Benjamin Block 2dbaf9f991 chreipl-fcp-mpath: test if the system uses s390x IPL and re-IPL is from FCP ...

Add second filter stage to the udev rules: only continue with the
toolset, if the system uses s390x IPL and if the current re-IPL target
is from FCP.

For the test, whether the next re-IPL target is planned to be done from
FCP, a helper `chreipl-fcp-mpath-is-reipl-zfcp` is added, and the
information in /sys/firmware/reipl/reipl_type is used.

If either one or both of the tests are not true, the udev rules will
exit.

For debugging, the toolset can be built with the Make variable `D` set
to 1 (e.g.: make D=1; make install D=1). This causes the toolset to
write shell traces of the helper to $(DEBUGOUTDIR) (per default:
/run/udev); otherwise no output is generated. `dbginfo.sh` will be
changed to collect this data automatically.

Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2021-11-10 15:12:10 +01:00

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