[Bug 1878721] [NEW] memcached looks for SASL configuration at wrong path /etc/sasl2/memcached.conf/memcached.conf (18.04→20.04 regression)

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You have been subscribed to a public bug by Rafael David Tinoco (rafaeldtinoco):

[Impact]

memcached 1.5.22 in focal has a bug where it looks for its SASL
configuration at /etc/sasl2/memcached.conf/memcached.conf instead of
/etc/sasl2/memcached.conf.  This causes a memcached setup with
authentication that was working in bionic to fail in focal.

The bug was introduced upstream in 1.5.7~3:
https://github.com/memcached/memcached/commit/39151c870c5e598f039714bdb790bd46f614856e
https://github.com/memcached/memcached/pull/366
and fixed upstream in 1.6.0~15:
https://github.com/memcached/memcached/commit/6207330c2705fdb5f02de13b99a0d994f7c4f14a

[Test Case]

apt-get install memcached libmemcached-tools libsasl2-modules sasl2-bin
mkdir /etc/sasl2
echo 'mech_list: plain' > /etc/sasl2/memcached.conf
echo 'sasldb_path: /etc/sasl2/memcached-sasldb2' >> /etc/sasl2/memcached.conf
echo bar | saslpasswd2 -p -f /etc/sasl2/memcached-sasldb2 -a memcached foo
chown memcache: /etc/sasl2/memcached-sasldb2
systemctl restart memcached
memcping --servers=127.0.0.1 --binary --username=foo --password=bar

Works in bionic; fails in focal with “Failed to ping 127.0.0.1:11211
WRITE FAILURE”.

[Regression Potential]

Low risk.  The upstream patch is targeted and applies cleanly to 1.5.22.
It looks for the SASL configuration at both locations, so if someone
worked around this bug by creating
/etc/sasl2/memcached.conf/memcached.conf, that will continue to be
respected.

** Affects: memcached (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: memcached (Ubuntu Eoan)
     Importance: Undecided
         Status: Triaged

** Affects: memcached (Ubuntu Focal)
     Importance: High
         Status: Confirmed


** Tags: block-proposed-eoan block-proposed-focal block-proposed-groovy focal patch patch-accepted-upstream regression-release server-next
-- 
memcached looks for SASL configuration at wrong path /etc/sasl2/memcached.conf/memcached.conf (18.04→20.04 regression)
https://bugs.launchpad.net/bugs/1878721
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