$ git clone -n https://src.fedoraproject.org/rpms/perl-Compress-Raw-Zlib.git /var/lib/mock/f40-build-778140-129787/root/chroot_tmpdir/scmroot/perl-Compress-Raw-Zlib
Cloning into '/var/lib/mock/f40-build-778140-129787/root/chroot_tmpdir/scmroot/perl-Compress-Raw-Zlib'...
$ git fetch origin f6127045f8963fda59a53886f8f645d38fbd0b44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Compress-Raw-Zlib
 * [new ref]         f6127045f8963fda59a53886f8f645d38fbd0b44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f612704 2.208 bump (rhbz#2265216)