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 /*
  17  * Compare start of string to literal of equal length;
  18  * must be guarded by length test.
  19  */
  20 #define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
  21
  22 #define REPORT_FILENO 3
  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                                 struct strbuf *val,
  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_swap(&rev_ctx.log, val);
 104                 break;
 105         case sizeof("svn:author"):
 106                 if (constcmp(key, "svn:author"))
 107                         break;
 108                 if (!val)
 109                         strbuf_reset(&rev_ctx.author);
 110                 else
 111                         strbuf_swap(&rev_ctx.author, val);
 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->buf, &rev_ctx.timestamp, NULL))
 119                         warning("invalid timestamp: %s", val->buf);
 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         static struct strbuf val = STRBUF_INIT;
 156         const char *t;
 157         /*
 158          * NEEDSWORK: to support simple mode changes like
 159          *      K 11
 160          *      svn:special
 161          *      V 1
 162          *      *
 163          *      D 14
 164          *      svn:executable
 165          * we keep track of whether a mode has been set and reset to
 166          * plain file only if not.  We should be keeping track of the
 167          * symlink and executable bits separately instead.
 168          */
 169         uint32_t type_set = 0;
 170         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
 171                 uint32_t len;
 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                 strbuf_reset(&val);
 179                 buffer_read_binary(&input, &val, len);
 180                 if (val.len < len)
 181                         die_short_read();
 182
 183                 /* Discard trailing newline. */
 184                 ch = buffer_read_char(&input);
 185                 if (ch == EOF)
 186                         die_short_read();
 187                 if (ch != '\n')
 188                         die("invalid dump: expected newline after %s", val.buf);
 189
 190                 switch (type) {
 191                 case 'K':
 192                         strbuf_swap(&key, &val);
 193                         continue;
 194                 case 'D':
 195                         handle_property(&val, NULL, &type_set);
 196                         continue;
 197                 case 'V':
 198                         handle_property(&key, &val, &type_set);
 199                         strbuf_reset(&key);
 200                         continue;
 201                 default:
 202                         die("invalid property line: %s\n", t);
 203                 }
 204         }
 205 }
 206
 207 static void handle_node(void)
 208 {
 209         const uint32_t type = node_ctx.type;
 210         const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
 211         const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
 212         /*
 213          * Old text for this node:
 214          *  NULL        - directory or bug
 215          *  empty_blob  - empty
 216          *  "<dataref>" - data retrievable from fast-import
 217          */
 218         static const char *const empty_blob = "::empty::";
 219         const char *old_data = NULL;
 220
 221         if (node_ctx.text_delta)
 222                 die("text deltas not supported");
 223
 224         if (node_ctx.action == NODEACT_DELETE) {
 225                 if (have_text || have_props || node_ctx.srcRev)
 226                         die("invalid dump: deletion node has "
 227                                 "copyfrom info, text, or properties");
 228                 repo_delete(node_ctx.dst.buf);
 229                 return;
 230         }
 231         if (node_ctx.action == NODEACT_REPLACE) {
 232                 repo_delete(node_ctx.dst.buf);
 233                 node_ctx.action = NODEACT_ADD;
 234         }
 235         if (node_ctx.srcRev) {
 236                 repo_copy(node_ctx.srcRev, node_ctx.src.buf, node_ctx.dst.buf);
 237                 if (node_ctx.action == NODEACT_ADD)
 238                         node_ctx.action = NODEACT_CHANGE;
 239         }
 240         if (have_text && type == REPO_MODE_DIR)
 241                 die("invalid dump: directories cannot have text attached");
 242
 243         /*
 244          * Find old content (old_data) and decide on the new mode.
 245          */
 246         if (node_ctx.action == NODEACT_CHANGE && !*node_ctx.dst.buf) {
 247                 if (type != REPO_MODE_DIR)
 248                         die("invalid dump: root of tree is not a regular file");
 249                 old_data = NULL;
 250         } else if (node_ctx.action == NODEACT_CHANGE) {
 251                 uint32_t mode;
 252                 old_data = repo_read_path(node_ctx.dst.buf, &mode);
 253                 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
 254                         die("invalid dump: cannot modify a directory into a file");
 255                 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
 256                         die("invalid dump: cannot modify a file into a directory");
 257                 node_ctx.type = mode;
 258         } else if (node_ctx.action == NODEACT_ADD) {
 259                 if (type == REPO_MODE_DIR)
 260                         old_data = NULL;
 261                 else if (have_text)
 262                         old_data = empty_blob;
 263                 else
 264                         die("invalid dump: adds node without text");
 265         } else {
 266                 die("invalid dump: Node-path block lacks Node-action");
 267         }
 268
 269         /*
 270          * Adjust mode to reflect properties.
