRBUF_INIT;
 155         const char *t;
 156         /*
 157          * NEEDSWORK: to support simple mode changes like
 158          *      K 11
 159          *      svn:special
 160          *      V 1
 161          *      *
 162          *      D 14
 163          *      svn:executable
 164          * we keep track of whether a mode has been set and reset to
 165          * plain file only if not.  We should be keeping track of the
 166          * symlink and executable bits separately instead.
 167          */
 168         uint32_t type_set = 0;
 169         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
 170                 uint32_t len;
 171                 const char *val;
 172                 const char type = t[0];
 173                 int ch;
 174
 175                 if (!type || t[1] != ' ')
 176                         die("invalid property line: %s\n", t);
 177                 len = atoi(&t[2]);
 178                 val = buffer_read_string(&input, len);
 179                 if (!val || strlen(val) != len)
 180                         die_short_read();
 181
 182                 /* Discard trailing newline. */
 183                 ch = buffer_read_char(&input);
 184                 if (ch == EOF)
 185                         die_short_read();
 186                 if (ch != '\n')
 187                         die("invalid dump: expected newline after %s", val);
 188
 189                 switch (type) {
 190                 case 'K':
 191                 case 'D':
 192                         strbuf_reset(&key);
 193                         if (val)
 194                                 strbuf_add(&key, val, len);
 195                         if (type == 'K')
 196                                 continue;
 197                         assert(type == 'D');
 198                         val = NULL;
 199                         len = 0;
 200                         /* fall through */
 201                 case 'V':
 202                         handle_property(&key, val, len, &type_set);
 203                         strbuf_reset(&key);
 204                         continue;
 205                 default:
 206                         die("invalid property line: %s\n", t);
 207                 }
 208         }
 209 }
 210
 211 static void handle_node(void)
 212 {
 213         const uint32_t type = node_ctx.type;
 214         const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
 215         const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
 216         /*
 217          * Old text for this node:
 218          *  NULL        - directory or bug
 219          *  empty_blob  - empty
 220          *  "<dataref>" - data retrievable from fast-import
 221          */
 222         static const char *const empty_blob = "::empty::";
 223         const char *old_data = NULL;
 224
 225         if (node_ctx.text_delta)
 226                 die("text deltas not supported");
 227
 228         if (node_ctx.action == NODEACT_DELETE) {
 229                 if (have_text || have_props || node_ctx.srcRev)
 230                         die("invalid dump: deletion node has "
 231                                 "copyfrom info, text, or properties");
 232                 return repo_delete(node_ctx.dst.buf);
 233         }
 234         if (node_ctx.action == NODEACT_REPLACE) {
 235                 repo_delete(node_ctx.dst.buf);
 236                 node_ctx.action = NODEACT_ADD;
 237         }
 238         if (node_ctx.srcRev) {
 239                 repo_copy(node_ctx.srcRev, node_ctx.src.buf, node_ctx.dst.buf);
 240                 if (node_ctx.action == NODEACT_ADD)
 241                         node_ctx.action = NODEACT_CHANGE;
 242         }
 243         if (have_text && type == REPO_MODE_DIR)
 244                 die("invalid dump: directories cannot have text attached");
 245
 246         /*
 247          * Find old content (old_data) and decide on the new mode.
 248          */
 249         if (node_ctx.action == NODEACT_CHANGE && !*node_ctx.dst.buf) {
 250                 if (type != REPO_MODE_DIR)
 251                         die("invalid dump: root of tree is not a regular file");
 252                 old_data = NULL;
 253         } else if (node_ctx.action == NODEACT_CHANGE) {
 254                 uint32_t mode;
 255                 old_data = repo_read_path(node_ctx.dst.buf);
 256                 mode = repo_read_mode(node_ctx.dst.buf);
 257                 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
 258                         die("invalid dump: cannot modify a directory into a file");
 259                 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
 260                         die("invalid dump: cannot modify a file into a directory");
 261                 node_ctx.type = mode;
 262         } else if (node_ctx.action == NODEACT_ADD) {
 263                 if (type == REPO_MODE_DIR)
 264                         old_data = NULL;
 265                 else if (have_text)
 266                         old_data = empty_blob;
 267                 else
 268                         die("invalid dump: adds node without text");
 269         } else {
 270                 die("invalid dump: Node-path block lacks Node-action");
 271         }
 272
 273         /*
 274          * Adjust mode to reflect properties.
