2021. 08. 23. 15:23 keltezéssel, Richard Purdie írta:
On Mon, 2021-08-23 at 15:14 +0200, Zoltan Boszormenyi via lists.openembedded.org
wrote:
It's documented at www.rpm.org, Red Hat and SuSE.
https://docs.fedoraproject.org/en-US/packaging-guidelines/Scriptlets/
https://en.opensuse.org/openSUSE:Packaging_scriptlet_snippets
https://rpm-packaging-guide.github.io/
It's available since RPM 4.4. RPM 4.16.1.3 is in Hardknott.
A short Google search showed that *maybe* dpkg also supports it,
or at least there are(were?) plans to implement it:
https://wiki.debian.org/i18n/TranslationDebsProposals
With postinst, the time when the scriptlet runs may depend
on the order of the packages in the upgrade transaction and
may run with the older binaries in place.
The posttrans scriptlet runs at the very end of the
install/upgrade transaction, just like the OPKG "intercept"
scripts.
I successfully tested it long ago with a kernel upgrade
that was running dracut on the new version, plus a dracut
upgrade in the same session. Dissecting the initramfs proved
that with postinst, the old dracut version generated it,
while with posttrans, the new one did.
Who would want to use it? Anyone who needs some finalizer
script to be run at the end of an RPM/DNF transaction.
I started on Angstrom and I know opkg doesn't implement this
and Yocto inherited it. This patch is basically a heads up
that there's another way to do the same thing. Maybe opkg
implements this some day, maybe not. Anyway, Yocto in general
will need more changes before the main package.bbclass can
start to use it for all package formats.
There is a bigger issue here which is how can anyone use this without making
their recipe rpm specific? I'm very reluctant to add functionality like this
unless we have a way to emulate it or fall back on the other package formats.
Indeed. This patch can be dropped.
Full disclosure: I don't use this anymore, since I implemented
another two bbclass recipes to generate the kernel's initramfs
either during the kernel build (and ship it in a subpackage) or
during do_rootfs and move it out of the way in the image postprocess
script so e.g. a squashfs image will have it separately.
They work well for my use limited cases:
* full OS installed on disk
* squashfs for PXE-based remote booted machines
FYI: the dracutsysrootdir feature in recent dracut versions is my work.
I just carried this patch for a couple of years now and I thought maybe
someone sees some value in it.
The intercept pieces are used by both rpm and opkg and actually do something
slightly different, they stack common calls until the end of the transaction.
This means for example we can call "ldconfig" once rather than in every
postinst.
Cheers,
Richard
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