use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/env.c b/libblkid/env.c
new file mode 100644
index 0000000..c79e0e0
--- /dev/null
+++ b/libblkid/env.c
@@ -0,0 +1,110 @@
+/*
+ * Security checks of environment
+ * Added from shadow-utils package
+ * by Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#else
+#define PR_GET_DUMPABLE 3
+#endif
+#if (!defined(HAVE_PRCTL) && defined(linux))
+#include <sys/syscall.h>
+#endif
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "env.h"
+
+#ifndef HAVE_ENVIRON_DECL
+extern char **environ;
+#endif
+
+static char * const forbid[] = {
+ "_RLD_=",
+ "BASH_ENV=", /* GNU creeping featurism strikes again... */
+ "ENV=",
+ "HOME=",
+ "IFS=",
+ "KRB_CONF=",
+ "LD_", /* anything with the LD_ prefix */
+ "LIBPATH=",
+ "MAIL=",
+ "NLSPATH=",
+ "PATH=",
+ "SHELL=",
+ "SHLIB_PATH=",
+ (char *) 0
+};
+
+/* these are allowed, but with no slashes inside
+ (to work around security problems in GNU gettext) */
+static char * const noslash[] = {
+ "LANG=",
+ "LANGUAGE=",
+ "LC_", /* anything with the LC_ prefix */
+ (char *) 0
+};
+
+void
+sanitize_env(void)
+{
+ char **envp = environ;
+ char * const *bad;
+ char **cur;
+ char **move;
+
+ for (cur = envp; *cur; cur++) {
+ for (bad = forbid; *bad; bad++) {
+ if (strncmp(*cur, *bad, strlen(*bad)) == 0) {
+ for (move = cur; *move; move++)
+ *move = *(move + 1);
+ cur--;
+ break;
+ }
+ }
+ }
+
+ for (cur = envp; *cur; cur++) {
+ for (bad = noslash; *bad; bad++) {
+ if (strncmp(*cur, *bad, strlen(*bad)) != 0)
+ continue;
+ if (!strchr(*cur, '/'))
+ continue; /* OK */
+ for (move = cur; *move; move++)
+ *move = *(move + 1);
+ cur--;
+ break;
+ }
+ }
+}
+
+
+char *safe_getenv(const char *arg)
+{
+ uid_t ruid = getuid();
+
+ if (ruid != 0 || (ruid != geteuid()) || (getgid() != getegid()))
+ return NULL;
+#ifdef HAVE_PRCTL
+ if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
+ return NULL;
+#else
+#if (defined(linux) && defined(SYS_prctl))
+ if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
+ return NULL;
+#endif
+#endif
+#ifdef HAVE_SECURE_GETENV
+return secure_getenv(arg);
+#elif HAVE___SECURE_GETENV
+ return __secure_getenv(arg);
+#else
+ return getenv(arg);
+#endif
+}