diff options
Diffstat (limited to 'third_party/git/remote-testsvn.c')
| -rw-r--r-- | third_party/git/remote-testsvn.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/third_party/git/remote-testsvn.c b/third_party/git/remote-testsvn.c new file mode 100644 index 0000000000..3af708c5b6 --- /dev/null +++ b/third_party/git/remote-testsvn.c @@ -0,0 +1,337 @@ +#include "cache.h" +#include "refs.h" +#include "remote.h" +#include "object-store.h" +#include "strbuf.h" +#include "url.h" +#include "exec-cmd.h" +#include "run-command.h" +#include "vcs-svn/svndump.h" +#include "notes.h" +#include "argv-array.h" + +static const char *url; +static int dump_from_file; +static const char *private_ref; +static const char *remote_ref = "refs/heads/master"; +static const char *marksfilename, *notes_ref; +struct rev_note { unsigned int rev_nr; }; + +static int cmd_capabilities(const char *line); +static int cmd_import(const char *line); +static int cmd_list(const char *line); + +typedef int (*input_command_handler)(const char *); +struct input_command_entry { + const char *name; + input_command_handler fn; + unsigned char batchable; /* whether the command starts or is part of a batch */ +}; + +static const struct input_command_entry input_command_list[] = { + { "capabilities", cmd_capabilities, 0 }, + { "import", cmd_import, 1 }, + { "list", cmd_list, 0 }, + { NULL, NULL } +}; + +static int cmd_capabilities(const char *line) +{ + printf("import\n"); + printf("bidi-import\n"); + printf("refspec %s:%s\n\n", remote_ref, private_ref); + fflush(stdout); + return 0; +} + +static void terminate_batch(void) +{ + /* terminate a current batch's fast-import stream */ + printf("done\n"); + fflush(stdout); +} + +/* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */ +static char *read_ref_note(const struct object_id *oid) +{ + const struct object_id *note_oid; + char *msg = NULL; + unsigned long msglen; + enum object_type type; + + init_notes(NULL, notes_ref, NULL, 0); + if (!(note_oid = get_note(NULL, oid))) + return NULL; /* note tree not found */ + if (!(msg = read_object_file(note_oid, &type, &msglen))) + error("Empty notes tree. %s", notes_ref); + else if (!msglen || type != OBJ_BLOB) { + error("Note contains unusable content. " + "Is something else using this notes tree? %s", notes_ref); + FREE_AND_NULL(msg); + } + free_notes(NULL); + return msg; +} + +static int parse_rev_note(const char *msg, struct rev_note *res) +{ + const char *key, *value, *end; + size_t len; + + while (*msg) { + end = strchrnul(msg, '\n'); + len = end - msg; + + key = "Revision-number: "; + if (starts_with(msg, key)) { + long i; + char *end; + value = msg + strlen(key); + i = strtol(value, &end, 0); + if (end == value || i < 0 || i > UINT32_MAX) + return -1; + res->rev_nr = i; + return 0; + } + msg += len + 1; + } + /* didn't find it */ + return -1; +} + +static int note2mark_cb(const struct object_id *object_oid, + const struct object_id *note_oid, char *note_path, + void *cb_data) +{ + FILE *file = (FILE *)cb_data; + char *msg; + unsigned long msglen; + enum object_type type; + struct rev_note note; + + if (!(msg = read_object_file(note_oid, &type, &msglen)) || + !msglen || type != OBJ_BLOB) { + free(msg); + return 1; + } + if (parse_rev_note(msg, ¬e)) + return 2; + if (fprintf(file, ":%d %s\n", note.rev_nr, oid_to_hex(object_oid)) < 1) + return 3; + return 0; +} + +static void regenerate_marks(void) +{ + int ret; + FILE *marksfile = xfopen(marksfilename, "w+"); + + ret = for_each_note(NULL, 0, note2mark_cb, marksfile); + if (ret) + die("Regeneration of marks failed, returned %d.", ret); + fclose(marksfile); +} + +static void check_or_regenerate_marks(int latestrev) +{ + FILE *marksfile; + struct strbuf sb = STRBUF_INIT; + struct strbuf line = STRBUF_INIT; + int found = 0; + + if (latestrev < 1) + return; + + init_notes(NULL, notes_ref, NULL, 0); + marksfile = fopen(marksfilename, "r"); + if (!marksfile) { + regenerate_marks(); + marksfile = xfopen(marksfilename, "r"); + fclose(marksfile); + } else { + strbuf_addf(&sb, ":%d ", latestrev); + while (strbuf_getline_lf(&line, marksfile) != EOF) { + if (starts_with(line.buf, sb.buf)) { + found++; + break; + } + } + fclose(marksfile); + if (!found) + regenerate_marks(); + } + free_notes(NULL); + strbuf_release(&sb); + strbuf_release(&line); +} + +static int cmd_import(const char *line) +{ + int code; + int dumpin_fd; + char *note_msg; + struct object_id