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 #include "svndump.h"
  16
  17 /*
  18  * Compare start of string to literal of equal length;
  19  * must be guarded by length test.
  20  */
  21 #define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
  22
  23 #define REPORT_FILENO 3
  24
  25 #define NODEACT_REPLACE 4
  26 #define NODEACT_DELETE 3
  27 #define NODEACT_ADD 2
  28 #define NODEACT_CHANGE 1
  29 #define NODEACT_UNKNOWN 0
  30
  31 /* States: */
  32 #define DUMP_CTX 0      /* dump metadata */
  33 #define REV_CTX  1      /* revision metadata */
  34 #define NODE_CTX 2      /* node metadata */
  35 #define INTERNODE_CTX 3 /* between nodes */
  36
  37 #define LENGTH_UNKNOWN (~0)
  38 #define DATE_RFC2822_LEN 31
  39
  40 static struct line_buffer input = LINE_BUFFER_INIT;
  41
  42 static struct {
  43         uint32_t action, propLength, textLength, srcRev, type;
  44         struct strbuf src, dst;
  45         uint32_t text_delta, prop_delta;
  46 } node_ctx;
  47
  48 static struct {
  49         uint32_t revision;
  50         unsigned long timestamp;
  51         struct strbuf log, author;
  52 } rev_ctx;
  53
  54 static struct {
  55         uint32_t version;
  56         struct strbuf uuid, url;
  57 } dump_ctx;
  58
  59 static void reset_node_ctx(char *fname)
  60 {
  61         node_ctx.type = 0;
  62         node_ctx.action = NODEACT_UNKNOWN;
  63         node_ctx.propLength = LENGTH_UNKNOWN;
  64         node_ctx.textLength = LENGTH_UNKNOWN;
  65         strbuf_reset(&node_ctx.src);
  66         node_ctx.srcRev = 0;
  67         strbuf_reset(&node_ctx.dst);
  68         if (fname)
  69                 strbuf_addstr(&node_ctx.dst, fname);
  70         node_ctx.text_delta = 0;
  71         node_ctx.prop_delta = 0;
  72 }
  73
  74 static void reset_rev_ctx(uint32_t revision)
  75 {
  76         rev_ctx.revision = revision;
  77         rev_ctx.timestamp = 0;
  78         strbuf_reset(&rev_ctx.log);
  79         strbuf_reset(&rev_ctx.author);
  80 }
  81
  82 static void reset_dump_ctx(const char *url)
  83 {
  84         strbuf_reset(&dump_ctx.url);
  85         if (url)
  86                 strbuf_addstr(&dump_ctx.url, url);
  87         dump_ctx.version = 1;
  88         strbuf_reset(&dump_ctx.uuid);
  89 }
  90
  91 static void handle_property(const struct strbuf *key_buf,
  92                                 struct strbuf *val,
  93                                 uint32_t *type_set)
  94 {
  95         const char *key = key_buf->buf;
  96         size_t keylen = key_buf->len;
  97
  98         switch (keylen + 1) {
  99         case sizeof("svn:log"):
 100                 if (constcmp(key, "svn:log"))
 101                         break;
 102                 if (!val)
 103                         die("invalid dump: unsets svn:log");
 104                 strbuf_swap(&rev_ctx.log, val);
 105                 break;
 106         case sizeof("svn:author"):
 107                 if (constcmp(key, "svn:author"))
 108                         break;
 109                 if (!val)
 110                         strbuf_reset(&rev_ctx.author);
 111                 else
 112                         strbuf_swap(&rev_ctx.author, val);
 113                 break;
 114         case sizeof("svn:date"):
 115                 if (constcmp(key, "svn:date"))
 116                         break;
 117                 if (!val)
 118                         die("invalid dump: unsets svn:date");
 119                 if (parse_date_basic(val->buf, &rev_ctx.timestamp, NULL))
 120                         warning("invalid timestamp: %s", val->buf);
 121                 break;
 122         case sizeof("svn:executable"):
 123         case sizeof("svn:special"):
 124                 if (keylen == strlen("svn:executable") &&
 125                     constcmp(key, "svn:executable"))
 126                         break;
 127                 if (keylen == strlen("svn:special") &&
 128                     constcmp(key, "svn:special"))
 129                         break;
 130                 if (*type_set) {
 131                         if (!val)
 132                                 return;
 133                         die("invalid dump: sets type twice");
 134                 }
 135                 if (!val) {
 136                         node_ctx.type = REPO_MODE_BLB;
 137                         return;
 138                 }
 139                 *type_set = 1;
 140                 node_ctx.type = keylen == strlen("svn:executable") ?
