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 "obj_pool.h"
  15 #include "string_pool.h"
  16
  17 #define REPORT_FILENO 3
  18
  19 #define NODEACT_REPLACE 4
  20 #define NODEACT_DELETE 3
  21 #define NODEACT_ADD 2
  22 #define NODEACT_CHANGE 1
  23 #define NODEACT_UNKNOWN 0
  24
  25 /* States: */
  26 #define DUMP_CTX 0      /* dump metadata */
  27 #define REV_CTX  1      /* revision metadata */
  28 #define NODE_CTX 2      /* node metadata */
  29 #define INTERNODE_CTX 3 /* between nodes */
  30
  31 #define LENGTH_UNKNOWN (~0)
  32 #define DATE_RFC2822_LEN 31
  33
  34 /* Create memory pool for log messages */
  35 obj_pool_gen(log, char, 4096)
  36
  37 static struct line_buffer input = LINE_BUFFER_INIT;
  38
  39 #define REPORT_FILENO 3
  40
  41 static char *log_copy(uint32_t length, const char *log)
  42 {
  43         char *buffer;
  44         log_free(log_pool.size);
  45         buffer = log_pointer(log_alloc(length));
  46         strncpy(buffer, log, length);
  47         return buffer;
  48 }
  49
  50 static struct {
  51         uint32_t action, propLength, textLength, srcRev, type;
  52         uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
  53         uint32_t text_delta, prop_delta;
  54 } node_ctx;
  55
  56 static struct {
  57         uint32_t revision, author;
  58         unsigned long timestamp;
  59         char *log;
  60 } rev_ctx;
  61
  62 static struct {
  63         uint32_t version, uuid, url;
  64 } dump_ctx;
  65
  66 static struct {
  67         uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, uuid,
  68                 revision_number, node_path, node_kind, node_action,
  69                 node_copyfrom_path, node_copyfrom_rev, text_content_length,
  70                 prop_content_length, content_length, svn_fs_dump_format_version,
  71                 /* version 3 format */
  72                 text_delta, prop_delta;
  73 } keys;
  74
  75 static void reset_node_ctx(char *fname)
  76 {
  77         node_ctx.type = 0;
  78         node_ctx.action = NODEACT_UNKNOWN;
  79         node_ctx.propLength = LENGTH_UNKNOWN;
  80         node_ctx.textLength = LENGTH_UNKNOWN;
  81         node_ctx.src[0] = ~0;
  82         node_ctx.srcRev = 0;
  83         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
  84         node_ctx.text_delta = 0;
  85         node_ctx.prop_delta = 0;
  86 }
  87
  88 static void reset_rev_ctx(uint32_t revision)
  89 {
  90         rev_ctx.revision = revision;
  91         rev_ctx.timestamp = 0;
  92         rev_ctx.log = NULL;
  93         rev_ctx.author = ~0;
  94 }
  95
  96 static void reset_dump_ctx(uint32_t url)
  97 {
  98         dump_ctx.url = url;
  99         dump_ctx.version = 1;
 100         dump_ctx.uuid = ~0;
 101 }
 102
 103 static void init_keys(void)
 104 {
 105         keys.svn_log = pool_intern("svn:log");
 106         keys.svn_author = pool_intern("svn:author");
 107         keys.svn_date = pool_intern("svn:date");
 108         keys.svn_executable = pool_intern("svn:executable");
 109         keys.svn_special = pool_intern("svn:special");
 110         keys.uuid = pool_intern("UUID");
 111         keys.revision_number = pool_intern("Revision-number");
 112         keys.node_path = pool_intern("Node-path");
 113         keys.node_kind = pool_intern("Node-kind");
 114         keys.node_action = pool_intern("Node-action");
 115         keys.node_copyfrom_path = pool_intern("Node-copyfrom-path");
 116         keys.node_copyfrom_rev = pool_intern("Node-copyfrom-rev");
 117         keys.text_content_length = pool_intern("Text-content-length");
 118         keys.prop_content_length = pool_intern("Prop-content-length");
 119         keys.content_length = pool_intern("Content-length");
 120         keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
 121         /* version 3 format (Subversion 1.1.0) */
 122         keys.text_delta = pool_intern("Text-delta");
 123         keys.prop_delta = pool_intern("Prop-delta");
 124 }
 125
 126 static void handle_property(uint32_t key, const char *val, uint32_t len,
 127                                 uint32_t *type_set)
 128 {
 129         if (key == keys.svn_log) {
 130                 if (!val)
 131                         die("invalid dump: unsets svn:log");
 132                 /* Value length excludes terminating nul. */
 133                 rev_ctx.log = log_copy(len + 1, val);
 134         } else if (key == keys.svn_author) {
