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 main(int argc, 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 (starts_with(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_lf(&buf, stdin) == 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 }