$ git clone -n https://src.fedoraproject.org/rpms/perl-Time-timegm.git /var/lib/mock/f45-build-27211-621/root/chroot_tmpdir/scmroot/perl-Time-timegm
Cloning into '/var/lib/mock/f45-build-27211-621/root/chroot_tmpdir/scmroot/perl-Time-timegm'...
$ git fetch origin 0159d7106dd390ecad77f8fadc5a5e1b659884f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Time-timegm
 * [new ref]         0159d7106dd390ecad77f8fadc5a5e1b659884f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0159d71 Perl 5.44 rebuild