 135                 rev_ctx.author = pool_intern(val);
 136         } else if (key == keys.svn_date) {
 137                 if (!val)
 138                         die("invalid dump: unsets svn:date");
 139                 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
 140                         warning("invalid timestamp: %s", val);
 141         } else if (key == keys.svn_executable || key == keys.svn_special) {
 142                 if (*type_set) {
 143                         if (!val)
 144                                 return;
 145                         die("invalid dump: sets type twice");
 146                 }
 147                 if (!val) {
 148                         node_ctx.type = REPO_MODE_BLB;
 149                         return;
 150                 }
 151                 *type_set = 1;
 152                 node_ctx.type = key == keys.svn_executable ?
 153                                 REPO_MODE_EXE :
 154                                 REPO_MODE_LNK;
 155         }
 156 }
 157
 158 static void read_props(void)
 159 {
 160         uint32_t key = ~0;
 161         const char *t;
 162         /*
 163          * NEEDSWORK: to support simple mode changes like
 164          *      K 11
 165          *      svn:special
 166          *      V 1
 167          *      *
 168          *      D 14
 169          *      svn:executable
 170          * we keep track of whether a mode has been set and reset to
 171          * plain file only if not.  We should be keeping track of the
 172          * symlink and executable bits separately instead.
 173          */
 174         uint32_t type_set = 0;
 175         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
 176                 uint32_t len;
 177                 const char *val;
 178                 const char type = t[0];
 179
 180                 if (!type || t[1] != ' ')
 181                         die("invalid property line: %s\n", t);
 182                 len = atoi(&t[2]);
 183                 val = buffer_read_string(&input, len);
 184                 buffer_skip_bytes(&input, 1);   /* Discard trailing newline. */
 185
 186                 switch (type) {
 187                 case 'K':
 188                         key = pool_intern(val);
 189                         continue;
 190                 case 'D':
 191                         key = pool_intern(val);
 192                         val = NULL;
 193                         len = 0;
 194                         /* fall through */
 195                 case 'V':
 196                         handle_property(key, val, len, &type_set);
 197                         key = ~0;
 198                         continue;
 199                 default:
 200                         die("invalid property line: %s\n", t);
 201                 }
 202         }
 203 }
 204
 205 static void handle_node(void)
 206 {
 207         const uint32_t type = node_ctx.type;
 208         const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
 209         const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
 210         /*
 211          * Old text for this node:
 212          *  NULL        - directory or bug
 213          *  empty_blob  - empty
 214          *  "<dataref>" - data retrievable from fast-import
 215          */
 216         static const char *const empty_blob = "::empty::";
 217         const char *old_data = NULL;
 218
 219         if (node_ctx.text_delta)
 220                 die("text deltas not supported");
 221
 222         if (node_ctx.action == NODEACT_DELETE) {
 223                 if (have_text || have_props || node_ctx.srcRev)
 224                         die("invalid dump: deletion node has "
 225                                 "copyfrom info, text, or properties");
 226                 return repo_delete(node_ctx.dst);
 227         }
 228         if (node_ctx.action == NODEACT_REPLACE) {
 229                 repo_delete(node_ctx.dst);
 230                 node_ctx.action = NODEACT_ADD;
 231         }
 232         if (node_ctx.srcRev) {
 233                 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
 234                 if (node_ctx.action == NODEACT_ADD)
 235                         node_ctx.action = NODEACT_CHANGE;
 236         }
 237         if (have_text && type == REPO_MODE_DIR)
 238                 die("invalid dump: directories cannot have text attached");
 239
 240         /*
 241          * Find old content (old_data) and decide on the new mode.
