git.oblomov.eu Git - git/blob - 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 struct object_id *oid)
  55 {
  56         const struct object_id *note_oid;
  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_oid = get_note(NULL, oid)))
  63                 return NULL;    /* note tree not found */
  64         if (!(msg = read_object_file(note_oid, &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_AND_NULL(msg);
  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 = strchrnul(msg, '\n');
  82                 len = end - msg;
  83
  84                 key = "Revision-number: ";
  85                 if (starts_with(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 struct object_id *object_oid,
 102                 const struct object_id *note_oid, 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_object_file(note_oid, &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, oid_to_hex(object_oid)) < 1)
 119                 return 3;
 120         return 0;
 121 }
 122
 123 static void regenerate_marks(void)
 124 {
 125         int ret;
 126         FILE *marksfile = xfopen(marksfilename, "w+");
 127
 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 = xfopen(marksfilename, "r");
 149                 fclose(marksfile);
 150         } else {
 151                 strbuf_addf(&sb, ":%d ", latestrev);
 152                 while (strbuf_getline_lf(&line, marksfile) != EOF) {
 153                         if (starts_with(line.buf, sb.buf)) {
 154                                 found++;
 155                                 break;
 156                         }
 157                 }
 158                 fclose(marksfile);
 159                 if (!found)
 160                         regenerate_marks();
 161         }
 162         free_notes(NULL);
 163         strbuf_release(&sb);
 164         strbuf_release(&line);
 165 }
 166
 167 static int cmd_import(const char *line)
 168 {
 169         int code;
 170         int dumpin_fd;
 171         char *note_msg;
 172         struct object_id head_oid;
 173         unsigned int startrev;
 174         struct child_process svndump_proc = CHILD_PROCESS_INIT;
 175         const char *command = "svnrdump";
 176
 177         if (read_ref(private_ref, &head_oid))
 178                 startrev = 0;
 179         else {
 180                 note_msg = read_ref_note(&head_oid);
 181                 if(note_msg == NULL) {
 182                         warning("No note found for %s.", private_ref);
 183                         startrev = 0;
 184                 } else {
 185                         struct rev_note note = { 0 };
 186                         if (parse_rev_note(note_msg, &note))
 187                                 die("Revision number couldn't be parsed from note.");
 188                         startrev = note.rev_nr + 1;
 189                         free(note_msg);
 190                 }
 191         }
 192         check_or_regenerate_marks(startrev - 1);
 193
 194         if (dump_from_file) {
 195                 dumpin_fd = open(url, O_RDONLY);
 196                 if(dumpin_fd < 0)
 197                         die_errno("Couldn't open svn dump file %s.", url);
 198         } else {
 199                 svndump_proc.out = -1;
 200                 argv_array_push(&svndump_proc.args, command);
 201                 argv_array_push(&svndump_proc.args, "dump");
 202                 argv_array_push(&svndump_proc.args, url);
 203                 argv_array_pushf(&svndump_proc.args, "-r%u:HEAD", startrev);
 204
 205                 code = start_command(&svndump_proc);
 206                 if (code)
 207                         die("Unable to start %s, code %d", command, code);
 208                 dumpin_fd = svndump_proc.out;
 209         }
 210         /* setup marks file import/export */
 211         printf("feature import-marks-if-exists=%s\n"
 212                         "feature export-marks=%s\n", marksfilename, marksfilename);
 213
 214         svndump_init_fd(dumpin_fd, STDIN_FILENO);
 215         svndump_read(url, private_ref, notes_ref);
 216         svndump_deinit();
 217         svndump_reset();
 218
 219         close(dumpin_fd);
 220         if (!dump_from_file) {
 221                 code = finish_command(&svndump_proc);
 222                 if (code)
 223                         warning("%s, returned %d", command, code);
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int cmd_list(const char *line)
 230 {
 231         printf("? %s\n\n", remote_ref);
 232         fflush(stdout);
 233         return 0;
 234 }
 235
 236 static int do_command(struct strbuf *line)
 237 {
 238         const struct input_command_entry *p = input_command_list;
 239         static struct string_list batchlines = STRING_LIST_INIT_DUP;
 240         static const struct input_command_entry *batch_cmd;
 241         /*
 242          * commands can be grouped together in a batch.
 243          * Batches are ended by \n. If no batch is active the program ends.
 244          * During a batch all lines are buffered and passed to the handler function
 245          * when the batch is terminated.
 246          */
 247         if (line->len == 0) {
 248                 if (batch_cmd) {
 249                         struct string_list_item *item;
 250                         for_each_string_list_item(item, &batchlines)
 251                                 batch_cmd->fn(item->string);
 252                         terminate_batch();
 253                         batch_cmd = NULL;
 254                         string_list_clear(&batchlines, 0);
 255                         return 0;       /* end of the batch, continue reading other commands. */
 256                 }
 257                 return 1;       /* end of command stream, quit */
 258         }
 259         if (batch_cmd) {
 260                 if (!starts_with(batch_cmd->name, line->buf))
 261                         die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
 262                 /* buffer batch lines */
 263                 string_list_append(&batchlines, line->buf);
 264                 return 0;
 265         }
 266
 267         for (p = input_command_list; p->name; p++) {
 268                 if (starts_with(line->buf, p->name) && (strlen(p->name) == line->len ||
 269                                 line->buf[strlen(p->name)] == ' ')) {
 270                         if (p->batchable) {
 271                                 batch_cmd = p;
 272                                 string_list_append(&batchlines, line->buf);
 273                                 return 0;
 274                         }
 275                         return p->fn(line->buf);
 276                 }
 277         }
 278         die("Unknown command '%s'\n", line->buf);
 279         return 0;
 280 }
 281
 282 int cmd_main(int argc, const char **argv)
 283 {
 284         struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
 285                         private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
 286                         notes_ref_sb = STRBUF_INIT;
 287         static struct remote *remote;
 288         const char *url_in;
 289
 290         setup_git_directory();
 291         if (argc < 2 || argc > 3) {
 292                 usage("git-remote-svn <remote-name> [<url>]");
 293                 return 1;
 294         }
 295
 296         remote = remote_get(argv[1]);
 297         url_in = (argc == 3) ? argv[2] : remote->url[0];
 298
 299         if (starts_with(url_in, "file://")) {
 300                 dump_from_file = 1;
 301                 url = url_decode(url_in + sizeof("file://")-1);
 302         } else {
 303                 dump_from_file = 0;
 304                 end_url_with_slash(&url_sb, url_in);
 305                 url = url_sb.buf;
 306         }
 307
 308         strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
 309         private_ref = private_ref_sb.buf;
 310
 311         strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
 312         notes_ref = notes_ref_sb.buf;
 313
 314         strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
 315                 get_git_dir(), remote->name);
 316         marksfilename = marksfilename_sb.buf;
 317
 318         while (1) {
 319                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
 320                         if (ferror(stdin))
 321                                 die("Error reading command stream");
 322                         else
 323                                 die("Unexpected end of command stream");
 324                 }
 325                 if (do_command(&buf))
 326                         break;
 327                 strbuf_reset(&buf);
 328         }
 329
 330         strbuf_release(&buf);
 331         strbuf_release(&url_sb);
 332         strbuf_release(&private_ref_sb);
 333         strbuf_release(&notes_ref_sb);
 334         strbuf_release(&marksfilename_sb);
 335         return 0;
 336 }