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