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#include "svndump.h"
17/*
19 * Compare start of string to literal of equal length;
20 * must be guarded by length test.
21 */
22#define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
23#define NODEACT_REPLACE 4
25#define NODEACT_DELETE 3
26#define NODEACT_ADD 2
27#define NODEACT_CHANGE 1
28#define NODEACT_UNKNOWN 0
29#define DUMP_CTX 0
31#define REV_CTX 1
32#define NODE_CTX 2
33#define LENGTH_UNKNOWN (~0)
35#define DATE_RFC2822_LEN 31
36static struct line_buffer input = LINE_BUFFER_INIT;
38static struct {
40 uint32_t action, propLength, textLength, srcRev, type;
41 uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
42 uint32_t text_delta, prop_delta;
43} node_ctx;
44static struct {
46 uint32_t revision;
47 unsigned long timestamp;
48 struct strbuf log, author;
49} rev_ctx;
50static struct {
52 uint32_t version;
53 struct strbuf uuid, url;
54} dump_ctx;
55static void reset_node_ctx(char *fname)
57{
58 node_ctx.type = 0;
59 node_ctx.action = NODEACT_UNKNOWN;
60 node_ctx.propLength = LENGTH_UNKNOWN;
61 node_ctx.textLength = LENGTH_UNKNOWN;
62 node_ctx.src[0] = ~0;
63 node_ctx.srcRev = 0;
64 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
65 node_ctx.text_delta = 0;
66 node_ctx.prop_delta = 0;
67}
68static void reset_rev_ctx(uint32_t revision)
70{
71 rev_ctx.revision = revision;
72 rev_ctx.timestamp = 0;
73 strbuf_reset(&rev_ctx.log);
74 strbuf_reset(&rev_ctx.author);
75}
76static void reset_dump_ctx(const char *url)
78{
79 strbuf_reset(&dump_ctx.url);
80 if (url)
81 strbuf_addstr(&dump_ctx.url, url);
82 dump_ctx.version = 1;
83 strbuf_reset(&dump_ctx.uuid);
84}
85static void handle_property(const struct strbuf *key_buf,
87 struct strbuf *val,
88 uint32_t *type_set)
89{
90 const char *key = key_buf->buf;
91 size_t keylen = key_buf->len;
92 switch (keylen + 1) {
94 case sizeof("svn:log"):
95 if (constcmp(key, "svn:log"))
96 break;
97 if (!val)
98 die("invalid dump: unsets svn:log");
99 strbuf_swap(&rev_ctx.log, val);
100 break;
101 case sizeof("svn:author"):
102 if (constcmp(key, "svn:author"))
103 break;
104 if (!val)
105 strbuf_reset(&rev_ctx.author);
106 else
107 strbuf_swap(&rev_ctx.author, val);
108 break;
109 case sizeof("svn:date"):
110 if (constcmp(key, "svn:date"))
111 break;
112 if (!val)
113 die("invalid dump: unsets svn:date");
114 if (parse_date_basic(val->buf, &rev_ctx.timestamp, NULL))
115 warning("invalid timestamp: %s", val->buf);
116 break;
117 case sizeof("svn:executable"):
118 case sizeof("svn:special"):
119 if (keylen == strlen("svn:executable") &&
120 constcmp(key, "svn:executable"))
121 break;
122 if (keylen == strlen("svn:special") &&
123 constcmp(key, "svn:special"))
124 break;
125 if (*type_set) {
126 if (!val)
127 return;
128 die("invalid dump: sets type twice");
129 }
130 if (!val) {
131 node_ctx.type = REPO_MODE_BLB;
132 return;
133 }
134 *type_set = 1;
135 node_ctx.type = keylen == strlen("svn:executable") ?
136 REPO_MODE_EXE :
137 REPO_MODE_LNK;
138 }
139}
140static void die_short_read(void)
142{
143 if (buffer_ferror(&input))
144 die_errno("error reading dump file");
145 die("invalid dump: unexpected end of file");
146}
147static void read_props(void)
149{
150 static struct strbuf key = STRBUF_INIT;
151 static struct strbuf val = STRBUF_INIT;
152 const char *t;
153 /*
154 * NEEDSWORK: to support simple mode changes like
155 * K 11
156 * svn:special
157 * V 1
158 * *
159 * D 14
160 * svn:executable
161 * we keep track of whether a mode has been set and reset to
162 * plain file only if not. We should be keeping track of the
163 * symlink and executable bits separately instead.
