$ git clone -n https://src.fedoraproject.org/rpms/rust-pbkdf2.git /var/lib/mock/f45-build-43704-805/root/chroot_tmpdir/scmroot/rust-pbkdf2
Cloning into '/var/lib/mock/f45-build-43704-805/root/chroot_tmpdir/scmroot/rust-pbkdf2'...
$ git fetch origin de2b54342033f815d5c965f1104548f0a9eff63b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pbkdf2
 * [new ref]         de2b54342033f815d5c965f1104548f0a9eff63b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de2b543 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild