[bug#54379] [PATCH] gnu: linux: update PipeWire & WirePlumber

[fesoj000 <fesoj000@gmail.com>]

On 3/31/22 7:40 AM, Brendan Tildesley wrote:
>> So far it was perfect to have the immutable default config in the store and reference it for your own
>> settings. Especially after a breaking change in pipewire, this immutable config in the store path can be
>> very valuable to get a working setup again.
>>
>> I do not care what the default config directory is, but i would like to keep the default config as part
>> of the package.
>>
>> BR
> You don't need to worry about that because the default config is in share/ not etc/. There is nothing in the etc/ besides ld.so.cache
> 
> This is how pipewire accesses config without sysconfigdir set:
> 
> b@jiu ~/code/guix [env]$ strace /gnu/store/kvyhx5i5a6i63iihp20wj3yikhvf4si7-pipewire-0.3.48/bin/pipewire 2>&1|rg '^access'
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf", R_OK) = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf", R_OK) = -1 ENOENT (No such file or directory)
> access("/gnu/store/kvyhx5i5a6i63iihp20wj3yikhvf4si7-pipewire-0.3.48/etc/pipewire/pipewire.conf", R_OK) = -1 ENOENT (No such file or directory)
> access("/gnu/store/kvyhx5i5a6i63iihp20wj3yikhvf4si7-pipewire-0.3.48/share/pipewire/pipewire.conf", R_OK) = 0
> access("/gnu/store/kvyhx5i5a6i63iihp20wj3yikhvf4si7-pipewire-0.3.48/share/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> access("/gnu/store/kvyhx5i5a6i63iihp20wj3yikhvf4si7-pipewire-0.3.48/etc/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> 
> setting it just makes it do this:
> 
> b@jiu ~ [env]$ strace pipewire 2>&1|grep '^access'
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf", R_OK) = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf", R_OK) = -1 ENOENT (No such file or directory)
> access("/etc/pipewire/pipewire.conf", R_OK) = -1 ENOENT (No such file or directory)
> access("/gnu/store/p7wpq9axacrzk43whbvg6r4f3v0bkyvz-pipewire-0.3.48/share/pipewire/pipewire.conf", R_OK) = 0
> access("/gnu/store/p7wpq9axacrzk43whbvg6r4f3v0bkyvz-pipewire-0.3.48/share/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> access("/etc/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> access("/home/b/.config/pipewire/pipewire.conf.d", R_OK) = -1 ENOENT (No such file or directory)
> 
> So it allows for global config to be set in /etc without PIPEWIRE_CONFIG_DIR. Note that PIPEWIRE_CONFIG_DIR isn't practical as a default
> 
> because it sets the /only/ config dir and prevents any lookup in home .config.
OK, that make sense.