zcat is broken when any seamless compression option but gz is set

[Thomas De Schampheleire]

El vie., 17 abr. 2020 a las 20:05, Thomas De Schampheleire
(<patrickdepinguin at gmail.com>) escribió:
>
> Hello,
>
> When setting no seamless compression option
> (ENABLE_FEATURE_SEAMLESS_xxxx) at all, then zcat works fine.
>
> When enabling at least one such option, e.g.
> ENABLE_FEATURE_SEAMLESS_XZ, but not ENABLE_FEATURE_SEAMLESS_GZ, then
> zcat is suddenly broken with following output:
>
>     $ ./busybox zcat /proc/config.gz
>     zcat: no gzip/xz magic
>
> When additionally enabling ENABLE_FEATURE_SEAMLESS_GZ, zcat is working again.
>
> This behavior is odd from the user perspective. One does not expect
> that enabling seamless xz compression will break something else like
> zcat.
>
> Would it be possible to either fix this behavior, or prevent such
> 'invalid' configuration?

Any feedback please?