On Tue, 2022-11-15 at 04:09 -0800, Markus Held wrote:

Hello,

I try to use yocto SSTATE_MIRROR with a custom distribution (RDK:
https://developer.rdkcentral.com/) and enabled yocto multilib
support.
The sstate directory is created by my build server and published with
nginx to the developer machines.

Environment:
Bitbake 1.46.0 / Yocto Dunfell 3.1
TUNE_PKGARCH = “cortexa53t2hf-neon-fp-armv8”
MULTILIBS = "multilib:lib32"
TARGET_VENDOR="-rdk"
TARGET_OS="linux"

When a developer configures the sstate mirror in his local.conf:

SSTATE_MIRRORS ?= " file://.* http://<build server>/sstate-
cache/PATH;downloadfilename=PATH "

the build gets stuck on various _setscene tasks and does not
continue. I did some debugging and the issue is related the with file
name length of the sstate files. When the developer machine tries to
download a file from the mirror, bitbake fetch wants to create a
local lock file with name "<file name>.lock". Example of a sstate
lock file that fails for me:

sstate:lib32-dibbler:cortexa53t2hf-neon-fp-armv8-rdkmllib32-linux-
gnueabi:1.0.1+1.0.2RC1+gitc4b0ed52e751da7823dd9a36e91f93a6310e5525:r0
:cortexa53t2hf-neon-fp-
armv8:3:169be56e277b6922d1cca3f23f6d56033812941a438f09a477cd96999d7d0
801_package_qa.tgz.siginfo.lock

This lock file cannot be created on a ext file system due the file
name length > 255. This causes the _setscene task to get stuck
indefinitely. It seems like most Linux file systems only support file
names up to 255 bytes.

Is there a way to configure or limit the file name length of the
sstate cache files? Or a way to avoid the issue with the .lock file?

There were changes in bitbake:

https://git.yoctoproject.org/poky/commit/bitbake/lib/bb/utils.py?id=273b124bf6acd77b074fde2421be331721a68c11
https://git.yoctoproject.org/poky/commit/bitbake/lib/bb/utils.py?id=09e826cfb021731c1b139046665d2d9fa24baa88

There were also sstate class changes:

https://git.yoctoproject.org/poky/commit/meta/classes/sstate.bbclass?id=b8025e972081b70960ffcbcbe43a7118041556a1
https://git.yoctoproject.org/poky/commit/meta/classes/sstate.bbclass?id=ed4bdd0f9149ba24fac375fd3af8bb2a06423105
https://git.yoctoproject.org/poky/commit/meta/classes/sstate.bbclass?id=4c6efbf03530b6f60cde59cdef61aa14538753a3