Merge branch 'mr/vcs-svn-printf-ulong' into maint
[git/git.git] / vcs-svn / fast_export.c
1 /*
2 * Licensed under a two-clause BSD-style license.
3 * See LICENSE for details.
4 */
5
6 #include "cache.h"
7 #include "quote.h"
8 #include "fast_export.h"
9 #include "repo_tree.h"
10 #include "strbuf.h"
11 #include "svndiff.h"
12 #include "sliding_window.h"
13 #include "line_buffer.h"
14
15 #define MAX_GITSVN_LINE_LEN 4096
16
17 static uint32_t first_commit_done;
18 static struct line_buffer postimage = LINE_BUFFER_INIT;
19 static struct line_buffer report_buffer = LINE_BUFFER_INIT;
20
21 /* NEEDSWORK: move to fast_export_init() */
22 static int init_postimage(void)
23 {
24 static int postimage_initialized;
25 if (postimage_initialized)
26 return 0;
27 postimage_initialized = 1;
28 return buffer_tmpfile_init(&postimage);
29 }
30
31 void fast_export_init(int fd)
32 {
33 first_commit_done = 0;
34 if (buffer_fdinit(&report_buffer, fd))
35 die_errno("cannot read from file descriptor %d", fd);
36 }
37
38 void fast_export_deinit(void)
39 {
40 if (buffer_deinit(&report_buffer))
41 die_errno("error closing fast-import feedback stream");
42 }
43
44 void fast_export_delete(const char *path)
45 {
46 putchar('D');
47 putchar(' ');
48 quote_c_style(path, NULL, stdout, 0);
49 putchar('\n');
50 }
51
52 static void fast_export_truncate(const char *path, uint32_t mode)
53 {
54 fast_export_modify(path, mode, "inline");
55 printf("data 0\n\n");
56 }
57
58 void fast_export_modify(const char *path, uint32_t mode, const char *dataref)
59 {
60 /* Mode must be 100644, 100755, 120000, or 160000. */
61 if (!dataref) {
62 fast_export_truncate(path, mode);
63 return;
64 }
65 printf("M %06"PRIo32" %s ", mode, dataref);
66 quote_c_style(path, NULL, stdout, 0);
67 putchar('\n');
68 }
69
70 void fast_export_begin_note(uint32_t revision, const char *author,
71 const char *log, unsigned long timestamp, const char *note_ref)
72 {
73 static int firstnote = 1;
74 size_t loglen = strlen(log);
75 printf("commit %s\n", note_ref);
76 printf("committer %s <%s@%s> %lu +0000\n", author, author, "local", timestamp);
77 printf("data %"PRIuMAX"\n", (uintmax_t)loglen);
78 fwrite(log, loglen, 1, stdout);
79 if (firstnote) {
80 if (revision > 1)
81 printf("from %s^0", note_ref);
82 firstnote = 0;
83 }
84 fputc('\n', stdout);
85 }
86
87 void fast_export_note(const char *committish, const char *dataref)
88 {
89 printf("N %s %s\n", dataref, committish);
90 }
91
92 static char gitsvnline[MAX_GITSVN_LINE_LEN];
93 void fast_export_begin_commit(uint32_t revision, const char *author,
94 const struct strbuf *log,
95 const char *uuid, const char *url,
96 unsigned long timestamp, const char *local_ref)
97 {
98 static const struct strbuf empty = STRBUF_INIT;
99 if (!log)
100 log = &empty;
101 if (*uuid && *url) {
102 snprintf(gitsvnline, MAX_GITSVN_LINE_LEN,
103 "\n\ngit-svn-id: %s@%"PRIu32" %s\n",
104 url, revision, uuid);
105 } else {
106 *gitsvnline = '\0';
107 }
108 printf("commit %s\n", local_ref);
109 printf("mark :%"PRIu32"\n", revision);
110 printf("committer %s <%s@%s> %lu +0000\n",
111 *author ? author : "nobody",
112 *author ? author : "nobody",
113 *uuid ? uuid : "local", timestamp);
114 printf("data %"PRIuMAX"\n",
115 (uintmax_t) (log->len + strlen(gitsvnline)));
116 fwrite(log->buf, log->len, 1, stdout);
117 printf("%s\n", gitsvnline);
