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Full Discussion: Renaming directories stops resumption of write process
Top Forums Shell Programming and Scripting Renaming directories stops resumption of write process Post 302964451 by sea on Thursday 14th of January 2016 06:13:33 PM
Old 01-14-2016
Quote:
Originally Posted by skysmart
Now, the problem is. after this upgrade is done, the process in cron does not resuming writing to the /var/tmp/EXAMPLEA directory even though everything is set up as it was before, with the write permissions and all.
That means you have currently running something.

Quote:
Originally Posted by skysmart
can someone point in the direction of what the problem could be?
Not without knowing where,what and how it is done.

Quote:
Originally Posted by hicksd8
I guess it depends on whether the cron job has the files open when the update runs. If so, it will (internally) be writing to specific inode numbers rather than specific files. In stage 3 when you 'copy' the files back to the original directory you create new inodes for those files. I'd be inclined to try renaming the files using 'mv' in stage 3 rather than 'cp'
One could make sure none of those files are open at the time the script is working with them.
Like, creating a lock file or something.

Otherwise... Need code!
Last edited by sea; 01-14-2016 at 07:22 PM..
This User Gave Thanks to sea For This Post:
SkySmart
 

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LEARN ABOUT PLAN9

dh_systemd_start

DH_SYSTEMD_START(1)						     Debhelper						       DH_SYSTEMD_START(1)

NAME

       dh_systemd_start - start/stop/restart systemd unit files

SYNOPSIS

       dh_systemd_start [debhelperoptions] [--restart-after-upgrade] [--no-stop-on-upgrade] [unitfile...]

DESCRIPTION

       dh_systemd_start is a debhelper program that is responsible for starting/stopping or restarting systemd unit files in case no corresponding
       sysv init script is available.

       As with dh_installinit, the unit file is stopped before upgrades and started afterwards (unless --restart-after-upgrade is specified, in
       which case it will only be restarted after the upgrade).  This logic is not used when there is a corresponding SysV init script because
       invoke-rc.d performs the stop/start/restart in that case.

OPTIONS

       --restart-after-upgrade
	   Do not stop the unit file until after the package upgrade has been completed.  This is the default behaviour in compat 10.

	   In earlier compat levels the default was to stop the unit file in the prerm, and start it again in the postinst.

	   This can be useful for daemons that should not have a possibly long downtime during upgrade. But you should make sure that the daemon
	   will not get confused by the package being upgraded while it's running before using this option.

       --no-restart-after-upgrade
	   Undo a previous --restart-after-upgrade (or the default of compat 10).  If no other options are given, this will cause the service to
	   be stopped in the prerm script and started again in the postinst script.

       -r, --no-stop-on-upgrade, --no-restart-on-upgrade
	   Do not stop service on upgrade.

       --no-start
	   Do not start the unit file after upgrades and after initial installation (the latter is only relevant for services without a
	   corresponding init script).

NOTES

       Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command (with the same arguments).
       Otherwise, it may cause multiple instances of the same text to be added to maintainer scripts.

       Note that dh_systemd_start should be run after dh_installinit so that it can detect corresponding SysV init scripts. The default sequence
       in dh does the right thing, this note is only relevant when you are calling dh_systemd_start manually.

SEE ALSO

       debhelper(7)

AUTHORS

       pkg-systemd-maintainers@lists.alioth.debian.org

11.1.6ubuntu2							    2018-05-10						       DH_SYSTEMD_START(1)
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