[Bug 1550823] Re: checkarray doesn't work with sh = dash

[Rodman]

Shouldn't this be changed upstream in the Debian package?  Checkarray is
not part of the mdadm program whatsoever.  It appears it was added into
the Debian package several years ago by an outside source.

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https://bugs.launchpad.net/bugs/1550823

Title:
  checkarray doesn't work with sh = dash

Status in mdadm package in Ubuntu:
  Triaged
Status in mdadm source package in Xenial:
  Triaged
Status in mdadm package in Debian:
  New

Bug description:
  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.

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