118 if (!first_commit_done) {
119 if (revision > 1)
120 printf("from :%"PRIu32"\n", revision - 1);
121 first_commit_done = 1;
122 }
123 }
124
125 void fast_export_end_commit(uint32_t revision)
126 {
127 printf("progress Imported commit %"PRIu32".\n\n", revision);
128 }
129
130 static void ls_from_rev(uint32_t rev, const char *path)
131 {
132 /* ls :5 path/to/old/file */
133 printf("ls :%"PRIu32" ", rev);
134 quote_c_style(path, NULL, stdout, 0);
135 putchar('\n');
136 fflush(stdout);
137 }
138
139 static void ls_from_active_commit(const char *path)
140 {
141 /* ls "path/to/file" */
142 printf("ls \"");
143 quote_c_style(path, NULL, stdout, 1);
144 printf("\"\n");
145 fflush(stdout);
146 }
147
148 static const char *get_response_line(void)
149 {
150 const char *line = buffer_read_line(&report_buffer);
151 if (line)
152 return line;
153 if (buffer_ferror(&report_buffer))
154 die_errno("error reading from fast-import");
155 die("unexpected end of fast-import feedback");
156 }
157
158 static void die_short_read(struct line_buffer *input)
159 {
160 if (buffer_ferror(input))
161 die_errno("error reading dump file");
162 die("invalid dump: unexpected end of file");
163 }
164
165 static int parse_cat_response_line(const char *header, off_t *len)
166 {
167 uintmax_t n;
168 const char *type;
169 const char *end;
170
171 if (ends_with(header, " missing"))
172 return error("cat-blob reports missing blob: %s", header);
173 type = strstr(header, " blob ");
174 if (!type)
175 return error("cat-blob header has wrong object type: %s", header);
176 n = strtoumax(type + strlen(" blob "), (char **) &end, 10);
177 if (end == type + strlen(" blob "))
178 return error("cat-blob header does not contain length: %s", header);
179 if (memchr(type + strlen(" blob "), '-', end - type - strlen(" blob ")))
180 return error("cat-blob header contains negative length: %s", header);
181 if (n == UINTMAX_MAX || n > maximum_signed_value_of_type(off_t))
182 return error("blob too large for current definition of off_t");
183 *len = n;
184 if (*end)
185 return error("cat-blob header contains garbage after length: %s", header);
186 return 0;
187 }
188
189 static void check_preimage_overflow(off_t a, off_t b)
190 {
191 if (signed_add_overflows(a, b))
192 die("blob too large for current definition of off_t");
193 }
194
195 static long apply_delta(off_t len, struct line_buffer *input,
196 const char *old_data, uint32_t old_mode)
197 {
198 long ret;
199 struct sliding_view preimage = SLIDING_VIEW_INIT(&report_buffer, 0);
200 FILE *out;
201
202 if (init_postimage() || !(out = buffer_tmpfile_rewind(&postimage)))
203 die("cannot open temporary file for blob retrieval");
204 if (old_data) {
205 const char *response;
206 printf("cat-blob %s\n", old_data);
207 fflush(stdout);
208 response = get_response_line();
209 if (parse_cat_response_line(response, &preimage.max_off))
210 die("invalid cat-blob response: %s", response);
211 check_preimage_overflow(preimage.max_off, 1);
212 }
213 if (old_mode == REPO_MODE_LNK) {
214 strbuf_addstr(&preimage.buf, "link ");
215 check_preimage_overflow(preimage.max_off, strlen("link "));
216 preimage.max_off += strlen("link ");
217 check_preimage_overflow(preimage.max_off, 1);
218 }
219 if (svndiff0_apply(input, len, &preimage, out))
220 die("cannot apply delta");
221 if (old_data) {
