[fedora-arm] Fedora 27 Anaconda systemd fail, /dev/disk/ by-path enumeration name does not match CentOS/RHEL 7.3, 7.4, 7.5

[Ed Gasiorowski]

Description of problem: in RHEL 7.3, 7.4, and 7.5-SNAP1 using the following Beaker Kickstart Metadata

ignoredisk=--only-use=/dev/disk/by-path/platform-APMC0D33:01-ata-1.0 "clearpart=--initlabel --all" zerombr

On Fedora 27, anaconda fails with the following message:
http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon <http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon>
+ curl --retry 20 --remote-time -o /tmp/anamon http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon <http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon>
% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 100 8741 100 8741 0 0 8741 0 0:00:01 --:--:-- 0:00:01 2134k
+ python /tmp/anamon --recipe-id 28293 --xmlrpc-url http://beaker-controller.rack151.mustanglab.us.amcc:8000/RPC2 <http://beaker-controller.rack151.mustanglab.us.amcc:8000/RPC2> /tmp/ks-script-6olvntfg: line 38: python: command not found
An error occurred during reading the kickstart file: The following problem occurred on line 32 of the kickstart file:
Disk "/dev/disk/by-path/platform-APMC0D33:01-ata-1.0" given in ignoredisk command does not exist.
The installer will now terminate. Pane is dead

Issue: In RHEL 7.3/7.4/7.5 & CentOS 7.3/7.4, in /dev/disk/by-path/...
the path name "platform-APMC0D33:01-ata-1.0" has decimal extension i.e. "1.0"

In Fedora 27, in /dev/disk/by-path/...
the path name "platform-APMC0D33:01-ata-1" has no decimal extension i.e. "1"

When using disk specific targeting for OS install on systems with more than 1 installable device, this inconsistency causes issues with automation and common kickstart
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[Peter Robinson]

Post by Ed Gasiorowski
Description of problem: in RHEL 7.3, 7.4, and 7.5-SNAP1 using the following Beaker Kickstart Metadata
ignoredisk=--only-use=/dev/disk/by-path/platform-APMC0D33:01-ata-1.0 "clearpart=--initlabel --all" zerombr
http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon <http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon>
+ curl --retry 20 --remote-time -o /tmp/anamon http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon <http://beaker-controller.rack151.mustanglab.us.amcc/beaker/anamon>
% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 100 8741 100 8741 0 0 8741 0 0:00:01 --:--:-- 0:00:01 2134k
+ python /tmp/anamon --recipe-id 28293 --xmlrpc-url http://beaker-controller.rack151.mustanglab.us.amcc:8000/RPC2 <http://beaker-controller.rack151.mustanglab.us.amcc:8000/RPC2> /tmp/ks-script-6olvntfg: line 38: python: command not found
Disk "/dev/disk/by-path/platform-APMC0D33:01-ata-1.0" given in ignoredisk command does not exist.
The installer will now terminate. Pane is dead
Issue: In RHEL 7.3/7.4/7.5 & CentOS 7.3/7.4, in /dev/disk/by-path/...
the path name "platform-APMC0D33:01-ata-1.0" has decimal extension i.e. "1.0"
In Fedora 27, in /dev/disk/by-path/...
the path name "platform-APMC0D33:01-ata-1" has no decimal extension i.e. "1"
When using disk specific targeting for OS install on systems with more than 1 installable device, this inconsistency causes issues with automation and common kickstart

Looking at a booted mustang system I don't see those names but see the
following:
platform-1a400000.sata-ata-1
platform-1a400000.sata-ata-2

I don't see anything with platform-APM at all. So I suspect something
has changed in the upstream kernel, or more likely that RHEL is
pulling in non upstream patches. Do the RHEL systems have duplicate
names like the above, which would actually be more consistent across
systems that aren't APM anyway, that could be used. Ultimately Fedora
just uses upstream, if Red Hat pulls in various non upstream patch
sets that provide non standard naming there's not much we can do to
address that in Fedora.

Peter
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