$ git clone -n https://src.fedoraproject.org/rpms/perl-Time-Warp.git /var/lib/mock/f45-build-27175-621/root/chroot_tmpdir/scmroot/perl-Time-Warp
Cloning into '/var/lib/mock/f45-build-27175-621/root/chroot_tmpdir/scmroot/perl-Time-Warp'...
$ git fetch origin 51b05dc69b56f3f77b18d70560988d13c5402396:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Time-Warp
 * [new ref]         51b05dc69b56f3f77b18d70560988d13c5402396 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51b05dc Perl 5.44 rebuild