With logrotate 3.21.0.61_cb99

The following configuration:

/var/log/foo.log
{
    copytruncate
    compress
}

Fails with

error: unable to open /var/log/foo.log.1 (read-only) for compression: No such file or directory

This is because rotateSingleLog calls copyTruncate with rotateCount=0 hence:

skip copying /var/log/foo.log to /var/log/foo.log.1

And in postrotateSingleLog we call compressLogFile which gives the earlier error.

Calling logrotate in debug does not check this (early return in compressLogFile).

I guess one could check that when giving copyTruncate and compress , rotate needs to be above 0.

Note that without compress, /var/log/foo.log is just truncated.