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, srcRev, type;
  44         off_t text_length;
  45         struct strbuf src, dst;
  46         uint32_t text_delta, prop_delta;
  47 } node_ctx;
  48
  49 static struct {
  50         uint32_t revision;
  51         unsigned long timestamp;
  52         struct strbuf log, author;
  53 } rev_ctx;
  54
  55 static struct {
  56         uint32_t version;
  57         struct strbuf uuid, url;
  58 } dump_ctx;
  59
  60 static void reset_node_ctx(char *fname)
  61 {
  62         node_ctx.type = 0;
  63         node_ctx.action = NODEACT_UNKNOWN;
  64         node_ctx.propLength = LENGTH_UNKNOWN;
  65         node_ctx.text_length = -1;
  66         strbuf_reset(&node_ctx.src);
  67         node_ctx.srcRev = 0;
  68         strbuf_reset(&node_ctx.dst);
  69         if (fname)
  70                 strbuf_addstr(&node_ctx.dst, fname);
  71         node_ctx.text_delta = 0;
  72         node_ctx.prop_delta = 0;
  73 }
  74
  75 static void reset_rev_ctx(uint32_t revision)
  76 {
  77         rev_ctx.revision = revision;
  78         rev_ctx.timestamp = 0;
  79         strbuf_reset(&rev_ctx.log);
  80         strbuf_reset(&rev_ctx.author);
  81 }
  82
  83 static void reset_dump_ctx(const char *url)
  84 {
  85         strbuf_reset(&dump_ctx.url);
  86         if (url)
  87                 strbuf_addstr(&dump_ctx.url, url);
  88         dump_ctx.version = 1;
  89         strbuf_reset(&dump_ctx.uuid);
  90 }
  91
  92 static void handle_property(const struct strbuf *key_buf,
  93                                 struct strbuf *val,
  94                                 uint32_t *type_set)
  95 {
  96         const char *key = key_buf->buf;
  97         size_t keylen = key_buf->len;
  98
  99         switch (keylen + 1) {
 100         case sizeof("svn:log"):
 101                 if (constcmp(key, "svn:log"))
 102                         break;
 103                 if (!val)
 104                         die("invalid dump: unsets svn:log");
 105                 strbuf_swap(&rev_ctx.log, val);
 106                 break;
 107         case sizeof("svn:author"):
 108                 if (constcmp(key, "svn:author"))
 109                         break;
 110                 if (!val)
 111                         strbuf_reset(&rev_ctx.author);
 112                 else
 113                         strbuf_swap(&rev_ctx.author, val);
 114                 break;
 115         case sizeof("svn:date"):
 116                 if (constcmp(key, "svn:date"))
 117                         break;
 118                 if (!val)
 119                         die("invalid dump: unsets svn:date");
 120                 if (parse_date_basic(val->buf, &rev_ctx.timestamp, NULL))
 121                         warning("invalid timestamp: %s", val->buf);
 122                 break;
 123         case sizeof("svn:executable"):
 124         case sizeof("svn:special"):
 125                 if (keylen == strlen("svn:executable") &&
 126                     constcmp(key, "svn:executable"))
 127                         break;
 128                 if (keylen == strlen("svn:special") &&
 129                     constcmp(key, "svn:special"))
 130                         break;
 131                 if (*type_set) {
 132                         if (!val)
 133                                 return;
 134                         die("invalid dump: sets type twice");
 135                 }
 136                 if (!val) {
 137                         node_ctx.type = REPO_MODE_BLB;
 138                         return;
 139                 }
 140                 *type_set = 1;
 141                 node_ctx.type = keylen == strlen("svn:executable") ?
