[Gentoo] Logrotating emerge.log

It seems the reason why emerge.log is not logrotate‘d is that log analyzers (qlop and genlop) expect a full log. I’m not sure about qlop, but since I use only genlop, it seems okay to add it to /etc/logrotate.d – genlop supports reading logs from multiple files and also from compressed files (gzip and bzip2).

Create a logrotate configuration file. /etc/logrotate.d/emergelog:

/var/log/emerge.log {
    compresscmd /bin/bzip2
    uncompresscmd /bin/bunzip2
    compressext .bz2
    rotate 100
    create 660 portage portage
    delaycompress
    daily
    size 2M
}

I configured my logrotate to compress using lzma by default, but genlop recognizes only gz and bz2, so I need to explicitly specify bzip2 (or gzip) here.

A wrapper for genlop is also necessary. /usr/local/bin/genlop:

#!/bin/bash

f=()
for x in /var/log/emerge.log*; do
    f=("${f[@]}" -f "$x")
done
exec /usr/bin/genlop "${f[@]}" "$@"

Tags: Gentoo, Linux, logrotate, portage