checkout: pass "struct checkout_opts *" as const pointer
[git/jnareb-git.git] / vcs-svn / fast_export.c
blob1f04697866bd481e24f17e0833c1c2d29c8e12e2
1 /*
2 * Licensed under a two-clause BSD-style license.
3 * See LICENSE for details.
4 */
6 #include "git-compat-util.h"
7 #include "strbuf.h"
8 #include "quote.h"
9 #include "fast_export.h"
10 #include "repo_tree.h"
11 #include "strbuf.h"
12 #include "svndiff.h"
13 #include "sliding_window.h"
14 #include "line_buffer.h"
16 #define MAX_GITSVN_LINE_LEN 4096
18 static uint32_t first_commit_done;
19 static struct line_buffer postimage = LINE_BUFFER_INIT;
20 static struct line_buffer report_buffer = LINE_BUFFER_INIT;
22 /* NEEDSWORK: move to fast_export_init() */
23 static int init_postimage(void)
25 static int postimage_initialized;
26 if (postimage_initialized)
27 return 0;
28 postimage_initialized = 1;
29 return buffer_tmpfile_init(&postimage);
32 void fast_export_init(int fd)
34 first_commit_done = 0;
35 if (buffer_fdinit(&report_buffer, fd))
36 die_errno("cannot read from file descriptor %d", fd);
39 void fast_export_deinit(void)
41 if (buffer_deinit(&report_buffer))
42 die_errno("error closing fast-import feedback stream");
45 void fast_export_delete(const char *path)
47 putchar('D');
48 putchar(' ');
49 quote_c_style(path, NULL, stdout, 0);
50 putchar('\n');
53 static void fast_export_truncate(const char *path, uint32_t mode)
55 fast_export_modify(path, mode, "inline");
56 printf("data 0\n\n");
59 void fast_export_modify(const char *path, uint32_t mode, const char *dataref)
61 /* Mode must be 100644, 100755, 120000, or 160000. */
62 if (!dataref) {
63 fast_export_truncate(path, mode);
64 return;
66 printf("M %06"PRIo32" %s ", mode, dataref);
67 quote_c_style(path, NULL, stdout, 0);
68 putchar('\n');
71 static char gitsvnline[MAX_GITSVN_LINE_LEN];
72 void fast_export_begin_commit(uint32_t revision, const char *author,
73 const struct strbuf *log,
74 const char *uuid, const char *url,
75 unsigned long timestamp)
77 static const struct strbuf empty = STRBUF_INIT;
78 if (!log)
79 log = ∅
80 if (*uuid && *url) {
81 snprintf(gitsvnline, MAX_GITSVN_LINE_LEN,
82 "\n\ngit-svn-id: %s@%"PRIu32" %s\n",
83 url, revision, uuid);
84 } else {
85 *gitsvnline = '\0';
87 printf("commit refs/heads/master\n");
88 printf("mark :%"PRIu32"\n", revision);
89 printf("committer %s <%s@%s> %ld +0000\n",
90 *author ? author : "nobody",
91 *author ? author : "nobody",
92 *uuid ? uuid : "local", timestamp);
93 printf("data %"PRIuMAX"\n",
94 (uintmax_t) (log->len + strlen(gitsvnline)));
95 fwrite(log->buf, log->len, 1, stdout);
96 printf("%s\n", gitsvnline);
97 if (!first_commit_done) {
98 if (revision > 1)
99 printf("from :%"PRIu32"\n", revision - 1);
100 first_commit_done = 1;
104 void fast_export_end_commit(uint32_t revision)
106 printf("progress Imported commit %"PRIu32".\n\n", revision);
109 static void ls_from_rev(uint32_t rev, const char *path)
111 /* ls :5 path/to/old/file */
112 printf("ls :%"PRIu32" ", rev);
113 quote_c_style(path, NULL, stdout, 0);
114 putchar('\n');
115 fflush(stdout);
118 static void ls_from_active_commit(const char *path)
120 /* ls "path/to/file" */
121 printf("ls \"");
122 quote_c_style(path, NULL, stdout, 1);
123 printf("\"\n");
124 fflush(stdout);
127 static const char *get_response_line(void)
129 const char *line = buffer_read_line(&report_buffer);
130 if (line)
131 return line;
132 if (buffer_ferror(&report_buffer))
133 die_errno("error reading from fast-import");
134 die("unexpected end of fast-import feedback");
137 static void die_short_read(struct line_buffer *input)
139 if (buffer_ferror(input))
140 die_errno("error reading dump file");
141 die("invalid dump: unexpected end of file");
144 static int ends_with(const char *s, size_t len, const char *suffix)
146 const size_t suffixlen = strlen(suffix);
147 if (len < suffixlen)
148 return 0;
149 return !memcmp(s + len - suffixlen, suffix, suffixlen);
152 static int parse_cat_response_line(const char *header, off_t *len)
154 size_t headerlen = strlen(header);
155 uintmax_t n;
156 const char *type;
157 const char *end;
159 if (ends_with(header, headerlen, " missing"))
160 return error("cat-blob reports missing blob: %s", header);
161 type = strstr(header, " blob ");
162 if (!type)
163 return error("cat-blob header has wrong object type: %s", header);
164 n = strtoumax(type + strlen(" blob "), (char **) &end, 10);
165 if (end == type + strlen(" blob "))
166 return error("cat-blob header does not contain length: %s", header);