222 /* Read the remainder of preimage and trailing newline. */
223 assert(!signed_add_overflows(preimage.max_off, 1));
224 preimage.max_off++; /* room for newline */
225 if (move_window(&preimage, preimage.max_off - 1, 1))
226 die("cannot seek to end of input");
227 if (preimage.buf.buf[0] != '\n')
228 die("missing newline after cat-blob response");
229 }
230 ret = buffer_tmpfile_prepare_to_read(&postimage);
231 if (ret < 0)
232 die("cannot read temporary file for blob retrieval");
233 strbuf_release(&preimage.buf);
234 return ret;
235 }
236
237 void fast_export_buf_to_data(const struct strbuf *data)
238 {
239 printf("data %"PRIuMAX"\n", (uintmax_t)data->len);
240 fwrite(data->buf, data->len, 1, stdout);
241 fputc('\n', stdout);
242 }
243
244 void fast_export_data(uint32_t mode, off_t len, struct line_buffer *input)
245 {
246 assert(len >= 0);
247 if (mode == REPO_MODE_LNK) {
248 /* svn symlink blobs start with "link " */
249 if (len < 5)
250 die("invalid dump: symlink too short for \"link\" prefix");
251 len -= 5;
252 if (buffer_skip_bytes(input, 5) != 5)
253 die_short_read(input);
254 }
255 printf("data %"PRIuMAX"\n", (uintmax_t) len);
256 if (buffer_copy_bytes(input, len) != len)
257 die_short_read(input);
258 fputc('\n', stdout);
259 }
260
261 static int parse_ls_response(const char *response, uint32_t *mode,
262 struct strbuf *dataref)
263 {
264 const char *tab;
265 const char *response_end;
266
267 assert(response);
268 response_end = response + strlen(response);
269
270 if (*response == 'm') { /* Missing. */
271 errno = ENOENT;
272 return -1;
273 }
274
275 /* Mode. */
276 if (response_end - response < (signed) strlen("100644") ||
277 response[strlen("100644")] != ' ')
278 die("invalid ls response: missing mode: %s", response);
279 *mode = 0;
280 for (; *response != ' '; response++) {
281 char ch = *response;
282 if (ch < '0' || ch > '7')
283 die("invalid ls response: mode is not octal: %s", response);
284 *mode *= 8;
285 *mode += ch - '0';
286 }
287
288 /* ' blob ' or ' tree ' */
289 if (response_end - response < (signed) strlen(" blob ") ||
290 (response[1] != 'b' && response[1] != 't'))
291 die("unexpected ls response: not a tree or blob: %s", response);
292 response += strlen(" blob ");
293
294 /* Dataref. */
295 tab = memchr(response, '\t', response_end - response);
296 if (!tab)
297 die("invalid ls response: missing tab: %s", response);
298 strbuf_add(dataref, response, tab - response);
299 return 0;
300 }
301
302 int fast_export_ls_rev(uint32_t rev, const char *path,
303 uint32_t *mode, struct strbuf *dataref)
304 {
305 ls_from_rev(rev, path);
306 return parse_ls_response(get_response_line(), mode, dataref);
307 }
308
309 int fast_export_ls(const char *path, uint32_t *mode, struct strbuf *dataref)
310 {
311 ls_from_active_commit(path);
312 return parse_ls_response(get_response_line(), mode, dataref);
313 }
314
315 void fast_export_blob_delta(uint32_t mode,
316 uint32_t old_mode, const char *old_data,
317 off_t len, struct line_buffer *input)
318 {
319 long postimage_len;
320
321 assert(len >= 0);
322 postimage_len = apply_delta(len, input, old_data, old_mode);
323 if (mode == REPO_MODE_LNK) {
324 buffer_skip_bytes(&postimage, strlen("link "));
325 postimage_len -= strlen("link ");
326 }
327 printf("data %ld\n", postimage_len);
328 buffer_copy_bytes(&postimage, postimage_len);
329 fputc('\n', stdout);
330 }