$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-compress.git /var/lib/mock/eln-build-side-115259-61078801-6588769/root/chroot_tmpdir/scmroot/apache-commons-compress
Cloning into '/var/lib/mock/eln-build-side-115259-61078801-6588769/root/chroot_tmpdir/scmroot/apache-commons-compress'...
$ git fetch origin 27497121119b27eba2378cf7a8991df302c7928b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-compress
 * [new ref]         27497121119b27eba2378cf7a8991df302c7928b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2749712 Replace unmappable character