$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-PBKDF2.git /var/lib/mock/f45-build-22635-593/root/chroot_tmpdir/scmroot/perl-Crypt-PBKDF2
Cloning into '/var/lib/mock/f45-build-22635-593/root/chroot_tmpdir/scmroot/perl-Crypt-PBKDF2'...
$ git fetch origin 068d9ceb9de95fc520329e361f2a3adffe82aca3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-PBKDF2
 * [new ref]         068d9ceb9de95fc520329e361f2a3adffe82aca3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 068d9ce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild