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 char* log_copy(uint32_t length, char *log)
  34 {
  35         char *buffer;
  36         log_free(log_pool.size);
  37         buffer = log_pointer(log_alloc(length));
  38         strncpy(buffer, log, length);
  39         return buffer;
  40 }
  41
  42 static struct {
  43         uint32_t action, propLength, textLength, srcRev, mark, type;
  44         uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
  45         uint32_t text_delta, prop_delta;
  46 } node_ctx;
  47
  48 static struct {
  49         uint32_t revision, author;
  50         unsigned long timestamp;
  51         char *log;
  52 } rev_ctx;
  53
  54 static struct {
  55         uint32_t version, uuid, url;
  56 } dump_ctx;
  57
  58 static struct {
  59         uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, uuid,
  60                 revision_number, node_path, node_kind, node_action,
  61                 node_copyfrom_path, node_copyfrom_rev, text_content_length,
  62                 prop_content_length, content_length, svn_fs_dump_format_version,
  63                 /* version 3 format */
  64                 text_delta, prop_delta;
  65 } keys;
  66
  67 static void reset_node_ctx(char *fname)
  68 {
  69         node_ctx.type = 0;
  70         node_ctx.action = NODEACT_UNKNOWN;
  71         node_ctx.propLength = LENGTH_UNKNOWN;
  72         node_ctx.textLength = LENGTH_UNKNOWN;
  73         node_ctx.src[0] = ~0;
  74         node_ctx.srcRev = 0;
  75         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
  76         node_ctx.mark = 0;
  77         node_ctx.text_delta = 0;
  78         node_ctx.prop_delta = 0;
  79 }
  80
  81 static void reset_rev_ctx(uint32_t revision)
  82 {
  83         rev_ctx.revision = revision;
  84         rev_ctx.timestamp = 0;
  85         rev_ctx.log = NULL;
  86         rev_ctx.author = ~0;
  87 }
  88
  89 static void reset_dump_ctx(uint32_t url)
  90 {
  91         dump_ctx.url = url;
  92         dump_ctx.version = 1;
  93         dump_ctx.uuid = ~0;
  94 }
  95
  96 static void init_keys(void)
  97 {
  98         keys.svn_log = pool_intern("svn:log");
  99         keys.svn_author = pool_intern("svn:author");
 100         keys.svn_date = pool_intern("svn:date");
 101         keys.svn_executable = pool_intern("svn:executable");
 102         keys.svn_special = pool_intern("svn:special");
 103         keys.uuid = pool_intern("UUID");
 104         keys.revision_number = pool_intern("Revision-number");
 105         keys.node_path = pool_intern("Node-path");
 106         keys.node_kind = pool_intern("Node-kind");
 107         keys.node_action = pool_intern("Node-action");
 108         keys.node_copyfrom_path = pool_intern("Node-copyfrom-path");
 109         keys.node_copyfrom_rev = pool_intern("Node-copyfrom-rev");
 110         keys.text_content_length = pool_intern("Text-content-length");
 111         keys.prop_content_length = pool_intern("Prop-content-length");
 112         keys.content_length = pool_intern("Content-length");
 113         keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
 114         /* version 3 format (Subversion 1.1.0) */
 115         keys.text_delta = pool_intern("Text-delta");
 116         keys.prop_delta = pool_intern("Prop-delta");
 117 }
 118
 119 static void read_props(void)
 120 {
 121         uint32_t len;
 122         uint32_t key = ~0;
 123         char *val = NULL;
 124         char *t;
 125         while ((t = buffer_read_line()) && strcmp(t, "PROPS-END")) {
 126                 if (!strncmp(t, "K ", 2)) {
 127                         len = atoi(&t[2]);
 128                         key = pool_intern(buffer_read_string(len));
 129                         buffer_read_line();
 130                 } else if (!strncmp(t, "V ", 2)) {
 131                         len = atoi(&t[2]);
 132                         val = buffer_read_string(len);
 133                         if (key == keys.svn_log) {
 134                                 /* Value length excludes terminating nul. */
 135                                 rev_ctx.log = log_copy(len + 1, val);
 136                         } else if (key == keys.svn_author) {
 137                                 rev_ctx.author = pool_intern(val);
 138                         } else if (key == keys.svn_date) {
