The problem is rather the opposite; the aufs in the kernel is newer than
the synced aufs-tools. And I just recently found out that aufs for 5.x
kernels is hosted in a different git repository, which explains why we
haven't been seeing any tags for 5.x kernels (and thus the version is
still 4.x-rcN).
For focal then we likely need to update aufs-tools from
https://github.com/sfjro/aufs5-standalone
and update aufs-tools every time we update the kernel support. However, if the
tools and kernel support really are version locked as this build error implies,
that seems to pose a problem for hwe kernels.
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https://bugs.launchpad.net/bugs/1851447
Title:
aufs-tools 4.14 FTBFS because of wrong SAUCE driver in the kernel
Status in linux package in Ubuntu:
Confirmed
Bug description:
The latest aufs-tools package synced from Debian fails to build in
Ubuntu (but not in Debian) because the Ubuntu kernel package has aufs
sauce patches and they are not at a compatible version.
[...]
dh_auto_install
install -d /<>/aufs-tools-4.14\+20190211/debian/aufs-tools
make -j4 install
DESTDIR=/<>/aufs-tools-4.14\+20190211/debian/aufs-tools
AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
make[1]: Entering directory '/<>/aufs-tools-4.14+20190211'
cc -g -O2 -fdebug-prefix-map=/<>/aufs-tools-4.14+20190211=.
-fstack-protector-strong -Wformat -Werror=format-security -O -Wall -Wdate-time
-D_FORTIFY_SOURCE=2 -D_GNU_SOURCE -I./libau -DAUFHSM_CMD=\"/usr/bin/aufhsm\"
-DMOUNT_CMD=\"/bin/mount\" -DUMOUNT_CMD=\"/bin/umount\"
-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now ver.c -o ver
./ver
Wrong version!
aufs-util for aufs4.14 20190211, but aufs is 4.x-rcN-20190805.
See README in detail and try git branch -a.
make[1]: *** [Makefile:120: ver_test] Error 255
rm ver
[...]
(https://launchpad.net/ubuntu/+source/aufs-
tools/1:4.14+20190211-1/+build/17953990)
Please either update the aufs patches in the kernel tree, or else drop
them.
(My understanding is that we probably don't want to drop them because
docker may use aufs as a backend; and while this is deprecated, there
is currently no upgrade story for users currently using it.)
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