[HTCondor-users] docker detection broken in centos 7

[Dimitri Maziuk <dmaziuk@xxxxxxxxxxxxx>]

Todd, Brian,

I found out that centos-provided docker rpms don't work with condor:
docker socket is not writable by a dedicated group. So I replaced them
with the upstream docker-ce.

Now on some hosts "hasdocker" is true and StarterLog contains

> 10/29/19 15:02:28 (pid:1354) DockerProc::Version() found version 'Docker version 19.03.4, build 9013bf583a'
> 10/29/19 15:02:28 (pid:1354) '/usr/bin/singularity --version' did not exit successfully (code 0); the first line of output was ''.

These are "CentOS Linux release 7.7.1908 (Core)" w/
docker-ce-19.03.4-3.el7.x86_64 and a mix of condor-8.8.5-1.el7.x86_64
and condor-8.6.13-1.el7.x86_64 (stil upgrading).

On some other hosts "hasdocker" is false and StarterLog contains

> 10/31/19 13:08:39 (pid:1798) '/usr/bin/docker info' did not exit successfully (code 256); the first line of output was 'WARNING: Error loading config file: /root/.docker/config.json: stat /root/.docker/config.json: permission denied'.
> 10/31/19 13:08:39 (pid:1798) '/usr/bin/singularity --version' did not exit successfully (code 32708); the first line of output was ''.

Those are all condor-8.8.5-1.el7.x86_64, centos and docker-ce versions
as above.

None of them have /root/.docker/config.json, the warning does not pop up
when I run `docker info` from command line (as either root or condor)
and its exit code is 0.

Any idea what's going wrong?

-- 
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu

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