Merge branch 'jk/maint-http-half-auth-fetch'
[git] / remote-testsvn.c
1 #include "cache.h"
2 #include "remote.h"
3 #include "strbuf.h"
4 #include "url.h"
5 #include "exec_cmd.h"
6 #include "run-command.h"
7 #include "vcs-svn/svndump.h"
8 #include "notes.h"
9 #include "argv-array.h"
10
11 static const char *url;
12 static int dump_from_file;
13 static const char *private_ref;
14 static const char *remote_ref = "refs/heads/master";
15 static const char *marksfilename, *notes_ref;
16 struct rev_note { unsigned int rev_nr; };
17
18 static int cmd_capabilities(const char *line);
19 static int cmd_import(const char *line);
20 static int cmd_list(const char *line);
21
22 typedef int (*input_command_handler)(const char *);
23 struct input_command_entry {
24         const char *name;
25         input_command_handler fn;
26         unsigned char batchable;        /* whether the command starts or is part of a batch */
27 };
28
29 static const struct input_command_entry input_command_list[] = {
30         { "capabilities", cmd_capabilities, 0 },
31         { "import", cmd_import, 1 },
32         { "list", cmd_list, 0 },
33         { NULL, NULL }
34 };
35
36 static int cmd_capabilities(const char *line)
37 {
38         printf("import\n");
39         printf("bidi-import\n");
40         printf("refspec %s:%s\n\n", remote_ref, private_ref);
41         fflush(stdout);
42         return 0;
43 }
44
45 static void terminate_batch(void)
46 {
47         /* terminate a current batch's fast-import stream */
48         printf("done\n");
49         fflush(stdout);
50 }
51
52 /* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
53 static char *read_ref_note(const unsigned char sha1[20])
54 {
55         const unsigned char *note_sha1;
56         char *msg = NULL;
57         unsigned long msglen;
58         enum object_type type;
59
60         init_notes(NULL, notes_ref, NULL, 0);
61         if (!(note_sha1 = get_note(NULL, sha1)))
62                 return NULL;    /* note tree not found */
63         if (!(msg = read_sha1_file(note_sha1, &type, &msglen)))
64                 error("Empty notes tree. %s", notes_ref);
65         else if (!msglen || type != OBJ_BLOB) {
66                 error("Note contains unusable content. "
67                         "Is something else using this notes tree? %s", notes_ref);
68                 free(msg);
69                 msg = NULL;
70         }
71         free_notes(NULL);
72         return msg;
73 }
74
75 static int parse_rev_note(const char *msg, struct rev_note *res)
76 {
77         const char *key, *value, *end;
78         size_t len;
79
80         while (*msg) {
81                 end = strchr(msg, '\n');
82                 len = end ? end - msg : strlen(msg);
83
84                 key = "Revision-number: ";
85                 if (!prefixcmp(msg, key)) {
86                         long i;
87                         char *end;
88                         value = msg + strlen(key);
89                         i = strtol(value, &end, 0);
90                         if (end == value || i < 0 || i > UINT32_MAX)
91                                 return -1;
92                         res->rev_nr = i;
93                 }
94                 msg += len + 1;
95         }
96         return 0;
97 }
98
99 static int note2mark_cb(const unsigned char *object_sha1,
100                 const unsigned char *note_sha1, char *note_path,
101                 void *cb_data)
102 {
103         FILE *file = (FILE *)cb_data;
104         char *msg;
105         unsigned long msglen;
106         enum object_type type;
107         struct rev_note note;
108
109         if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) ||
110                         !msglen || type != OBJ_BLOB) {
111                 free(msg);
112                 return 1;
113         }
114         if (parse_rev_note(msg, &note))
115                 return 2;
116         if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
117                 return 3;
118         return 0;
119 }
120
121 static void regenerate_marks(void)
122 {
123         int ret;
124         FILE *marksfile = fopen(marksfilename, "w+");
125
126         if (!marksfile)
127                 die_errno("Couldn't create mark file %s.", marksfilename);
128         ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
129         if (ret)
130                 die("Regeneration of marks failed, returned %d.", ret);
131         fclose(marksfile);
132 }
133
134 static void check_or_regenerate_marks(int latestrev)
135 {
136         FILE *marksfile;
137         struct strbuf sb = STRBUF_INIT;
138         struct strbuf line = STRBUF_INIT;
139         int found = 0;
