$ git clone -n https://src.fedoraproject.org/rpms/rust-papaya.git /var/lib/mock/f45-build-43706-805/root/chroot_tmpdir/scmroot/rust-papaya
Cloning into '/var/lib/mock/f45-build-43706-805/root/chroot_tmpdir/scmroot/rust-papaya'...
$ git fetch origin 52ce92052928758c9d9d9a0a7943c9cdd609cd38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-papaya
 * [new ref]         52ce92052928758c9d9d9a0a7943c9cdd609cd38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52ce920 Update to version 0.2.5; Fixes RHBZ#2521262