 139                                 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
 140                                         fprintf(stderr, "Invalid timestamp: %s\n", val);
 141                         } else if (key == keys.svn_executable) {
 142                                 node_ctx.type = REPO_MODE_EXE;
 143                         } else if (key == keys.svn_special) {
 144                                 node_ctx.type = REPO_MODE_LNK;
 145                         }
 146                         key = ~0;
 147                         buffer_read_line();
 148                 }
 149         }
 150 }
 151
 152 static void handle_node(void)
 153 {
 154         uint32_t old_mode = 0;
 155
 156         if (node_ctx.text_delta || node_ctx.prop_delta)
 157                 die("text and property deltas not supported");
 158
 159         if (node_ctx.propLength != LENGTH_UNKNOWN && node_ctx.propLength)
 160                 read_props();
 161
 162         if (node_ctx.srcRev)
 163                 old_mode = repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
 164
 165         if (node_ctx.textLength != LENGTH_UNKNOWN &&
 166             node_ctx.type != REPO_MODE_DIR)
 167                 node_ctx.mark = next_blob_mark();
 168
 169         if (node_ctx.action == NODEACT_DELETE) {
 170                 repo_delete(node_ctx.dst);
 171         } else if (node_ctx.action == NODEACT_CHANGE ||
 172                            node_ctx.action == NODEACT_REPLACE) {
 173                 if (node_ctx.action == NODEACT_REPLACE &&
 174                     node_ctx.type == REPO_MODE_DIR)
 175                         repo_replace(node_ctx.dst, node_ctx.mark);
 176                 else if (node_ctx.propLength != LENGTH_UNKNOWN)
 177                         repo_modify(node_ctx.dst, node_ctx.type, node_ctx.mark);
 178                 else if (node_ctx.textLength != LENGTH_UNKNOWN)
 179                         old_mode = repo_replace(node_ctx.dst, node_ctx.mark);
 180         } else if (node_ctx.action == NODEACT_ADD) {
 181                 if (node_ctx.srcRev && node_ctx.propLength != LENGTH_UNKNOWN)
 182                         repo_modify(node_ctx.dst, node_ctx.type, node_ctx.mark);
 183                 else if (node_ctx.srcRev && node_ctx.textLength != LENGTH_UNKNOWN)
 184                         old_mode = repo_replace(node_ctx.dst, node_ctx.mark);
 185                 else if ((node_ctx.type == REPO_MODE_DIR && !node_ctx.srcRev) ||
 186                          node_ctx.textLength != LENGTH_UNKNOWN)
 187                         repo_add(node_ctx.dst, node_ctx.type, node_ctx.mark);
 188         }
 189
 190         if (node_ctx.propLength == LENGTH_UNKNOWN && old_mode)
 191                 node_ctx.type = old_mode;
 192
 193         if (node_ctx.mark)
 194                 fast_export_blob(node_ctx.type, node_ctx.mark, node_ctx.textLength);
 195         else if (node_ctx.textLength != LENGTH_UNKNOWN)
 196                 buffer_skip_bytes(node_ctx.textLength);
 197 }
 198
 199 static void handle_revision(void)
 200 {
 201         if (rev_ctx.revision)
 202                 repo_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
 203                         dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
 204 }
 205
 206 void svndump_read(const char *url)
 207 {
 208         char *val;
 209         char *t;
 210         uint32_t active_ctx = DUMP_CTX;
 211         uint32_t len;
 212         uint32_t key;
 213
 214         reset_dump_ctx(pool_intern(url));
 215         while ((t = buffer_read_line())) {
 216                 val = strstr(t, ": ");
 217                 if (!val)
 218                         continue;
 219                 *val++ = '\0';
 220                 *val++ = '\0';
 221                 key = pool_intern(t);
 222
 223                 if (key == keys.svn_fs_dump_format_version) {
 224                         dump_ctx.version = atoi(val);
 225                         if (dump_ctx.version > 3)
 226                                 die("expected svn dump format version <= 3, found %d",
 227                                     dump_ctx.version);
 228                 } else if (key == keys.uuid) {
 229                         dump_ctx.uuid = pool_intern(val);
 230                 } else if (key == keys.revision_number) {
 231                         if (active_ctx == NODE_CTX)
