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#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#define REPORT_FILENO 3
18/*
20 * Compare start of string to literal of equal length;
21 * must be guarded by length test.
22 */
23#define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
24#define NODEACT_REPLACE 4
26#define NODEACT_DELETE 3
27#define NODEACT_ADD 2
28#define NODEACT_CHANGE 1
29#define NODEACT_UNKNOWN 0
30/* States: */
32#define DUMP_CTX 0 /* dump metadata */
33#define REV_CTX 1 /* revision metadata */
34#define NODE_CTX 2 /* node metadata */
35#define INTERNODE_CTX 3 /* between nodes */
36#define LENGTH_UNKNOWN (~0)
38#define DATE_RFC2822_LEN 31
39/* Create memory pool for log messages */
41obj_pool_gen(log, char, 4096)
42static struct line_buffer input = LINE_BUFFER_INIT;
44#define REPORT_FILENO 3
46static char *log_copy(uint32_t length, const char *log)
48{
49 char *buffer;
50 log_free(log_pool.size);
51 buffer = log_pointer(log_alloc(length));
52 strncpy(buffer, log, length);
53 return buffer;
54}
55static struct {
57 uint32_t action, propLength, textLength, srcRev, type;
58 uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
59 uint32_t text_delta, prop_delta;
60} node_ctx;
61static struct {
63 uint32_t revision, author;
64 unsigned long timestamp;
65 char *log;
66} rev_ctx;
67static struct {
69 uint32_t version, uuid, url;
70} dump_ctx;
71static void reset_node_ctx(char *fname)
73{
74 node_ctx.type = 0;
75 node_ctx.action = NODEACT_UNKNOWN;
76 node_ctx.propLength = LENGTH_UNKNOWN;
77 node_ctx.textLength = LENGTH_UNKNOWN;
78 node_ctx.src[0] = ~0;
79 node_ctx.srcRev = 0;
80 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
81 node_ctx.text_delta = 0;
82 node_ctx.prop_delta = 0;
83}
84static void reset_rev_ctx(uint32_t revision)
86{
87 rev_ctx.revision = revision;
88 rev_ctx.timestamp = 0;
89 rev_ctx.log = NULL;
90 rev_ctx.author = ~0;
91}
92static void reset_dump_ctx(uint32_t url)
94{
95 dump_ctx.url = url;
96 dump_ctx.version = 1;
97 dump_ctx.uuid = ~0;
98}
99static void handle_property(const struct strbuf *key_buf,
101 const char *val, uint32_t len,
102 uint32_t *type_set)
103{
104 const char *key = key_buf->buf;
105 size_t keylen = key_buf->len;
106 switch (keylen + 1) {
108 case sizeof("svn:log"):
109 if (constcmp(key, "svn:log"))
110 break;
111 if (!val)
112 die("invalid dump: unsets svn:log");
113 /* Value length excludes terminating nul. */
114 rev_ctx.log = log_copy(len + 1, val);
115 break;
116 case sizeof("svn:author"):
117 if (constcmp(key, "svn:author"))
118 break;
119 rev_ctx.author = pool_intern(val);
120 break;
121 case sizeof("svn:date"):
122 if (constcmp(key, "svn:date"))
123 break;
124 if (!val)
125 die("invalid dump: unsets svn:date");
126 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
127 warning("invalid timestamp: %s", val);
128 break;
129 case sizeof("svn:executable"):
130 case sizeof("svn:special"):
131 if (keylen == strlen("svn:executable") &&
132 constcmp(key, "svn:executable"))
133 break;
134 if (keylen == strlen("svn:special") &&
135 constcmp(key, "svn:special"))
136 break;
137 if (*type_set) {
138 if (!val)
139 return;
140 die("invalid dump: sets type twice");
141 }
142 if (!val) {
143 node_ctx.type = REPO_MODE_BLB;
144 return;
145 }
146 *type_set = 1;
147 node_ctx.type = keylen == strlen("svn:executable") ?
148 REPO_MODE_EXE :
149 REPO_MODE_LNK;
150 }
151}
152static void die_short_read(void)
154{
155 if (buffer_ferror(&input))
156 die_errno("error reading dump file");
157 die("invalid dump: unexpected end of file");
158}
159static void read_props(void)
161{
162 static struct strbuf key = STRBUF_INIT;
163 const char *t;
164 /*
165 * NEEDSWORK: to support simple mode changes like
166 * K 11
167 * svn:special
168 * V 1
169 * *
170 * D 14
171 * svn:executable
172 * we keep track of whether a mode has been set and reset to
173 * plain file only if not. We should be keeping track of the
174 * symlink and executable bits separately instead.
