Andrew's git - gitweb.git/blob

   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
  11static const char *url;
  12static int dump_from_file;
  13static const char *private_ref;
  14static const char *remote_ref = "refs/heads/master";
  15static const char *marksfilename, *notes_ref;
  16struct rev_note { unsigned int rev_nr; };
  17
  18static int cmd_capabilities(const char *line);
  19static int cmd_import(const char *line);
  20static int cmd_list(const char *line);
  21
  22typedef int (*input_command_handler)(const char *);
  23struct 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
  29static 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
  36static 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
  45static 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. */
  53static 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
  75static 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
  99static int cmd_import(const char *line)
 100{
 101        int code;
 102        int dumpin_fd;
 103        char *note_msg;
 104        unsigned char head_sha1[20];
 105        unsigned int startrev;
 106        struct argv_array svndump_argv = ARGV_ARRAY_INIT;
 107        struct child_process svndump_proc;
 108
 109        if (read_ref(private_ref, head_sha1))
 110                startrev = 0;
 111        else {
 112                note_msg = read_ref_note(head_sha1);
 113                if(note_msg == NULL) {
 114                        warning("No note found for %s.", private_ref);
 115                        startrev = 0;
 116                } else {
 117                        struct rev_note note = { 0 };
 118                        if (parse_rev_note(note_msg, &note))
 119                                die("Revision number couldn't be parsed from note.");
 120                        startrev = note.rev_nr + 1;
 121                        free(note_msg);
 122                }
 123        }
 124
 125        if (dump_from_file) {
 126                dumpin_fd = open(url, O_RDONLY);
 127                if(dumpin_fd < 0)
 128                        die_errno("Couldn't open svn dump file %s.", url);
 129        } else {
 130                memset(&svndump_proc, 0, sizeof(struct child_process));
 131                svndump_proc.out = -1;
 132                argv_array_push(&svndump_argv, "svnrdump");
 133                argv_array_push(&svndump_argv, "dump");
 134                argv_array_push(&svndump_argv, url);
 135                argv_array_pushf(&svndump_argv, "-r%u:HEAD", startrev);
 136                svndump_proc.argv = svndump_argv.argv;
 137
 138                code = start_command(&svndump_proc);
 139                if (code)
 140                        die("Unable to start %s, code %d", svndump_proc.argv[0], code);
 141                dumpin_fd = svndump_proc.out;
 142        }
 143        /* setup marks file import/export */
 144        printf("feature import-marks-if-exists=%s\n"
 145                        "feature export-marks=%s\n", marksfilename, marksfilename);
 146
 147        svndump_init_fd(dumpin_fd, STDIN_FILENO);
 148        svndump_read(url, private_ref, notes_ref);
 149        svndump_deinit();
 150        svndump_reset();
 151
 152        close(dumpin_fd);
 153        if (!dump_from_file) {
 154                code = finish_command(&svndump_proc);
 155                if (code)
 156                        warning("%s, returned %d", svndump_proc.argv[0], code);
 157                argv_array_clear(&svndump_argv);
 158        }
 159
 160        return 0;
 161}
 162
 163static int cmd_list(const char *line)
 164{
 165        printf("? %s\n\n", remote_ref);
 166        fflush(stdout);
 167        return 0;
 168}
 169
 170static int do_command(struct strbuf *line)
 171{
 172        const struct input_command_entry *p = input_command_list;
 173        static struct string_list batchlines = STRING_LIST_INIT_DUP;
 174        static const struct input_command_entry *batch_cmd;
 175        /*
 176         * commands can be grouped together in a batch.
 177         * Batches are ended by \n. If no batch is active the program ends.
 178         * During a batch all lines are buffered and passed to the handler function
 179         * when the batch is terminated.
 180         */
 181        if (line->len == 0) {
 182                if (batch_cmd) {
 183                        struct string_list_item *item;
 184                        for_each_string_list_item(item, &batchlines)
 185                                batch_cmd->fn(item->string);
 186                        terminate_batch();
 187                        batch_cmd = NULL;
 188                        string_list_clear(&batchlines, 0);
 189                        return 0;       /* end of the batch, continue reading other commands. */
 190                }
 191                return 1;       /* end of command stream, quit */
 192        }
 193        if (batch_cmd) {
 194                if (prefixcmp(batch_cmd->name, line->buf))
 195                        die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
 196                /* buffer batch lines */
 197                string_list_append(&batchlines, line->buf);
 198                return 0;
 199        }
 200
 201        for (p = input_command_list; p->name; p++) {
 202                if (!prefixcmp(line->buf, p->name) && (strlen(p->name) == line->len ||
 203                                line->buf[strlen(p->name)] == ' ')) {
 204                        if (p->batchable) {
 205                                batch_cmd = p;
 206                                string_list_append(&batchlines, line->buf);
 207                                return 0;
 208                        }
 209                        return p->fn(line->buf);
 210                }
 211        }
 212        die("Unknown command '%s'\n", line->buf);
 213        return 0;
 214}
 215
 216int main(int argc, const char **argv)
 217{
 218        struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
 219                        private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
 220                        notes_ref_sb = STRBUF_INIT;
 221        static struct remote *remote;
 222        const char *url_in;
 223
 224        git_extract_argv0_path(argv[0]);
 225        setup_git_directory();
 226        if (argc < 2 || argc > 3) {
 227                usage("git-remote-svn <remote-name> [<url>]");
 228                return 1;
 229        }
 230
 231        remote = remote_get(argv[1]);
 232        url_in = (argc == 3) ? argv[2] : remote->url[0];
 233
 234        if (!prefixcmp(url_in, "file://")) {
 235                dump_from_file = 1;
 236                url = url_decode(url_in + sizeof("file://")-1);
 237        } else {
 238                dump_from_file = 0;
 239                end_url_with_slash(&url_sb, url_in);
 240                url = url_sb.buf;
 241        }
 242
 243        strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
 244        private_ref = private_ref_sb.buf;
 245
 246        strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
 247        notes_ref = notes_ref_sb.buf;
 248
 249        strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
 250                get_git_dir(), remote->name);
 251        marksfilename = marksfilename_sb.buf;
 252
 253        while (1) {
 254                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 255                        if (ferror(stdin))
 256                                die("Error reading command stream");
 257                        else
 258                                die("Unexpected end of command stream");
 259                }
 260                if (do_command(&buf))
 261                        break;
 262                strbuf_reset(&buf);
 263        }
 264
 265        strbuf_release(&buf);
 266        strbuf_release(&url_sb);
 267        strbuf_release(&private_ref_sb);
 268        strbuf_release(&notes_ref_sb);
 269        strbuf_release(&marksfilename_sb);
 270        return 0;
 271}