Re: [yocto] installs files in /var/volatile

[Gyorgy Sarvari <skandigraun@gmail.com>]

On 01.02.25 21:46, Daniel Kampert via lists.yoctoproject.org wrote:
> Hi,
> I´m building a layer to install wmbusmeters for Kirkstone and I run 
> into this issue:
> ERROR: wmbusmeters-1.18.0-r0 do_package_qa: QA Issue: wmbusmeters 
> installs files in /var/volatile, but it is expected to be empty 
> [empty-dirs]
> What does it mean and where does it come from / how can I solve it? My 
> recipe looks like this

What does it mean - There are a number of folders that are not expected 
to contain
files installed by application due to various reasons. One QA check[1] 
ensures that
this is respected by the packages.

Where it come from - The Makefile installs some directories in the 
/var/volatile folder.
Frequently this folder is tmpfs, but even when it is not, its content is 
considered ephemeral, so
installing anything here is frequently a bug. It can be used as a 
temporary folder during runtime, but
if an application needs to store anything that will be needed after a 
reboot, this folder
is not a good place.

How can I solve it - There are a couple of ways. A couple of 
non-exhaustive options:
- Delete this folder in a do_install:append() function ("rm -rf 
${D}${localstatedir}/log" or something
along the lines), and simply try to start the application. Maybe it 
re-creates the folder upon startup,
and it will just work.
- Do the same as in the previous suggestion, but add "--logfile=syslog" 
as a starting argument
in your systemd unit file. Based on the readme this should make your 
application to use
the syslog for its logs instead of a dedicated file.
- If none if this is working for you, delete the folder still, but look 
into tmpfiles.d [2]
and its configuration, how to recreate this folder during boot. This 
service creates folders and
files early during startup, it is usable exactly in such cases. You can 
find a couple examples of its
usage in Yocto also[3].

[1]: https://docs.yoctoproject.org/4.0.24/ref-manual/qa-checks.html
[2]: https://www.freedesktop.org/software/systemd/man/latest/tmpfiles.d.html
[3]: e.g. 
https://git.yoctoproject.org/poky/tree/meta/recipes-extended/pam/libpam_1.5.2.bb?h=kirkstone#n137
> /inherit autotools-brokensep pkgconfig/
> /DESCRIPTION = "The program acquires utility meter readings from wired 
> m-bus or wireless wm-bus meters."/
> /HOMEPAGE = "https://github.com/wmbusmeters/wmbusmeters"/
> /LICENSE = "GPL-3.0-only"/
> /LIC_FILES_CHKSUM = 
> "file://${COMMON_LICENSE_DIR}/GPL-3.0-only;md5=c79ff39f19dfec6d293b95dea7b07891"/ 
>
> /# The Makefile is stripping. Overwrite the "STRIP" variable in the 
> Makefile and use the stripping from Yocto/
> /EXTRA_OEMAKE += "STRIP=true"/
> /CXXFLAGS += "-DLIBXML_DOCB_ENABLED"/
> /SRC_URI = " \/
> /file://0001-set-libxml2-cxxflags-by-pkg-config.patch \/
> /git://github.com/wmbusmeters/wmbusmeters;protocol=https;branch=master \/
> /"/
> /# Use version 1.18.0/
> /SRCREV = "2f2720d9d8e043304a366d11d933be9d535e17a5"/
> /DEPENDS = "rtlsdr icu libxml2"/
> /RDEPENDS:${PN} = "rtlsdr icu"/
> /S = "${WORKDIR}/git"/
> /FILES:${PN} = " etc \/
> /var \/
> /lib \/
> /usr/bin \/
> /usr/sbin \/
> /${systemd_system_unitdir}/system/wmbusmeters.service \/
> /"/
> /SYSTEMD_SERVICE:${PN} = "wmbusmeters.service"/
> /SYSTEMD_AUTO_ENABLE:${PN} = "enable"/
> Thanks for help!
> Mit freundlichen Grüßen / With kind regards
> Ing. Daniel Kampert, M. Sc.
> Embedded Systems Solutions
> Address: Hauptstr. 36 | 91469 Hagenbüchach | Deutschland
> Phone: +49 (0)174 6932561
> E-Mail: kontakt@daniel-kampert.de
> Web: www.daniel-kampert.de <https://www.daniel-kampert.de>
>
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