 141                                 REPO_MODE_EXE :
 142                                 REPO_MODE_LNK;
 143         }
 144 }
 145
 146 static void die_short_read(void)
 147 {
 148         if (buffer_ferror(&input))
 149                 die_errno("error reading dump file");
 150         die("invalid dump: unexpected end of file");
 151 }
 152
 153 static void read_props(void)
 154 {
 155         static struct strbuf key = STRBUF_INIT;
 156         static struct strbuf val = STRBUF_INIT;
 157         const char *t;
 158         /*
 159          * NEEDSWORK: to support simple mode changes like
 160          *      K 11
 161          *      svn:special
 162          *      V 1
 163          *      *
 164          *      D 14
 165          *      svn:executable
 166          * we keep track of whether a mode has been set and reset to
 167          * plain file only if not.  We should be keeping track of the
 168          * symlink and executable bits separately instead.
 169          */
 170         uint32_t type_set = 0;
 171         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
 172                 uint32_t len;
 173                 const char type = t[0];
 174                 int ch;
 175
 176                 if (!type || t[1] != ' ')
 177                         die("invalid property line: %s\n", t);
 178                 len = atoi(&t[2]);
 179                 strbuf_reset(&val);
 180                 buffer_read_binary(&input, &val, len);
 181                 if (val.len < len)
 182                         die_short_read();
 183
 184                 /* Discard trailing newline. */
 185                 ch = buffer_read_char(&input);
 186                 if (ch == EOF)
 187                         die_short_read();
 188                 if (ch != '\n')
 189                         die("invalid dump: expected newline after %s", val.buf);
 190
 191                 switch (type) {
 192                 case 'K':
 193                         strbuf_swap(&key, &val);
 194                         continue;
 195                 case 'D':
 196                         handle_property(&val, NULL, &type_set);
 197                         continue;
 198                 case 'V':
 199                         handle_property(&key, &val, &type_set);
 200                         strbuf_reset(&key);
 201                         continue;
 202                 default:
 203                         die("invalid property line: %s\n", t);
 204                 }
 205         }
 206 }
 207
 208 static void handle_node(void)
 209 {
 210         const uint32_t type = node_ctx.type;
 211         const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
 212         const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
 213         /*
 214          * Old text for this node:
 215          *  NULL        - directory or bug
 216          *  empty_blob  - empty
 217          *  "<dataref>" - data retrievable from fast-import
 218          */
 219         static const char *const empty_blob = "::empty::";
 220         const char *old_data = NULL;
 221         uint32_t old_mode = REPO_MODE_BLB;
 222
 223         if (node_ctx.action == NODEACT_DELETE) {
 224                 if (have_text || have_props || node_ctx.srcRev)
 225                         die("invalid dump: deletion node has "
 226                                 "copyfrom info, text, or properties");
 227                 repo_delete(node_ctx.dst.buf);
 228                 return;
 229         }
 230         if (node_ctx.action == NODEACT_REPLACE) {
 231                 repo_delete(node_ctx.dst.buf);
 232                 node_ctx.action = NODEACT_ADD;
 233         }
 234         if (node_ctx.srcRev) {
 235                 repo_copy(node_ctx.srcRev, node_ctx.src.buf, node_ctx.dst.buf);
 236                 if (node_ctx.action == NODEACT_ADD)
 237                         node_ctx.action = NODEACT_CHANGE;
 238         }
 239         if (have_text && type == REPO_MODE_DIR)
 240                 die("invalid dump: directories cannot have text attached");
 241
 242         /*
 243          * Find old content (old_data) and decide on the new mode.
