Git 2.8.4
[git/git.git] / remote-testsvn.c
CommitLineData
68f64ff8 1#include "cache.h"
fb58c8d5 2#include "refs.h"
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3#include "remote.h"
4#include "strbuf.h"
5#include "url.h"
6#include "exec_cmd.h"
7#include "run-command.h"
8#include "vcs-svn/svndump.h"
9#include "notes.h"
10#include "argv-array.h"
11
12static const char *url;
f6529de9 13static int dump_from_file;
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14static const char *private_ref;
15static const char *remote_ref = "refs/heads/master";
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16static const char *marksfilename, *notes_ref;
17struct rev_note { unsigned int rev_nr; };
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18
19static int cmd_capabilities(const char *line);
20static int cmd_import(const char *line);
21static int cmd_list(const char *line);
22
23typedef int (*input_command_handler)(const char *);
24struct input_command_entry {
25 const char *name;
26 input_command_handler fn;
27 unsigned char batchable; /* whether the command starts or is part of a batch */
28};
29
30static const struct input_command_entry input_command_list[] = {
31 { "capabilities", cmd_capabilities, 0 },
32 { "import", cmd_import, 1 },
33 { "list", cmd_list, 0 },
34 { NULL, NULL }
35};
36
37static int cmd_capabilities(const char *line)
38{
39 printf("import\n");
40 printf("bidi-import\n");
41 printf("refspec %s:%s\n\n", remote_ref, private_ref);
42 fflush(stdout);
43 return 0;
44}
45
46static void terminate_batch(void)
47{
48 /* terminate a current batch's fast-import stream */
49 printf("done\n");
50 fflush(stdout);
51}
52
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53/* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
54static char *read_ref_note(const unsigned char sha1[20])
55{
56 const unsigned char *note_sha1;
57 char *msg = NULL;
58 unsigned long msglen;
59 enum object_type type;
60
61 init_notes(NULL, notes_ref, NULL, 0);
62 if (!(note_sha1 = get_note(NULL, sha1)))
63 return NULL; /* note tree not found */
64 if (!(msg = read_sha1_file(note_sha1, &type, &msglen)))
65 error("Empty notes tree. %s", notes_ref);
66 else if (!msglen || type != OBJ_BLOB) {
67 error("Note contains unusable content. "
68 "Is something else using this notes tree? %s", notes_ref);
69 free(msg);
70 msg = NULL;
71 }
72 free_notes(NULL);
73 return msg;
74}
75
76static int parse_rev_note(const char *msg, struct rev_note *res)
77{
78 const char *key, *value, *end;
79 size_t len;
80
81 while (*msg) {
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82 end = strchrnul(msg, '\n');
83 len = end - msg;
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84
85 key = "Revision-number: ";
59556548 86 if (starts_with(msg, key)) {
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87 long i;
88 char *end;
89 value = msg + strlen(key);
90 i = strtol(value, &end, 0);
91 if (end == value || i < 0 || i > UINT32_MAX)
92 return -1;
93 res->rev_nr = i;
bfae342c 94 return 0;
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95 }
96 msg += len + 1;
97 }
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98 /* didn't find it */
99 return -1;
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100}
101
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102static int note2mark_cb(const unsigned char *object_sha1,
103 const unsigned char *note_sha1, char *note_path,
104 void *cb_data)
105{
106 FILE *file = (FILE *)cb_data;
107 char *msg;
108 unsigned long msglen;
109 enum object_type type;
110 struct rev_note note;
111
112 if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) ||
113 !msglen || type != OBJ_BLOB) {
114 free(msg);
115 return 1;
116 }
117 if (parse_rev_note(msg, &note))
118 return 2;
119 if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
120 return 3;
121 return 0;
122}
123
124static void regenerate_marks(void)
125{
126 int ret;
127 FILE *marksfile = fopen(marksfilename, "w+");
128
129 if (!marksfile)
130 die_errno("Couldn't create mark file %s.", marksfilename);
131 ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
132 if (ret)
133 die("Regeneration of marks failed, returned %d.", ret);
134 fclose(marksfile);
135}
136
137static void check_or_regenerate_marks(int latestrev)
138{
139 FILE *marksfile;
140 struct strbuf sb = STRBUF_INIT;
141 struct strbuf line = STRBUF_INIT;
142 int found = 0;
143
144 if (latestrev < 1)
145 return;
146
147 init_notes(NULL, notes_ref, NULL, 0);
148 marksfile = fopen(marksfilename, "r");
149 if (!marksfile) {
150 regenerate_marks();
151 marksfile = fopen(marksfilename, "r");
152 if (!marksfile)
153 die_errno("cannot read marks file %s!", marksfilename);
154 fclose(marksfile);
155 } else {
156 strbuf_addf(&sb, ":%d ", latestrev);
8f309aeb 157 while (strbuf_getline_lf(&line, marksfile) != EOF) {
59556548 158 if (starts_with(line.buf, sb.buf)) {
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159 found++;
160 break;
161 }
162 }
163 fclose(marksfile);
164 if (!found)
165 regenerate_marks();
166 }
167 free_notes(NULL);
168 strbuf_release(&sb);
169 strbuf_release(&line);
170}
171
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172static int cmd_import(const char *line)
173{
174 int code;
175 int dumpin_fd;
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176 char *note_msg;
177 unsigned char head_sha1[20];
178 unsigned int startrev;
d3180279 179 struct child_process svndump_proc = CHILD_PROCESS_INIT;
1cefa143 180 const char *command = "svnrdump";
68f64ff8 181
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182 if (read_ref(private_ref, head_sha1))
183 startrev = 0;
184 else {
185 note_msg = read_ref_note(head_sha1);