 271          */
 272         if (have_props) {
 273                 if (!node_ctx.prop_delta)
 274                         node_ctx.type = type;
 275                 if (node_ctx.propLength)
 276                         read_props();
 277         }
 278
 279         /*
 280          * Save the result.
 281          */
 282         if (type == REPO_MODE_DIR)      /* directories are not tracked. */
 283                 return;
 284         assert(old_data);
 285         if (old_data == empty_blob)
 286                 /* For the fast_export_* functions, NULL means empty. */
 287                 old_data = NULL;
 288         if (!have_text) {
 289                 fast_export_modify(node_ctx.dst.buf, node_ctx.type, old_data);
 290                 return;
 291         }
 292         fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
 293         fast_export_data(node_ctx.type, node_ctx.textLength, &input);
 294 }
 295
 296 static void begin_revision(void)
 297 {
 298         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
 299                 return;
 300         fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
 301                 &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
 302                 rev_ctx.timestamp);
 303 }
 304
 305 static void end_revision(void)
 306 {
 307         if (rev_ctx.revision)
 308                 fast_export_end_commit(rev_ctx.revision);
 309 }
 310
 311 void svndump_read(const char *url)
 312 {
 313         char *val;
 314         char *t;
 315         uint32_t active_ctx = DUMP_CTX;
 316         uint32_t len;
 317
 318         reset_dump_ctx(url);
 319         while ((t = buffer_read_line(&input))) {
 320                 val = strchr(t, ':');
 321                 if (!val)
 322                         continue;
 323                 val++;
 324                 if (*val != ' ')
 325                         continue;
 326                 val++;
 327
 328                 /* strlen(key) + 1 */
 329                 switch (val - t - 1) {
 330                 case sizeof("SVN-fs-dump-format-version"):
 331                         if (constcmp(t, "SVN-fs-dump-format-version"))
 332                                 continue;
 333                         dump_ctx.version = atoi(val);
 334                         if (dump_ctx.version > 3)
 335                                 die("expected svn dump format version <= 3, found %"PRIu32,
 336                                     dump_ctx.version);
 337                         break;
 338                 case sizeof("UUID"):
 339                         if (constcmp(t, "UUID"))
 340                                 continue;
 341                         strbuf_reset(&dump_ctx.uuid);
 342                         strbuf_addstr(&dump_ctx.uuid, val);
 343                         break;
 344                 case sizeof("Revision-number"):
 345                         if (constcmp(t, "Revision-number"))
 346                                 continue;
 347                         if (active_ctx == NODE_CTX)
 348                                 handle_node();
 349                         if (active_ctx == REV_CTX)
 350                                 begin_revision();
 351                         if (active_ctx != DUMP_CTX)
 352                                 end_revision();
 353                         active_ctx = REV_CTX;
 354                         reset_rev_ctx(atoi(val));
 355                         break;
 356                 case sizeof("Node-path"):
 357                         if (prefixcmp(t, "Node-"))
 358                                 continue;
 359                         if (!constcmp(t + strlen("Node-"), "path")) {
 360                                 if (active_ctx == NODE_CTX)
 361                                         handle_node();
 362                                 if (active_ctx == REV_CTX)
 363                                         begin_revision();
 364                                 active_ctx = NODE_CTX;
 365                                 reset_node_ctx(val);
 366                                 break;
 367                         }
 368                         if (constcmp(t + strlen("Node-"), "kind"))
 369                                 continue;
 370                         if (!strcmp(val, "dir"))
 371                                 node_ctx.type = REPO_MODE_DIR;
 372                         else if (!strcmp(val, "file"))
 373                                 node_ctx.type = REPO_MODE_BLB;
 374                         else
 375                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 376                         break;
 377                 case sizeof("Node-action"):
 378                         if (constcmp(t, "Node-action"))
 379                                 continue;
 380                         if (!strcmp(val, "delete")) {
 381                                 node_ctx.action = NODEACT_DELETE;
 382                         } else if (!strcmp(val, "add")) {
