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