vcs-svn: add a comment before each commit
[git] / vcs-svn / svndump.c
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
10 #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
17 #define REPORT_FILENO 3
18
19 #define NODEACT_REPLACE 4
20 #define NODEACT_DELETE 3
21 #define NODEACT_ADD 2
22 #define NODEACT_CHANGE 1
23 #define NODEACT_UNKNOWN 0
24
25 /* States: */
26 #define DUMP_CTX 0      /* dump metadata */
27 #define REV_CTX  1      /* revision metadata */
28 #define NODE_CTX 2      /* node metadata */
29 #define INTERNODE_CTX 3 /* between nodes */
30
31 #define LENGTH_UNKNOWN (~0)
32 #define DATE_RFC2822_LEN 31
33
34 /* Create memory pool for log messages */
35 obj_pool_gen(log, char, 4096)
36
37 static struct line_buffer input = LINE_BUFFER_INIT;
38
39 static char *log_copy(uint32_t length, const char *log)
40 {
41         char *buffer;
42         log_free(log_pool.size);
43         buffer = log_pointer(log_alloc(length));
44         strncpy(buffer, log, length);
45         return buffer;
46 }
47
48 static struct {
49         uint32_t action, propLength, textLength, srcRev, type;
50         uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
51         uint32_t text_delta, prop_delta;
52 } node_ctx;
53
54 static struct {
55         uint32_t revision, author;
56         unsigned long timestamp;
57         char *log;
58 } rev_ctx;
59
60 static struct {
61         uint32_t version, uuid, url;
62 } dump_ctx;
63
64 static struct {
65         uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, uuid,
66                 revision_number, node_path, node_kind, node_action,
67                 node_copyfrom_path, node_copyfrom_rev, text_content_length,
68                 prop_content_length, content_length, svn_fs_dump_format_version,
69                 /* version 3 format */
70                 text_delta, prop_delta;
71 } keys;
72
73 static void reset_node_ctx(char *fname)
74 {
75         node_ctx.type = 0;
76         node_ctx.action = NODEACT_UNKNOWN;
77         node_ctx.propLength = LENGTH_UNKNOWN;
78         node_ctx.textLength = LENGTH_UNKNOWN;
79         node_ctx.src[0] = ~0;
80         node_ctx.srcRev = 0;
81         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
82         node_ctx.text_delta = 0;
83         node_ctx.prop_delta = 0;
84 }
85
86 static void reset_rev_ctx(uint32_t revision)
87 {
88         rev_ctx.revision = revision;
89         rev_ctx.timestamp = 0;
90         rev_ctx.log = NULL;
91         rev_ctx.author = ~0;
92 }
93
94 static void reset_dump_ctx(uint32_t url)
95 {
96         dump_ctx.url = url;
97         dump_ctx.version = 1;
98         dump_ctx.uuid = ~0;
99 }
100
101 static void init_keys(void)
102 {
103         keys.svn_log = pool_intern("svn:log");
104         keys.svn_author = pool_intern("svn:author");
105         keys.svn_date = pool_intern("svn:date");
106         keys.svn_executable = pool_intern("svn:executable");
107         keys.svn_special = pool_intern("svn:special");
108         keys.uuid = pool_intern("UUID");
109         keys.revision_number = pool_intern("Revision-number");
110         keys.node_path = pool_intern("Node-path");
111         keys.node_kind = pool_intern("Node-kind");
112         keys.node_action = pool_intern("Node-action");
113         keys.node_copyfrom_path = pool_intern("Node-copyfrom-path");
114         keys.node_copyfrom_rev = pool_intern("Node-copyfrom-rev");
115         keys.text_content_length = pool_intern("Text-content-length");
116         keys.prop_content_length = pool_intern("Prop-content-length");
117         keys.content_length = pool_intern("Content-length");
118         keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
119         /* version 3 format (Subversion 1.1.0) */
120         keys.text_delta = pool_intern("Text-delta");
121         keys.prop_delta = pool_intern("Prop-delta");
122 }
123
124 static void handle_property(uint32_t key, const char *val, uint32_t len,
125                                 uint32_t *type_set)
126 {
127         if (key == keys.svn_log) {
128                 if (!val)
129                         die("invalid dump: unsets svn:log");
130                 /* Value length excludes terminating nul. */
131                 rev_ctx.log = log_copy(len + 1, val);
132         } else if (key == keys.svn_author) {
133                 rev_ctx.author = pool_intern(val);
134         } else if (key == keys.svn_date) {
135                 if (!val)
136                         die("invalid dump: unsets svn:date");
137                 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
138                         warning("invalid timestamp: %s", val);
139         } else if (key == keys.svn_executable || key == keys.svn_special) {
140                 if (*type_set) {
141                         if (!val)
142                                 return;
143                         die("invalid dump: sets type twice");
144                 }
145                 if (!val) {
146                         node_ctx.type = REPO_MODE_BLB;
147                         return;
148                 }
149                 *type_set = 1;
150                 node_ctx.type = key == keys.svn_executable ?
