Enables basic fetching from subversion repositories. When processing Remote URLs
starting with svn::, 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/<remote-name/master.
The revision history is imported linearly (no branch detection) and completely,
i.e. from revision 0 to HEAD.
Signed-off-by: Florian Achleitner <florian.achleitner.2.6.31@xxxxxxxxx>
---
contrib/svn-fe/remote-svn.c | 219 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 219 insertions(+)
create mode 100644 contrib/svn-fe/remote-svn.c
diff --git a/contrib/svn-fe/remote-svn.c b/contrib/svn-fe/remote-svn.c
new file mode 100644
index 0000000..29fc371
--- /dev/null
+++ b/contrib/svn-fe/remote-svn.c
@@ -0,0 +1,219 @@
+
+#include "cache.h"
+#include "remote.h"
+#include "strbuf.h"
+#include "url.h"
+#include "exec_cmd.h"
+#include "run-command.h"
+#include "svndump.h"
+#include "argv-array.h"
+
+static int debug;
+
+static inline void printd(const char *fmt, ...)
+{
+ if (debug) {
+ va_list vargs;
+ va_start(vargs, fmt);
+ fprintf(stderr, "rhsvn debug: ");
+ vfprintf(stderr, fmt, vargs);
+ fprintf(stderr, "\n");
+ va_end(vargs);
+ }
+}
+
+static const char *url;
+static const char *private_ref;
+static const char *remote_ref = "refs/heads/master";
+
+/*
+ * remote-helpers receive commands on their stdin. Command handler functions
+ * can return cmd_result, on fatal errors they die().
+ * NOT_HANDLED: the command was not handled by this function, name doesn't match.
+ * TERMINATE: Requests normal termination of the remote-helper.
+ */
+enum cmd_result { SUCCESS, NOT_HANDLED, TERMINATE };
+enum cmd_result cmd_capabilities(struct strbuf *line);
+enum cmd_result cmd_import(struct strbuf *line);
+enum cmd_result cmd_list(struct strbuf *line);
+enum cmd_result cmd_terminate(struct strbuf *line);
+
+typedef enum cmd_result (*input_command_handler)(struct strbuf *);
+
+const input_command_handler input_command_list[] = {
+ cmd_capabilities, cmd_import, cmd_list, cmd_terminate, NULL
+};
+
+enum cmd_result cmd_capabilities(struct strbuf *line)
+{
+ if (strcmp(line->buf, "capabilities"))
+ return NOT_HANDLED;
+
+ printf("import\n");
+ printf("refspec %s:%s\n\n", remote_ref, private_ref);
+ fflush(stdout);
+ return SUCCESS;
+}
+
+enum cmd_result cmd_import(struct strbuf *line)
+{
+ static int batch_active;
+ int code, report_fd;
+ char *back_pipe_env;
+ int dumpin_fd;
+ unsigned int startrev = 0;
+ struct argv_array svndump_argv = ARGV_ARRAY_INIT;
+ struct child_process svndump_proc;
+
+ /* terminate a current batch's fast-import stream */
+ if (line->len == 0 && batch_active) {
+ printf("done\n");
+ fflush(stdout);
+ batch_active = 0;
+ printd("import-batch finished.");
+ /*
+ * should the remote helper terminate after a batch?
+ * It seems that it should.
+ */
+ return TERMINATE;
+ }
+ if (prefixcmp(line->buf, "import"))
+ return NOT_HANDLED;
+
+ /* import commands can be grouped together in a batch. Batches are ended by \n */
+ batch_active = 1;
+
+ /*
+ * When the remote-helper is invoked by transport-helper.c it passes the
+ * filename of this pipe in the env-var.
+ */
+ back_pipe_env = getenv("GIT_REPORT_FIFO");
+ if (!back_pipe_env) {
+ die("Cannot get cat-blob-pipe from environment! GIT_REPORT_FIFO has to"
+ "be set by the caller.");
+ }
+
+ /*
+ * Opening a fifo for reading usually blocks until a writer has opened it too.
+ * Opening a fifo for writing usually blocks until a reader has opened it too.
+ * Therefore, we open with RDWR on both sides to avoid deadlocks.
+ * Especially if there's nothing to do and one pipe end is closed immediately.
+ */
+ report_fd = open(back_pipe_env, O_RDWR);
+ if (report_fd < 0) {
+ die("Unable to open fast-import back-pipe! %s", strerror(errno));
+ }
+ printd("Opened fast-import back-pipe %s for reading.", back_pipe_env);
+
+ 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, report_fd);
+ svndump_read(url, private_ref);
+ svndump_deinit();
+ svndump_reset();
+
+ close(dumpin_fd);
+ close(report_fd);
+ code = finish_command(&svndump_proc);
+ if (code)
+ warning("%s, returned %d", svndump_proc.argv[0], code);
+ argv_array_clear(&svndump_argv);
+
+ return SUCCESS;
+}
+
+enum cmd_result cmd_list(struct strbuf *line)
+{
+ if (strcmp(line->buf, "list"))
+ return NOT_HANDLED;
+
+ printf("? HEAD\n");
+ printf("? %s\n\n", remote_ref);
+ fflush(stdout);
+ return SUCCESS;
+}
+
+enum cmd_result cmd_terminate(struct strbuf *line)
+{
+ /* an empty line terminates the program, if not in a batch sequence */
+ if (line->len == 0)
+ return TERMINATE;
+ else
+ return NOT_HANDLED;
+}
+enum cmd_result do_command(struct strbuf *line)
+{
+ const input_command_handler *p = input_command_list;
+ enum cmd_result ret;
+ printd("command line '%s'", line->buf);
+ while(*p) {
+ ret = (*p)(line);
+ if (ret != NOT_HANDLED)
+ return ret;
+ p++;
+ }
+ warning("Unknown command '%s'\n", line->buf);
+ return ret;
+}
+
+int main(int argc, const char **argv)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int nongit;
+ static struct remote *remote;
+
+ if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
+ debug = 1;
+
+ git_extract_argv0_path(argv[0]);
+ setup_git_directory_gently(&nongit);
+ if (argc < 2) {
+ usage("git-remote-svn <remote-name> [<url>]");
+ return 1;
+ }
+
+ remote = remote_get(argv[1]);
+ if (argc == 3)
+ url = argv[2];
+ else if (argc == 2)
+ url = remote->url[0];
+ else
+ warning("Excess arguments!");
+
+ end_url_with_slash(&buf, url);
+ url = strbuf_detach(&buf, NULL);
+
+ printd("remote-svn starting with url %s", url);
+
+ strbuf_init(&buf, 0);
+ strbuf_addf(&buf, "refs/svn/%s/master", remote->name);
+ private_ref = strbuf_detach(&buf, NULL);
+
+ while(1) {
+ if (strbuf_getline(&buf, stdin, '\n') == EOF) {
+ if (ferror(stdin))
+ die_errno("Error reading command stream");
+ else
+ die_errno("Unexpected end of command stream");
+ }
+ if (do_command(&buf) == TERMINATE)
+ break;
+ strbuf_reset(&buf);
+ }
+
+ strbuf_release(&buf);
+ free((void*)url);
+ free((void*)private_ref);
+ return 0;
+}
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html