$ git clone -n https://src.fedoraproject.org/rpms/rust-pbkdf2_0.12.git /var/lib/mock/f45-build-43712-805/root/chroot_tmpdir/scmroot/rust-pbkdf2_0.12
Cloning into '/var/lib/mock/f45-build-43712-805/root/chroot_tmpdir/scmroot/rust-pbkdf2_0.12'...
$ git fetch origin c79252bc95aad68c488df58b6c130a99ba8c2b72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pbkdf2_0.12
 * [new ref]         c79252bc95aad68c488df58b6c130a99ba8c2b72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c79252b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild