Merge pull request #3484 from rhatdan/subid

Add support for libsubid

Makefile

@@ -1,7 +1,7 @@
 export GOPROXY=https://proxy.golang.org
 
 APPARMORTAG := $(shell hack/apparmor_tag.sh)
-STORAGETAGS := $(shell ./btrfs_tag.sh) $(shell ./btrfs_installed_tag.sh) $(shell ./libdm_tag.sh)
+STORAGETAGS := $(shell ./btrfs_tag.sh) $(shell ./btrfs_installed_tag.sh) $(shell ./libdm_tag.sh) $(shell ./hack/libsubid_tag.sh)
 SECURITYTAGS ?= seccomp $(APPARMORTAG)
 TAGS ?= $(SECURITYTAGS) $(STORAGETAGS)
 BUILDTAGS += $(TAGS)

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