 142                                 REPO_MODE_EXE :
 143                                 REPO_MODE_LNK;
 144         }
 145 }
 146
 147 static void die_short_read(void)
 148 {
 149         if (buffer_ferror(&input))
 150                 die_errno("error reading dump file");
 151         die("invalid dump: unexpected end of file");
 152 }
 153
 154 static void read_props(void)
 155 {
 156         static struct strbuf key = STRBUF_INIT;
 157         static struct strbuf val = STRBUF_INIT;
 158         const char *t;
 159         /*
 160          * NEEDSWORK: to support simple mode changes like
 161          *      K 11
 162          *      svn:special
 163          *      V 1
 164          *      *
 165          *      D 14
 166          *      svn:executable
 167          * we keep track of whether a mode has been set and reset to
 168          * plain file only if not.  We should be keeping track of the
 169          * symlink and executable bits separately instead.
 170          */
 171         uint32_t type_set = 0;
 172         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
 173                 uint32_t len;
 174                 const char type = t[0];
 175                 int ch;
 176
 177                 if (!type || t[1] != ' ')
 178                         die("invalid property line: %s\n", t);
 179                 len = atoi(&t[2]);
 180                 strbuf_reset(&val);
 181                 buffer_read_binary(&input, &val, len);
 182                 if (val.len < len)
 183                         die_short_read();
 184
 185                 /* Discard trailing newline. */
 186                 ch = buffer_read_char(&input);
 187                 if (ch == EOF)
 188                         die_short_read();
 189                 if (ch != '\n')
 190                         die("invalid dump: expected newline after %s", val.buf);
 191
 192                 switch (type) {
 193                 case 'K':
 194                         strbuf_swap(&key, &val);
 195                         continue;
 196                 case 'D':
 197                         handle_property(&val, NULL, &type_set);
 198                         continue;
 199                 case 'V':
 200                         handle_property(&key, &val, &type_set);
 201                         strbuf_reset(&key);
 202                         continue;
 203                 default:
 204                         die("invalid property line: %s\n", t);
 205                 }
 206         }
 207 }
 208
 209 static void handle_node(void)
 210 {
 211         const uint32_t type = node_ctx.type;
 212         const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
 213         const int have_text = node_ctx.text_length != -1;
 214         /*
 215          * Old text for this node:
 216          *  NULL        - directory or bug
 217          *  empty_blob  - empty
 218          *  "<dataref>" - data retrievable from fast-import
 219          */
 220         static const char *const empty_blob = "::empty::";
 221         const char *old_data = NULL;
 222         uint32_t old_mode = REPO_MODE_BLB;
 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                 old_mode = mode;
 259         } else if (node_ctx.action == NODEACT_ADD) {
 260                 if (type == REPO_MODE_DIR)
 261                         old_data = NULL;
 262                 else if (have_text)
 263                         old_data = empty_blob;
 264                 else
 265                         die("invalid dump: adds node without text");
 266         } else {
 267                 die("invalid dump: Node-path block lacks Node-action");
 268         }
 269
 270         /*
 271          * Adjust mode to reflect properties.
 272          */
 273         if (have_props) {
 274                 if (!node_ctx.prop_delta)
 275                         node_ctx.type = type;
 276                 if (node_ctx.propLength)
 277                         read_props();
 278         }
 279
 280         /*
 281          * Save the result.
