77680a31e8fed797715bc7c6727082574951ad0c
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/*
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 NODEACT_REPLACE 4
24#define NODEACT_DELETE 3
25#define NODEACT_ADD 2
26#define NODEACT_CHANGE 1
27#define NODEACT_UNKNOWN 0
28#define DUMP_CTX 0
30#define REV_CTX 1
31#define NODE_CTX 2
32#define LENGTH_UNKNOWN (~0)
34#define DATE_RFC2822_LEN 31
35/* Create memory pool for log messages */
37obj_pool_gen(log, char, 4096)
38static struct line_buffer input = LINE_BUFFER_INIT;
40static char *log_copy(uint32_t length, const char *log)
42{
43 char *buffer;
44 log_free(log_pool.size);
45 buffer = log_pointer(log_alloc(length));
46 strncpy(buffer, log, length);
47 return buffer;
48}
49static struct {
51 uint32_t action, propLength, textLength, srcRev, type;
52 uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
53 uint32_t text_delta, prop_delta;
54} node_ctx;
55static struct {
57 uint32_t revision, author;
58 unsigned long timestamp;
59 char *log;
60} rev_ctx;
61static struct {
63 uint32_t version, uuid, url;
64} dump_ctx;
65static void reset_node_ctx(char *fname)
67{
68 node_ctx.type = 0;
69 node_ctx.action = NODEACT_UNKNOWN;
70 node_ctx.propLength = LENGTH_UNKNOWN;
71 node_ctx.textLength = LENGTH_UNKNOWN;
72 node_ctx.src[0] = ~0;
73 node_ctx.srcRev = 0;
74 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
75 node_ctx.text_delta = 0;
76 node_ctx.prop_delta = 0;
77}
78static void reset_rev_ctx(uint32_t revision)
80{
81 rev_ctx.revision = revision;
82 rev_ctx.timestamp = 0;
83 rev_ctx.log = NULL;
84 rev_ctx.author = ~0;
85}
86static void reset_dump_ctx(uint32_t url)
88{
89 dump_ctx.url = url;
90 dump_ctx.version = 1;
91 dump_ctx.uuid = ~0;
92}
93static void handle_property(const struct strbuf *key_buf,
95 const char *val, uint32_t len,
96 uint32_t *type_set)
97{
98 const char *key = key_buf->buf;
99 size_t keylen = key_buf->len;
100 switch (keylen + 1) {
102 case sizeof("svn:log"):
103 if (constcmp(key, "svn:log"))
104 break;
105 if (!val)
106 die("invalid dump: unsets svn:log");
107 /* Value length excludes terminating nul. */
108 rev_ctx.log = log_copy(len + 1, val);
109 break;
110 case sizeof("svn:author"):
111 if (constcmp(key, "svn:author"))
112 break;
113 rev_ctx.author = pool_intern(val);
114 break;
115 case sizeof("svn:date"):
116 if (constcmp(key, "svn:date"))
117 break;
118 if (!val)
119 die("invalid dump: unsets svn:date");
120 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
121 warning("invalid timestamp: %s", val);
122 break;
123 case sizeof("svn:executable"):
124 case sizeof("svn:special"):
125 if (keylen == strlen("svn:executable") &&
126 constcmp(key, "svn:executable"))
127 break;
128 if (keylen == strlen("svn:special") &&
129 constcmp(key, "svn:special"))
130 break;
131 if (*type_set) {
132 if (!val)
133 return;
134 die("invalid dump: sets type twice");
135 }
136 if (!val) {
137 node_ctx.type = REPO_MODE_BLB;
138 return;
139 }
140 *type_set = 1;
141 node_ctx.type = keylen == strlen("svn:executable") ?
142 REPO_MODE_EXE :
143 REPO_MODE_LNK;
144 }
145}
146static void die_short_read(void)
148{
149 if (buffer_ferror(&input))
150 die_errno("error reading dump file");
151 die("invalid dump: unexpected end of file");
152}
153static void read_props(void)
155{
156 static struct strbuf key = STRBUF_INIT;
157 const char *t;
158 /*
159 * NEEDSWORK: to support simple mode changes like
160 * K 11
161 * svn:special
162 * V 1
163 * *
164 * D 14
165 * svn:executable
166 * we keep track of whether a mode has been set and reset to
167 * plain file only if not. We should be keeping track of the
168 * symlink and executable bits separately instead.