 242          */
 243         if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
 244                 if (type != REPO_MODE_DIR)
 245                         die("invalid dump: root of tree is not a regular file");
 246                 old_data = NULL;
 247         } else if (node_ctx.action == NODEACT_CHANGE) {
 248                 uint32_t mode;
 249                 old_data = repo_read_path(node_ctx.dst, &mode);
 250                 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
 251                         die("invalid dump: cannot modify a directory into a file");
 252                 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
 253                         die("invalid dump: cannot modify a file into a directory");
 254                 node_ctx.type = mode;
 255         } else if (node_ctx.action == NODEACT_ADD) {
 256                 if (type == REPO_MODE_DIR)
 257                         old_data = NULL;
 258                 else if (have_text)
 259                         old_data = empty_blob;
 260                 else
 261                         die("invalid dump: adds node without text");
 262         } else {
 263                 die("invalid dump: Node-path block lacks Node-action");
 264         }
 265
 266         /*
 267          * Adjust mode to reflect properties.
 268          */
 269         if (have_props) {
 270                 if (!node_ctx.prop_delta)
 271                         node_ctx.type = type;
 272                 if (node_ctx.propLength)
 273                         read_props();
 274         }
 275
 276         /*
 277          * Save the result.
 278          */
 279         if (type == REPO_MODE_DIR)      /* directories are not tracked. */
 280                 return;
 281         assert(old_data);
 282         if (old_data == empty_blob)
 283                 /* For the fast_export_* functions, NULL means empty. */
 284                 old_data = NULL;
 285         if (!have_text) {
 286                 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
 287                                         node_ctx.type, old_data);
 288                 return;
 289         }
 290         fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
 291                                 node_ctx.type, "inline");
 292         fast_export_data(node_ctx.type, node_ctx.textLength, &input);
 293 }
 294
 295 static void begin_revision(void)
 296 {
 297         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
 298                 return;
 299         fast_export_begin_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
 300                 dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
 301 }
 302
 303 static void end_revision(void)
 304 {
 305         if (rev_ctx.revision)
 306                 fast_export_end_commit(rev_ctx.revision);
 307 }
 308
 309 void svndump_read(const char *url)
 310 {
 311         char *val;
 312         char *t;
 313         uint32_t active_ctx = DUMP_CTX;
 314         uint32_t len;
 315         uint32_t key;
 316
 317         reset_dump_ctx(pool_intern(url));
 318         while ((t = buffer_read_line(&input))) {
 319                 val = strstr(t, ": ");
 320                 if (!val)
 321                         continue;
 322                 *val++ = '\0';
 323                 *val++ = '\0';
 324                 key = pool_intern(t);
 325
 326                 if (key == keys.svn_fs_dump_format_version) {
 327                         dump_ctx.version = atoi(val);
 328                         if (dump_ctx.version > 3)
 329                                 die("expected svn dump format version <= 3, found %"PRIu32,
 330                                     dump_ctx.version);
 331                 } else if (key == keys.uuid) {
 332                         dump_ctx.uuid = pool_intern(val);
 333                 } else if (key == keys.revision_number) {
 334                         if (active_ctx == NODE_CTX)
 335                                 handle_node();
 336                         if (active_ctx == REV_CTX)
 337                                 begin_revision();
 338                         if (active_ctx != DUMP_CTX)
 339                                 end_revision();
 340                         active_ctx = REV_CTX;
 341                         reset_rev_ctx(atoi(val));
