[SMAGENT-981] calculate HASH of fedora atomic kernel config (#1172)

* calculate HASH of fedora atomic kernel config
* changed path to /lib/modules/.../config
* added comment on symlink assumption inside container

sysdig-probe-loader

@@ -21,6 +21,11 @@ get_kernel_config() {
 	elif [ ! -z "${SYSDIG_HOST_ROOT}" ] && [ -f "${SYSDIG_HOST_ROOT}/usr/lib/ostree-boot/config-${KERNEL_RELEASE}" ]; then
 		echo "Found kernel config at ${SYSDIG_HOST_ROOT}/usr/lib/ostree-boot/config-${KERNEL_RELEASE}"
 		HASH=$(md5sum "${SYSDIG_HOST_ROOT}/usr/lib/ostree-boot/config-${KERNEL_RELEASE}" | cut -d' ' -f1)
+	elif [ -f /lib/modules/${KERNEL_RELEASE}/config ]; then
+		# this code works both for native host and agent container assuming that
+		# Dockerfile sets up the desired symlink /lib/modules -> $SYSDIG_HOST_ROOT/lib/modules
+		echo "Found kernel config at /lib/modules/${KERNEL_RELEASE}/config"
+		HASH=$(md5sum "/lib/modules/${KERNEL_RELEASE}/config" | cut -d' ' -f1)
 	fi
 
 	if [ -z "${HASH}" ]; then