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 NODEACT_REPLACE 4
  18 #define NODEACT_DELETE 3
  19 #define NODEACT_ADD 2
  20 #define NODEACT_CHANGE 1
  21 #define NODEACT_UNKNOWN 0
  22
  23 #define DUMP_CTX 0
  24 #define REV_CTX  1
  25 #define NODE_CTX 2
  26
  27 #define LENGTH_UNKNOWN (~0)
  28 #define DATE_RFC2822_LEN 31
  29
  30 /* Create memory pool for log messages */
  31 obj_pool_gen(log, char, 4096)
  32
  33 static struct line_buffer input = LINE_BUFFER_INIT;
  34
  35 static char* log_copy(uint32_t length, char *log)
  36 {
  37         char *buffer;
  38         log_free(log_pool.size);
  39         buffer = log_pointer(log_alloc(length));
  40         strncpy(buffer, log, length);
  41         return buffer;
  42 }
  43
  44 static struct {
  45         uint32_t action, propLength, textLength, srcRev, srcMode, mark, type;
  46         uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
  47 } node_ctx;
  48
  49 static struct {
  50         uint32_t revision, author;
  51         unsigned long timestamp;
  52         char *log;
  53 } rev_ctx;
  54
  55 static struct {
  56         uint32_t version, uuid, url;
  57 } dump_ctx;
  58
  59 static struct {
  60         uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, uuid,
  61                 revision_number, node_path, node_kind, node_action,
  62                 node_copyfrom_path, node_copyfrom_rev, text_content_length,
  63                 prop_content_length, content_length, svn_fs_dump_format_version;
  64 } keys;
  65
  66 static void reset_node_ctx(char *fname)
  67 {
  68         node_ctx.type = 0;
  69         node_ctx.action = NODEACT_UNKNOWN;
  70         node_ctx.propLength = LENGTH_UNKNOWN;
  71         node_ctx.textLength = LENGTH_UNKNOWN;
  72         node_ctx.src[0] = ~0;
  73         node_ctx.srcRev = 0;
  74         node_ctx.srcMode = 0;
  75         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
  76         node_ctx.mark = 0;
  77 }
  78
  79 static void reset_rev_ctx(uint32_t revision)
  80 {
  81         rev_ctx.revision = revision;
  82         rev_ctx.timestamp = 0;
  83         rev_ctx.log = NULL;
  84         rev_ctx.author = ~0;
  85 }
  86
  87 static void reset_dump_ctx(uint32_t url)
  88 {
  89         dump_ctx.url = url;
  90         dump_ctx.version = 1;
  91         dump_ctx.uuid = ~0;
  92 }
  93
  94 static void init_keys(void)
  95 {
  96         keys.svn_log = pool_intern("svn:log");
  97         keys.svn_author = pool_intern("svn:author");
  98         keys.svn_date = pool_intern("svn:date");
  99         keys.svn_executable = pool_intern("svn:executable");
 100         keys.svn_special = pool_intern("svn:special");
 101         keys.uuid = pool_intern("UUID");
 102         keys.revision_number = pool_intern("Revision-number");
 103         keys.node_path = pool_intern("Node-path");
 104         keys.node_kind = pool_intern("Node-kind");
 105         keys.node_action = pool_intern("Node-action");
 106         keys.node_copyfrom_path = pool_intern("Node-copyfrom-path");
 107         keys.node_copyfrom_rev = pool_intern("Node-copyfrom-rev");
 108         keys.text_content_length = pool_intern("Text-content-length");
 109         keys.prop_content_length = pool_intern("Prop-content-length");
 110         keys.content_length = pool_intern("Content-length");
 111         keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
 112 }
 113
 114 static void read_props(void)
 115 {
 116         uint32_t len;
 117         uint32_t key = ~0;
 118         char *val = NULL;
 119         char *t;
 120         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
 121                 if (!strncmp(t, "K ", 2)) {
 122                         len = atoi(&t[2]);
 123                         key = pool_intern(buffer_read_string(&input, len));
 124                         buffer_read_line(&input);
 125                 } else if (!strncmp(t, "V ", 2)) {
 126                         len = atoi(&t[2]);
 127                         val = buffer_read_string(&input, len);
 128                         if (key == keys.svn_log) {
 129                                 /* Value length excludes terminating nul. */
 130                                 rev_ctx.log = log_copy(len + 1, val);
