Comment 23 for bug 1642966

Ok Thanks so much
I try to do it

Il 30/nov/2016 19:01, "Robie Basak" <email address hidden> ha scritto:

> I think this might be caused by an interesting interaction between
> systemd, debhelper and the CUPS scheduler.
>
> I can reproduce a very similar error with the following. I think (though
> am not sure) that this is related to the root cause. On a fresh Xenial
> system:
>
> sudo apt-get update && sudo apt-get -y install cups
> sudo -i
> systemctl stop cups.service
> sleep 4
> touch /var/cache/cups/org.cups.cupsd
> sleep 4
> sudo rm /var/cache/cups/org.cups.cupsd
> sleep 4
> systemctl stop cups.service
>
> (the sleeps are to avoid any unknown, additional and unintentional race
> conditions)
>
> This results in an exit status of 1 and the message "Job for
> cups.service canceled." which matches the error that reporters have been
> seeing.
>
> In other words, if cups.service is started via cups.path, that cause is
> removed, and then we request a manual stop of cups.service, then systemd
> refuses to stop the service the first time (a retry always succeeds for
> me).
>
> In cups-daemon.prerm, debhelper has added "deb-systemd-invoke stop
> cups.path" followed by "invoke-rc.d cups stop || exit $?". I believe the
> second invocation is ultimately equivalent to "systemctl stop
> cups.service" and fails the same way as in my example, causing the prerm
> to exit 1, causing the dpkg failure reported.
>
> I'm not sure of the intended logic for /lib/systemd/system/cups.path
> here. AFAICT, it exists because when using CUPS with launchd, the CUPS
> daemon leaves the file in place as long as it doesn't want to be
> terminated, and removes it when it wants to be terminated before it
> exits anyway. Is this because launchd kills daemons itself unless the
> keepalive file exists?
>
> With systemd, I can't find any documentation that suggests that systemd
> ever intends to automatically kill a socket activated daemon. AFAICT,
> it's entirely up to the daemon when it chooses to exit. So there appears
> to be no need for cupsd to maintain /var/cache/cups/org.cups.cupsd when
> running under systemd.
>
> As configured right now, systemd will also start cupsd if
> /var/cache/cups/org.cups.cupsd is created while cupsd is not running. I
> can't find anything that might use this function. So either this is an
> accidental side-effect that is not needed, or I have missed some other
> path that does need this.
>
> systemd talks about CUPS in a blog post that is relevant:
> http://0pointer.de/blog/projects/socket-activation2.html. Note that this
> only sets up a path unit for /var/spool/cups, not any kind of keepalive
> file for cupsd.
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1644526).
> https://bugs.launchpad.net/bugs/1642966
>
> Title:
> package cups-daemon 2.1.3-4 failed to install/upgrade: subprocess new
> pre-removal script returned error exit status 1
>
> Status in cups package in Ubuntu:
> Confirmed
>
> Bug description:
> This is in xenial-proposed, please block release to -updates
> accordingly :)
>
> ProblemType: Package
> DistroRelease: Ubuntu 16.04
> Package: cups-daemon 2.1.3-4
> ProcVersionSignature: Ubuntu 4.4.0-46.67-generic 4.4.24
> Uname: Linux 4.4.0-46-generic x86_64
> NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
> ApportVersion: 2.20.1-0ubuntu2.1
> Architecture: amd64
> CupsErrorLog:
>
> Date: Fri Nov 18 11:13:15 2016
> ErrorMessage: subprocess new pre-removal script returned error exit
> status 1
> InstallationDate: Installed on 2016-05-02 (200 days ago)
> InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
> (20160420.1)
> Lpstat: device for mallards-officejet-pro-8600: dnssd://Officejet%20Pro%
> 208600%20%5BD63461%5D._ipp._tcp.local/?uuid=1c852a4d-b800-
> 1f08-abcd-d89d67d63461
> MachineType: Dell Inc. XPS 15 9550
> Papersize: a4
> PpdFiles: mallards-officejet-pro-8600: HP Officejet Pro 8600, hpcups
> 3.16.3
> ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-46-generic.efi.signed
> root=UUID=3643ef37-7cee-41b3-9387-2faa819c44db ro quiet splash
> vt.handoff=7
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-46-generic.efi.signed
> root=UUID=3643ef37-7cee-41b3-9387-2faa819c44db ro quiet splash
> vt.handoff=7
> RelatedPackageVersions:
> dpkg 1.18.4ubuntu1.1
> apt 1.2.15
> SourcePackage: cups
> Title: package cups-daemon 2.1.3-4 failed to install/upgrade: subprocess
> new pre-removal script returned error exit status 1
> UpgradeStatus: No upgrade log present (probably fresh install)
> dmi.bios.date: 04/07/2016
> dmi.bios.vendor: Dell Inc.
> dmi.bios.version: 01.02.00
> dmi.board.name: 0N7TVV
> dmi.board.vendor: Dell Inc.
> dmi.board.version: A00
> dmi.chassis.type: 9
> dmi.chassis.vendor: Dell Inc.
> dmi.modalias: dmi:bvnDellInc.:bvr01.02.00:bd04/07/2016:svnDellInc.:
> pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
> dmi.product.name: XPS 15 9550
> dmi.sys.vendor: Dell Inc.
>
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