$ git clone -n https://src.fedoraproject.org/rpms/perl-Compress-Raw-Bzip2.git /var/lib/mock/f40-build-778137-129787/root/chroot_tmpdir/scmroot/perl-Compress-Raw-Bzip2
Cloning into '/var/lib/mock/f40-build-778137-129787/root/chroot_tmpdir/scmroot/perl-Compress-Raw-Bzip2'...
$ git fetch origin 1fcc1bcbba0820d2b42f4badffd5bc8eb959af8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Compress-Raw-Bzip2
 * [new ref]         1fcc1bcbba0820d2b42f4badffd5bc8eb959af8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fcc1bc 2.209 bump (rhbz#2265215)