net-fs/nfs-utils: warn if client tracking will be broken

NFSDv4 supports client tracking across server restarts using two
methods. The legacy method is in-kernel and requires CONFIG_CRYPTO_MD5,
which is not automatically selected by CONFIG_NFSD_V4 (see
https://bugzilla.kernel.org/show_bug.cgi?id=52271). The newer method
involves a usermode helper upcall program (nfsdcltrack), which is built
and installed only when USE="nfsdcld". If neither method is available,
then the NFS server does not support tracking clients across restarts,
and it emits a warning to the kernel log:

NFSD: unable to generate recoverydir name (-2).
NFSD: disabling legacy clientid tracking. Reboot recovery will not function correctly!

This commit introduces an ewarn in pkg_setup to warn the user if their
configuration will not support client tracking due to neither of these
options being enabled.

Closes: https://github.com/gentoo/gentoo/pull/1448
Closes: https://bugs.gentoo.org/582714
Signed-off-by: Matt Turner <mattst88@gentoo.org>

diff --git a/net-fs/nfs-utils/nfs-utils-2.4.1.ebuild b/net-fs/nfs-utils/nfs-utils-2.4.1.ebuild
index c579954763ad2dd7052de1502e5e126abec2d7f2..aff15752fd00b38db03ce0e8b157ee4b3260d5df 100644 (file)
--- a/net-fs/nfs-utils/nfs-utils-2.4.1.ebuild
+++ b/net-fs/nfs-utils/nfs-utils-2.4.1.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=7
 
-inherit autotools flag-o-matic multilib systemd
+inherit autotools flag-o-matic linux-info multilib systemd
 
 DESCRIPTION="NFS client and server daemons"
 HOMEPAGE="http://linux-nfs.org/"
@@ -70,6 +70,16 @@ PATCHES=(
        "${FILESDIR}"/${P}-gssd-Look-in-lib32-for-gss-libs-aswell.patch
 )
 
+pkg_setup() {
+       linux-info_pkg_setup
+       if use nfsv4 && ! use nfsdcld && linux_config_exists && ! linux_chkconfig_present CRYPTO_MD5 ; then
+               ewarn "Your NFS server will be unable to track clients across server restarts!"
+               ewarn "Please enable the \"${HILITE}nfsdcld${NORMAL}\" USE flag to install the nfsdcltrack usermode"
+               ewarn "helper upcall program, or enable ${HILITE}CONFIG_CRYPTO_MD5${NORMAL} in your kernel to"
+               ewarn "support the legacy, in-kernel client tracker."
+       fi
+}
+
 src_prepare() {
        default