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                         return 0;
  94                 }
  95                 msg += len + 1;
  96         }
  97         /* didn't find it */
  98         return -1;
  99 }
 100
 101 static int note2mark_cb(const unsigned char *object_sha1,
 102                 const unsigned char *note_sha1, char *note_path,
 103                 void *cb_data)
 104 {
 105         FILE *file = (FILE *)cb_data;
 106         char *msg;
 107         unsigned long msglen;
 108         enum object_type type;
 109         struct rev_note note;
 110
 111         if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) ||
 112                         !msglen || type != OBJ_BLOB) {
 113                 free(msg);
 114                 return 1;
 115         }
 116         if (parse_rev_note(msg, &note))
 117                 return 2;
 118         if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
 119                 return 3;
 120         return 0;
 121 }
 122
 123 static void regenerate_marks(void)
 124 {
 125         int ret;
 126         FILE *marksfile = fopen(marksfilename, "w+");
 127
 128         if (!marksfile)
 129                 die_errno("Couldn't create mark file %s.", marksfilename);
 130         ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
 131         if (ret)
 132                 die("Regeneration of marks failed, returned %d.", ret);
 133         fclose(marksfile);
 134 }
 135
 136 static void check_or_regenerate_marks(int latestrev)
 137 {
 138         FILE *marksfile;
 139         struct strbuf sb = STRBUF_INIT;
 140         struct strbuf line = STRBUF_INIT;
 141         int found = 0;
 142
 143         if (latestrev < 1)
 144                 return;
 145
 146         init_notes(NULL, notes_ref, NULL, 0);
 147         marksfile = fopen(marksfilename, "r");
 148         if (!marksfile) {
 149                 regenerate_marks();
 150                 marksfile = fopen(marksfilename, "r");
 151                 if (!marksfile)
 152                         die_errno("cannot read marks file %s!", marksfilename);
 153                 fclose(marksfile);
 154         } else {
 155                 strbuf_addf(&sb, ":%d ", latestrev);
 156                 while (strbuf_getline(&line, marksfile, '\n') != EOF) {
 157                         if (!prefixcmp(line.buf, sb.buf)) {
 158                                 found++;
 159                                 break;
 160                         }
 161                 }
 162                 fclose(marksfile);
 163                 if (!found)
 164                         regenerate_marks();
 165         }
 166         free_notes(NULL);
 167         strbuf_release(&sb);
 168         strbuf_release(&line);
 169 }
 170
 171 static int cmd_import(const char *line)
 172 {
 173         int code;
 174         int dumpin_fd;
 175         char *note_msg;
 176         unsigned char head_sha1[20];
 177         unsigned int startrev;
 178         struct argv_array svndump_argv = ARGV_ARRAY_INIT;
 179         struct child_process svndump_proc;
 180
 181         if (read_ref(private_ref, head_sha1))
 182                 startrev = 0;
 183         else {
 184                 note_msg = read_ref_note(head_sha1);
 185                 if(note_msg == NULL) {
 186                         warning("No note found for %s.", private_ref);
 187                         startrev = 0;
 188                 } else {
 189                         struct rev_note note = { 0 };
 190                         if (parse_rev_note(note_msg, &note))
 191                                 die("Revision number couldn't be parsed from note.");
 192                         startrev = note.rev_nr + 1;
 193                         free(note_msg);
 194                 }
 195         }
 196         check_or_regenerate_marks(startrev - 1);
 197
 198         if (dump_from_file) {
 199                 dumpin_fd = open(url, O_RDONLY);
 200                 if(dumpin_fd < 0)
 201                         die_errno("Couldn't open svn dump file %s.", url);
 202         } else {
 203                 memset(&svndump_proc, 0, sizeof(struct child_process));
 204                 svndump_proc.out = -1;
 205                 argv_array_push(&svndump_argv, "svnrdump");
 206                 argv_array_push(&svndump_argv, "dump");
 207                 argv_array_push(&svndump_argv, url);
 208                 argv_array_pushf(&svndump_argv, "-r%u:HEAD", startrev);
 209                 svndump_proc.argv = svndump_argv.argv;
 210
 211                 code = start_command(&svndump_proc);
 212                 if (code)
 213                         die("Unable to start %s, code %d", svndump_proc.argv[0], code);
 214                 dumpin_fd = svndump_proc.out;
 215         }
 216         /* setup marks file import/export */
 217         printf("feature import-marks-if-exists=%s\n"
 218                         "feature export-marks=%s\n", marksfilename, marksfilename);
 219
 220         svndump_init_fd(dumpin_fd, STDIN_FILENO);
 221         svndump_read(url, private_ref, notes_ref);
 222         svndump_deinit();
 223         svndump_reset();
 224
 225         close(dumpin_fd);
 226         if (!dump_from_file) {
 227                 code = finish_command(&svndump_proc);
 228                 if (code)
 229                         warning("%s, returned %d", svndump_proc.argv[0], code);
 230                 argv_array_clear(&svndump_argv);
 231         }
 232
 233         return 0;
 234 }
 235
 236 static int cmd_list(const char *line)
 237 {
 238         printf("? %s\n\n", remote_ref);
 239         fflush(stdout);
 240         return 0;
 241 }
 242
 243 static int do_command(struct strbuf *line)
 244 {
 245         const struct input_command_entry *p = input_command_list;
 246         static struct string_list batchlines = STRING_LIST_INIT_DUP;
 247         static const struct input_command_entry *batch_cmd;
 248         /*
 249          * commands can be grouped together in a batch.