 383                                 node_ctx.action = NODEACT_ADD;
 384                         } else if (!strcmp(val, "change")) {
 385                                 node_ctx.action = NODEACT_CHANGE;
 386                         } else if (!strcmp(val, "replace")) {
 387                                 node_ctx.action = NODEACT_REPLACE;
 388                         } else {
 389                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 390                                 node_ctx.action = NODEACT_UNKNOWN;
 391                         }
 392                         break;
 393                 case sizeof("Node-copyfrom-path"):
 394                         if (constcmp(t, "Node-copyfrom-path"))
 395                                 continue;
 396                         strbuf_reset(&node_ctx.src);
 397                         strbuf_addstr(&node_ctx.src, val);
 398                         break;
 399                 case sizeof("Node-copyfrom-rev"):
 400                         if (constcmp(t, "Node-copyfrom-rev"))
 401                                 continue;
 402                         node_ctx.srcRev = atoi(val);
 403                         break;
 404                 case sizeof("Text-content-length"):
 405                         if (!constcmp(t, "Text-content-length")) {
 406                                 node_ctx.textLength = atoi(val);
 407                                 break;
 408                         }
 409                         if (constcmp(t, "Prop-content-length"))
 410                                 continue;
 411                         node_ctx.propLength = atoi(val);
 412                         break;
 413                 case sizeof("Text-delta"):
 414                         if (!constcmp(t, "Text-delta")) {
 415                                 node_ctx.text_delta = !strcmp(val, "true");
 416                                 break;
 417                         }
 418                         if (constcmp(t, "Prop-delta"))
 419                                 continue;
 420                         node_ctx.prop_delta = !strcmp(val, "true");
 421                         break;
 422                 case sizeof("Content-length"):
 423                         if (constcmp(t, "Content-length"))
 424                                 continue;
 425                         len = atoi(val);
 426                         t = buffer_read_line(&input);
 427                         if (!t)
 428                                 die_short_read();
 429                         if (*t)
 430                                 die("invalid dump: expected blank line after content length header");
 431                         if (active_ctx == REV_CTX) {
 432                                 read_props();
 433                         } else if (active_ctx == NODE_CTX) {
 434                                 handle_node();
 435                                 active_ctx = INTERNODE_CTX;
 436                         } else {
 437                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 438                                 if (buffer_skip_bytes(&input, len) != len)
 439                                         die_short_read();
 440                         }
 441                 }
 442         }
 443         if (buffer_ferror(&input))
 444                 die_short_read();
 445         if (active_ctx == NODE_CTX)
 446                 handle_node();
 447         if (active_ctx == REV_CTX)
 448                 begin_revision();
 449         if (active_ctx != DUMP_CTX)
 450                 end_revision();
 451 }
 452
 453 int svndump_init(const char *filename)
 454 {
 455         if (buffer_init(&input, filename))
 456                 return error("cannot open %s: %s", filename, strerror(errno));
 457         fast_export_init(REPORT_FILENO);
 458         strbuf_init(&dump_ctx.uuid, 4096);
 459         strbuf_init(&dump_ctx.url, 4096);
 460         strbuf_init(&rev_ctx.log, 4096);
 461         strbuf_init(&rev_ctx.author, 4096);
 462         strbuf_init(&node_ctx.src, 4096);
 463         strbuf_init(&node_ctx.dst, 4096);
 464         reset_dump_ctx(NULL);
 465         reset_rev_ctx(0);
 466         reset_node_ctx(NULL);
 467         return 0;
 468 }
 469
 470 void svndump_deinit(void)
 471 {
 472         fast_export_deinit();
 473         reset_dump_ctx(NULL);
 474         reset_rev_ctx(0);
 475         reset_node_ctx(NULL);
 476         strbuf_release(&rev_ctx.log);
 477         strbuf_release(&node_ctx.src);
 478         strbuf_release(&node_ctx.dst);
 479         if (buffer_deinit(&input))
 480                 fprintf(stderr, "Input error\n");
 481         if (ferror(stdout))
 482                 fprintf(stderr, "Output error\n");
 483 }
 484
 485 void svndump_reset(void)
 486 {
 487         fast_export_reset();
 488         buffer_reset(&input);
 489         strbuf_release(&dump_ctx.uuid);
 490         strbuf_release(&dump_ctx.url);
 491         strbuf_release(&rev_ctx.log);
 492         strbuf_release(&rev_ctx.author);
 493 }