Re: [systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
On Thu, 01.08.13 19:16, Jan Engelhardt (jeng...@inai.de) wrote:
On Tuesday 2013-07-30 02:12, Gerardo Exequiel Pozzi wrote:
In inside systemd unit, I want to avoid shell script if possible, using
units only, doing things in a systemd way. Anyway for complex tasks
where systemd does not fit, scripting seems to be necessary.
The systemd way is not {avoiding shell scripts at all cost},
but avoiding redundant code found in the many sysvinit scripts.
At least, that is how I see it.
Yes. We want to deemphasize shell scripts, and get them out of the
default boot, but shell is incredibly useful otherwise and here to stay.
Lennart
--
Lennart Poettering - Red Hat, Inc.
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Re: [systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
On Tuesday 2013-07-30 02:12, Gerardo Exequiel Pozzi wrote:
In inside systemd unit, I want to avoid shell script if possible, using
units only, doing things in a systemd way. Anyway for complex tasks
where systemd does not fit, scripting seems to be necessary.
The systemd way is not {avoiding shell scripts at all cost},
but avoiding redundant code found in the many sysvinit scripts.
At least, that is how I see it.
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Re: [systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
On Thu, 25.07.13 19:35, Gerardo Exequiel Pozzi (vmlinuz...@yahoo.com.ar) wrote: On 07/25/2013 05:06 PM, Lennart Poettering wrote: On Sat, 20.07.13 16:37, Gerardo Exequiel Pozzi (vmlinuz...@yahoo.com.ar) wrote: Hello I am maintainer of Archiso project (The Arch Linux live ISO creator). I like a feature for systemd within unit files, mainly for importing /proc/cmdline in initramfs stage, or in a generic form for any other file with a similar format. Something like ImportOneLineFile=, like current EnvironmentFile=. In this way, we can use/pass parameters to Exec*= directives if needed. So you awant to import kernel cmdline arguments into your environment? Yes, in a particular unit. Note that you can do that already with the systemd.setenv= kernel command line option. What else do you need? Yes. But doing in this way: * Makes each variable passed, global to all units. * For each parameter that I need to process I need to prefix them. So for example archisobasedir=arch archisolabel=ARCH_201307 checksum=y becomes: systemd.setenv=archisobasedir=arch systemd.setenv=archisolabel=ARCH_201307 systemd.setenv=checksum=y And if booting via PXE, think about automatic cmdline appended by ip=... PXELINUX/IPAPPEND... The other solution that I have is using a service+script for parsing/dumping cmdline in a file, then import with EnvironmentFile= but does not look good. Other way maybe is using a generator, but they run too early and I need to wait for some things happens before generating units in a dynamic way. Hmm, but how do you process those variables further? In a shell script anyway? That sounds as if it would be appropriate to also parse /proc/cmdline from there? Why would it be better to do this in systemd rather than in the shell script itself? (or similar: better than in the Pythons script itself, Perl script, C program ...) Lennart -- Lennart Poettering - Red Hat, Inc. ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
On 07/29/2013 08:12 PM, Lennart Poettering wrote: On Thu, 25.07.13 19:35, Gerardo Exequiel Pozzi (vmlinuz...@yahoo.com.ar) wrote: On 07/25/2013 05:06 PM, Lennart Poettering wrote: On Sat, 20.07.13 16:37, Gerardo Exequiel Pozzi (vmlinuz...@yahoo.com.ar) wrote: Hello I am maintainer of Archiso project (The Arch Linux live ISO creator). I like a feature for systemd within unit files, mainly for importing /proc/cmdline in initramfs stage, or in a generic form for any other file with a similar format. Something like ImportOneLineFile=, like current EnvironmentFile=. In this way, we can use/pass parameters to Exec*= directives if needed. So you awant to import kernel cmdline arguments into your environment? Yes, in a particular unit. Note that you can do that already with the systemd.setenv= kernel command line option. What else do you need? Yes. But doing in this way: * Makes each variable passed, global to all units. * For each parameter that I need to process I need to prefix them. So for example archisobasedir=arch archisolabel=ARCH_201307 checksum=y becomes: