Code

vcs-svn: eliminate repo_tree structure
[git.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  */
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"
17 #define REPORT_FILENO 3
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
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 */
31 #define LENGTH_UNKNOWN (~0)
32 #define DATE_RFC2822_LEN 31
34 /* Create memory pool for log messages */
35 obj_pool_gen(log, char, 4096)
37 static struct line_buffer input = LINE_BUFFER_INIT;
39 #define REPORT_FILENO 3
41 static 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 }
50 static 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;
56 static struct {
57         uint32_t revision, author;
58         unsigned long timestamp;
59         char *log;
60 } rev_ctx;
62 static struct {
63         uint32_t version, uuid, url;
64 } dump_ctx;
66 static struct {
67         uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, uuid,
68                 revision_number, node_path, node_kind, node_action,
69                 node_copyfrom_path, node_copyfrom_rev, text_content_length,
70                 prop_content_length, content_length, svn_fs_dump_format_version,
71                 /* version 3 format */
72                 text_delta, prop_delta;
73 } keys;
75 static void reset_node_ctx(char *fname)
76 {
77         node_ctx.type = 0;
78         node_ctx.action = NODEACT_UNKNOWN;
79         node_ctx.propLength = LENGTH_UNKNOWN;
80         node_ctx.textLength = LENGTH_UNKNOWN;
81         node_ctx.src[0] = ~0;
82         node_ctx.srcRev = 0;
83         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
84         node_ctx.text_delta = 0;
85         node_ctx.prop_delta = 0;
86 }
88 static void reset_rev_ctx(uint32_t revision)
89 {
90         rev_ctx.revision = revision;
91         rev_ctx.timestamp = 0;
92         rev_ctx.log = NULL;
93         rev_ctx.author = ~0;
94 }
96 static void reset_dump_ctx(uint32_t url)
97 {
98         dump_ctx.url = url;
99         dump_ctx.version = 1;
100         dump_ctx.uuid = ~0;
103 static void init_keys(void)
105         keys.svn_log = pool_intern("svn:log");
106         keys.svn_author = pool_intern("svn:author");
107         keys.svn_date = pool_intern("svn:date");
108         keys.svn_executable = pool_intern("svn:executable");
109         keys.svn_special = pool_intern("svn:special");
110         keys.uuid = pool_intern("UUID");
111         keys.revision_number = pool_intern("Revision-number");
112         keys.node_path = pool_intern("Node-path");
113         keys.node_kind = pool_intern("Node-kind");
114         keys.node_action = pool_intern("Node-action");
115         keys.node_copyfrom_path = pool_intern("Node-copyfrom-path");
116         keys.node_copyfrom_rev = pool_intern("Node-copyfrom-rev");
117         keys.text_content_length = pool_intern("Text-content-length");
118         keys.prop_content_length = pool_intern("Prop-content-length");
119         keys.content_length = pool_intern("Content-length");
120         keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
121         /* version 3 format (Subversion 1.1.0) */
122         keys.text_delta = pool_intern("Text-delta");
123         keys.prop_delta = pool_intern("Prop-delta");
126 static void handle_property(uint32_t key, const char *val, uint32_t len,
127                                 uint32_t *type_set)
129         if (key == keys.svn_log) {
130                 if (!val)
131                         die("invalid dump: unsets svn:log");
132                 /* Value length excludes terminating nul. */
133                 rev_ctx.log = log_copy(len + 1, val);
134         } else if (key == keys.svn_author) {
135                 rev_ctx.author = pool_intern(val);
136         } else if (key == keys.svn_date) {
137                 if (!val)
138                         die("invalid dump: unsets svn:date");
139                 if (parse_date_basic(val, &rev_ctx.timestamp, NULL))
140                         warning("invalid timestamp: %s", val);
141         } else if (key == keys.svn_executable || key == keys.svn_special) {
142                 if (*type_set) {
143                         if (!val)
144                                 return;
145                         die("invalid dump: sets type twice");
146                 }
147                 if (!val) {
148                         node_ctx.type = REPO_MODE_BLB;
149                         return;
150                 }
151                 *type_set = 1;
152                 node_ctx.type = key == keys.svn_executable ?
153                                 REPO_MODE_EXE :
154                                 REPO_MODE_LNK;
155         }
158 static void read_props(void)
160         uint32_t key = ~0;
161         const char *t;
162         /*
163          * NEEDSWORK: to support simple mode changes like
164          *      K 11
165          *      svn:special
166          *      V 1
167          *      *
168          *      D 14
169          *      svn:executable
170          * we keep track of whether a mode has been set and reset to
171          * plain file only if not.  We should be keeping track of the
172          * symlink and executable bits separately instead.
