GIT_TRACE: show which built-in/external commands are executed

diff --git a/rsh.c b/rsh.c
index 5d1cb9d578a8e679fc190a9d7d2c842ad811223f..07166addd9629675c4b0c7c065564a283014b69d 100644 (file)
--- a/rsh.c
+++ b/rsh.c
@@ -1,14 +1,43 @@
-#include "rsh.h"
-
 #include <string.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 
+#include "rsh.h"
+#include "quote.h"
 #include "cache.h"
 
 #define COMMAND_SIZE 4096
 
-int setup_connection(int *fd_in, int *fd_out, char *remote_prog, 
+/*
+ * Append a string to a string buffer, with or without shell quoting.
+ * Return true if the buffer overflowed.
+ */
+static int add_to_string(char **ptrp, int *sizep, const char *str, int quote)
+{
+       char *p = *ptrp;
+       int size = *sizep;
+       int oc;
+       int err = 0;
+
+       if ( quote ) {
+               oc = sq_quote_buf(p, size, str);
+       } else {
+               oc = strlen(str);
+               memcpy(p, str, (oc >= size) ? size-1 : oc);
+       }
+
+       if ( oc >= size ) {
+               err = 1;
+               oc = size-1;
+       }
+
+       *ptrp  += oc;
+       **ptrp  = '\0';
+       *sizep -= oc;
+       return err;
+}
+
+int setup_connection(int *fd_in, int *fd_out, const char *remote_prog, 
                     char *url, int rmt_argc, char **rmt_argv)
 {
        char *host;
@@ -16,7 +45,10 @@ int setup_connection(int *fd_in, int *fd_out, char *remote_prog,
        int sv[2];
        char command[COMMAND_SIZE];
        char *posn;
+       int sizen;
+       int of;
        int i;
+       pid_t pid;
 
        if (!strcmp(url, "-")) {
                *fd_in = 0;
@@ -25,37 +57,57 @@ int setup_connection(int *fd_in, int *fd_out, char *remote_prog,
        }
 
        host = strstr(url, "//");
-       if (!host) {
-               return error("Bad URL: %s", url);
+       if (host) {
+               host += 2;
+               path = strchr(host, '/');
+       } else {
+               host = url;
+               path = strchr(host, ':');
+               if (path)
+                       *(path++) = '\0';
        }
-       host += 2;
-       path = strchr(host, '/');
        if (!path) {
                return error("Bad URL: %s", url);
        }
-       *(path++) = '\0';
-       /* ssh <host> 'cd /<path>; stdio-pull <arg...> <commit-id>' */
-       snprintf(command, COMMAND_SIZE, 
-                "cd /%s; %s=objects %s",
-                path, DB_ENVIRONMENT, remote_prog);
-       posn = command + strlen(command);
-       for (i = 0; i < rmt_argc; i++) {
-               *(posn++) = ' ';
-               strncpy(posn, rmt_argv[i], COMMAND_SIZE - (posn - command));
-               posn += strlen(rmt_argv[i]);
-               if (posn - command + 4 >= COMMAND_SIZE) {
-                       return error("Command line too long");
-               }
+       /* $GIT_RSH <host> "env GIT_DIR=<path> <remote_prog> <args...>" */
+       sizen = COMMAND_SIZE;
+       posn = command;
+       of = 0;
+       of |= add_to_string(&posn, &sizen, "env ", 0);
+       of |= add_to_string(&posn, &sizen, GIT_DIR_ENVIRONMENT "=", 0);
+       of |= add_to_string(&posn, &sizen, path, 1);
+       of |= add_to_string(&posn, &sizen, " ", 0);
+       of |= add_to_string(&posn, &sizen, remote_prog, 1);
+
+       for ( i = 0 ; i < rmt_argc ; i++ ) {
+               of |= add_to_string(&posn, &sizen, " ", 0);
+               of |= add_to_string(&posn, &sizen, rmt_argv[i], 1);
        }
-       strcpy(posn, " -");
-       if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv)) {
+
+       of |= add_to_string(&posn, &sizen, " -", 0);
+
+       if ( of )
+               return error("Command line too long");
+
+       if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
                return error("Couldn't create socket");
-       }
-       if (!fork()) {
+
+       pid = fork();
+       if (pid < 0)
+               return error("Couldn't fork");
+       if (!pid) {
+               const char *ssh, *ssh_basename;
+               ssh = getenv("GIT_SSH");
+               if (!ssh) ssh = "ssh";
+               ssh_basename = strrchr(ssh, '/');
+               if (!ssh_basename)
+                       ssh_basename = ssh;
+               else
+                       ssh_basename++;
                close(sv[1]);
                dup2(sv[0], 0);
                dup2(sv[0], 1);
-               execlp("ssh", "ssh", host, command, NULL);
+               execlp(ssh, ssh_basename, host, command, NULL);
        }
        close(sv[0]);
        *fd_in = sv[1];