[Bug 1906881] [NEW] mdadm --export --detail format incorrect

[Chad Yates]

Public bug reported:

The mdadm --export --detail command creates environment variable
name/value pairs suitable to import into a scripts environment.  The
format of these has changed, and the change looks to be a bug.

Previously (prior to mdadm V4.1) the command would output in the following format:
MD_LEVEL=raid1
MD_DEVICES=2
MD_METADATA=1.2
MD_UUID=<redacted>
MD_NAME=<redacted>
MD_DEVICE_sdb_ROLE=0
MD_DEVICE_sdb_DEV=/dev/sdb

Now (mdadm V4.1) the command outputs in the following format:
MD_LEVEL=raid1
MD_DEVICES=2
MD_METADATA=1.2
MD_UUID=<redacted>
MD_NAME=<redacted>
MD_DEVICE_ev_sdb_ROLE=0
MD_DEVICE_ev_sdb_DEV=/dev/sdb

Note the differences in the the MD_DEVICE_<dev>_ROLE and
MD_DEVICE_<dev>_DEV variables where an extra "ev" string has been
included.

The "ev" string is added for all ROLE/DEV variables when multiple disks
are included in the RAID.

As this form of the --detail command is made as a consistent API
mechanism for scripts to use, it is important that it maintain correct
and consistent behavior.

I am using Ubuntu (20.04.1 LTS) along with mdadm (4.1-5ubuntu1.2).

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1906881

Title:
  mdadm --export --detail format incorrect

Status in mdadm package in Ubuntu:
  New

Bug description:
  The mdadm --export --detail command creates environment variable
  name/value pairs suitable to import into a scripts environment.  The
  format of these has changed, and the change looks to be a bug.

  Previously (prior to mdadm V4.1) the command would output in the following format:
  MD_LEVEL=raid1
  MD_DEVICES=2
  MD_METADATA=1.2
  MD_UUID=<redacted>
  MD_NAME=<redacted>
  MD_DEVICE_sdb_ROLE=0
  MD_DEVICE_sdb_DEV=/dev/sdb

  Now (mdadm V4.1) the command outputs in the following format:
  MD_LEVEL=raid1
  MD_DEVICES=2
  MD_METADATA=1.2
  MD_UUID=<redacted>
  MD_NAME=<redacted>
  MD_DEVICE_ev_sdb_ROLE=0
  MD_DEVICE_ev_sdb_DEV=/dev/sdb

  Note the differences in the the MD_DEVICE_<dev>_ROLE and
  MD_DEVICE_<dev>_DEV variables where an extra "ev" string has been
  included.

  The "ev" string is added for all ROLE/DEV variables when multiple
  disks are included in the RAID.

  As this form of the --detail command is made as a consistent API
  mechanism for scripts to use, it is important that it maintain correct
  and consistent behavior.

  I am using Ubuntu (20.04.1 LTS) along with mdadm (4.1-5ubuntu1.2).

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