$ git clone -n https://src.fedoraproject.org/rpms/perl-Log-Fmt-XS.git /var/lib/mock/f45-build-24547-604/root/chroot_tmpdir/scmroot/perl-Log-Fmt-XS
Cloning into '/var/lib/mock/f45-build-24547-604/root/chroot_tmpdir/scmroot/perl-Log-Fmt-XS'...
$ git fetch origin bc85358e85007ec5aa97e187ce3e43fff784099f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Log-Fmt-XS
 * [new ref]         bc85358e85007ec5aa97e187ce3e43fff784099f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc85358 Perl 5.44 rebuild