$ git clone -n https://src.fedoraproject.org/rpms/rust-pem3.git /var/lib/mock/f45-build-43789-805/root/chroot_tmpdir/scmroot/rust-pem3
Cloning into '/var/lib/mock/f45-build-43789-805/root/chroot_tmpdir/scmroot/rust-pem3'...
$ git fetch origin b1ea28a7ae80d82a4f78fca54325c976015aeb05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pem3
 * [new ref]         b1ea28a7ae80d82a4f78fca54325c976015aeb05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1ea28a Initial import (pem v3 compat package)