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 "string_pool.h"
15#include "strbuf.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
39static struct line_buffer input = LINE_BUFFER_INIT;
41static struct {
43 uint32_t action, propLength, textLength, srcRev, type;
44 uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
45 uint32_t text_delta, prop_delta;
46} node_ctx;
47static struct {
49 uint32_t revision;
50 unsigned long timestamp;
51 struct strbuf log, author;
52} rev_ctx;
53static struct {
55 uint32_t version;
56 struct strbuf uuid, url;
57} dump_ctx;
58static void reset_node_ctx(char *fname)
60{
61 node_ctx.type = 0;
62 node_ctx.action = NODEACT_UNKNOWN;
63 node_ctx.propLength = LENGTH_UNKNOWN;
64 node_ctx.textLength = LENGTH_UNKNOWN;
65 node_ctx.src[0] = ~0;
66 node_ctx.srcRev = 0;
67 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
68 node_ctx.text_delta = 0;
69 node_ctx.prop_delta = 0;
70}
71static void reset_rev_ctx(uint32_t revision)
73{
74 rev_ctx.revision = revision;
75 rev_ctx.timestamp = 0;
76 strbuf_reset(&rev_ctx.log);
77 strbuf_reset(&rev_ctx.author);
78}
79static void reset_dump_ctx(const char *url)
81{
82 strbuf_reset(&dump_ctx.url);
83 if (url)
84 strbuf_addstr(&dump_ctx.url, url);
85 dump_ctx.version = 1;
86 strbuf_reset(&dump_ctx.uuid);
87}
88static void handle_property(const struct strbuf *key_buf,
90 const char *val, uint32_t len,
91 uint32_t *type_set)
92{
93 const char *key = key_buf->buf;
94 size_t keylen = key_buf->len;
95 switch (keylen + 1) {
97 case sizeof("svn:log"):
98 if (constcmp(key, "svn:log"))
99 break;
100 if (!val)
101 die("invalid dump: unsets svn:log");
102 strbuf_reset(&rev_ctx.log);
103 strbuf_add(&rev_ctx.log, val, len);
104 break;
105 case sizeof("svn:author"):
106 if (constcmp(key, "svn:author"))
107 break;
108 strbuf_reset(&rev_ctx.author);
109 if (val)
110 strbuf_add(&rev_ctx.author, val, len);
111 break;
112 case sizeof("svn:date"):
113 if (constcmp(key, "svn:date"))
114 break;
115 if (!val)
116 die("invalid dump: unsets svn:date");
117 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
118 warning("invalid timestamp: %s", val);
119 break;
120 case sizeof("svn:executable"):
121 case sizeof("svn:special"):
122 if (keylen == strlen("svn:executable") &&
123 constcmp(key, "svn:executable"))
124 break;
125 if (keylen == strlen("svn:special") &&
126 constcmp(key, "svn:special"))
127 break;
128 if (*type_set) {
129 if (!val)
130 return;
131 die("invalid dump: sets type twice");
132 }
133 if (!val) {
134 node_ctx.type = REPO_MODE_BLB;
135 return;
136 }
137 *type_set = 1;
138 node_ctx.type = keylen == strlen("svn:executable") ?
139 REPO_MODE_EXE :
140 REPO_MODE_LNK;
141 }
142}
143static void die_short_read(void)
145{
146 if (buffer_ferror(&input))
147 die_errno("error reading dump file");
148 die("invalid dump: unexpected end of file");
149}
150static void read_props(void)
152{
153 static struct strbuf key = STRBUF_INIT;
154 const char *t;
155 /*
156 * NEEDSWORK: to support simple mode changes like
157 * K 11
158 * svn:special
159 * V 1
160 * *
161 * D 14
162 * svn:executable
163 * we keep track of whether a mode has been set and reset to
164 * plain file only if not. We should be keeping track of the
165 * symlink and executable bits separately instead.