164 */
165 uint32_t type_set = 0;
166 while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
167 uint32_t len;
168 const char type = t[0];
169 int ch;
170 if (!type || t[1] != ' ')
172 die("invalid property line: %s\n", t);
173 len = atoi(&t[2]);
174 strbuf_reset(&val);
175 buffer_read_binary(&input, &val, len);
176 if (val.len < len)
177 die_short_read();
178 /* Discard trailing newline. */
180 ch = buffer_read_char(&input);
181 if (ch == EOF)
182 die_short_read();
183 if (ch != '\n')
184 die("invalid dump: expected newline after %s", val.buf);
185 switch (type) {
187 case 'K':
188 strbuf_swap(&key, &val);
189 continue;
190 case 'D':
191 handle_property(&val, NULL, &type_set);
192 continue;
193 case 'V':
194 handle_property(&key, &val, &type_set);
195 strbuf_reset(&key);
196 continue;
197 default:
198 die("invalid property line: %s\n", t);
199 }
200 }
201}
202static void handle_node(void)
204{
205 uint32_t mark = 0;
206 const uint32_t type = node_ctx.type;
207 const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
208 const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
209 if (node_ctx.text_delta)
211 die("text deltas not supported");
212 if (have_text)
213 mark = next_blob_mark();
214 if (node_ctx.action == NODEACT_DELETE) {
215 if (have_text || have_props || node_ctx.srcRev)
216 die("invalid dump: deletion node has "
217 "copyfrom info, text, or properties");
218 repo_delete(node_ctx.dst);
219 return;
220 }
221 if (node_ctx.action == NODEACT_REPLACE) {
222 repo_delete(node_ctx.dst);
223 node_ctx.action = NODEACT_ADD;
224 }
225 if (node_ctx.srcRev) {
226 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
227 if (node_ctx.action == NODEACT_ADD)
228 node_ctx.action = NODEACT_CHANGE;
229 }
230 if (have_text && type == REPO_MODE_DIR)
231 die("invalid dump: directories cannot have text attached");
232 /*
234 * Decide on the new content (mark) and mode (node_ctx.type).
235 */
236 if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
237 if (type != REPO_MODE_DIR)
238 die("invalid dump: root of tree is not a regular file");
239 } else if (node_ctx.action == NODEACT_CHANGE) {
240 uint32_t mode;
241 if (!have_text)
242 mark = repo_read_path(node_ctx.dst);
243 mode = repo_read_mode(node_ctx.dst);
244 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
245 die("invalid dump: cannot modify a directory into a file");
246 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
247 die("invalid dump: cannot modify a file into a directory");
248 node_ctx.type = mode;
249 } else if (node_ctx.action == NODEACT_ADD) {
250 if (!have_text && type != REPO_MODE_DIR)
251 die("invalid dump: adds node without text");
252 } else {
253 die("invalid dump: Node-path block lacks Node-action");
254 }
255 /*
257 * Adjust mode to reflect properties.
258 */
259 if (have_props) {
260 if (!node_ctx.prop_delta)
261 node_ctx.type = type;
262 if (node_ctx.propLength)
263 read_props();
264 }
265 /*
267 * Save the result.
268 */
269 repo_add(node_ctx.dst, node_ctx.type, mark);
270 if (have_text)
271 fast_export_blob(node_ctx.type, mark,
272 node_ctx.textLength, &input);
273}
274static void handle_revision(void)
276{
277 if (rev_ctx.revision)
278 repo_commit(rev_ctx.revision, rev_ctx.author.buf,
279 &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
280 rev_ctx.timestamp);
281}
282void svndump_read(const char *url)
284{
285 char *val;
286 char *t;
287 uint32_t active_ctx = DUMP_CTX;
288 uint32_t len;
289 reset_dump_ctx(url);
291 while ((t = buffer_read_line(&input))) {
292 val = strchr(t, ':');
293 if (!val)
294 continue;
295 val++;
296 if (*val != ' ')
297 continue;
298 val++;
299 /* strlen(key) + 1 */
301 switch (val - t - 1) {
302 case sizeof("SVN-fs-dump-format-version"):
303 if (constcmp(t, "SVN-fs-dump-format-version"))
304 continue;
305 dump_ctx.version = atoi(val);
306 if (dump_ctx.version > 3)
307 die("expected svn dump format version <= 3, found %"PRIu32,