 232                                 handle_node();
 233                         if (active_ctx != DUMP_CTX)
 234                                 handle_revision();
 235                         active_ctx = REV_CTX;
 236                         reset_rev_ctx(atoi(val));
 237                 } else if (key == keys.node_path) {
 238                         if (active_ctx == NODE_CTX)
 239                                 handle_node();
 240                         active_ctx = NODE_CTX;
 241                         reset_node_ctx(val);
 242                 } else if (key == keys.node_kind) {
 243                         if (!strcmp(val, "dir"))
 244                                 node_ctx.type = REPO_MODE_DIR;
 245                         else if (!strcmp(val, "file"))
 246                                 node_ctx.type = REPO_MODE_BLB;
 247                         else
 248                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
 249                 } else if (key == keys.node_action) {
 250                         if (!strcmp(val, "delete")) {
 251                                 node_ctx.action = NODEACT_DELETE;
 252                         } else if (!strcmp(val, "add")) {
 253                                 node_ctx.action = NODEACT_ADD;
 254                         } else if (!strcmp(val, "change")) {
 255                                 node_ctx.action = NODEACT_CHANGE;
 256                         } else if (!strcmp(val, "replace")) {
 257                                 node_ctx.action = NODEACT_REPLACE;
 258                         } else {
 259                                 fprintf(stderr, "Unknown node-action: %s\n", val);
 260                                 node_ctx.action = NODEACT_UNKNOWN;
 261                         }
 262                 } else if (key == keys.node_copyfrom_path) {
 263                         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
 264                 } else if (key == keys.node_copyfrom_rev) {
 265                         node_ctx.srcRev = atoi(val);
 266                 } else if (key == keys.text_content_length) {
 267                         node_ctx.textLength = atoi(val);
 268                 } else if (key == keys.prop_content_length) {
 269                         node_ctx.propLength = atoi(val);
 270                 } else if (key == keys.text_delta) {
 271                         node_ctx.text_delta = !strcmp(val, "true");
 272                 } else if (key == keys.prop_delta) {
 273                         node_ctx.prop_delta = !strcmp(val, "true");
 274                 } else if (key == keys.content_length) {
 275                         len = atoi(val);
 276                         buffer_read_line();
 277                         if (active_ctx == REV_CTX) {
 278                                 read_props();
 279                         } else if (active_ctx == NODE_CTX) {
 280                                 handle_node();
 281                                 active_ctx = REV_CTX;
 282                         } else {
 283                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
 284                                 buffer_skip_bytes(len);
 285                         }
 286                 }
 287         }
 288         if (active_ctx == NODE_CTX)
 289                 handle_node();
 290         if (active_ctx != DUMP_CTX)
 291                 handle_revision();
 292 }
 293
 294 int svndump_init(const char *filename)
 295 {
 296         if (buffer_init(filename))
 297                 return error("cannot open %s: %s", filename, strerror(errno));
 298         repo_init();
 299         reset_dump_ctx(~0);
 300         reset_rev_ctx(0);
 301         reset_node_ctx(NULL);
 302         init_keys();
 303         return 0;
 304 }
 305
 306 void svndump_deinit(void)
 307 {
 308         log_reset();
 309         repo_reset();
 310         reset_dump_ctx(~0);
 311         reset_rev_ctx(0);
 312         reset_node_ctx(NULL);
 313         if (buffer_deinit())
 314                 fprintf(stderr, "Input error\n");
 315         if (ferror(stdout))
 316                 fprintf(stderr, "Output error\n");
 317 }
 318
 319 void svndump_reset(void)
 320 {
 321         log_reset();
 322         buffer_reset();
 323         repo_reset();
 324         reset_dump_ctx(~0);
 325         reset_rev_ctx(0);
 326         reset_node_ctx(NULL);
 327 }