166 */
167 uint32_t type_set = 0;
168 while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
169 uint32_t len;
170 const char *val;
171 const char type = t[0];
172 int ch;
173 if (!type || t[1] != ' ')
175 die("invalid property line: %s\n", t);
176 len = atoi(&t[2]);
177 val = buffer_read_string(&input, len);
178 if (!val || strlen(val) != len)
179 die_short_read();
180 /* Discard trailing newline. */
182 ch = buffer_read_char(&input);
183 if (ch == EOF)
184 die_short_read();
185 if (ch != '\n')
186 die("invalid dump: expected newline after %s", val);
187 switch (type) {
189 case 'K':
190 case 'D':
191 strbuf_reset(&key);
192 if (val)
193 strbuf_add(&key, val, len);
194 if (type == 'K')
195 continue;
196 assert(type == 'D');
197 val = NULL;
198 len = 0;
199 /* fall through */
200 case 'V':
201 handle_property(&key, val, len, &type_set);
202 strbuf_reset(&key);
203 continue;
204 default:
205 die("invalid property line: %s\n", t);
206 }
207 }
208}
209static void handle_node(void)
211{
212 const uint32_t type = node_ctx.type;
213 const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
214 const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
215 /*
216 * Old text for this node:
217 * NULL - directory or bug
218 * empty_blob - empty
219 * "<dataref>" - data retrievable from fast-import
220 */
221 static const char *const empty_blob = "::empty::";
222 const char *old_data = NULL;
223 if (node_ctx.text_delta)
225 die("text deltas not supported");
226 if (node_ctx.action == NODEACT_DELETE) {
228 if (have_text || have_props || node_ctx.srcRev)
229 die("invalid dump: deletion node has "
230 "copyfrom info, text, or properties");
231 return repo_delete(node_ctx.dst);
232 }
233 if (node_ctx.action == NODEACT_REPLACE) {
234 repo_delete(node_ctx.dst);
235 node_ctx.action = NODEACT_ADD;
236 }
237 if (node_ctx.srcRev) {
238 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
239 if (node_ctx.action == NODEACT_ADD)
240 node_ctx.action = NODEACT_CHANGE;
241 }
242 if (have_text && type == REPO_MODE_DIR)
243 die("invalid dump: directories cannot have text attached");
244 /*
246 * Find old content (old_data) and decide on the new mode.
247 */
248 if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
249 if (type != REPO_MODE_DIR)
250 die("invalid dump: root of tree is not a regular file");
251 old_data = NULL;
252 } else if (node_ctx.action == NODEACT_CHANGE) {
253 uint32_t mode;
254 old_data = repo_read_path(node_ctx.dst);
255 mode = repo_read_mode(node_ctx.dst);
256 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
257 die("invalid dump: cannot modify a directory into a file");
258 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
259 die("invalid dump: cannot modify a file into a directory");
260 node_ctx.type = mode;
261 } else if (node_ctx.action == NODEACT_ADD) {
262 if (type == REPO_MODE_DIR)
263 old_data = NULL;
264 else if (have_text)
265 old_data = empty_blob;
266 else
267 die("invalid dump: adds node without text");
268 } else {
269 die("invalid dump: Node-path block lacks Node-action");
270 }
271 /*
273 * Adjust mode to reflect properties.
274 */
275 if (have_props) {
276 if (!node_ctx.prop_delta)
277 node_ctx.type = type;
278 if (node_ctx.propLength)
279 read_props();
280 }
281 /*
283 * Save the result.
284 */
285 if (type == REPO_MODE_DIR) /* directories are not tracked. */
286 return;
287 assert(old_data);
288 if (old_data == empty_blob)
289 /* For the fast_export_* functions, NULL means empty. */
290 old_data = NULL;
291 if (!have_text) {
292 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
293 node_ctx.type, old_data);
294 return;
295 }
296 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
297 node_ctx.type, "inline");
298 fast_export_data(node_ctx.type, node_ctx.textLength, &input);
299}
300static void begin_revision(void)
302{
303 if (!rev_ctx.revision) /* revision 0 gets no git commit. */
304 return;
305 fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
306 rev_ctx.log.buf, dump_ctx.uuid.buf, dump_ctx.url.buf,
307 rev_ctx.timestamp);
308}
309static void end_revision(void)
311{
312 if (rev_ctx.revision)
313 fast_export_end_commit(rev_ctx.revision);
314}
315void svndump_read(const char *url)
317{
318 char *val;
319 char *t;
320 uint32_t active_ctx = DUMP_CTX;
321 uint32_t len;
322 reset_dump_ctx(url);
324 while ((t = buffer_read_line(&input))) {
325 val = strstr(t, ": ");
326 if (!val)
327 continue;