173          */
174         uint32_t type_set = 0;
175         while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
176                 uint32_t len;
177                 const char *val;
178                 const char type = t[0];
180                 if (!type || t[1] != ' ')
181                         die("invalid property line: %s\n", t);
182                 len = atoi(&t[2]);
183                 val = buffer_read_string(&input, len);
184                 buffer_skip_bytes(&input, 1);   /* Discard trailing newline. */
186                 switch (type) {
187                 case 'K':
188                         key = pool_intern(val);
189                         continue;
190                 case 'D':
191                         key = pool_intern(val);
192                         val = NULL;
193                         len = 0;
194                         /* fall through */
195                 case 'V':
196                         handle_property(key, val, len, &type_set);
197                         key = ~0;
198                         continue;
199                 default:
200                         die("invalid property line: %s\n", t);
201                 }
202         }
205 static void handle_node(void)
207         const uint32_t type = node_ctx.type;
208         const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
209         const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
210         /*
211          * Old text for this node:
212          *  NULL        - directory or bug
213          *  empty_blob  - empty
214          *  "<dataref>" - data retrievable from fast-import
215          */
216         static const char *const empty_blob = "::empty::";
217         const char *old_data = NULL;
219         if (node_ctx.text_delta)
220                 die("text deltas not supported");
222         if (node_ctx.action == NODEACT_DELETE) {
223                 if (have_text || have_props || node_ctx.srcRev)
224                         die("invalid dump: deletion node has "
225                                 "copyfrom info, text, or properties");
226                 return repo_delete(node_ctx.dst);
227         }
228         if (node_ctx.action == NODEACT_REPLACE) {
229                 repo_delete(node_ctx.dst);
230                 node_ctx.action = NODEACT_ADD;
231         }
232         if (node_ctx.srcRev) {
233                 repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
234                 if (node_ctx.action == NODEACT_ADD)
235                         node_ctx.action = NODEACT_CHANGE;
236         }
237         if (have_text && type == REPO_MODE_DIR)
238                 die("invalid dump: directories cannot have text attached");
240         /*
241          * Find old content (old_data) and decide on the new mode.
242          */
243         if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
244                 if (type != REPO_MODE_DIR)
245                         die("invalid dump: root of tree is not a regular file");
246                 old_data = NULL;
247         } else if (node_ctx.action == NODEACT_CHANGE) {
248                 uint32_t mode;
249                 old_data = repo_read_path(node_ctx.dst);
250                 mode = repo_read_mode(node_ctx.dst);
251                 if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
252                         die("invalid dump: cannot modify a directory into a file");
253                 if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
254                         die("invalid dump: cannot modify a file into a directory");
255                 node_ctx.type = mode;
256         } else if (node_ctx.action == NODEACT_ADD) {
257                 if (type == REPO_MODE_DIR)
258                         old_data = NULL;
259                 else if (have_text)
260                         old_data = empty_blob;
261                 else
262                         die("invalid dump: adds node without text");
263         } else {
264                 die("invalid dump: Node-path block lacks Node-action");
265         }
267         /*
268          * Adjust mode to reflect properties.
269          */
270         if (have_props) {
271                 if (!node_ctx.prop_delta)
272                         node_ctx.type = type;
273                 if (node_ctx.propLength)
274                         read_props();
275         }
277         /*
278          * Save the result.
