Merge branch 'sb/t3600-cleanup' into next
[git] / remote-testsvn.c
1 #include "cache.h"
2 #include "refs.h"
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
12 static const char *url;
13 static int dump_from_file;
14 static const char *private_ref;
15 static const char *remote_ref = "refs/heads/master";
16 static const char *marksfilename, *notes_ref;
17 struct rev_note { unsigned int rev_nr; };
18
19 static int cmd_capabilities(const char *line);
20 static int cmd_import(const char *line);
21 static int cmd_list(const char *line);
22
23 typedef int (*input_command_handler)(const char *);
24 struct 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
30 static 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
37 static 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
46 static void terminate_batch(void)
47 {
48         /* terminate a current batch's fast-import stream */
49         printf("done\n");
50         fflush(stdout);
51 }
52
53 /* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
54 static 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
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 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
124 static 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
137 static 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);
157                 while (strbuf_getline_lf(&line, marksfile) != EOF) {
158                         if (starts_with(line.buf, sb.buf)) {
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
172 static int cmd_import(const char *line)
173 {
174         int code;
175         int dumpin_fd;
176         char *note_msg;
177         unsigned char head_sha1[20];
178         unsigned int startrev;
179         struct child_process svndump_proc = CHILD_PROCESS_INIT;
180         const char *command = "svnrdump";
181
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         }
197         check_or_regenerate_marks(startrev - 1);
198
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 {
204                 svndump_proc.out = -1;
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);
209
210                 code = start_command(&svndump_proc);
211                 if (code)
212                         die("Unable to start %s, code %d", command, code);
213                 dumpin_fd = svndump_proc.out;
214         }
215         /* setup marks file import/export */
216         printf("feature import-marks-if-exists=%s\n"
217                         "feature export-marks=%s\n", marksfilename, marksfilename);
218
219         svndump_init_fd(dumpin_fd, STDIN_FILENO);
220         svndump_read(url, private_ref, notes_ref);
221         svndump_deinit();
222         svndump_reset();
223
224         close(dumpin_fd);
225         if (!dump_from_file) {
226                 code = finish_command(&svndump_proc);
227                 if (code)
228                         warning("%s, returned %d", command, code);
229         }
230
231         return 0;
232 }
233
234 static int cmd_list(const char *line)
235 {
236         printf("? %s\n\n", remote_ref);
237         fflush(stdout);
238         return 0;
239 }
240
241 static 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) {
265                 if (!starts_with(batch_cmd->name, line->buf))
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++) {
273                 if (starts_with(line->buf, p->name) && (strlen(p->name) == line->len ||
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
287 int cmd_main(int argc, const char **argv)
288 {
289         struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
290                         private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
291                         notes_ref_sb = STRBUF_INIT;
292         static struct remote *remote;
293         const char *url_in;
294
295         setup_git_directory();
296         if (argc < 2 || argc > 3) {
297                 usage("git-remote-svn <remote-name> [<url>]");
298                 return 1;
299         }
300
301         remote = remote_get(argv[1]);
302         url_in = (argc == 3) ? argv[2] : remote->url[0];
303
304         if (starts_with(url_in, "file://")) {
305                 dump_from_file = 1;
306                 url = url_decode(url_in + sizeof("file://")-1);
307         } else {
308                 dump_from_file = 0;
309                 end_url_with_slash(&url_sb, url_in);
310                 url = url_sb.buf;
311         }
312
313         strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
314         private_ref = private_ref_sb.buf;
315
316         strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
317         notes_ref = notes_ref_sb.buf;
318
319         strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
320                 get_git_dir(), remote->name);
321         marksfilename = marksfilename_sb.buf;
322
323         while (1) {
324                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
325                         if (ferror(stdin))
326                                 die("Error reading command stream");
327                         else
328                                 die("Unexpected end of command stream");
329                 }
330                 if (do_command(&buf))
331                         break;
332                 strbuf_reset(&buf);
333         }
334
335         strbuf_release(&buf);
336         strbuf_release(&url_sb);
337         strbuf_release(&private_ref_sb);
338         strbuf_release(&notes_ref_sb);
339         strbuf_release(&marksfilename_sb);
340         return 0;
341 }