Start of "git-send-pack", the local part of sending off a pack

Like git-receive-pack, this is only partway done.

diff --git a/Makefile b/Makefile
index c21a1a0..792b014 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ PROG=   git-update-cache git-diff-files git-init-db git-write-tree \
        git-get-tar-commit-id git-apply git-stripspace \
        git-cvs2git git-diff-stages git-rev-parse git-patch-id \
        git-pack-objects git-unpack-objects git-verify-pack \
-       git-receive-pack
+       git-receive-pack git-send-pack
 
 all: $(PROG)
 
@@ -127,6 +127,7 @@ git-pack-objects: pack-objects.c
 git-unpack-objects: unpack-objects.c
 git-verify-pack: verify-pack.c
 git-receive-pack: receive-pack.c
+git-send-pack: send-pack.c
 
 git-http-pull: LIBS += -lcurl
 git-rev-list: LIBS += -lssl

diff --git a/send-pack.c b/send-pack.c
new file mode 100644 (file)
index 0000000..af57d40
--- /dev/null
+++ b/send-pack.c
@@ -0,0 +1,118 @@
+#include "cache.h"
+
+static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
+
+static const char *exec = "git-receive-pack";
+
+static int send_pack(int in, int out)
+{
+       for (;;) {
+               static char buffer[1000];
+               int ret = read(in, buffer, sizeof(buffer));
+               if (ret > 0) {
+                       write(1, buffer, ret);
+                       continue;
+               }
+               break;
+       }
+       close(out);
+       return 0;
+}
+
+/*
+ * First, make it shell-safe.  We do this by just disallowing any
+ * special characters. Somebody who cares can do escaping and let
+ * through the rest. But since we're doing to feed this to ssh as
+ * a command line, we're going to be pretty damn anal for now.
+ */
+static char *shell_safe(char *url)
+{
+       char *n = url;
+       unsigned char c;
+       static const char flags[256] = {
+               ['0'...'9'] = 1,
+               ['a'...'z'] = 1,
+               ['A'...'Z'] = 1,
+               ['.'] = 1, ['/'] = 1,
+               ['-'] = 1, ['+'] = 1,
+               [':'] = 1
+       };
+
+       while ((c = *n++) != 0) {
+               if (flags[c] != 1)
+                       die("I don't like '%c'. Sue me.", c);
+       }
+       return url;
+}
+
+/*
+ * Yeah, yeah, fixme. Need to pass in the heads etc.
+ */
+static int setup_connection(int fd[2], char *url, char **heads)
+{
+       char command[1024];
+       const char *host, *path;
+       char *colon;
+       int pipefd[2][2];
+
+       url = shell_safe(url);
+       host = NULL;
+       path = url;
+       colon = strchr(url, ':');
+       if (colon) {
+               *colon = 0;
+               host = url;
+               path = colon+1;
+       }
+       snprintf(command, sizeof(command), "%s %s", exec, path);
+       if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
+               die("unable to create pipe pair for communication");
+       if (!fork()) {
+               dup2(pipefd[1][0], 0);
+               dup2(pipefd[0][1], 1);
+               close(pipefd[0][0]);
+               close(pipefd[0][1]);
+               close(pipefd[1][0]);
+               close(pipefd[1][1]);
+               if (host)
+                       execlp("ssh", "ssh", host, command, NULL);
+               else
+                       execlp(host, command, NULL);
+               die("exec failed");
+       }               
+       fd[0] = pipefd[0][0];
+       fd[1] = pipefd[1][1];
+       close(pipefd[0][1]);
+       close(pipefd[1][0]);
+       return 0;
+}
+
+int main(int argc, char **argv)
+{
+       int i, nr_heads = 0;
+       char *dest = NULL;
+       char **heads = NULL;
+       int fd[2];
+
+       argv++;
+       for (i = 1; i < argc; i++) {
+               char *arg = *argv++;
+
+               if (*arg == '-') {
+                       if (!strncmp(arg, "--exec=", 7)) {
+                               exec = arg + 7;
+                               continue;
+                       }
+                       usage(send_pack_usage);
+               }
+               dest = arg;
+               heads = argv;
+               nr_heads = argc - i -1;
+               break;
+       }
+       if (!dest)
+               usage(send_pack_usage);
+       if (setup_connection(fd, dest, heads))
+               return 1;
+       return send_pack(fd[0], fd[1]);
+}