 244          */
 245         if (node_ctx.action == NODEACT_CHANGE && !*node_ctx.dst.buf) {
 246                 if (type != REPO_MODE_DIR)
 247                         die("invalid dump: root of tree is not a regular file");
 248                 old_data = NULL;
 249         } else if (node_ctx.action == NODEACT_CHANGE) {
 250                 uint32_t mode;
 251                 old_data = repo_read_path(node_ctx.dst.buf, &mode);
 252                 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
 253                         die("invalid dump: cannot modify a directory into a file");
 254                 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
 255                         die("invalid dump: cannot modify a file into a directory");
 256                 node_ctx.type = mode;
 257                 old_mode = 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         if (!node_ctx.text_delta) {
 293                 fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
 294                 fast_export_data(node_ctx.type, node_ctx.textLength, &input);
 295                 return;
 296         }
 297         fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
 298         fast_export_blob_delta(node_ctx.type, old_mode, old_data,
 299                                 node_ctx.textLength, &input);
 300 }
 301
 302 static void begin_revision(void)
 303 {
 304         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
 305                 return;
 306         fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
 307                 &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
 308                 rev_ctx.timestamp);
 309 }
 310
 311 static void end_revision(void)
 312 {
 313         if (rev_ctx.revision)
 314                 fast_export_end_commit(rev_ctx.revision);
 315 }
 316
 317 void svndump_read(const char *url)
 318 {
 319         char *val;
 320         char *t;
 321         uint32_t active_ctx = DUMP_CTX;
 322         uint32_t len;
 323
 324         reset_dump_ctx(url);
 325         while ((t = buffer_read_line(&input))) {
 326                 val = strchr(t, ':');
 327                 if (!val)
 328                         continue;
 329                 val++;
 330                 if (*val != ' ')
 331                         continue;
 332                 val++;
 333
 334                 /* strlen(key) + 1 */
 335                 switch (val - t - 1) {
 336                 case sizeof("SVN-fs-dump-format-version"):
 337                         if (constcmp(t, "SVN-fs-dump-format-version"))
 338                                 continue;
 339                         dump_ctx.version = atoi(val);
 340                         if (dump_ctx.version > 3)
 341                                 die("expected svn dump format version <= 3, found %"PRIu32,
 342                                     dump_ctx.version);
 343                         break;
 344                 case sizeof("UUID"):
 345                         if (constcmp(t, "UUID"))
 346                                 continue;
 347                         strbuf_reset(&dump_ctx.uuid);
 348                         strbuf_addstr(&dump_ctx.uuid, val);
 349                         break;
 350                 case sizeof("Revision-number"):
 351                         if (constcmp(t, "Revision-number"))
 352                                 continue;
 353                         if (active_ctx == NODE_CTX)
 354                                 handle_node();
 355                         if (active_ctx == REV_CTX)
 356                                 begin_revision();
 357                         if (active_ctx != DUMP_CTX)
 358                                 end_revision();
 359                         active_ctx = REV_CTX;
 360                         reset_rev_ctx(atoi(val));
 361                         break;
 362                 case sizeof("Node-path"):
 363                         if (prefixcmp(t, "Node-"))
 364                                 continue;
 365                         if (!constcmp(t + strlen("Node-"), "path")) {
 366                                 if (active_ctx == NODE_CTX)
 367                                         handle_node();
 368                                 if (active_ctx == REV_CTX)
 369                                         begin_revision();
 370                                 active_ctx = NODE_CTX;
 371                                 reset_node_ctx(val);
 372                                 break;
 373                         }
 374                         if (constcmp(t + strlen("Node-"), "kind"))
 375                                 continue;
 376                         if (!strcmp(val, "dir"))
 377                                 node_ctx.type = REPO_MODE_DIR;
 378                         else if (!strcmp(val, "file"))
 379                                 node_ctx.type = REPO_MODE_BLB;
 380                         else
 381                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 382                         break;
 383                 case sizeof("Node-action"):
 384                         if (constcmp(t, "Node-action"))
 385                                 continue;
