$ git clone -n https://src.fedoraproject.org/rpms/rust-pkcs5.git /var/lib/mock/f45-build-43875-807/root/chroot_tmpdir/scmroot/rust-pkcs5
Cloning into '/var/lib/mock/f45-build-43875-807/root/chroot_tmpdir/scmroot/rust-pkcs5'...
$ git fetch origin a7cc6fac931c761b6afa6a866954658d90e21b76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pkcs5
 * [new ref]         a7cc6fac931c761b6afa6a866954658d90e21b76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7cc6fa Update to version 0.8.1; Fixes RHBZ#2461599