328 val += 2;
329 /* strlen(key) + 1 */
331 switch (val - t - 1) {
332 case sizeof("SVN-fs-dump-format-version"):
333 if (constcmp(t, "SVN-fs-dump-format-version"))
334 continue;
335 dump_ctx.version = atoi(val);
336 if (dump_ctx.version > 3)
337 die("expected svn dump format version <= 3, found %"PRIu32,
338 dump_ctx.version);
339 break;
340 case sizeof("UUID"):
341 if (constcmp(t, "UUID"))
342 continue;
343 strbuf_reset(&dump_ctx.uuid);
344 strbuf_addstr(&dump_ctx.uuid, val);
345 break;
346 case sizeof("Revision-number"):
347 if (constcmp(t, "Revision-number"))
348 continue;
349 if (active_ctx == NODE_CTX)
350 handle_node();
351 if (active_ctx == REV_CTX)
352 begin_revision();
353 if (active_ctx != DUMP_CTX)
354 end_revision();
355 active_ctx = REV_CTX;
356 reset_rev_ctx(atoi(val));
357 break;
358 case sizeof("Node-path"):
359 if (prefixcmp(t, "Node-"))
360 continue;
361 if (!constcmp(t + strlen("Node-"), "path")) {
362 if (active_ctx == NODE_CTX)
363 handle_node();
364 if (active_ctx == REV_CTX)
365 begin_revision();
366 active_ctx = NODE_CTX;
367 reset_node_ctx(val);
368 break;
369 }
370 if (constcmp(t + strlen("Node-"), "kind"))
371 continue;
372 if (!strcmp(val, "dir"))
373 node_ctx.type = REPO_MODE_DIR;
374 else if (!strcmp(val, "file"))
375 node_ctx.type = REPO_MODE_BLB;
376 else
377 fprintf(stderr, "Unknown node-kind: %s\n", val);
378 break;
379 case sizeof("Node-action"):
380 if (constcmp(t, "Node-action"))
381 continue;
382 if (!strcmp(val, "delete")) {
383 node_ctx.action = NODEACT_DELETE;
384 } else if (!strcmp(val, "add")) {
385 node_ctx.action = NODEACT_ADD;
386 } else if (!strcmp(val, "change")) {
387 node_ctx.action = NODEACT_CHANGE;
388 } else if (!strcmp(val, "replace")) {
389 node_ctx.action = NODEACT_REPLACE;
390 } else {
391 fprintf(stderr, "Unknown node-action: %s\n", val);
392 node_ctx.action = NODEACT_UNKNOWN;
393 }
394 break;
395 case sizeof("Node-copyfrom-path"):
396 if (constcmp(t, "Node-copyfrom-path"))
397 continue;
398 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
399 break;
400 case sizeof("Node-copyfrom-rev"):
401 if (constcmp(t, "Node-copyfrom-rev"))
402 continue;
403 node_ctx.srcRev = atoi(val);
404 break;
405 case sizeof("Text-content-length"):
406 if (!constcmp(t, "Text-content-length")) {
407 node_ctx.textLength = atoi(val);
408 break;
409 }
410 if (constcmp(t, "Prop-content-length"))
411 continue;
412 node_ctx.propLength = atoi(val);
413 break;
414 case sizeof("Text-delta"):
415 if (!constcmp(t, "Text-delta")) {
416 node_ctx.text_delta = !strcmp(val, "true");
417 break;
418 }
419 if (constcmp(t, "Prop-delta"))
420 continue;
421 node_ctx.prop_delta = !strcmp(val, "true");
422 break;
423 case sizeof("Content-length"):
424 if (constcmp(t, "Content-length"))
425 continue;
426 len = atoi(val);
427 t = buffer_read_line(&input);
428 if (!t)
429 die_short_read();
430 if (*t)
431 die("invalid dump: expected blank line after content length header");
432 if (active_ctx == REV_CTX) {
433 read_props();
434 } else if (active_ctx == NODE_CTX) {
435 handle_node();
436 active_ctx = INTERNODE_CTX;
437 } else {
438 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
439 if (buffer_skip_bytes(&input, len) != len)
440 die_short_read();
441 }
442 }
443 }
444 if (buffer_ferror(&input))
445 die_short_read();
446 if (active_ctx == NODE_CTX)
447 handle_node();
448 if (active_ctx == REV_CTX)
449 begin_revision();
450 if (active_ctx != DUMP_CTX)
451 end_revision();
452}
453int svndump_init(const char *filename)
455{
456 if (buffer_init(&input, filename))
457 return error("cannot open %s: %s", filename, strerror(errno));
458 fast_export_init(REPORT_FILENO);
459 strbuf_init(&dump_ctx.uuid, 4096);
460 strbuf_init(&dump_ctx.url, 4096);
461 strbuf_init(&rev_ctx.log, 4096);
462 strbuf_init(&rev_ctx.author, 4096);
463 reset_dump_ctx(NULL);
464 reset_rev_ctx(0);
465 reset_node_ctx(NULL);
466 return 0;
467}
468void svndump_deinit(void)
470{
471 fast_export_deinit();
472 reset_dump_ctx(NULL);
473 reset_rev_ctx(0);
474 reset_node_ctx(NULL);
475 strbuf_release(&rev_ctx.log);
476 if (buffer_deinit(&input))
477 fprintf(stderr, "Input error\n");
478 if (ferror(stdout))
479 fprintf(stderr, "Output error\n");
480}
481void svndump_reset(void)
483{
484 fast_export_reset();
485 buffer_reset(&input);
486 strbuf_release(&dump_ctx.uuid);
487 strbuf_release(&dump_ctx.url);
488 strbuf_release(&rev_ctx.log);
489 strbuf_release(&rev_ctx.author);
490}