newsyslog(8): Add support of specifying compression method in configuration file.

[delphij]

Summary

Administrators can now specify a global compression method directly
at the beginning of the newsyslog.conf file, for example:

<compress> none

MFC after: 1 week

[zarychtam_plan-b.pwste.edu.pl]

Will it be possible to use legacy settings and compress logs using different tools, for example, some files with bzip2, others with xz and a few with zstd ?

I suppose it will work with
<compress> legacy
what I hope will be the default

[dvl]

This seems to correspond to the recently added command line option: -c

[• karels]

I think this is a step in the right direction (having the compression specified in the config file), but I think it needs better integration with the existing flags. For example, there could be a new flag selecting the default as specified with <compress>, replacing J in the default config file lines.

[netchild]

usr.sbin/newsyslog/newsyslog.c

524

I agree with the classification in the email thread about "legacy" being a time variant classification. What about "pre15" or "v1" or "perlog" (as in "apply the compression settings as specified per log file compression flag") instead?