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