151                                 REPO_MODE_EXE :
152                                 REPO_MODE_LNK;
153         }
154 }
155
156 static void read_props(void)
157 {
158         uint32_t key = ~0;
159         const char *t;
160         /*
161          * NEEDSWORK: to support simple mode changes like
162          *      K 11
163          *      svn:special
164          *      V 1
165          *      *
166          *      D 14
167          *      svn:executable
168          * we keep track of whether a mode has been set and reset to
169          * plain file only if not.  We should be keeping track of the
170          * symlink and executable bits separately instead.
171          */
172         uint32_t type_set = 0;
173         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
174                 uint32_t len;
175                 const char *val;
176                 const char type = t[0];
177
178                 if (!type || t[1] != ' ')
179                         die("invalid property line: %s\n", t);
180                 len = atoi(&t[2]);
181                 val = buffer_read_string(&input, len);
182                 buffer_skip_bytes(&input, 1);   /* Discard trailing newline. */
183
184                 switch (type) {
185                 case 'K':
186                         key = pool_intern(val);
187                         continue;
188                 case 'D':
189                         key = pool_intern(val);
190                         val = NULL;
191                         len = 0;
192                         /* fall through */
193                 case 'V':
194                         handle_property(key, val, len, &type_set);
195                         key = ~0;
196                         continue;
197                 default:
198                         die("invalid property line: %s\n", t);
199                 }
200         }
201 }
202
203 static 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
210         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                 return repo_delete(node_ctx.dst);
219         }
220         if (node_ctx.action == NODEACT_REPLACE) {
221                 repo_delete(node_ctx.dst);
222                 node_ctx.action = NODEACT_ADD;
223         }
224         if (node_ctx.srcRev) {
225                 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
226                 if (node_ctx.action == NODEACT_ADD)
227                         node_ctx.action = NODEACT_CHANGE;
228         }
229         if (have_text && type == REPO_MODE_DIR)
230                 die("invalid dump: directories cannot have text attached");
231
232         /*
233          * Decide on the new content (mark) and mode (node_ctx.type).
234          */
235         if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
236                 if (type != REPO_MODE_DIR)
237                         die("invalid dump: root of tree is not a regular file");
238         } else if (node_ctx.action == NODEACT_CHANGE) {
239                 uint32_t mode;
240                 if (!have_text)
241                         mark = repo_read_path(node_ctx.dst);
242                 mode = repo_read_mode(node_ctx.dst);
243                 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
244                         die("invalid dump: cannot modify a directory into a file");
245                 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
246                         die("invalid dump: cannot modify a file into a directory");
247                 node_ctx.type = mode;
248         } else if (node_ctx.action == NODEACT_ADD) {
249                 if (!have_text && type != REPO_MODE_DIR)
250                         die("invalid dump: adds node without text");
251         } else {
252                 die("invalid dump: Node-path block lacks Node-action");
253         }
254
255         /*
256          * Adjust mode to reflect properties.
257          */
258         if (have_props) {
259                 if (!node_ctx.prop_delta)
260                         node_ctx.type = type;
261                 if (node_ctx.propLength)
262                         read_props();
263         }
264
265         /*
266          * Save the result.