systemd.setenv=archisobasedir=arch systemd.setenv=archisolabel=ARCH_201307 systemd.setenv=checksum=y And if booting via PXE, think about automatic cmdline appended by ip=... PXELINUX/IPAPPEND... The other solution that I have is using a service+script for parsing/dumping cmdline in a file, then import with EnvironmentFile= but does not look good. Other way maybe is using a generator, but they run too early and I need to wait for some things happens before generating units in a dynamic way. Hmm, but how do you process those variables further? In a shell script anyway? That sounds as if it would be appropriate to also parse /proc/cmdline from there? Why would it be better to do this in systemd rather than in the shell script itself? (or similar: better than in the Pythons script itself, Perl script, C program ...) Lennart In inside systemd unit, I want to avoid shell script if possible, using units only, doing things in a systemd way. Anyway for complex tasks where systemd does not fit, scripting seems to be necessary. ExecStart=/usr/bin/program --param=$CMDLINE__ARG_VALUE ... I think is better because systemd already parse /proc/cmdline, and I guess that implementing this is easy, but maybe I am wrong. Thanks for your feedback. -- Gerardo Exequiel Pozzi \cos^2\alpha + \sin^2\alpha = 1 signature.asc Description: OpenPGP digital signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
On Sat, 20.07.13 16:37, Gerardo Exequiel Pozzi (vmlinuz...@yahoo.com.ar) wrote: Hello I am maintainer of Archiso project (The Arch Linux live ISO creator). I like a feature for systemd within unit files, mainly for importing /proc/cmdline in initramfs stage, or in a generic form for any other file with a similar format. Something like ImportOneLineFile=, like current EnvironmentFile=. In this way, we can use/pass parameters to Exec*= directives if needed. So you awant to import kernel cmdline arguments into your environment? Note that you can do that already with the systemd.setenv= kernel command line option. What else do you need? Lennart -- Lennart Poettering - Red Hat, Inc. ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
On 07/25/2013 05:06 PM, Lennart Poettering wrote: On Sat, 20.07.13 16:37, Gerardo Exequiel Pozzi (vmlinuz...@yahoo.com.ar) wrote: Hello I am maintainer of Archiso project (The Arch Linux live ISO creator). I like a feature for systemd within unit files, mainly for importing /proc/cmdline in initramfs stage, or in a generic form for any other file with a similar format. Something like ImportOneLineFile=, like current EnvironmentFile=. In this way, we can use/pass parameters to Exec*= directives if needed. So you awant to import kernel cmdline arguments into your environment? Yes, in a particular unit. Note that you can do that already with the systemd.setenv= kernel command line option. What else do you need? Yes. But doing in this way: * Makes each variable passed, global to all units. * For each parameter that I need to process I need to prefix them. So for example archisobasedir=arch archisolabel=ARCH_201307 checksum=y becomes: systemd.setenv=archisobasedir=arch systemd.setenv=archisolabel=ARCH_201307 systemd.setenv=checksum=y And if booting via PXE, think about automatic cmdline appended by ip=... PXELINUX/IPAPPEND... The other solution that I have is using a service+script for parsing/dumping cmdline in a file, then import with EnvironmentFile= but does not look good. Other way maybe is using a generator, but they run too early and I need to wait for some things happens before generating units in a dynamic way. Lennart Thanks for your attention. -- Gerardo Exequiel Pozzi \cos^2\alpha + \sin^2\alpha = 1 signature.asc Description: OpenPGP digital signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
[systemd-devel] [Feature request] A way to native import /proc/cmdline within unit
Hello I am maintainer of Archiso project (The Arch Linux live ISO creator). I like a feature for systemd within unit files, mainly for importing /proc/cmdline in initramfs stage, or in a generic form for any other file with a similar format. Something like ImportOneLineFile=, like current EnvironmentFile=. In this way, we can use/pass parameters to Exec*= directives if needed. Thanks you. -- Gerardo Exequiel Pozzi \cos^2\alpha + \sin^2\alpha = 1 signature.asc Description: OpenPGP digital signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
