[tests/selinux] pr775-checkpolicy-revdeps: kernel/selinux-testsuite: fix existence check in boolSet

[Ondrej Mosnacek <omosnace@redhat.com>]

            A new commit has been pushed.

            Repo   : tests/selinux
            Branch : pr775-checkpolicy-revdeps
            Commit : a5ae35d6afba6ba87191efc9d587463d1890d76f
            Author : Ondrej Mosnacek <omosnace@redhat.com>
            Date   : 2020-07-15T10:50:18+02:00
            Stats  : +1/-1 in 1 file(s)
            URL    : https://src.fedoraproject.org/tests/selinux/c/a5ae35d6afba6ba87191efc9d587463d1890d76f?branch=pr775-checkpolicy-revdeps

            Log:
            kernel/selinux-testsuite: fix existence check in boolSet

When the boolean name passed to boolSet is an alias, then the current
implementation would always skip setting the boolean. That in turn
causes allow_domain_fd_use to remain unset when it is an alias and the
testsuite fails (because it then doesn't reset the value due to `make`
logic). That can cause AVCs in later tests and so needs to be fixed.

The fix is to just try `getsebool <name>` instead of grepping `getsebool
-a` for the boolean name.

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>

---
diff --git a/kernel/selinux-testsuite/runtest.sh b/kernel/selinux-testsuite/runtest.sh
index 4b6aec7..a3bc970 100755
--- a/kernel/selinux-testsuite/runtest.sh
+++ b/kernel/selinux-testsuite/runtest.sh
@@ -114,7 +114,7 @@ function boolGet() {
     getsebool "$1" | cut -d ' ' -f 3
 }
 function boolSet() {
-    getsebool -a | cut -d ' ' -f 1 | grep "^$1\$" || return 0
+    getsebool "$1" &>/dev/null || return 0
     setsebool "$1" "$2" || return 1
     [ "$(boolGet "$1")" == "$2" ]
 }