308 dump_ctx.version);
309 break;
310 case sizeof("UUID"):
311 if (constcmp(t, "UUID"))
312 continue;
313 strbuf_reset(&dump_ctx.uuid);
314 strbuf_addstr(&dump_ctx.uuid, val);
315 break;
316 case sizeof("Revision-number"):
317 if (constcmp(t, "Revision-number"))
318 continue;
319 if (active_ctx == NODE_CTX)
320 handle_node();
321 if (active_ctx != DUMP_CTX)
322 handle_revision();
323 active_ctx = REV_CTX;
324 reset_rev_ctx(atoi(val));
325 break;
326 case sizeof("Node-path"):
327 if (prefixcmp(t, "Node-"))
328 continue;
329 if (!constcmp(t + strlen("Node-"), "path")) {
330 if (active_ctx == NODE_CTX)
331 handle_node();
332 active_ctx = NODE_CTX;
333 reset_node_ctx(val);
334 break;
335 }
336 if (constcmp(t + strlen("Node-"), "kind"))
337 continue;
338 if (!strcmp(val, "dir"))
339 node_ctx.type = REPO_MODE_DIR;
340 else if (!strcmp(val, "file"))
341 node_ctx.type = REPO_MODE_BLB;
342 else
343 fprintf(stderr, "Unknown node-kind: %s\n", val);
344 break;
345 case sizeof("Node-action"):
346 if (constcmp(t, "Node-action"))
347 continue;
348 if (!strcmp(val, "delete")) {
349 node_ctx.action = NODEACT_DELETE;
350 } else if (!strcmp(val, "add")) {
351 node_ctx.action = NODEACT_ADD;
352 } else if (!strcmp(val, "change")) {
353 node_ctx.action = NODEACT_CHANGE;
354 } else if (!strcmp(val, "replace")) {
355 node_ctx.action = NODEACT_REPLACE;
356 } else {
357 fprintf(stderr, "Unknown node-action: %s\n", val);
358 node_ctx.action = NODEACT_UNKNOWN;
359 }
360 break;
361 case sizeof("Node-copyfrom-path"):
362 if (constcmp(t, "Node-copyfrom-path"))
363 continue;
364 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
365 break;
366 case sizeof("Node-copyfrom-rev"):
367 if (constcmp(t, "Node-copyfrom-rev"))
368 continue;
369 node_ctx.srcRev = atoi(val);
370 break;
371 case sizeof("Text-content-length"):
372 if (!constcmp(t, "Text-content-length")) {
373 node_ctx.textLength = atoi(val);
374 break;
375 }
376 if (constcmp(t, "Prop-content-length"))
377 continue;
378 node_ctx.propLength = atoi(val);
379 break;
380 case sizeof("Text-delta"):
381 if (!constcmp(t, "Text-delta")) {
382 node_ctx.text_delta = !strcmp(val, "true");
383 break;
384 }
385 if (constcmp(t, "Prop-delta"))
386 continue;
387 node_ctx.prop_delta = !strcmp(val, "true");
388 break;
389 case sizeof("Content-length"):
390 if (constcmp(t, "Content-length"))
391 continue;
392 len = atoi(val);
393 t = buffer_read_line(&input);
394 if (!t)
395 die_short_read();
396 if (*t)
397 die("invalid dump: expected blank line after content length header");
398 if (active_ctx == REV_CTX) {
399 read_props();
400 } else if (active_ctx == NODE_CTX) {
401 handle_node();
402 active_ctx = REV_CTX;
403 } else {
404 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
405 if (buffer_skip_bytes(&input, len) != len)
406 die_short_read();
407 }
408 }
409 }
410 if (buffer_ferror(&input))
411 die_short_read();
412 if (active_ctx == NODE_CTX)
413 handle_node();
414 if (active_ctx != DUMP_CTX)
415 handle_revision();
416}
417int svndump_init(const char *filename)
419{
420 if (buffer_init(&input, filename))
421 return error("cannot open %s: %s", filename, strerror(errno));
422 repo_init();
423 strbuf_init(&dump_ctx.uuid, 4096);
424 strbuf_init(&dump_ctx.url, 4096);
425 strbuf_init(&rev_ctx.log, 4096);
426 strbuf_init(&rev_ctx.author, 4096);
427 reset_dump_ctx(NULL);
428 reset_rev_ctx(0);
429 reset_node_ctx(NULL);
430 return 0;
431}
432void svndump_deinit(void)
434{
435 repo_reset();
436 reset_dump_ctx(NULL);
437 reset_rev_ctx(0);
438 reset_node_ctx(NULL);
439 strbuf_release(&rev_ctx.log);
440 if (buffer_deinit(&input))
441 fprintf(stderr, "Input error\n");
442 if (ferror(stdout))
443 fprintf(stderr, "Output error\n");
444}
445void svndump_reset(void)
447{
448 buffer_reset(&input);
449 repo_reset();
450 strbuf_release(&dump_ctx.uuid);
451 strbuf_release(&dump_ctx.url);
452 strbuf_release(&rev_ctx.log);
453 strbuf_release(&rev_ctx.author);
454}