 275          */
 276         if (have_props) {
 277                 if (!node_ctx.prop_delta)
 278                         node_ctx.type = type;
 279                 if (node_ctx.propLength)
 280                         read_props();
 281         }
 282
 283         /*
 284          * Save the result.
 285          */
 286         if (type == REPO_MODE_DIR)      /* directories are not tracked. */
 287                 return;
 288         assert(old_data);
 289         if (old_data == empty_blob)
 290                 /* For the fast_export_* functions, NULL means empty. */
 291                 old_data = NULL;
 292         if (!have_text) {
 293                 fast_export_modify(node_ctx.dst.buf, node_ctx.type, old_data);
 294                 return;
 295         }
 296         fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
 297         fast_export_data(node_ctx.type, node_ctx.textLength, &input);
 298 }
 299
 300 static void begin_revision(void)
 301 {
 302         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
 303                 return;
 304         fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
 305                 rev_ctx.log.buf, dump_ctx.uuid.buf, dump_ctx.url.buf,
 306                 rev_ctx.timestamp);
 307 }
 308
 309 static void end_revision(void)
 310 {
 311         if (rev_ctx.revision)
 312                 fast_export_end_commit(rev_ctx.revision);
 313 }
 314
 315 void svndump_read(const char *url)
 316 {
 317         char *val;
 318         char *t;
 319         uint32_t active_ctx = DUMP_CTX;
 320         uint32_t len;
 321
 322         reset_dump_ctx(url);
 323         while ((t = buffer_read_line(&input))) {
 324                 val = strstr(t, ": ");
 325                 if (!val)
 326                         continue;
 327                 val += 2;
 328
 329                 /* strlen(key) + 1 */
 330                 switch (val - t - 1) {
 331                 case sizeof("SVN-fs-dump-format-version"):
 332                         if (constcmp(t, "SVN-fs-dump-format-version"))
 333                                 continue;
 334                         dump_ctx.version = atoi(val);
 335                         if (dump_ctx.version > 3)
 336                                 die("expected svn dump format version <= 3, found %"PRIu32,
 337                                     dump_ctx.version);
 338                         break;
 339                 case sizeof("UUID"):
 340                         if (constcmp(t, "UUID"))
 341                                 continue;
 342                         strbuf_reset(&dump_ctx.uuid);
 343                         strbuf_addstr(&dump_ctx.uuid, val);
 344                         break;
 345                 case sizeof("Revision-number"):
 346                         if (constcmp(t, "Revision-number"))
 347                                 continue;
 348                         if (active_ctx == NODE_CTX)
 349                                 handle_node();
 350                         if (active_ctx == REV_CTX)
 351                                 begin_revision();
 352                         if (active_ctx != DUMP_CTX)
 353                                 end_revision();
 354                         active_ctx = REV_CTX;
 355                         reset_rev_ctx(atoi(val));
 356                         break;
 357                 case sizeof("Node-path"):
 358                         if (prefixcmp(t, "Node-"))
 359                                 continue;
 360                         if (!constcmp(t + strlen("Node-"), "path")) {
 361                                 if (active_ctx == NODE_CTX)
 362                                         handle_node();
 363                                 if (active_ctx == REV_CTX)
 364                                         begin_revision();
 365                                 active_ctx = NODE_CTX;
 366                                 reset_node_ctx(val);
 367                                 break;
 368                         }
 369                         if (constcmp(t + strlen("Node-"), "kind"))
 370                                 continue;
 371                         if (!strcmp(val, "dir"))
 372                                 node_ctx.type = REPO_MODE_DIR;
 373                         else if (!strcmp(val, "file"))
 374                                 node_ctx.type = REPO_MODE_BLB;
 375                         else
 376                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 377                         break;
 378                 case sizeof("Node-action"):
 379                         if (constcmp(t, "Node-action"))
 380                                 continue;
 381                         if (!strcmp(val, "delete")) {
 382                                 node_ctx.action = NODEACT_DELETE;
 383                         } else if (!strcmp(val, "add")) {
 384                                 node_ctx.action = NODEACT_ADD;