169 */
170 uint32_t type_set = 0;
171 while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
172 uint32_t len;
173 const char *val;
174 const char type = t[0];
175 int ch;
176 if (!type || t[1] != ' ')
178 die("invalid property line: %s\n", t);
179 len = atoi(&t[2]);
180 val = buffer_read_string(&input, len);
181 if (!val || strlen(val) != len)
182 die_short_read();
183 /* Discard trailing newline. */
185 ch = buffer_read_char(&input);
186 if (ch == EOF)
187 die_short_read();
188 if (ch != '\n')
189 die("invalid dump: expected newline after %s", val);
190 switch (type) {
192 case 'K':
193 case 'D':
194 strbuf_reset(&key);
195 if (val)
196 strbuf_add(&key, val, len);
197 if (type == 'K')
198 continue;
199 assert(type == 'D');
200 val = NULL;
201 len = 0;
202 /* fall through */
203 case 'V':
204 handle_property(&key, val, len, &type_set);
205 strbuf_reset(&key);
206 continue;
207 default:
208 die("invalid property line: %s\n", t);
209 }
210 }
211}
212static void handle_node(void)
214{
215 uint32_t mark = 0;
216 const uint32_t type = node_ctx.type;
217 const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
218 const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
219 if (node_ctx.text_delta)
221 die("text deltas not supported");
222 if (have_text)
223 mark = next_blob_mark();
224 if (node_ctx.action == NODEACT_DELETE) {
225 if (have_text || have_props || node_ctx.srcRev)
226 die("invalid dump: deletion node has "
227 "copyfrom info, text, or properties");
228 return repo_delete(node_ctx.dst);
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 * Decide on the new content (mark) and mode (node_ctx.type).
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 } else if (node_ctx.action == NODEACT_CHANGE) {
249 uint32_t mode;
250 if (!have_text)
251 mark = repo_read_path(node_ctx.dst);
252 mode = repo_read_mode(node_ctx.dst);
253 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
254 die("invalid dump: cannot modify a directory into a file");
255 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
256 die("invalid dump: cannot modify a file into a directory");
257 node_ctx.type = mode;
258 } else if (node_ctx.action == NODEACT_ADD) {
259 if (!have_text && type != REPO_MODE_DIR)
260 die("invalid dump: adds node without text");
261 } else {
262 die("invalid dump: Node-path block lacks Node-action");
263 }
264 /*
266 * Adjust mode to reflect properties.
267 */
268 if (have_props) {
269 if (!node_ctx.prop_delta)
270 node_ctx.type = type;
271 if (node_ctx.propLength)
272 read_props();
273 }
274 /*
276 * Save the result.
277 */
278 repo_add(node_ctx.dst, node_ctx.type, mark);
279 if (have_text)
280 fast_export_blob(node_ctx.type, mark,
281 node_ctx.textLength, &input);
282}
283static void handle_revision(void)
285{
286 if (rev_ctx.revision)
287 repo_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
288 dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
289}
290void svndump_read(const char *url)
292{
293 char *val;
294 char *t;
295 uint32_t active_ctx = DUMP_CTX;
296 uint32_t len;
297 reset_dump_ctx(pool_intern(url));
299 while ((t = buffer_read_line(&input))) {
300 val = strstr(t, ": ");
301 if (!val)
302 continue;
303 val += 2;
304 /* strlen(key) + 1 */
306 switch (val - t - 1) {
307 case sizeof("SVN-fs-dump-format-version"):
308 if (constcmp(t, "SVN-fs-dump-format-version"))
309 continue;
310 dump_ctx.version = atoi(val);
311 if (dump_ctx.version > 3)
312 die("expected svn dump format version <= 3, found %"PRIu32,
313 dump_ctx.version);