267          */
268         repo_add(node_ctx.dst, node_ctx.type, mark);
269         if (have_text)
270                 fast_export_blob(node_ctx.type, mark,
271                                  node_ctx.textLength, &input);
272 }
273
274 static void begin_revision(void)
275 {
276         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
277                 return;
278         fast_export_begin_commit(rev_ctx.revision);
279 }
280
281 static void end_revision(void)
282 {
283         if (rev_ctx.revision)
284                 repo_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
285                         dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
286 }
287
288 void svndump_read(const char *url)
289 {
290         char *val;
291         char *t;
292         uint32_t active_ctx = DUMP_CTX;
293         uint32_t len;
294         uint32_t key;
295
296         reset_dump_ctx(pool_intern(url));
297         while ((t = buffer_read_line(&input))) {
298                 val = strstr(t, ": ");
299                 if (!val)
300                         continue;
301                 *val++ = '\0';
302                 *val++ = '\0';
303                 key = pool_intern(t);
304
305                 if (key == keys.svn_fs_dump_format_version) {
306                         dump_ctx.version = atoi(val);
307                         if (dump_ctx.version > 3)
308                                 die("expected svn dump format version <= 3, found %"PRIu32,
309                                     dump_ctx.version);
310                 } else if (key == keys.uuid) {
311                         dump_ctx.uuid = pool_intern(val);
312                 } else if (key == keys.revision_number) {
313                         if (active_ctx == NODE_CTX)
314                                 handle_node();
315                         if (active_ctx == REV_CTX)
316                                 begin_revision();
317                         if (active_ctx != DUMP_CTX)
318                                 end_revision();
319                         active_ctx = REV_CTX;
320                         reset_rev_ctx(atoi(val));
321                 } else if (key == keys.node_path) {
322                         if (active_ctx == NODE_CTX)
323                                 handle_node();
324                         if (active_ctx == REV_CTX)
325                                 begin_revision();
326                         active_ctx = NODE_CTX;
327                         reset_node_ctx(val);
328                 } else if (key == keys.node_kind) {
329                         if (!strcmp(val, "dir"))
330                                 node_ctx.type = REPO_MODE_DIR;
331                         else if (!strcmp(val, "file"))
332                                 node_ctx.type = REPO_MODE_BLB;
333                         else
334                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
335                 } else if (key == keys.node_action) {
336                         if (!strcmp(val, "delete")) {
337                                 node_ctx.action = NODEACT_DELETE;
338                         } else if (!strcmp(val, "add")) {
339                                 node_ctx.action = NODEACT_ADD;
340                         } else if (!strcmp(val, "change")) {
341                                 node_ctx.action = NODEACT_CHANGE;
342                         } else if (!strcmp(val, "replace")) {
343                                 node_ctx.action = NODEACT_REPLACE;
344                         } else {
345                                 fprintf(stderr, "Unknown node-action: %s\n", val);
346                                 node_ctx.action = NODEACT_UNKNOWN;
347                         }
348                 } else if (key == keys.node_copyfrom_path) {
349                         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
350                 } else if (key == keys.node_copyfrom_rev) {
351                         node_ctx.srcRev = atoi(val);
352                 } else if (key == keys.text_content_length) {
353                         node_ctx.textLength = atoi(val);
354                 } else if (key == keys.prop_content_length) {
355                         node_ctx.propLength = atoi(val);
356                 } else if (key == keys.text_delta) {
357                         node_ctx.text_delta = !strcmp(val, "true");
358                 } else if (key == keys.prop_delta) {
359                         node_ctx.prop_delta = !strcmp(val, "true");
360                 } else if (key == keys.content_length) {
361                         len = atoi(val);
362                         buffer_read_line(&input);
363                         if (active_ctx == REV_CTX) {
364                                 read_props();
365                         } else if (active_ctx == NODE_CTX) {
366                                 handle_node();
367                                 active_ctx = INTERNODE_CTX;
368                         } else {
369                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
370                                 buffer_skip_bytes(&input, len);
371                         }
372                 }
373         }
374         if (active_ctx == NODE_CTX)
375                 handle_node();
376         if (active_ctx == REV_CTX)
377                 begin_revision();
378         if (active_ctx != DUMP_CTX)
379                 end_revision();
380 }
381
382 int svndump_init(const char *filename)
383 {
384         if (buffer_init(&input, filename))
385                 return error("cannot open %s: %s", filename, strerror(errno));
386         repo_init();
387         fast_export_init(REPORT_FILENO);
388         reset_dump_ctx(~0);
389         reset_rev_ctx(0);
390         reset_node_ctx(NULL);
391         init_keys();
392         return 0;
393 }
394
395 void svndump_deinit(void)
396 {
397         log_reset();
398         fast_export_deinit();
399         repo_reset();
400         reset_dump_ctx(~0);
401         reset_rev_ctx(0);
402         reset_node_ctx(NULL);
403         if (buffer_deinit(&input))
404                 fprintf(stderr, "Input error\n");
405         if (ferror(stdout))
406                 fprintf(stderr, "Output error\n");
407 }
408
409 void svndump_reset(void)
410 {
411         log_reset();
412         fast_export_reset();
413         buffer_reset(&input);
414         repo_reset();
415         reset_dump_ctx(~0);
416         reset_rev_ctx(0);
417         reset_node_ctx(NULL);
418 }