186 if(note_msg == NULL) {
187 warning("No note found for %s.", private_ref);
188 startrev = 0;
189 } else {
190 struct rev_note note = { 0 };
191 if (parse_rev_note(note_msg, &note))
192 die("Revision number couldn't be parsed from note.");
193 startrev = note.rev_nr + 1;
194 free(note_msg);
195 }
196 }
5bfc76b5 197 check_or_regenerate_marks(startrev - 1);
8e43a1d0 198
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199 if (dump_from_file) {
200 dumpin_fd = open(url, O_RDONLY);
201 if(dumpin_fd < 0)
202 die_errno("Couldn't open svn dump file %s.", url);
203 } else {
f6529de9 204 svndump_proc.out = -1;
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205 argv_array_push(&svndump_proc.args, command);
206 argv_array_push(&svndump_proc.args, "dump");
207 argv_array_push(&svndump_proc.args, url);
208 argv_array_pushf(&svndump_proc.args, "-r%u:HEAD", startrev);
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209
210 code = start_command(&svndump_proc);
211 if (code)
1cefa143 212 die("Unable to start %s, code %d", command, code);
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213 dumpin_fd = svndump_proc.out;
214 }
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215 /* setup marks file import/export */
216 printf("feature import-marks-if-exists=%s\n"
217 "feature export-marks=%s\n", marksfilename, marksfilename);
218
68f64ff8 219 svndump_init_fd(dumpin_fd, STDIN_FILENO);
8e43a1d0 220 svndump_read(url, private_ref, notes_ref);
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221 svndump_deinit();
222 svndump_reset();
223
224 close(dumpin_fd);
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225 if (!dump_from_file) {
226 code = finish_command(&svndump_proc);
227 if (code)
1cefa143 228 warning("%s, returned %d", command, code);
f6529de9 229 }
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230
231 return 0;
232}
233
234static int cmd_list(const char *line)
235{
236 printf("? %s\n\n", remote_ref);
237 fflush(stdout);
238 return 0;
239}
240
241static int do_command(struct strbuf *line)
242{
243 const struct input_command_entry *p = input_command_list;
244 static struct string_list batchlines = STRING_LIST_INIT_DUP;
245 static const struct input_command_entry *batch_cmd;
246 /*
247 * commands can be grouped together in a batch.
248 * Batches are ended by \n. If no batch is active the program ends.
249 * During a batch all lines are buffered and passed to the handler function
250 * when the batch is terminated.
251 */
252 if (line->len == 0) {
253 if (batch_cmd) {
254 struct string_list_item *item;
255 for_each_string_list_item(item, &batchlines)
256 batch_cmd->fn(item->string);
257 terminate_batch();
258 batch_cmd = NULL;
259 string_list_clear(&batchlines, 0);
260 return 0; /* end of the batch, continue reading other commands. */
261 }
262 return 1; /* end of command stream, quit */
263 }
264 if (batch_cmd) {
59556548 265 if (!starts_with(batch_cmd->name, line->buf))
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266 die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
267 /* buffer batch lines */
268 string_list_append(&batchlines, line->buf);
269 return 0;
270 }
271
272 for (p = input_command_list; p->name; p++) {
59556548 273 if (starts_with(line->buf, p->name) && (strlen(p->name) == line->len ||
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274 line->buf[strlen(p->name)] == ' ')) {
275 if (p->batchable) {
276 batch_cmd = p;
277 string_list_append(&batchlines, line->buf);
278 return 0;
279 }
280 return p->fn(line->buf);
281 }
282 }
283 die("Unknown command '%s'\n", line->buf);
284 return 0;
285}
286
84d32bf7 287int main(int argc, char **argv)
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288{
289 struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
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290 private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
291 notes_ref_sb = STRBUF_INIT;
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292 static struct remote *remote;
293 const char *url_in;
294
295 git_extract_argv0_path(argv[0]);
296 setup_git_directory();
297 if (argc < 2 || argc > 3) {
298 usage("git-remote-svn <remote-name> [<url>]");
299 return 1;
300 }
301
302 remote = remote_get(argv[1]);
303 url_in = (argc == 3) ? argv[2] : remote->url[0];
304
59556548 305 if (starts_with(url_in, "file://")) {
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306 dump_from_file = 1;
307 url = url_decode(url_in + sizeof("file://")-1);
308 } else {
309 dump_from_file = 0;
310 end_url_with_slash(&url_sb, url_in);
311 url = url_sb.buf;
312 }
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313
314 strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
315 private_ref = private_ref_sb.buf;
316
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317 strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
318 notes_ref = notes_ref_sb.buf;
319
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320 strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
321 get_git_dir(), remote->name);
322 marksfilename = marksfilename_sb.buf;
323
68f64ff8 324 while (1) {
8f309aeb 325 if (strbuf_getline_lf(&buf, stdin) == EOF) {
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FA
326 if (ferror(stdin))
327 die("Error reading command stream");
328 else
329 die("Unexpected end of command stream");
330 }
331 if (do_command(&buf))
332 break;
333 strbuf_reset(&buf);
334 }
335
336 strbuf_release(&buf);
337 strbuf_release(&url_sb);
338 strbuf_release(&private_ref_sb);
8e43a1d0 339 strbuf_release(&notes_ref_sb);
8d7cd8eb 340 strbuf_release(&marksfilename_sb);
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341 return 0;
342}