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