$ git clone -n https://src.fedoraproject.org/rpms/perl-Package-Stash-XS.git /var/lib/mock/f45-build-25644-612/root/chroot_tmpdir/scmroot/perl-Package-Stash-XS
Cloning into '/var/lib/mock/f45-build-25644-612/root/chroot_tmpdir/scmroot/perl-Package-Stash-XS'...
$ git fetch origin c32ba7d7548f3b98a966daae7650763b8175025e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Package-Stash-XS
 * [new ref]         c32ba7d7548f3b98a966daae7650763b8175025e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c32ba7d Perl 5.44 rebuild