 131                         } else if (key == keys.svn_author) {
 132                                 rev_ctx.author = pool_intern(val);
 133                         } else if (key == keys.svn_date) {
 134                                 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
 135                                         fprintf(stderr, "Invalid timestamp: %s\n", val);
 136                         } else if (key == keys.svn_executable) {
 137                                 node_ctx.type = REPO_MODE_EXE;
 138                         } else if (key == keys.svn_special) {
 139                                 node_ctx.type = REPO_MODE_LNK;
 140                         }
 141                         key = ~0;
 142                         buffer_read_line(&input);
 143                 }
 144         }
 145 }
 146
 147 static void handle_node(void)
 148 {
 149         if (node_ctx.propLength != LENGTH_UNKNOWN && node_ctx.propLength)
 150                 read_props();
 151
 152         if (node_ctx.srcRev)
 153                 node_ctx.srcMode = repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
 154
 155         if (node_ctx.textLength != LENGTH_UNKNOWN &&
 156             node_ctx.type != REPO_MODE_DIR)
 157                 node_ctx.mark = next_blob_mark();
 158
 159         if (node_ctx.action == NODEACT_DELETE) {
 160                 repo_delete(node_ctx.dst);
 161         } else if (node_ctx.action == NODEACT_CHANGE ||
 162                            node_ctx.action == NODEACT_REPLACE) {
 163                 if (node_ctx.action == NODEACT_REPLACE &&
 164                     node_ctx.type == REPO_MODE_DIR)
 165                         repo_replace(node_ctx.dst, node_ctx.mark);
 166                 else if (node_ctx.propLength != LENGTH_UNKNOWN)
 167                         repo_modify(node_ctx.dst, node_ctx.type, node_ctx.mark);
 168                 else if (node_ctx.textLength != LENGTH_UNKNOWN)
 169                         node_ctx.srcMode = repo_replace(node_ctx.dst, node_ctx.mark);
 170         } else if (node_ctx.action == NODEACT_ADD) {
 171                 if (node_ctx.srcRev && node_ctx.propLength != LENGTH_UNKNOWN)
 172                         repo_modify(node_ctx.dst, node_ctx.type, node_ctx.mark);
 173                 else if (node_ctx.srcRev && node_ctx.textLength != LENGTH_UNKNOWN)
 174                         node_ctx.srcMode = repo_replace(node_ctx.dst, node_ctx.mark);
 175                 else if ((node_ctx.type == REPO_MODE_DIR && !node_ctx.srcRev) ||
 176                          node_ctx.textLength != LENGTH_UNKNOWN)
 177                         repo_add(node_ctx.dst, node_ctx.type, node_ctx.mark);
 178         }
 179
 180         if (node_ctx.propLength == LENGTH_UNKNOWN && node_ctx.srcMode)
 181                 node_ctx.type = node_ctx.srcMode;
 182
 183         if (node_ctx.mark)
 184                 fast_export_blob(node_ctx.type,
 185                                  node_ctx.mark, node_ctx.textLength, &input);
 186         else if (node_ctx.textLength != LENGTH_UNKNOWN)
 187                 buffer_skip_bytes(&input, node_ctx.textLength);
 188 }
 189
 190 static void handle_revision(void)
 191 {
 192         if (rev_ctx.revision)
 193                 repo_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
 194                         dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
 195 }
 196
 197 void svndump_read(const char *url)
 198 {
 199         char *val;
 200         char *t;
 201         uint32_t active_ctx = DUMP_CTX;
 202         uint32_t len;
 203         uint32_t key;
 204
 205         reset_dump_ctx(pool_intern(url));
 206         while ((t = buffer_read_line(&input))) {
 207                 val = strstr(t, ": ");
 208                 if (!val)
 209                         continue;
 210                 *val++ = '\0';
 211                 *val++ = '\0';
 212                 key = pool_intern(t);
 213
 214                 if (key == keys.svn_fs_dump_format_version) {
 215                         dump_ctx.version = atoi(val);
 216                         if (dump_ctx.version > 2)
 217                                 die("expected svn dump format version <= 2, found %"PRIu32,
 218                                     dump_ctx.version);