314 break;
315 case sizeof("UUID"):
316 if (constcmp(t, "UUID"))
317 continue;
318 dump_ctx.uuid = pool_intern(val);
319 break;
320 case sizeof("Revision-number"):
321 if (constcmp(t, "Revision-number"))
322 continue;
323 if (active_ctx == NODE_CTX)
324 handle_node();
325 if (active_ctx != DUMP_CTX)
326 handle_revision();
327 active_ctx = REV_CTX;
328 reset_rev_ctx(atoi(val));
329 break;
330 case sizeof("Node-path"):
331 if (prefixcmp(t, "Node-"))
332 continue;
333 if (!constcmp(t + strlen("Node-"), "path")) {
334 if (active_ctx == NODE_CTX)
335 handle_node();
336 active_ctx = NODE_CTX;
337 reset_node_ctx(val);
338 break;
339 }
340 if (constcmp(t + strlen("Node-"), "kind"))
341 continue;
342 if (!strcmp(val, "dir"))
343 node_ctx.type = REPO_MODE_DIR;
344 else if (!strcmp(val, "file"))
345 node_ctx.type = REPO_MODE_BLB;
346 else
347 fprintf(stderr, "Unknown node-kind: %s\n", val);
348 break;
349 case sizeof("Node-action"):
350 if (constcmp(t, "Node-action"))
351 continue;
352 if (!strcmp(val, "delete")) {
353 node_ctx.action = NODEACT_DELETE;
354 } else if (!strcmp(val, "add")) {
355 node_ctx.action = NODEACT_ADD;
356 } else if (!strcmp(val, "change")) {
357 node_ctx.action = NODEACT_CHANGE;
358 } else if (!strcmp(val, "replace")) {
359 node_ctx.action = NODEACT_REPLACE;
360 } else {
361 fprintf(stderr, "Unknown node-action: %s\n", val);
362 node_ctx.action = NODEACT_UNKNOWN;
363 }
364 break;
365 case sizeof("Node-copyfrom-path"):
366 if (constcmp(t, "Node-copyfrom-path"))
367 continue;
368 pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
369 break;
370 case sizeof("Node-copyfrom-rev"):
371 if (constcmp(t, "Node-copyfrom-rev"))
372 continue;
373 node_ctx.srcRev = atoi(val);
374 break;
375 case sizeof("Text-content-length"):
376 if (!constcmp(t, "Text-content-length")) {
377 node_ctx.textLength = atoi(val);
378 break;
379 }
380 if (constcmp(t, "Prop-content-length"))
381 continue;
382 node_ctx.propLength = atoi(val);
383 break;
384 case sizeof("Text-delta"):
385 if (!constcmp(t, "Text-delta")) {
386 node_ctx.text_delta = !strcmp(val, "true");
387 break;
388 }
389 if (constcmp(t, "Prop-delta"))
390 continue;
391 node_ctx.prop_delta = !strcmp(val, "true");
392 break;
393 case sizeof("Content-length"):
394 if (constcmp(t, "Content-length"))
395 continue;
396 len = atoi(val);
397 t = buffer_read_line(&input);
398 if (!t)
399 die_short_read();
400 if (*t)
401 die("invalid dump: expected blank line after content length header");
402 if (active_ctx == REV_CTX) {
403 read_props();
404 } else if (active_ctx == NODE_CTX) {
405 handle_node();
406 active_ctx = REV_CTX;
407 } else {
408 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
409 if (buffer_skip_bytes(&input, len) != len)
410 die_short_read();
411 }
412 }
413 }
414 if (buffer_ferror(&input))
415 die_short_read();
416 if (active_ctx == NODE_CTX)
417 handle_node();
418 if (active_ctx != DUMP_CTX)
419 handle_revision();
420}
421int svndump_init(const char *filename)
423{
424 if (buffer_init(&input, filename))
425 return error("cannot open %s: %s", filename, strerror(errno));
426 repo_init();
427 reset_dump_ctx(~0);
428 reset_rev_ctx(0);
429 reset_node_ctx(NULL);
430 return 0;
431}
432void svndump_deinit(void)
434{
435 log_reset();
436 repo_reset();
437 reset_dump_ctx(~0);
438 reset_rev_ctx(0);
439 reset_node_ctx(NULL);
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 log_reset();
449 buffer_reset(&input);
450 repo_reset();
451 reset_dump_ctx(~0);
452 reset_rev_ctx(0);
453 reset_node_ctx(NULL);
454}