$ git clone -n https://src.fedoraproject.org/rpms/perl-File-Sync.git /var/lib/mock/f45-build-23583-598/root/chroot_tmpdir/scmroot/perl-File-Sync
Cloning into '/var/lib/mock/f45-build-23583-598/root/chroot_tmpdir/scmroot/perl-File-Sync'...
$ git fetch origin 5d44918d29c7055f7618e4a6c23af4798f74bb61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-Sync
 * [new ref]         5d44918d29c7055f7618e4a6c23af4798f74bb61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d44918 Perl 5.44 rebuild