 385                         } else if (!strcmp(val, "change")) {
 386                                 node_ctx.action = NODEACT_CHANGE;
 387                         } else if (!strcmp(val, "replace")) {
 388                                 node_ctx.action = NODEACT_REPLACE;
 389                         } else {
 390                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 391                                 node_ctx.action = NODEACT_UNKNOWN;
 392                         }
 393                         break;
 394                 case sizeof("Node-copyfrom-path"):
 395                         if (constcmp(t, "Node-copyfrom-path"))
 396                                 continue;
 397                         strbuf_reset(&node_ctx.src);
 398                         strbuf_addstr(&node_ctx.src, val);
 399                         break;
 400                 case sizeof("Node-copyfrom-rev"):
 401                         if (constcmp(t, "Node-copyfrom-rev"))
 402                                 continue;
 403                         node_ctx.srcRev = atoi(val);
 404                         break;
 405                 case sizeof("Text-content-length"):
 406                         if (!constcmp(t, "Text-content-length")) {
 407                                 node_ctx.textLength = atoi(val);
 408                                 break;
 409                         }
 410                         if (constcmp(t, "Prop-content-length"))
 411                                 continue;
 412                         node_ctx.propLength = atoi(val);
 413                         break;
 414                 case sizeof("Text-delta"):
 415                         if (!constcmp(t, "Text-delta")) {
 416                                 node_ctx.text_delta = !strcmp(val, "true");
 417                                 break;
 418                         }
 419                         if (constcmp(t, "Prop-delta"))
 420                                 continue;
 421                         node_ctx.prop_delta = !strcmp(val, "true");
 422                         break;
 423                 case sizeof("Content-length"):
 424                         if (constcmp(t, "Content-length"))
 425                                 continue;
 426                         len = atoi(val);
 427                         t = buffer_read_line(&input);
 428                         if (!t)
 429                                 die_short_read();
 430                         if (*t)
 431                                 die("invalid dump: expected blank line after content length header");
 432                         if (active_ctx == REV_CTX) {
 433                                 read_props();
 434                         } else if (active_ctx == NODE_CTX) {
 435                                 handle_node();
 436                                 active_ctx = INTERNODE_CTX;
 437                         } else {
 438                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 439                                 if (buffer_skip_bytes(&input, len) != len)
 440                                         die_short_read();
 441                         }
 442                 }
 443         }
 444         if (buffer_ferror(&input))
 445                 die_short_read();
 446         if (active_ctx == NODE_CTX)
 447                 handle_node();
 448         if (active_ctx == REV_CTX)
 449                 begin_revision();
 450         if (active_ctx != DUMP_CTX)
 451                 end_revision();
 452 }
 453
 454 int svndump_init(const char *filename)
 455 {
 456         if (buffer_init(&input, filename))
 457                 return error("cannot open %s: %s", filename, strerror(errno));
 458         fast_export_init(REPORT_FILENO);
 459         strbuf_init(&dump_ctx.uuid, 4096);
 460         strbuf_init(&dump_ctx.url, 4096);
 461         strbuf_init(&rev_ctx.log, 4096);
 462         strbuf_init(&rev_ctx.author, 4096);
 463         strbuf_init(&node_ctx.src, 4096);
 464         strbuf_init(&node_ctx.dst, 4096);
 465         reset_dump_ctx(NULL);
 466         reset_rev_ctx(0);
 467         reset_node_ctx(NULL);
 468         return 0;
 469 }
 470
 471 void svndump_deinit(void)
 472 {
 473         fast_export_deinit();
 474         reset_dump_ctx(NULL);
 475         reset_rev_ctx(0);
 476         reset_node_ctx(NULL);
 477         strbuf_release(&rev_ctx.log);
 478         strbuf_release(&node_ctx.src);
 479         strbuf_release(&node_ctx.dst);
 480         if (buffer_deinit(&input))
 481                 fprintf(stderr, "Input error\n");
 482         if (ferror(stdout))
 483                 fprintf(stderr, "Output error\n");
 484 }
 485
 486 void svndump_reset(void)
 487 {
 488         fast_export_reset();
 489         buffer_reset(&input);
 490         strbuf_release(&dump_ctx.uuid);
 491         strbuf_release(&dump_ctx.url);
 492         strbuf_release(&rev_ctx.log);
 493         strbuf_release(&rev_ctx.author);
 494 }