diff --git a/yocto-poky/meta/recipes-core/os-release/os-release.bb b/yocto-poky/meta/recipes-core/os-release/os-release.bb
index c690b82..f519add 100644
--- a/yocto-poky/meta/recipes-core/os-release/os-release.bb
+++ b/yocto-poky/meta/recipes-core/os-release/os-release.bb
@@ -23,28 +23,26 @@
 BUILD_ID ?= "${DATETIME}"
 BUILD_ID[vardepsexclude] = "DATETIME"
 
+def sanitise_version(ver):
+    # VERSION_ID should be (from os-release(5)):
+    #    lower-case string (mostly numeric, no spaces or other characters
+    #    outside of 0-9, a-z, ".", "_" and "-")
+    ret = ver.replace('+', '-').replace(' ','_')
+    return ret.lower()
+
 python do_compile () {
     import shutil
     with open(d.expand('${B}/os-release'), 'w') as f:
         for field in d.getVar('OS_RELEASE_FIELDS', True).split():
             value = d.getVar(field, True)
+            if value and field == 'VERSION_ID':
+                value = sanitise_version(value)
             if value:
-                f.write('{0}={1}\n'.format(field, value))
-    if d.getVar('RPM_SIGN_PACKAGES', True) == '1':
-        rpm_gpg_pubkey = d.getVar('RPM_GPG_PUBKEY', True)
-        bb.utils.mkdirhier('${B}/rpm-gpg')
-        distro_version = d.getVar('DISTRO_VERSION', True) or "oe.0"
-        shutil.copy2(rpm_gpg_pubkey, d.expand('${B}/rpm-gpg/RPM-GPG-KEY-%s' % distro_version))
+                f.write('{0}="{1}"\n'.format(field, value))
 }
 do_compile[vardeps] += "${OS_RELEASE_FIELDS}"
-do_compile[depends] += "signing-keys:do_export_public_keys"
 
 do_install () {
     install -d ${D}${sysconfdir}
     install -m 0644 os-release ${D}${sysconfdir}/
-
-    if [ -d "rpm-gpg" ]; then
-        install -d "${D}${sysconfdir}/pki"
-        cp -r "rpm-gpg" "${D}${sysconfdir}/pki/"
-    fi
 }