279          */
280         if (type == REPO_MODE_DIR)      /* directories are not tracked. */
281                 return;
282         assert(old_data);
283         if (old_data == empty_blob)
284                 /* For the fast_export_* functions, NULL means empty. */
285                 old_data = NULL;
286         if (!have_text) {
287                 fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
288                                         node_ctx.type, old_data);
289                 return;
290         }
291         fast_export_modify(REPO_MAX_PATH_DEPTH, node_ctx.dst,
292                                 node_ctx.type, "inline");
293         fast_export_data(node_ctx.type, node_ctx.textLength, &input);
296 static void begin_revision(void)
298         if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
299                 return;
300         fast_export_begin_commit(rev_ctx.revision, rev_ctx.author, rev_ctx.log,
301                 dump_ctx.uuid, dump_ctx.url, rev_ctx.timestamp);
304 static void end_revision(void)
306         if (rev_ctx.revision)
307                 fast_export_end_commit(rev_ctx.revision);
310 void svndump_read(const char *url)
312         char *val;
313         char *t;
314         uint32_t active_ctx = DUMP_CTX;
315         uint32_t len;
316         uint32_t key;
318         reset_dump_ctx(pool_intern(url));
319         while ((t = buffer_read_line(&input))) {
320                 val = strstr(t, ": ");
321                 if (!val)
322                         continue;
323                 *val++ = '\0';
324                 *val++ = '\0';
325                 key = pool_intern(t);
327                 if (key == keys.svn_fs_dump_format_version) {
328                         dump_ctx.version = atoi(val);
329                         if (dump_ctx.version > 3)
330                                 die("expected svn dump format version <= 3, found %"PRIu32,
331                                     dump_ctx.version);
332                 } else if (key == keys.uuid) {
333                         dump_ctx.uuid = pool_intern(val);
334                 } else if (key == keys.revision_number) {
335                         if (active_ctx == NODE_CTX)
336                                 handle_node();
337                         if (active_ctx == REV_CTX)
338                                 begin_revision();
339                         if (active_ctx != DUMP_CTX)
340                                 end_revision();
341                         active_ctx = REV_CTX;
342                         reset_rev_ctx(atoi(val));
343                 } else if (key == keys.node_path) {
344                         if (active_ctx == NODE_CTX)
345                                 handle_node();
346                         if (active_ctx == REV_CTX)
347                                 begin_revision();
348                         active_ctx = NODE_CTX;
349                         reset_node_ctx(val);
350                 } else if (key == keys.node_kind) {
351                         if (!strcmp(val, "dir"))
352                                 node_ctx.type = REPO_MODE_DIR;
353                         else if (!strcmp(val, "file"))
354                                 node_ctx.type = REPO_MODE_BLB;
355                         else
356                                 fprintf(stderr, "Unknown node-kind: %s\n", val);
357                 } else if (key == keys.node_action) {
358                         if (!strcmp(val, "delete")) {
359                                 node_ctx.action = NODEACT_DELETE;
360                         } else if (!strcmp(val, "add")) {
361                                 node_ctx.action = NODEACT_ADD;
362                         } else if (!strcmp(val, "change")) {
363                                 node_ctx.action = NODEACT_CHANGE;
364                         } else if (!strcmp(val, "replace")) {
365                                 node_ctx.action = NODEACT_REPLACE;
366                         } else {
367                                 fprintf(stderr, "Unknown node-action: %s\n", val);
368                                 node_ctx.action = NODEACT_UNKNOWN;
369                         }
370                 } else if (key == keys.node_copyfrom_path) {
371                         pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
372                 } else if (key == keys.node_copyfrom_rev) {
373                         node_ctx.srcRev = atoi(val);
374                 } else if (key == keys.text_content_length) {
375                         node_ctx.textLength = atoi(val);
376                 } else if (key == keys.prop_content_length) {
377                         node_ctx.propLength = atoi(val);
378                 } else if (key == keys.text_delta) {
379                         node_ctx.text_delta = !strcmp(val, "true");
380                 } else if (key == keys.prop_delta) {
381                         node_ctx.prop_delta = !strcmp(val, "true");
382                 } else if (key == keys.content_length) {
383                         len = atoi(val);
384                         buffer_read_line(&input);
385                         if (active_ctx == REV_CTX) {
386                                 read_props();
387                         } else if (active_ctx == NODE_CTX) {
388                                 handle_node();
389                                 active_ctx = INTERNODE_CTX;
390                         } else {
391                                 fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
392                                 buffer_skip_bytes(&input, len);
393                         }
394                 }
395         }
396         if (active_ctx == NODE_CTX)
397                 handle_node();
398         if (active_ctx == REV_CTX)
399                 begin_revision();
400         if (active_ctx != DUMP_CTX)
401                 end_revision();
404 int svndump_init(const char *filename)
406         if (buffer_init(&input, filename))
407                 return error("cannot open %s: %s", filename, strerror(errno));
408         fast_export_init(REPORT_FILENO);
409         reset_dump_ctx(~0);
410         reset_rev_ctx(0);
411         reset_node_ctx(NULL);
412         init_keys();
413         return 0;
416 void svndump_deinit(void)
418         log_reset();
419         fast_export_deinit();
420         reset_dump_ctx(~0);
421         reset_rev_ctx(0);
422         reset_node_ctx(NULL);
423         if (buffer_deinit(&input))
424                 fprintf(stderr, "Input error\n");
425         if (ferror(stdout))
426                 fprintf(stderr, "Output error\n");
429 void svndump_reset(void)
431         log_reset();
432         fast_export_reset();
433         buffer_reset(&input);
434         reset_dump_ctx(~0);
435         reset_rev_ctx(0);
436         reset_node_ctx(NULL);