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/*
18 * Compare start of string to literal of equal length;
19 * must be guarded by length test.
20 */
21#define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
22#define REPORT_FILENO 3
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 struct strbuf *val,
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_swap(&rev_ctx.log, val);
103 break;
104 case sizeof("svn:author"):
105 if (constcmp(key, "svn:author"))
106 break;
107 if (!val)
108 strbuf_reset(&rev_ctx.author);
109 else
110 strbuf_swap(&rev_ctx.author, val);
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->buf, &rev_ctx.timestamp, NULL))
118 warning("invalid timestamp: %s", val->buf);
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 static struct strbuf val = STRBUF_INIT;
155 const char *t;
156 /*
157 * NEEDSWORK: to support simple mode changes like
158 * K 11
159 * svn:special
160 * V 1
161 * *
162 * D 14
163 * svn:executable
164 * we keep track of whether a mode has been set and reset to
165 * plain file only if not. We should be keeping track of the
166 * symlink and executable bits separately instead.
167 */
168 uint32_t type_set = 0;
169 while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
170 uint32_t len;
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 strbuf_reset(&val);
178 buffer_read_binary(&input, &val, len);
179 if (val.len < len)
180 die_short_read();
181 /* Discard trailing newline. */
183 ch = buffer_read_char(&input);
184 if (ch == EOF)
185 die_short_read();
186 if (ch != '\n')
187 die("invalid dump: expected newline after %s", val.buf);
188 switch (type) {
190 case 'K':
191 strbuf_swap(&key, &val);
192 continue;
193 case 'D':
194 handle_property(&val, NULL, &type_set);
195 continue;
196 case 'V':
197 handle_property(&key, &val, &type_set);
198 strbuf_reset(&key);
199 continue;
200 default:
201 die("invalid property line: %s\n", t);
202 }
203 }
204}
205static void handle_node(void)
207{
208 const uint32_t type = node_ctx.type;
209 const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
210 const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
211 /*
212 * Old text for this node:
213 * NULL - directory or bug
214 * empty_blob - empty
215 * "<dataref>" - data retrievable from fast-import
216 */
217 static const char *const empty_blob = "::empty::";
218 const char *old_data = NULL;
219 if (node_ctx.text_delta)
221 die("text deltas not supported");
222 if (node_ctx.action == NODEACT_DELETE) {
224 if (have_text || have_props || node_ctx.srcRev)
225 die("invalid dump: deletion node has "
226 "copyfrom info, text, or properties");
227 repo_delete(node_ctx.dst);
228 return;
229 }
230 if (node_ctx.action == NODEACT_REPLACE) {
231 repo_delete(node_ctx.dst);
232 node_ctx.action = NODEACT_ADD;
233 }
234 if (node_ctx.srcRev) {
235 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
236 if (node_ctx.action == NODEACT_ADD)
237 node_ctx.action = NODEACT_CHANGE;
238 }
239 if (have_text && type == REPO_MODE_DIR)
240 die("invalid dump: directories cannot have text attached");
241 /*
243 * Find old content (old_data) and decide on the new mode.
244 */
245 if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
246 if (type != REPO_MODE_DIR)
247 die("invalid dump: root of tree is not a regular file");
248 old_data = NULL;
249 } else if (node_ctx.action == NODEACT_CHANGE) {
250 uint32_t mode;
251 old_data = repo_read_path(node_ctx.dst, &mode);
252 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
253 die("invalid dump: cannot modify a directory into a file");
254 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
255 die("invalid dump: cannot modify a file into a directory");
256 node_ctx.type = mode;
257 } else if (node_ctx.action == NODEACT_ADD) {
258 if (type == REPO_MODE_DIR)
259 old_data = NULL;
260 else if (have_text)
261 old_data = empty_blob;
262 else
263 die("invalid dump: adds node without text");
264 } else {
265 die("invalid dump: Node-path block lacks Node-action");
266 }
267 /*
269 * Adjust mode to reflect properties.
270 */
271 if (have_props) {
272 if (!node_ctx.prop_delta)
273 node_ctx.type = type;
274 if (node_ctx.propLength)
275 read_props();
276 }
277 /*
279 * Save the result.