175 */
176 uint32_t type_set = 0;
177 while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
178 uint32_t len;
179 const char *val;
180 const char type = t[0];
181 int ch;
182 if (!type || t[1] != ' ')
184 die("invalid property line: %s\n", t);
185 len = atoi(&t[2]);
186 val = buffer_read_string(&input, len);
187 if (!val || strlen(val) != len)
188 die_short_read();
189 /* Discard trailing newline. */
191 ch = buffer_read_char(&input);
192 if (ch == EOF)
193 die_short_read();
194 if (ch != '\n')
195 die("invalid dump: expected newline after %s", val);
196 switch (type) {
198 case 'K':
199 case 'D':
200 strbuf_reset(&key);
201 if (val)
202 strbuf_add(&key, val, len);
203 if (type == 'K')
204 continue;
205 assert(type == 'D');
206 val = NULL;
207 len = 0;
208 /* fall through */
209 case 'V':
210 handle_property(&key, val, len, &type_set);
211 strbuf_reset(&key);
212 continue;
213 default:
214 die("invalid property line: %s\n", t);
215 }
216 }
217}
218static void handle_node(void)
220{
221 const uint32_t type = node_ctx.type;
222 const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
223 const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
224 /*
225 * Old text for this node:
226 * NULL - directory or bug
227 * empty_blob - empty
228 * "<dataref>" - data retrievable from fast-import
229 */
230 static const char *const empty_blob = "::empty::";
231 const char *old_data = NULL;
232 if (node_ctx.text_delta)
234 die("text deltas not supported");
235 if (node_ctx.action == NODEACT_DELETE) {
237 if (have_text || have_props || node_ctx.srcRev)
238 die("invalid dump: deletion node has "
239 "copyfrom info, text, or properties");
240 return repo_delete(node_ctx.dst);
241 }
242 if (node_ctx.action == NODEACT_REPLACE) {
243 repo_delete(node_ctx.dst);
244 node_ctx.action = NODEACT_ADD;
245 }
246 if (node_ctx.srcRev) {
247 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
248 if (node_ctx.action == NODEACT_ADD)
249 node_ctx.action = NODEACT_CHANGE;
250 }
251 if (have_text && type == REPO_MODE_DIR)
252 die("invalid dump: directories cannot have text attached");
253 /*
255 * Find old content (old_data) and decide on the new mode.
256 */
257 if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
258 if (type != REPO_MODE_DIR)
259 die("invalid dump: root of tree is not a regular file");
260 old_data = NULL;
261 } else if (node_ctx.action == NODEACT_CHANGE) {
262 uint32_t mode;
263 old_data = repo_read_path(node_ctx.dst);
264 mode = repo_read_mode(node_ctx.dst);
265 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
266 die("invalid dump: cannot modify a directory into a file");
267 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
268 die("invalid dump: cannot modify a file into a directory");
269 node_ctx.type = mode;
270 } else if (node_ctx.action == NODEACT_ADD) {
271 if (type == REPO_MODE_DIR)
272 old_data = NULL;
273 else if (have_text)
274 old_data = empty_blob;
275 else
276 die("invalid dump: adds node without text");
277 } else {
278 die("invalid dump: Node-path block lacks Node-action");
279 }
280 /*
282 * Adjust mode to reflect properties.
283 */
284 if (have_props) {
285 if (!node_ctx.prop_delta)
286 node_ctx.type = type;
287 if (node_ctx.propLength)
288 read_props();
289 }
290 /*
292 * Save the result.
293 */
294 if (type == REPO_MODE_DIR) /* directories are not tracked. */
295 return;
296 assert(old_data);
297 if (old_data == empty_blob)
298 /* For the fast_export_* functions, NULL means empty. */
299 old_data = NULL;
300 if (!have_text) {
301 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
302 node_ctx.type, old_data);
303 return;
304 }
305 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
306 node_ctx.type, "inline");
307 fast_export_data(node_ctx.type, node_ctx.textLength, &input);
308}
309static void begin_revision(void)
311{
312 if (!rev_ctx.revision) /* revision 0 gets no git commit. */
313 return;
314 fast_export_begin_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
315 dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
316}
317static void end_revision(void)
319{
320 if (rev_ctx.revision)
321 fast_export_end_commit(rev_ctx.revision);
322}
323void svndump_read(const char *url)
325{
326 char *val;
327 char *t;
328 uint32_t active_ctx = DUMP_CTX;
329 uint32_t len;