 282          */
 283         if (type == REPO_MODE_DIR)      /* directories are not tracked. */
 284                 return;
 285         assert(old_data);
 286         if (old_data == empty_blob)
 287                 /* For the fast_export_* functions, NULL means empty. */
 288                 old_data = NULL;
 289         if (!have_text) {
 290                 fast_export_modify(node_ctx.dst.buf, node_ctx.type, old_data);
 291                 return;
 292         }
 293         if (!node_ctx.text_delta) {
 294                 fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
 295                 fast_export_data(node_ctx.type, node_ctx.text_length, &input);
 296                 return;
 297         }
 298         fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
 299         fast_export_blob_delta(node_ctx.type, old_mode, old_data,
 300                                 node_ctx.text_length, &input);
 301 }
 302
 303 static void begin_revision(void)
 304 {
 305         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
 306                 return;
 307         fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
 308                 &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
 309                 rev_ctx.timestamp);
 310 }
 311
 312 static void end_revision(void)
 313 {
 314         if (rev_ctx.revision)
 315                 fast_export_end_commit(rev_ctx.revision);
 316 }
 317
 318 void svndump_read(const char *url)
 319 {
 320         char *val;
 321         char *t;
 322         uint32_t active_ctx = DUMP_CTX;
 323         uint32_t len;
 324
 325         reset_dump_ctx(url);
 326         while ((t = buffer_read_line(&input))) {
 327                 val = strchr(t, ':');
 328                 if (!val)
 329                         continue;
 330                 val++;
 331                 if (*val != ' ')
 332                         continue;
 333                 val++;
 334
 335                 /* strlen(key) + 1 */
 336                 switch (val - t - 1) {
 337                 case sizeof("SVN-fs-dump-format-version"):
 338                         if (constcmp(t, "SVN-fs-dump-format-version"))
 339                                 continue;
 340                         dump_ctx.version = atoi(val);
 341                         if (dump_ctx.version > 3)
 342                                 die("expected svn dump format version <= 3, found %"PRIu32,
 343                                     dump_ctx.version);
 344                         break;
 345                 case sizeof("UUID"):
 346                         if (constcmp(t, "UUID"))
 347                                 continue;
 348                         strbuf_reset(&dump_ctx.uuid);
 349                         strbuf_addstr(&dump_ctx.uuid, val);
 350                         break;
 351                 case sizeof("Revision-number"):
 352                         if (constcmp(t, "Revision-number"))
 353                                 continue;
 354                         if (active_ctx == NODE_CTX)
 355                                 handle_node();
 356                         if (active_ctx == REV_CTX)
 357                                 begin_revision();
 358                         if (active_ctx != DUMP_CTX)
 359                                 end_revision();
 360                         active_ctx = REV_CTX;
 361                         reset_rev_ctx(atoi(val));
 362                         break;
 363                 case sizeof("Node-path"):
 364                         if (prefixcmp(t, "Node-"))
 365                                 continue;
 366                         if (!constcmp(t + strlen("Node-"), "path")) {
 367                                 if (active_ctx == NODE_CTX)
 368                                         handle_node();
 369                                 if (active_ctx == REV_CTX)
 370                                         begin_revision();
 371                                 active_ctx = NODE_CTX;
 372                                 reset_node_ctx(val);
 373                                 break;
 374                         }
 375                         if (constcmp(t + strlen("Node-"), "kind"))
 376                                 continue;
 377                         if (!strcmp(val, "dir"))
 378                                 node_ctx.type = REPO_MODE_DIR;
 379                         else if (!strcmp(val, "file"))
 380                                 node_ctx.type = REPO_MODE_BLB;
 381                         else
 382                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 383                         break;
 384                 case sizeof("Node-action"):
 385                         if (constcmp(t, "Node-action"))
 386                                 continue;
 387                         if (!strcmp(val, "delete")) {
 388                                 node_ctx.action = NODEACT_DELETE;
 389                         } else if (!strcmp(val, "add")) {
 390                                 node_ctx.action = NODEACT_ADD;
 391                         } else if (!strcmp(val, "change")) {
 392                                 node_ctx.action = NODEACT_CHANGE;
 393                         } else if (!strcmp(val, "replace")) {