167 if (memchr(type + strlen(" blob "), '-', end - type - strlen(" blob ")))
168 return error("cat-blob header contains negative length: %s", header);
169 if (n == UINTMAX_MAX || n > maximum_signed_value_of_type(off_t))
170 return error("blob too large for current definition of off_t");
171 *len = n;
172 if (*end)
173 return error("cat-blob header contains garbage after length: %s", header);
174 return 0;
177 static void check_preimage_overflow(off_t a, off_t b)
179 if (signed_add_overflows(a, b))
180 die("blob too large for current definition of off_t");
183 static long apply_delta(off_t len, struct line_buffer *input,
184 const char *old_data, uint32_t old_mode)
186 long ret;
187 struct sliding_view preimage = SLIDING_VIEW_INIT(&report_buffer, 0);
188 FILE *out;
190 if (init_postimage() || !(out = buffer_tmpfile_rewind(&postimage)))
191 die("cannot open temporary file for blob retrieval");
192 if (old_data) {
193 const char *response;
194 printf("cat-blob %s\n", old_data);
195 fflush(stdout);
196 response = get_response_line();
197 if (parse_cat_response_line(response, &preimage.max_off))
198 die("invalid cat-blob response: %s", response);
199 check_preimage_overflow(preimage.max_off, 1);
201 if (old_mode == REPO_MODE_LNK) {
202 strbuf_addstr(&preimage.buf, "link ");
203 check_preimage_overflow(preimage.max_off, strlen("link "));
204 preimage.max_off += strlen("link ");
205 check_preimage_overflow(preimage.max_off, 1);
207 if (svndiff0_apply(input, len, &preimage, out))
208 die("cannot apply delta");
209 if (old_data) {
210 /* Read the remainder of preimage and trailing newline. */
211 assert(!signed_add_overflows(preimage.max_off, 1));
212 preimage.max_off++; /* room for newline */
213 if (move_window(&preimage, preimage.max_off - 1, 1))
214 die("cannot seek to end of input");
215 if (preimage.buf.buf[0] != '\n')
216 die("missing newline after cat-blob response");
218 ret = buffer_tmpfile_prepare_to_read(&postimage);
219 if (ret < 0)
220 die("cannot read temporary file for blob retrieval");
221 strbuf_release(&preimage.buf);
222 return ret;
225 void fast_export_data(uint32_t mode, off_t len, struct line_buffer *input)
227 assert(len >= 0);
228 if (mode == REPO_MODE_LNK) {
229 /* svn symlink blobs start with "link " */
230 if (len < 5)
231 die("invalid dump: symlink too short for \"link\" prefix");
232 len -= 5;
233 if (buffer_skip_bytes(input, 5) != 5)
234 die_short_read(input);
236 printf("data %"PRIuMAX"\n", (uintmax_t) len);
237 if (buffer_copy_bytes(input, len) != len)
238 die_short_read(input);
239 fputc('\n', stdout);
242 static int parse_ls_response(const char *response, uint32_t *mode,
243 struct strbuf *dataref)
245 const char *tab;
246 const char *response_end;
248 assert(response);
249 response_end = response + strlen(response);
251 if (*response == 'm') { /* Missing. */
252 errno = ENOENT;
253 return -1;
256 /* Mode. */
257 if (response_end - response < (signed) strlen("100644") ||
258 response[strlen("100644")] != ' ')
259 die("invalid ls response: missing mode: %s", response);
260 *mode = 0;
261 for (; *response != ' '; response++) {
262 char ch = *response;
263 if (ch < '0' || ch > '7')
264 die("invalid ls response: mode is not octal: %s", response);
265 *mode *= 8;
266 *mode += ch - '0';
269 /* ' blob ' or ' tree ' */
270 if (response_end - response < (signed) strlen(" blob ") ||
271 (response[1] != 'b' && response[1] != 't'))
272 die("unexpected ls response: not a tree or blob: %s", response);
273 response += strlen(" blob ");
275 /* Dataref. */
276 tab = memchr(response, '\t', response_end - response);
277 if (!tab)
278 die("invalid ls response: missing tab: %s", response);
279 strbuf_add(dataref, response, tab - response);
280 return 0;
283 int fast_export_ls_rev(uint32_t rev, const char *path,
284 uint32_t *mode, struct strbuf *dataref)
286 ls_from_rev(rev, path);
287 return parse_ls_response(get_response_line(), mode, dataref);
290 int fast_export_ls(const char *path, uint32_t *mode, struct strbuf *dataref)
292 ls_from_active_commit(path);
293 return parse_ls_response(get_response_line(), mode, dataref);
296 void fast_export_blob_delta(uint32_t mode,
297 uint32_t old_mode, const char *old_data,
298 off_t len, struct line_buffer *input)
300 long postimage_len;
302 assert(len >= 0);
303 postimage_len = apply_delta(len, input, old_data, old_mode);
304 if (mode == REPO_MODE_LNK) {
305 buffer_skip_bytes(&postimage, strlen("link "));
306 postimage_len -= strlen("link ");
308 printf("data %ld\n", postimage_len);
309 buffer_copy_bytes(&postimage, postimage_len);
310 fputc('\n', stdout);