280 */
281 if (type == REPO_MODE_DIR) /* directories are not tracked. */
282 return;
283 assert(old_data);
284 if (old_data == empty_blob)
285 /* For the fast_export_* functions, NULL means empty. */
286 old_data = NULL;
287 if (!have_text) {
288 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
289 node_ctx.type, old_data);
290 return;
291 }
292 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
293 node_ctx.type, "inline");
294 fast_export_data(node_ctx.type, node_ctx.textLength, &input);
295}
296static void begin_revision(void)
298{
299 if (!rev_ctx.revision) /* revision 0 gets no git commit. */
300 return;
301 fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
302 &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
303 rev_ctx.timestamp);
304}
305static void end_revision(void)
307{
308 if (rev_ctx.revision)
309 fast_export_end_commit(rev_ctx.revision);
310}
311void svndump_read(const char *url)
313{
314 char *val;
315 char *t;
316 uint32_t active_ctx = DUMP_CTX;
317 uint32_t len;
318 reset_dump_ctx(url);
320 while ((t = buffer_read_line(&input))) {
321 val = strchr(t, ':');
322 if (!val)
323 continue;
324 val++;
325 if (*val != ' ')
326 continue;
327 val++;
328 /* strlen(key) + 1 */
330 switch (val - t - 1) {
331 case sizeof("SVN-fs-dump-format-version"):
332 if (constcmp(t, "SVN-fs-dump-format-version"))
333 continue;
334 dump_ctx.version = atoi(val);
335 if (dump_ctx.version > 3)
336 die("expected svn dump format version <= 3, found %"PRIu32,
337 dump_ctx.version);
338 break;
339 case sizeof("UUID"):
340 if (constcmp(t, "UUID"))
341 continue;
342 strbuf_reset(&dump_ctx.uuid);
343 strbuf_addstr(&dump_ctx.uuid, val);
344 break;
345 case sizeof("Revision-number"):
346 if (constcmp(t, "Revision-number"))
347 continue;
348 if (active_ctx == NODE_CTX)
349 handle_node();
350 if (active_ctx == REV_CTX)
351 begin_revision();
352 if (active_ctx != DUMP_CTX)
353 end_revision();
354 active_ctx = REV_CTX;
355 reset_rev_ctx(atoi(val));
356 break;
357 case sizeof("Node-path"):
358 if (prefixcmp(t, "Node-"))
359 continue;
360 if (!constcmp(t + strlen("Node-"), "path")) {
361 if (active_ctx == NODE_CTX)
362 handle_node();
363 if (active_ctx == REV_CTX)
364 begin_revision();
365 active_ctx = NODE_CTX;
366 reset_node_ctx(val);
367 break;
368 }
369 if (constcmp(t + strlen("Node-"), "kind"))
370 continue;
371 if (!strcmp(val, "dir"))
372 node_ctx.type = REPO_MODE_DIR;
373 else if (!strcmp(val, "file"))
374 node_ctx.type = REPO_MODE_BLB;
375 else
376 fprintf(stderr, "Unknown node-kind: %s\n", val);
377 break;
378 case sizeof("Node-action"):
379 if (constcmp(t, "Node-action"))
380 continue;
381 if (!strcmp(val, "delete")) {
382 node_ctx.action = NODEACT_DELETE;
383 } else if (!strcmp(val, "add")) {
384 node_ctx.action = NODEACT_ADD;
385 } else if (!strcmp(val, "change")) {
386 node_ctx.action = NODEACT_CHANGE;
387 } else if (!strcmp(val, "replace")) {
388 node_ctx.action = NODEACT_REPLACE;
389 } else {
390 fprintf(stderr, "Unknown node-action: %s\n", val);
391 node_ctx.action = NODEACT_UNKNOWN;
392 }
393 break;
394 case sizeof("Node-copyfrom-path"):
395 if (constcmp(t, "Node-copyfrom-path"))
396 continue;
397 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
398 break;
399 case sizeof("Node-copyfrom-rev"):
400 if (constcmp(t, "Node-copyfrom-rev"))
401 continue;
402 node_ctx.srcRev = atoi(val);
403 break;
404 case sizeof("Text-content-length"):
405 if (!constcmp(t, "Text-content-length")) {
406 node_ctx.textLength = atoi(val);
407 break;
408 }
409 if (constcmp(t, "Prop-content-length"))
410 continue;
411 node_ctx.propLength = atoi(val);
412 break;
413 case sizeof("Text-delta"):
414 if (!constcmp(t, "Text-delta")) {
415 node_ctx.text_delta = !strcmp(val, "true");
416 break;
417 }
418 if (constcmp(t, "Prop-delta"))
419 continue;
420 node_ctx.prop_delta = !strcmp(val, "true");
421 break;
422 case sizeof("Content-length"):
423 if (constcmp(t, "Content-length"))
424 continue;
425 len = atoi(val);
426 t = buffer_read_line(&input);
427 if (!t)
428 die_short_read();
429 if (*t)
430 die("invalid dump: expected blank line after content length header");
431 if (active_ctx == REV_CTX) {
432 read_props();
433 } else if (active_ctx == NODE_CTX) {
434 handle_node();
435 active_ctx = INTERNODE_CTX;
436 } else {
437 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
438 if (buffer_skip_bytes(&input, len) != len)
439 die_short_read();
440 }
441 }
442 }
443 if (buffer_ferror(&input))
444 die_short_read();
445 if (active_ctx == NODE_CTX)
446 handle_node();
447 if (active_ctx == REV_CTX)
448 begin_revision();
449 if (active_ctx != DUMP_CTX)
450 end_revision();
451}
452int svndump_init(const char *filename)
454{
455 if (buffer_init(&input, filename))
456 return error("cannot open %s: %s", filename, strerror(errno));
457 fast_export_init(REPORT_FILENO);
458 strbuf_init(&dump_ctx.uuid, 4096);
459 strbuf_init(&dump_ctx.url, 4096);
460 strbuf_init(&rev_ctx.log, 4096);
461 strbuf_init(&rev_ctx.author, 4096);
462 reset_dump_ctx(NULL);
463 reset_rev_ctx(0);
464 reset_node_ctx(NULL);
465 return 0;
466}
467void svndump_deinit(void)
469{
470 fast_export_deinit();
471 reset_dump_ctx(NULL);
472 reset_rev_ctx(0);
473 reset_node_ctx(NULL);
474 strbuf_release(&rev_ctx.log);
475 if (buffer_deinit(&input))
476 fprintf(stderr, "Input error\n");
477 if (ferror(stdout))
478 fprintf(stderr, "Output error\n");
479}
480void svndump_reset(void)
482{
483 fast_export_reset();
484 buffer_reset(&input);
485 strbuf_release(&dump_ctx.uuid);
486 strbuf_release(&dump_ctx.url);
487 strbuf_release(&rev_ctx.log);
488 strbuf_release(&rev_ctx.author);
489}