330 reset_dump_ctx(pool_intern(url));
332 while ((t = buffer_read_line(&input))) {
333 val = strstr(t, ": ");
334 if (!val)
335 continue;
336 val += 2;
337 /* strlen(key) + 1 */
339 switch (val - t - 1) {
340 case sizeof("SVN-fs-dump-format-version"):
341 if (constcmp(t, "SVN-fs-dump-format-version"))
342 continue;
343 dump_ctx.version = atoi(val);
344 if (dump_ctx.version > 3)
345 die("expected svn dump format version <= 3, found %"PRIu32,
346 dump_ctx.version);
347 break;
348 case sizeof("UUID"):
349 if (constcmp(t, "UUID"))
350 continue;
351 dump_ctx.uuid = pool_intern(val);
352 break;
353 case sizeof("Revision-number"):
354 if (constcmp(t, "Revision-number"))
355 continue;
356 if (active_ctx == NODE_CTX)
357 handle_node();
358 if (active_ctx == REV_CTX)
359 begin_revision();
360 if (active_ctx != DUMP_CTX)
361 end_revision();
362 active_ctx = REV_CTX;
363 reset_rev_ctx(atoi(val));
364 break;
365 case sizeof("Node-path"):
366 if (prefixcmp(t, "Node-"))
367 continue;
368 if (!constcmp(t + strlen("Node-"), "path")) {
369 if (active_ctx == NODE_CTX)
370 handle_node();
371 if (active_ctx == REV_CTX)
372 begin_revision();
373 active_ctx = NODE_CTX;
374 reset_node_ctx(val);
375 break;
376 }
377 if (constcmp(t + strlen("Node-"), "kind"))
378 continue;
379 if (!strcmp(val, "dir"))
380 node_ctx.type = REPO_MODE_DIR;
381 else if (!strcmp(val, "file"))
382 node_ctx.type = REPO_MODE_BLB;
383 else
384 fprintf(stderr, "Unknown node-kind: %s\n", val);
385 break;
386 case sizeof("Node-action"):
387 if (constcmp(t, "Node-action"))
388 continue;
389 if (!strcmp(val, "delete")) {
390 node_ctx.action = NODEACT_DELETE;
391 } else if (!strcmp(val, "add")) {
392 node_ctx.action = NODEACT_ADD;
393 } else if (!strcmp(val, "change")) {
394 node_ctx.action = NODEACT_CHANGE;
395 } else if (!strcmp(val, "replace")) {
396 node_ctx.action = NODEACT_REPLACE;
397 } else {
398 fprintf(stderr, "Unknown node-action: %s\n", val);
399 node_ctx.action = NODEACT_UNKNOWN;
400 }
401 break;
402 case sizeof("Node-copyfrom-path"):
403 if (constcmp(t, "Node-copyfrom-path"))
404 continue;
405 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
406 break;
407 case sizeof("Node-copyfrom-rev"):
408 if (constcmp(t, "Node-copyfrom-rev"))
409 continue;
410 node_ctx.srcRev = atoi(val);
411 break;
412 case sizeof("Text-content-length"):
413 if (!constcmp(t, "Text-content-length")) {
414 node_ctx.textLength = atoi(val);
415 break;
416 }
417 if (constcmp(t, "Prop-content-length"))
418 continue;
419 node_ctx.propLength = atoi(val);
420 break;
421 case sizeof("Text-delta"):
422 if (!constcmp(t, "Text-delta")) {
423 node_ctx.text_delta = !strcmp(val, "true");
424 break;
425 }
426 if (constcmp(t, "Prop-delta"))
427 continue;
428 node_ctx.prop_delta = !strcmp(val, "true");
429 break;
430 case sizeof("Content-length"):
431 if (constcmp(t, "Content-length"))
432 continue;
433 len = atoi(val);
434 t = buffer_read_line(&input);
435 if (!t)
436 die_short_read();
437 if (*t)
438 die("invalid dump: expected blank line after content length header");
439 if (active_ctx == REV_CTX) {
440 read_props();
441 } else if (active_ctx == NODE_CTX) {
442 handle_node();
443 active_ctx = INTERNODE_CTX;
444 } else {
445 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
446 if (buffer_skip_bytes(&input, len) != len)
447 die_short_read();
448 }
449 }
450 }
451 if (buffer_ferror(&input))
452 die_short_read();
453 if (active_ctx == NODE_CTX)
454 handle_node();
455 if (active_ctx == REV_CTX)
456 begin_revision();
457 if (active_ctx != DUMP_CTX)
458 end_revision();
459}
460int svndump_init(const char *filename)
462{
463 if (buffer_init(&input, filename))
464 return error("cannot open %s: %s", filename, strerror(errno));
465 fast_export_init(REPORT_FILENO);
466 reset_dump_ctx(~0);
467 reset_rev_ctx(0);
468 reset_node_ctx(NULL);
469 return 0;
470}
471void svndump_deinit(void)
473{
474 log_reset();
475 fast_export_deinit();
476 reset_dump_ctx(~0);
477 reset_rev_ctx(0);
478 reset_node_ctx(NULL);
479 if (buffer_deinit(&input))
480 fprintf(stderr, "Input error\n");
481 if (ferror(stdout))
482 fprintf(stderr, "Output error\n");
483}
484void svndump_reset(void)
486{
487 log_reset();
488 fast_export_reset();
489 buffer_reset(&input);
490 reset_dump_ctx(~0);
491 reset_rev_ctx(0);
492 reset_node_ctx(NULL);
493}