head_oid; + unsigned int startrev; + struct child_process svndump_proc = CHILD_PROCESS_INIT; + const char *command = "svnrdump"; + + if (read_ref(private_ref, &head_oid)) + startrev = 0; + else { + note_msg = read_ref_note(&head_oid); + if(note_msg == NULL) { + warning("No note found for %s.", private_ref); + startrev = 0; + } else { + struct rev_note note = { 0 }; + if (parse_rev_note(note_msg, ¬e)) + die("Revision number couldn't be parsed from note."); + startrev = note.rev_nr + 1; + free(note_msg); + } + } + check_or_regenerate_marks(startrev - 1); + + if (dump_from_file) { + dumpin_fd = open(url, O_RDONLY); + if(dumpin_fd < 0) + die_errno("Couldn't open svn dump file %s.", url); + } else { + svndump_proc.out = -1; + argv_array_push(&svndump_proc.args, command); + argv_array_push(&svndump_proc.args, "dump"); + argv_array_push(&svndump_proc.args, url); + argv_array_pushf(&svndump_proc.args, "-r%u:HEAD", startrev); + + code = start_command(&svndump_proc); + if (code) + die("Unable to start %s, code %d", command, code); + dumpin_fd = svndump_proc.out; + } + /* setup marks file import/export */ + printf("feature import-marks-if-exists=%s\n" + "feature export-marks=%s\n", marksfilename, marksfilename); + + svndump_init_fd(dumpin_fd, STDIN_FILENO); + svndump_read(url, private_ref, notes_ref); + svndump_deinit(); + svndump_reset(); + + close(dumpin_fd); + if (!dump_from_file) { + code = finish_command(&svndump_proc); + if (code) + warning("%s, returned %d", command, code); + } + + return 0; +} + +static int cmd_list(const char *line) +{ + printf("? %s\n\n", remote_ref); + fflush(stdout); + return 0; +} + +static int do_command(struct strbuf *line) +{ + const struct input_command_entry *p = input_command_list; + static struct string_list batchlines = STRING_LIST_INIT_DUP; + static const struct input_command_entry *batch_cmd; + /* + * commands can be grouped together in a batch. + * Batches are ended by \n. If no batch is active the program ends. + * During a batch all lines are buffered and passed to the handler function + * when the batch is terminated. + */ + if (line->len == 0) { + if (batch_cmd) { + struct string_list_item *item; + for_each_string_list_item(item, &batchlines) + batch_cmd->fn(item->string); + terminate_batch(); + batch_cmd = NULL; + string_list_clear(&batchlines, 0); + return 0; /* end of the batch, continue reading other commands. */ + } + return 1; /* end of command stream, quit */ + } + if (batch_cmd) { + if (!starts_with(batch_cmd->name, line->buf)) + die("Active %s batch interrupted by %s", batch_cmd->name, line->buf); + /* buffer batch lines */ + string_list_append(&batchlines, line->buf); + return 0; + } + + for (p = input_command_list; p->name; p++) { + if (starts_with(line->buf, p->name) && (strlen(p->name) == line->len || + line->buf[strlen(p->name)] == ' ')) { + if (p->batchable) { + batch_cmd = p; + string_list_append(&batchlines, line->buf); + return 0; + } + return p->fn(line->buf); + } + } + die("Unknown command '%s'\n", line->buf); + return 0; +} + +int cmd_main(int argc, const char **argv) +{ + struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT, + private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT, + notes_ref_sb = STRBUF_INIT; + static struct remote *remote; + const char *url_in; + + setup_git_directory(); + if (argc < 2 || argc > 3) { + usage("git-remote-svn <remote-name> [<url>]"); + return 1; + } + + remote = remote_get(argv[1]); + url_in = (argc == 3) ? argv[2] : remote->url[0]; + + if (starts_with(url_in, "file://")) { + dump_from_file = 1; + url = url_decode(url_in + sizeof("file://")-1); + } else { + dump_from_file = 0; + end_url_with_slash(&url_sb, url_in); + url = url_sb.buf; + } + + strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name); + private_ref = private_ref_sb.buf; + + strbuf_addf(¬es_ref_sb, "refs/notes/%s/revs", remote->name); + notes_ref = notes_ref_sb.buf; + + strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks", + get_git_dir(), remote->name); + marksfilename = marksfilename_sb.buf; + + while (1) { + if (strbuf_getline_lf(&buf, stdin) == EOF) { + if (ferror(stdin)) + die("Error reading command stream"); + else + die("Unexpected end of command stream"); + } + if (do_command(&buf)) + break; + strbuf_reset(&buf); + } + + strbuf_release(&buf); + strbuf_release(&url_sb); + strbuf_release(&private_ref_sb); + strbuf_release(¬es_ref_sb); + strbuf_release(&marksfilename_sb); + return 0; +} |