140
141         if (latestrev < 1)
142                 return;
143
144         init_notes(NULL, notes_ref, NULL, 0);
145         marksfile = fopen(marksfilename, "r");
146         if (!marksfile) {
147                 regenerate_marks();
148                 marksfile = fopen(marksfilename, "r");
149                 if (!marksfile)
150                         die_errno("cannot read marks file %s!", marksfilename);
151                 fclose(marksfile);
152         } else {
153                 strbuf_addf(&sb, ":%d ", latestrev);
154                 while (strbuf_getline(&line, marksfile, '\n') != EOF) {
155                         if (!prefixcmp(line.buf, sb.buf)) {
156                                 found++;
157                                 break;
158                         }
159                 }
160                 fclose(marksfile);
161                 if (!found)
162                         regenerate_marks();
163         }
164         free_notes(NULL);
165         strbuf_release(&sb);
166         strbuf_release(&line);
167 }
168
169 static int cmd_import(const char *line)
170 {
171         int code;
172         int dumpin_fd;
173         char *note_msg;
174         unsigned char head_sha1[20];
175         unsigned int startrev;
176         struct argv_array svndump_argv = ARGV_ARRAY_INIT;
177         struct child_process svndump_proc;
178
179         if (read_ref(private_ref, head_sha1))
180                 startrev = 0;
181         else {
182                 note_msg = read_ref_note(head_sha1);
183                 if(note_msg == NULL) {
184                         warning("No note found for %s.", private_ref);
185                         startrev = 0;
186                 } else {
187                         struct rev_note note = { 0 };
188                         if (parse_rev_note(note_msg, &note))
189                                 die("Revision number couldn't be parsed from note.");
190                         startrev = note.rev_nr + 1;
191                         free(note_msg);
192                 }
193         }
194         check_or_regenerate_marks(startrev - 1);
195
196         if (dump_from_file) {
197                 dumpin_fd = open(url, O_RDONLY);
198                 if(dumpin_fd < 0)
199                         die_errno("Couldn't open svn dump file %s.", url);
200         } else {
201                 memset(&svndump_proc, 0, sizeof(struct child_process));
202                 svndump_proc.out = -1;
203                 argv_array_push(&svndump_argv, "svnrdump");
204                 argv_array_push(&svndump_argv, "dump");
205                 argv_array_push(&svndump_argv, url);
206                 argv_array_pushf(&svndump_argv, "-r%u:HEAD", startrev);
207                 svndump_proc.argv = svndump_argv.argv;
208
209                 code = start_command(&svndump_proc);
210                 if (code)
211                         die("Unable to start %s, code %d", svndump_proc.argv[0], code);
212                 dumpin_fd = svndump_proc.out;
213         }
214         /* setup marks file import/export */
215         printf("feature import-marks-if-exists=%s\n"
216                         "feature export-marks=%s\n", marksfilename, marksfilename);
217
218         svndump_init_fd(dumpin_fd, STDIN_FILENO);
219         svndump_read(url, private_ref, notes_ref);
220         svndump_deinit();
221         svndump_reset();
222
223         close(dumpin_fd);
224         if (!dump_from_file) {
225                 code = finish_command(&svndump_proc);
226                 if (code)
227                         warning("%s, returned %d", svndump_proc.argv[0], code);
228                 argv_array_clear(&svndump_argv);
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 (prefixcmp(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 (!prefixcmp(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 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         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
305         if (!prefixcmp(url_in, "file://")) {
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         }
313
314         strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
315         private_ref = private_ref_sb.buf;
316
317         strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
318         notes_ref = notes_ref_sb.buf;
319
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
324         while (1) {
325                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
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);
339         strbuf_release(&notes_ref_sb);
340         strbuf_release(&marksfilename_sb);
341         return 0;
342 }