Public bug reported:
As per https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=787950,
/usr/share/mdadm/checkarray fails when it tries to read
/sys/block/mdX/md/sync_action, if running under dash (or apparently most
shells other than bash), with a 4.x kernel.
Present in Ubuntu 15.10, where a default install does use /bin/sh ->
dash, and runs Linux 4.2.
A simple workaround is to make it a #!/bin/bash script. Another
alternative would be to read sync_action with cat, instead of the read
built-in, since (as a reply on the Debian bug report says), the problem
is char-at-a-time reading of the file in /sys.
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1550823
Title:
checkarray doesn't work with sh = dash
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