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 "strvec.h"
  12
  13 static const char *url;
  14 static int dump_from_file;
  15 static const char *private_ref;
  16 static char *remote_ref;
  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                 strvec_push(&svndump_proc.args, command);
 202                 strvec_push(&svndump_proc.args, "dump");
 203                 strvec_push(&svndump_proc.args, url);
 204                 strvec_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, *remote_ref_short;
 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_ref_short = git_default_branch_name();
 298         remote_ref = xstrfmt("refs/heads/%s", remote_ref_short);
 299
 300         remote = remote_get(argv[1]);
 301         url_in = (argc == 3) ? argv[2] : remote->url[0];
 302
 303         if (starts_with(url_in, "file://")) {
 304                 dump_from_file = 1;
 305                 url = url_decode(url_in + sizeof("file://")-1);
 306         } else {
 307                 dump_from_file = 0;
 308                 end_url_with_slash(&url_sb, url_in);
 309                 url = url_sb.buf;
 310         }
 311
 312         strbuf_addf(&private_ref_sb, "refs/svn/%s/%s",
 313                     remote->name, remote_ref_short);
 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 }