on the fly ZFS builds for CentOS don't work

[eschrock]

Could be that we're not running with sufficient privileges to read /etc/centos-release

Status: Downloaded newer image for titandata/zfs-builder:latest
++ dirname /build.sh
+ . //common.sh
+ '[' kernel '!=' user ']'
+ get_kernel_vars
+ '[' -z '' ']'
++ uname -r
+ KERNEL_RELEASE=3.10.0-1062.4.1.el7.x86_64
+ '[' -z '' ']'
++ uname -a
+ KERNEL_UNAME='Linux a50792a1bde1 3.10.0-1062.4.1.el7.x86_64 #1 SMP Fri Oct 18 17:15:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux'
+ KERNEL_VERSION=3.10.0
+ KERNEL_VARIANT=1062.4.1.el7.x86_64
++ get_kernel_type
++ case $KERNEL_VARIANT in
++ case $KERNEL_UNAME in
++ echo centos
+ kernel_type=centos
++ dirname /build.sh
+ . //centos.sh
+ build
+ local centos_release
+ [[ -f /config/centos-release ]]
++ nsenter -t 1 -m cat /etc/centos-release
nsenter: reassociate to namespace 'ns/mnt' failed: Operation not permitted
+ centos_release=
2019-11-12_18:05:14 TITAN ERROR ZFS build failed