 250          * Batches are ended by \n. If no batch is active the program ends.
 251          * During a batch all lines are buffered and passed to the handler function
 252          * when the batch is terminated.
 253          */
 254         if (line->len == 0) {
 255                 if (batch_cmd) {
 256                         struct string_list_item *item;
 257                         for_each_string_list_item(item, &batchlines)
 258                                 batch_cmd->fn(item->string);
 259                         terminate_batch();
 260                         batch_cmd = NULL;
 261                         string_list_clear(&batchlines, 0);
 262                         return 0;       /* end of the batch, continue reading other commands. */
 263                 }
 264                 return 1;       /* end of command stream, quit */
 265         }
 266         if (batch_cmd) {
 267                 if (prefixcmp(batch_cmd->name, line->buf))
 268                         die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
 269                 /* buffer batch lines */
 270                 string_list_append(&batchlines, line->buf);
 271                 return 0;
 272         }
 273
 274         for (p = input_command_list; p->name; p++) {
 275                 if (!prefixcmp(line->buf, p->name) && (strlen(p->name) == line->len ||
 276                                 line->buf[strlen(p->name)] == ' ')) {
 277                         if (p->batchable) {
 278                                 batch_cmd = p;
 279                                 string_list_append(&batchlines, line->buf);
 280                                 return 0;
 281                         }
 282                         return p->fn(line->buf);
 283                 }
 284         }
 285         die("Unknown command '%s'\n", line->buf);
 286         return 0;
 287 }
 288
 289 int main(int argc, const char **argv)
 290 {
 291         struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
 292                         private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
 293                         notes_ref_sb = STRBUF_INIT;
 294         static struct remote *remote;
 295         const char *url_in;
 296
 297         git_extract_argv0_path(argv[0]);
 298         setup_git_directory();
 299         if (argc < 2 || argc > 3) {
 300                 usage("git-remote-svn <remote-name> [<url>]");
 301                 return 1;
 302         }
 303
 304         remote = remote_get(argv[1]);
 305         url_in = (argc == 3) ? argv[2] : remote->url[0];
 306
 307         if (!prefixcmp(url_in, "file://")) {
 308                 dump_from_file = 1;
 309                 url = url_decode(url_in + sizeof("file://")-1);
 310         } else {
 311                 dump_from_file = 0;
 312                 end_url_with_slash(&url_sb, url_in);
 313                 url = url_sb.buf;
 314         }
 315
 316         strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
 317         private_ref = private_ref_sb.buf;
 318
 319         strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
 320         notes_ref = notes_ref_sb.buf;
 321
 322         strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
 323                 get_git_dir(), remote->name);
 324         marksfilename = marksfilename_sb.buf;
 325
 326         while (1) {
 327                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 328                         if (ferror(stdin))
 329                                 die("Error reading command stream");
 330                         else
 331                                 die("Unexpected end of command stream");
 332                 }
 333                 if (do_command(&buf))
 334                         break;
 335                 strbuf_reset(&buf);
 336         }
 337
 338         strbuf_release(&buf);
 339         strbuf_release(&url_sb);
 340         strbuf_release(&private_ref_sb);
 341         strbuf_release(&notes_ref_sb);
 342         strbuf_release(&marksfilename_sb);
 343         return 0;
 344 }