From 17e6ba68d6d41f30cce566fe96033e4683f2f164 Mon Sep 17 00:00:00 2001
From: J. Ali Harlow <ali@juiblex.co.uk>
Date: Thu, 8 Jan 2009 14:35:18 +0000
Subject: [PATCH] Don't attempt to use chroot() on systems that don't support it.

This has the added bonus of allowing us to use popen() rather than
fork()/exec() for improved portability. Of course, the loss of an
install root is a major reduction of functionality but it's hard to
see what else we could substitute for chroot().
---
 configure.ac   |   12 +++++++++++-
 librazor/rpm.c |   24 ++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletions(-)

diff --git a/configure.ac b/configure.ac
index cb56d56..2fea7b2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,13 +24,23 @@ AM_PROG_CC_STDC
 AC_HEADER_STDC
 AC_CHECK_HEADERS([sys/mman.h])
 gl_INIT
-AC_CHECK_FUNCS([symlink])
+AC_CHECK_FUNCS([symlink chroot])
 AM_PROG_LIBTOOL
 AC_PROG_MAKE_SET
 AC_PROG_LN_S
 AC_SYS_LARGEFILE
 AM_PROG_CC_C_O
 
+AC_MSG_CHECKING([for Microsoft Windows native API])
+case $host_os in
+    *mingw*)	AC_DEFINE([MSWIN_API], 1,
+		  [Define to 1 to use Microsoft Windows native API.])
+		mswin_api=yes;;
+    *)		mswin_api=no;;
+esac
+AC_MSG_RESULT([$mswin_api])
+AM_CONDITIONAL(MSWIN_API, test "$mswin_api" = "yes")
+
 # Taken from dbus
 AC_ARG_ENABLE(ansi,             [  --enable-ansi           enable -ansi -pedantic gcc flags],enable_ansi=$enableval,enable_ansi=no)
 AC_ARG_ENABLE(verbose-mode,     [  --enable-verbose-mode   support verbose debug mode],enable_verbose_mode=$enableval,enable_verbose_mode=$USE_MAINTAINER_MODE)
diff --git a/librazor/rpm.c b/librazor/rpm.c
index c4eafb9..f271e7a 100644
--- a/librazor/rpm.c
+++ b/librazor/rpm.c
@@ -567,7 +567,11 @@ static int
 run_script(struct installer *installer,
 	   unsigned int program_tag, unsigned int script_tag)
 {
+#if HAVE_CHROOT
 	int pid, status, fd[2];
+#else
+	FILE *fp;
+#endif
 	const char *script = NULL, *program = NULL;
 
 	program = razor_rpm_get_indirect(installer->rpm, program_tag, NULL);
@@ -575,9 +579,21 @@ run_script(struct installer *installer,
 	if (program == NULL && script == NULL) {
 		return 0;
 	} else if (program == NULL) {
+#if MSWIN_API
+		program = getenv("COMSPEC");
+		if (program) {
+			program = strchr(program, '=');
+			if (program)
+				program++;
+		}
+		if (!program)
+			program = "c:\\windows\\system32\\cmd.exe";
+#else
 		program = "/bin/sh";
+#endif
 	}
 
+#if HAVE_CHROOT
 	if (pipe(fd) < 0) {
 		fprintf(stderr, "failed to create pipe\n");
 		return -1;
@@ -621,6 +637,14 @@ run_script(struct installer *installer,
 		if (status)
 			printf("script exited with status %d\n", status);
 	}
+#else
+	fp = popen(program, "w");
+	if (fwrite(script, strlen(script), 1, fp) != 1) {
+		fprintf(stderr, "failed to pipe script, %m\n");
+		return -1;
+	}
+	pclose(fp);
+#endif
 
 	return 0;
 }
-- 
1.7.1