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mirror_zfs/cmd/zed/zed.d
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Tony Hutter 8720e9e748 Add -c to zpool iostat & status to run command 
This patch adds a command (-c) option to zpool status and zpool iostat.  The
-c option allows you to run an arbitrary command on each vdev and display
the first line of output in zpool status/iostat.  The environment vars
VDEV_PATH and VDEV_UPATH are set to the vdev's path and "underlying path"
before running the command.  For device mapper, multipath, or partitioned
vdevs, VDEV_UPATH is the actual underlying /dev/sd* disk.  This can be useful
if the command you're running requires a /dev/sd* device.

The patch also uses /sys/block/<dev>/slaves/ to lookup the underlying device
instead of using libdevmapper.  This not only removes the libdevmapper
requirement at build time, but also allows you to resolve device mapper
devices without being root.  This means that UDEV_UPATH get set correctly
when running zpool status/iostat as an unprivileged user.

Example:

$ zpool status -c 'echo I am $VDEV_PATH, $VDEV_UPATH'

NAME        STATE     READ WRITE CKSUM
mypool      ONLINE       0     0     0
  mirror-0  ONLINE       0     0     0
    mpatha  ONLINE       0     0     0  I am /dev/mapper/mpatha, /dev/sdc
    sdb     ONLINE       0     0     0  I am /dev/sdb1, /dev/sdb

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #5368
2016-11-29 14:45:38 -07:00
..
all-debug.sh Cleanup ZEDLETs 2015-04-27 12:08:01 -07:00
all-syslog.sh Bring over illumos ZFS FMA logic -- phase 1 2016-09-01 11:39:45 -07:00
data-notify.sh Add a statechange notify zedlet 2016-11-10 13:52:59 -08:00
generic-notify.sh Replace "email" ZEDLETs with "notify" ZEDLETs 2015-04-27 12:08:07 -07:00
README Cleanup ZEDLETs 2015-04-27 12:08:01 -07:00
resilver_finish-notify.sh OpenZFS 5997 - FRU field not set during pool creation and never updated 2016-08-12 13:06:48 -07:00
scrub_finish-notify.sh OpenZFS 5997 - FRU field not set during pool creation and never updated 2016-08-12 13:06:48 -07:00
statechange-led.sh Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
statechange-notify.sh Add a statechange notify zedlet 2016-11-10 13:52:59 -08:00
vdev_attach-led.sh Fix statechange-led.sh & unnecessary libdevmapper warning 2016-10-25 11:05:30 -07:00
vdev_clear-led.sh Multipath autoreplace, control enclosure LEDs, event rate limiting 2016-10-19 12:55:59 -07:00
zed-functions.sh Rework zed_notify_email for configurable PROG/OPTS 2015-07-30 11:52:56 -07:00
zed.rc Add a statechange notify zedlet 2016-11-10 13:52:59 -08:00

README 

Shell scripts are the recommended choice for ZEDLETs that mostly call
other utilities and do relatively little data manipulation.

Shell scripts MUST work on both bash and dash.

Shell scripts MUST run cleanly through ShellCheck:
  http://www.shellcheck.net/

General functions reside in "zed-functions.sh".  Use them where applicable.

Additional references that may be of use:

  Google Shell Style Guide
  https://google-styleguide.googlecode.com/svn/trunk/shell.xml

  Dash as /bin/sh
  https://wiki.ubuntu.com/DashAsBinSh

  Common shell script mistakes
  http://www.pixelbeat.org/programming/shell_script_mistakes.html

  Filenames and Pathnames in Shell: How to do it Correctly
  http://www.dwheeler.com/essays/filenames-in-shell.html

  Autoconf: Portable Shell Programming
  https://www.gnu.org/software/autoconf/manual/autoconf.html#Portable-Shell

Please BE CONSISTENT with the existing style, check for errors,
minimize dependencies where possible, try to be portable,
and comment anything non-obvious.  Festina lente.