 386                         if (!strcmp(val, "delete")) {
 387                                 node_ctx.action = NODEACT_DELETE;
 388                         } else if (!strcmp(val, "add")) {
 389                                 node_ctx.action = NODEACT_ADD;
 390                         } else if (!strcmp(val, "change")) {
 391                                 node_ctx.action = NODEACT_CHANGE;
 392                         } else if (!strcmp(val, "replace")) {
 393                                 node_ctx.action = NODEACT_REPLACE;
 394                         } else {
 395                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 396                                 node_ctx.action = NODEACT_UNKNOWN;
 397                         }
 398                         break;
 399                 case sizeof("Node-copyfrom-path"):
 400                         if (constcmp(t, "Node-copyfrom-path"))
 401                                 continue;
 402                         strbuf_reset(&node_ctx.src);
 403                         strbuf_addstr(&node_ctx.src, val);
 404                         break;
 405                 case sizeof("Node-copyfrom-rev"):
 406                         if (constcmp(t, "Node-copyfrom-rev"))
 407                                 continue;
 408                         node_ctx.srcRev = atoi(val);
 409                         break;
 410                 case sizeof("Text-content-length"):
 411                         if (!constcmp(t, "Text-content-length")) {
 412                                 node_ctx.textLength = atoi(val);
 413                                 break;
 414                         }
 415                         if (constcmp(t, "Prop-content-length"))
 416                                 continue;
 417                         node_ctx.propLength = atoi(val);
 418                         break;
 419                 case sizeof("Text-delta"):
 420                         if (!constcmp(t, "Text-delta")) {
 421                                 node_ctx.text_delta = !strcmp(val, "true");
 422                                 break;
 423                         }
 424                         if (constcmp(t, "Prop-delta"))
 425                                 continue;
 426                         node_ctx.prop_delta = !strcmp(val, "true");
 427                         break;
 428                 case sizeof("Content-length"):
 429                         if (constcmp(t, "Content-length"))
 430                                 continue;
 431                         len = atoi(val);
 432                         t = buffer_read_line(&input);
 433                         if (!t)
 434                                 die_short_read();
 435                         if (*t)
 436                                 die("invalid dump: expected blank line after content length header");
 437                         if (active_ctx == REV_CTX) {
 438                                 read_props();
 439                         } else if (active_ctx == NODE_CTX) {
 440                                 handle_node();
 441                                 active_ctx = INTERNODE_CTX;
 442                         } else {
 443                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 444                                 if (buffer_skip_bytes(&input, len) != len)
 445                                         die_short_read();
 446                         }
 447                 }
 448         }
 449         if (buffer_ferror(&input))
 450                 die_short_read();
 451         if (active_ctx == NODE_CTX)
 452                 handle_node();
 453         if (active_ctx == REV_CTX)
 454                 begin_revision();
 455         if (active_ctx != DUMP_CTX)
 456                 end_revision();
 457 }
 458
 459 int svndump_init(const char *filename)
 460 {
 461         if (buffer_init(&input, filename))
 462                 return error("cannot open %s: %s", filename, strerror(errno));
 463         fast_export_init(REPORT_FILENO);
 464         strbuf_init(&dump_ctx.uuid, 4096);
 465         strbuf_init(&dump_ctx.url, 4096);
 466         strbuf_init(&rev_ctx.log, 4096);
 467         strbuf_init(&rev_ctx.author, 4096);
 468         strbuf_init(&node_ctx.src, 4096);
 469         strbuf_init(&node_ctx.dst, 4096);
 470         reset_dump_ctx(NULL);
 471         reset_rev_ctx(0);
 472         reset_node_ctx(NULL);
 473         return 0;
 474 }
 475
 476 void svndump_deinit(void)
 477 {
 478         fast_export_deinit();
 479         reset_dump_ctx(NULL);
 480         reset_rev_ctx(0);
 481         reset_node_ctx(NULL);
 482         strbuf_release(&rev_ctx.log);
 483         strbuf_release(&node_ctx.src);
 484         strbuf_release(&node_ctx.dst);
 485         if (buffer_deinit(&input))
 486                 fprintf(stderr, "Input error\n");
 487         if (ferror(stdout))
 488                 fprintf(stderr, "Output error\n");
 489 }
 490
 491 void svndump_reset(void)
 492 {
 493         fast_export_reset();
 494         buffer_reset(&input);
 495         strbuf_release(&dump_ctx.uuid);
 496         strbuf_release(&dump_ctx.url);
 497         strbuf_release(&rev_ctx.log);
 498         strbuf_release(&rev_ctx.author);
 499 }