Add support for libsubid

This will enable remote access to /etc/subuid and /etc/subgid
information from ldap services, if shadow-utils ships with a libsubid.

[NO TESTS NEEDED] Since we have no way to test this.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/hack/libsubid_tag.sh b/hack/libsubid_tag.sh
new file mode 100755
index 000000000..ab6af9e30
--- /dev/null
+++ b/hack/libsubid_tag.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+if test $(${GO:-go} env GOOS) != "linux" ; then
+	exit 0
+fi
+tmpdir="$PWD/tmp.$RANDOM"
+mkdir -p "$tmpdir"
+trap 'rm -fr "$tmpdir"' EXIT
+cc -o "$tmpdir"/libsubid_tag -l subid -x c - > /dev/null 2> /dev/null << EOF
+#include <shadow/subid.h>
+int main() {
+	struct subid_range *ranges = NULL;
+	get_subuid_ranges("root", &ranges);
+	free(ranges);
+	return 0;
+}
+EOF
+if test $? -eq 0 ; then
+	echo libsubid
+fi