X-Git-Url: https://git.octo.it/?p=git.git;a=blobdiff_plain;f=rsh.c;h=07166addd9629675c4b0c7c065564a283014b69d;hp=5615c74e7d5f4e5f9d93c0f90c6f57fe8b41442f;hb=HEAD;hpb=479346adc5ebb099121063d4c06da30093ed9b3b

diff --git a/rsh.c b/rsh.c
index 5615c74e..07166add 100644
--- a/rsh.c
+++ b/rsh.c
@@ -1,13 +1,42 @@
-#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
 
+/*
+ * 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)
 {
@@ -16,7 +45,10 @@ int setup_connection(int *fd_in, int *fd_out, const 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;
@@ -37,28 +69,45 @@ int setup_connection(int *fd_in, int *fd_out, const char *remote_prog,
 	if (!path) {
 		return error("Bad URL: %s", url);
 	}
-	/* ssh <host> 'cd <path>; stdio-pull <arg...> <commit-id>' */
-	snprintf(command, COMMAND_SIZE, 
-		 "%s='%s' %s",
-		 GIT_DIR_ENVIRONMENT, path, 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];