 342                 } else if (key == keys.node_path) {
 343                         if (active_ctx == NODE_CTX)
 344                                 handle_node();
 345                         if (active_ctx == REV_CTX)
 346                                 begin_revision();
 347                         active_ctx = NODE_CTX;
 348                         reset_node_ctx(val);
 349                 } else if (key == keys.node_kind) {
 350                         if (!strcmp(val, "dir"))
 351                                 node_ctx.type = REPO_MODE_DIR;
 352                         else if (!strcmp(val, "file"))
 353                                 node_ctx.type = REPO_MODE_BLB;
 354                         else
 355                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 356                 } else if (key == keys.node_action) {
 357                         if (!strcmp(val, "delete")) {
 358                                 node_ctx.action = NODEACT_DELETE;
 359                         } else if (!strcmp(val, "add")) {
 360                                 node_ctx.action = NODEACT_ADD;
 361                         } else if (!strcmp(val, "change")) {
 362                                 node_ctx.action = NODEACT_CHANGE;
 363                         } else if (!strcmp(val, "replace")) {
 364                                 node_ctx.action = NODEACT_REPLACE;
 365                         } else {
 366                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 367                                 node_ctx.action = NODEACT_UNKNOWN;
 368                         }
 369                 } else if (key == keys.node_copyfrom_path) {
 370                         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
 371                 } else if (key == keys.node_copyfrom_rev) {
 372                         node_ctx.srcRev = atoi(val);
 373                 } else if (key == keys.text_content_length) {
 374                         node_ctx.textLength = atoi(val);
 375                 } else if (key == keys.prop_content_length) {
 376                         node_ctx.propLength = atoi(val);
 377                 } else if (key == keys.text_delta) {
 378                         node_ctx.text_delta = !strcmp(val, "true");
 379                 } else if (key == keys.prop_delta) {
 380                         node_ctx.prop_delta = !strcmp(val, "true");
 381                 } else if (key == keys.content_length) {
 382                         len = atoi(val);
 383                         buffer_read_line(&input);
 384                         if (active_ctx == REV_CTX) {
 385                                 read_props();
 386                         } else if (active_ctx == NODE_CTX) {
 387                                 handle_node();
 388                                 active_ctx = INTERNODE_CTX;
 389                         } else {
 390                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 391                                 buffer_skip_bytes(&input, len);
 392                         }
 393                 }
 394         }
 395         if (active_ctx == NODE_CTX)
 396                 handle_node();
 397         if (active_ctx == REV_CTX)
 398                 begin_revision();
 399         if (active_ctx != DUMP_CTX)
 400                 end_revision();
 401 }
 402
 403 int svndump_init(const char *filename)
 404 {
 405         if (buffer_init(&input, filename))
 406                 return error("cannot open %s: %s", filename, strerror(errno));
 407         fast_export_init(REPORT_FILENO);
 408         reset_dump_ctx(~0);
 409         reset_rev_ctx(0);
 410         reset_node_ctx(NULL);
 411         init_keys();
 412         return 0;
 413 }
 414
 415 void svndump_deinit(void)
 416 {
 417         log_reset();
 418         fast_export_deinit();
 419         reset_dump_ctx(~0);
 420         reset_rev_ctx(0);
 421         reset_node_ctx(NULL);
 422         if (buffer_deinit(&input))
 423                 fprintf(stderr, "Input error\n");
 424         if (ferror(stdout))
 425                 fprintf(stderr, "Output error\n");
 426 }
 427
 428 void svndump_reset(void)
 429 {
 430         log_reset();
 431         fast_export_reset();
 432         buffer_reset(&input);
 433         reset_dump_ctx(~0);
 434         reset_rev_ctx(0);
 435         reset_node_ctx(NULL);
 436 }