The feature clean-logs calls PORT_LOGDIR_CLEAN. In some circumstancies the program called can delete data on your disks regardless of your mount points. If PORTDIR is set to a wrong pathname, the command 'find' will scan through all the mount points and delete files except summary.log*. If the user is portage, it harms only that user. That is not what is expected. In my case, I had the wrong idea to set it to /var/tmp and mount filesystems like /usr/portage in order to boot strap gentoo, like that: $ portageq envvar PORT_LOGDIR /var/tmp $ vi /usr/share/portage/config/make.globals # Executed before emerge exit if FEATURES=c PORT_LOGDIR_CLEAN="find \"\${PORT_LOGDIR}\" -type f ! -name \"summary.log*\" -mtime +7 -delete" $ mount | grep bootstrap /dev/mapper/vg1-portage on /var/tmp/bootstrap/usr/portage type ext4 (ro,relatime,errors=remount-ro,stripe=384,data=ordered) /dev/mapper/sys-src on /var/tmp/bootstrap/usr/src/linux type ext4 (ro,relatime,errors=remount-ro,stripe=256,data=ordered) tmpfs on /var/tmp/bootstrap/var/tmp type tmpfs (rw,noatime,size=6442336k) tmpfs on /var/tmp/bootstrap/tmp type tmpfs (rw,noatime,size=6442336k) proc on /var/tmp/bootstrap/proc type proc (rw,relatime) sysfs on /var/tmp/bootstrap/sys type sysfs (rw,nosuid,nodev,noexec,relatime) devtmpfs on /var/tmp/bootstrap/dev type devtmpfs (rw,nosuid,relatime,size=5120k,nr_inodes=51200,mode=755) none on /var/tmp/bootstrap/dev/pts type devpts (rw,relatime,mode=600,ptmxmode=000) After a succesful emerge I get [...] find: cannot delete `/var/tmp/bootstrap/usr/portage/games-fps/ut2004-da2/ut2004-da2-1.6_beta.ebuild': Read-only file system find: cannot delete `/var/tmp/bootstrap/usr/portage/games-fps/ut2003-bonuspack-de/metadata.xml': Read-only file system find: cannot delete `/var/tmp/bootstrap/usr/portage/games-fps/ut2003-bonuspack-de/ChangeLog': Read-only file system find: cannot delete `/var/tmp/bootstrap/usr/portage/games-fps/ut2003-bonuspack-de/Manifest': Read-only file system find: cannot delete `/var/tmp/bootstrap/usr/portage/games-fps/ut2003-bonuspack-de/ut2003-bonuspack-de-1.ebuild': Read-only file system find: cannot delete `/var/tmp/bootstrap/usr/portage/scripts/bootstrap.sh': Read-only file system find: cannot delete `/var/tmp/bootstrap/usr/portage/skel.metadata.xml': Read-only file system * PORT_LOGDIR_CLEAN command returned 1 * See the make.conf(5) man page for PORT_LOGDIR_CLEAN usage instructions. Hopefully, /usr/portage was read only ;) My suggestion is to add one or more options to the 'find' command, 1. -mindepth 1 -maxdepth 1 to limit the deletes 2. -xdev to not descend directories on other filesystems 3. find ${PORT_LOGDIR}/{elog,ebuild,portage} for instance in case PORT_LOGDIR is wrong. Portage manages only an empty PORT_LOGDIR variable.