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pjp
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Joined: 16 Apr 2002
Posts: 20067
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 Posted: Wed Aug 03, 2022 8:43 pm Post subject: Prune linux-firmware non-greedy |
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Prerequisites:
File names of firmware to be retained.
Some ability to work with awk regular expressions (or an alternative tool, suitably exchanged for awk).
What it does:
Applies a filter based on a common portion of firmware filenames.
Intercepts the emerge process during the install phase, replacing contents of the "WHENCE" file to contain only filtered list of files.
Creates a linux-firmware-<version> savedconfig file during the instprep phase.
Portage continues the install as normal, only installing the desired firmware files and an appropriate savedconfig file.
Potential Issues:
If a filter were to exclude all versions of needed firmware, the system may have a loss of functionality.
Example: With no available wireless firmware, wireless networking might be unable to start. Therefore, it may be useful to keep the last known working versions available. See: emerge --buildpkg option (man emerge) and the location of PKGDIR (man make.conf).
Partial example:
NOTE:
* Pattern matching has been moved external from the script into the file referenced by "FILTER_FILE".
* awk is still used, which may have different syntax than expected. For example, an asterisk pattern match in awk should be a dot followed by an asterisk, as in: .*
(output shortened, including use of "wc -l") | Code: | $ ebuild /var/db/repos/gentoo/sys-kernel/linux-firmware/linux-firmware-20220708.ebuild install
$ cd /var/tmp/portage/sys-kernel/linux-firmware-20220708/temp/ |
awk pattern match keeping all rtl_nic files or select rtl_nic files: | Code: | $ awk '/rtl_nic/ { print $0 }' WHENCE |wc -l
31
$ awk '/rtl_nic\/rtl8(168|411)/ { print $0 }' WHENCE |wc -l
15 |
Modify the awk pattern match to suit your needs.
New hardware requires new files:
Either move the file from he env path location temporarily.
Or use the previously show ebuild command to identify new files (located in /var/tmp/portage/sys-kernel/linux-firmware-20220708/work/).
The code: | /etc/portage/env/sys-kernel/linux-firmware.filter: | rtl_nic/rtl8(168|411)
amd-ucode/microcode_amd(_fam16h)?.bin |
| /etc/portage/env/sys-kernel/linux-firmware: | # This may not be a good location. However, Portage warns about atom errors under package.env
FILTER_FILE="/etc/portage/env/sys-kernel/linux-firmware.filter"
# | Ebuild Phase: install |
if [ "${CATEGORY}" == "sys-kernel" ] && \
[ "${PN}" == "linux-firmware" ] && \
[ "${EBUILD_PHASE}" == "install" ] && \
[ -e ${FILTER_FILE} ]
then
# WORKDIR : ebuild root build directory: "${PORTAGE_BUILDDIR}/work"
local wf
# Per ebuild comment, MY_COMMIT is:
# - used for a "real snapshot"
# - or left blank for tagged releases
if [[ -z ${MY_COMMIT} ]] ; then
wf="${WORKDIR}/${P}/WHENCE"
else
wf="${WORKDIR}/${MY_COMMIT}/WHENCE"
fi
/bin/cp -a ${wf} ${T}/ \
|| die "Error copying ${wf} to temp directory."
/usr/bin/awk 'NR==FNR{patterns[$1]; next} {for (p in patterns) if ($0 ~ p) print $0}' ${FILTER_FILE} "${T}/WHENCE" > "${wf}" \
|| die "Error creating new ${wf} file."
fi
# | Ebuild Phase: instprep |
if [ "${CATEGORY}" == "sys-kernel" ] && \
[ "${PN}" == "linux-firmware" ] && \
[ "${EBUILD_PHASE}" == "instprep" ] && \
[ -e ${FILTER_FILE} ]
then
local sc
# modify image directory
sc="${D}/etc/portage/savedconfig/sys-kernel/${PF}"
/bin/cp -a ${sc} ${T}/ \
|| die "Error copying ${sc} to temp directory."
# Example: "${T}/linux-firmware-20220708"
awk '/^#/ { print $0 }' "${T}/${PF}" > "${sc}" \
|| die "Error preparing new ${sc} file."
# Sort the file.
awk '/^(amd|rtl)/ { print $0 }' "${T}/${PF}" |sort >> "${sc}" \
|| die "Error populating new ${sc} file."
fi |
EDIT:
- Fixed a conditional logic error with the FILTER_FILE check.
- Moved awk patterns to FILTER_FILE location. Tested a few pattern variations using "ebuild ... install".
- Updated to accommodate versions using MY_COMMIT
- Replaced incorrect uses of ${P} with ${PF}
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Quis separabit? Quo animo? |
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