From 68f64ff8b49ce5b32b11fe136ac89f0ba838a61c Mon Sep 17 00:00:00 2001 From: Florian Achleitner Date: Wed, 19 Sep 2012 17:21:15 +0200 Subject: Implement a remote helper for svn in C Enable basic fetching from subversion repositories. When processing remote URLs starting with testsvn::, git invokes this remote-helper. It starts svnrdump to extract revisions from the subversion repository in the 'dump file format', and converts them to a git-fast-import stream using the functions of vcs-svn/. Imported refs are created in a private namespace at refs/svn//master. The revision history is imported linearly (no branch detection) and completely, i.e. from revision 0 to HEAD. The 'bidi-import' capability is used. The remote-helper expects data from fast-import on its stdin. It buffers a batch of 'import' command lines in a string_list before starting to process them. Signed-off-by: Florian Achleitner Acked-by: David Michael Barr Signed-off-by: Junio C Hamano --- remote-testsvn.c | 176 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 176 insertions(+) create mode 100644 remote-testsvn.c (limited to 'remote-testsvn.c') diff --git a/remote-testsvn.c b/remote-testsvn.c new file mode 100644 index 000000000..c30ffcdb3 --- /dev/null +++ b/remote-testsvn.c @@ -0,0 +1,176 @@ +#include "cache.h" +#include "remote.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 const char *private_ref; +static const char *remote_ref = "refs/heads/master"; + +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); +} + +static int cmd_import(const char *line) +{ + int code; + int dumpin_fd; + unsigned int startrev = 0; + struct argv_array svndump_argv = ARGV_ARRAY_INIT; + struct child_process svndump_proc; + + memset(&svndump_proc, 0, sizeof(struct child_process)); + svndump_proc.out = -1; + argv_array_push(&svndump_argv, "svnrdump"); + argv_array_push(&svndump_argv, "dump"); + argv_array_push(&svndump_argv, url); + argv_array_pushf(&svndump_argv, "-r%u:HEAD", startrev); + svndump_proc.argv = svndump_argv.argv; + + code = start_command(&svndump_proc); + if (code) + die("Unable to start %s, code %d", svndump_proc.argv[0], code); + dumpin_fd = svndump_proc.out; + + svndump_init_fd(dumpin_fd, STDIN_FILENO); + svndump_read(url, private_ref); + svndump_deinit(); + svndump_reset(); + + close(dumpin_fd); + code = finish_command(&svndump_proc); + if (code) + warning("%s, returned %d", svndump_proc.argv[0], code); + argv_array_clear(&svndump_argv); + + 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 (prefixcmp(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 (!prefixcmp(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 main(int argc, const char **argv) +{ + struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT, + private_ref_sb = STRBUF_INIT; + static struct remote *remote; + const char *url_in; + + git_extract_argv0_path(argv[0]); + setup_git_directory(); + if (argc < 2 || argc > 3) { + usage("git-remote-svn []"); + return 1; + } + + remote = remote_get(argv[1]); + url_in = (argc == 3) ? argv[2] : remote->url[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; + + while (1) { + if (strbuf_getline(&buf, stdin, '\n') == 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); + return 0; +} -- cgit v1.2.1