 394                                 node_ctx.action = NODEACT_REPLACE;
 395                         } else {
 396                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 397                                 node_ctx.action = NODEACT_UNKNOWN;
 398                         }
 399                         break;
 400                 case sizeof("Node-copyfrom-path"):
 401                         if (constcmp(t, "Node-copyfrom-path"))
 402                                 continue;
 403                         strbuf_reset(&node_ctx.src);
 404                         strbuf_addstr(&node_ctx.src, val);
 405                         break;
 406                 case sizeof("Node-copyfrom-rev"):
 407                         if (constcmp(t, "Node-copyfrom-rev"))
 408                                 continue;
 409                         node_ctx.srcRev = atoi(val);
 410                         break;
 411                 case sizeof("Text-content-length"):
 412                         if (!constcmp(t, "Text-content-length")) {
 413                                 char *end;
 414                                 uintmax_t textlen;
 415
 416                                 textlen = strtoumax(val, &end, 10);
 417                                 if (!isdigit(*val) || *end)
 418                                         die("invalid dump: non-numeric length %s", val);
 419                                 if (textlen > maximum_signed_value_of_type(off_t))
 420                                         die("unrepresentable length in dump: %s", val);
 421                                 node_ctx.text_length = (off_t) textlen;
 422                                 break;
 423                         }
 424                         if (constcmp(t, "Prop-content-length"))
 425                                 continue;
 426                         node_ctx.propLength = atoi(val);
 427                         break;
 428                 case sizeof("Text-delta"):
 429                         if (!constcmp(t, "Text-delta")) {
 430                                 node_ctx.text_delta = !strcmp(val, "true");
 431                                 break;
 432                         }
 433                         if (constcmp(t, "Prop-delta"))
 434                                 continue;
 435                         node_ctx.prop_delta = !strcmp(val, "true");
 436                         break;
 437                 case sizeof("Content-length"):
 438                         if (constcmp(t, "Content-length"))
 439                                 continue;
 440                         len = atoi(val);
 441                         t = buffer_read_line(&input);
 442                         if (!t)
 443                                 die_short_read();
 444                         if (*t)
 445                                 die("invalid dump: expected blank line after content length header");
 446                         if (active_ctx == REV_CTX) {
 447                                 read_props();
 448                         } else if (active_ctx == NODE_CTX) {
 449                                 handle_node();
 450                                 active_ctx = INTERNODE_CTX;
 451                         } else {
 452                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 453                                 if (buffer_skip_bytes(&input, len) != len)
 454                                         die_short_read();
 455                         }
 456                 }
 457         }
 458         if (buffer_ferror(&input))
 459                 die_short_read();
 460         if (active_ctx == NODE_CTX)
 461                 handle_node();
 462         if (active_ctx == REV_CTX)
 463                 begin_revision();
 464         if (active_ctx != DUMP_CTX)
 465                 end_revision();
 466 }
 467
 468 int svndump_init(const char *filename)
 469 {
 470         if (buffer_init(&input, filename))
 471                 return error("cannot open %s: %s", filename, strerror(errno));
 472         fast_export_init(REPORT_FILENO);
 473         strbuf_init(&dump_ctx.uuid, 4096);
 474         strbuf_init(&dump_ctx.url, 4096);
 475         strbuf_init(&rev_ctx.log, 4096);
 476         strbuf_init(&rev_ctx.author, 4096);
 477         strbuf_init(&node_ctx.src, 4096);
 478         strbuf_init(&node_ctx.dst, 4096);
 479         reset_dump_ctx(NULL);
 480         reset_rev_ctx(0);
 481         reset_node_ctx(NULL);
 482         return 0;
 483 }
 484
 485 void svndump_deinit(void)
 486 {
 487         fast_export_deinit();
 488         reset_dump_ctx(NULL);
 489         reset_rev_ctx(0);
 490         reset_node_ctx(NULL);
 491         strbuf_release(&rev_ctx.log);
 492         strbuf_release(&node_ctx.src);
 493         strbuf_release(&node_ctx.dst);
 494         if (buffer_deinit(&input))
 495                 fprintf(stderr, "Input error\n");
 496         if (ferror(stdout))
 497                 fprintf(stderr, "Output error\n");
 498 }
 499
 500 void svndump_reset(void)
 501 {
 502         fast_export_reset();
 503         buffer_reset(&input);
 504         strbuf_release(&dump_ctx.uuid);
 505         strbuf_release(&dump_ctx.url);
 506         strbuf_release(&rev_ctx.log);
 507         strbuf_release(&rev_ctx.author);
 508 }