 219                 } else if (key == keys.uuid) {
 220                         dump_ctx.uuid = pool_intern(val);
 221                 } else if (key == keys.revision_number) {
 222                         if (active_ctx == NODE_CTX)
 223                                 handle_node();
 224                         if (active_ctx != DUMP_CTX)
 225                                 handle_revision();
 226                         active_ctx = REV_CTX;
 227                         reset_rev_ctx(atoi(val));
 228                 } else if (key == keys.node_path) {
 229                         if (active_ctx == NODE_CTX)
 230                                 handle_node();
 231                         active_ctx = NODE_CTX;
 232                         reset_node_ctx(val);
 233                 } else if (key == keys.node_kind) {
 234                         if (!strcmp(val, "dir"))
 235                                 node_ctx.type = REPO_MODE_DIR;
 236                         else if (!strcmp(val, "file"))
 237                                 node_ctx.type = REPO_MODE_BLB;
 238                         else
 239                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 240                 } else if (key == keys.node_action) {
 241                         if (!strcmp(val, "delete")) {
 242                                 node_ctx.action = NODEACT_DELETE;
 243                         } else if (!strcmp(val, "add")) {
 244                                 node_ctx.action = NODEACT_ADD;
 245                         } else if (!strcmp(val, "change")) {
 246                                 node_ctx.action = NODEACT_CHANGE;
 247                         } else if (!strcmp(val, "replace")) {
 248                                 node_ctx.action = NODEACT_REPLACE;
 249                         } else {
 250                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 251                                 node_ctx.action = NODEACT_UNKNOWN;
 252                         }
 253                 } else if (key == keys.node_copyfrom_path) {
 254                         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
 255                 } else if (key == keys.node_copyfrom_rev) {
 256                         node_ctx.srcRev = atoi(val);
 257                 } else if (key == keys.text_content_length) {
 258                         node_ctx.textLength = atoi(val);
 259                 } else if (key == keys.prop_content_length) {
 260                         node_ctx.propLength = atoi(val);
 261                 } else if (key == keys.content_length) {
 262                         len = atoi(val);
 263                         buffer_read_line(&input);
 264                         if (active_ctx == REV_CTX) {
 265                                 read_props();
 266                         } else if (active_ctx == NODE_CTX) {
 267                                 handle_node();
 268                                 active_ctx = REV_CTX;
 269                         } else {
 270                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 271                                 buffer_skip_bytes(&input, len);
 272                         }
 273                 }
 274         }
 275         if (active_ctx == NODE_CTX)
 276                 handle_node();
 277         if (active_ctx != DUMP_CTX)
 278                 handle_revision();
 279 }
 280
 281 void svndump_init(const char *filename)
 282 {
 283         buffer_init(&input, filename);
 284         repo_init();
 285         reset_dump_ctx(~0);
 286         reset_rev_ctx(0);
 287         reset_node_ctx(NULL);
 288         init_keys();
 289 }
 290
 291 void svndump_deinit(void)
 292 {
 293         log_reset();
 294         repo_reset();
 295         reset_dump_ctx(~0);
 296         reset_rev_ctx(0);
 297         reset_node_ctx(NULL);
 298         if (buffer_deinit(&input))
 299                 fprintf(stderr, "Input error\n");
 300         if (ferror(stdout))
 301                 fprintf(stderr, "Output error\n");
 302 }
 303
 304 void svndump_reset(void)
 305 {
 306         log_reset();
 307         buffer_reset(&input);
 308         repo_reset();
 309         reset_dump_ctx(~0);
 310         reset_rev_ctx(0);
 311         reset_node_ctx(NULL);
 312 }