$ git clone -n https://src.fedoraproject.org/rpms/rust-pbkdf2_0.11.git /var/lib/mock/f41-build-side-1-3134867-39763/root/chroot_tmpdir/scmroot/rust-pbkdf2_0.11
Cloning into '/var/lib/mock/f41-build-side-1-3134867-39763/root/chroot_tmpdir/scmroot/rust-pbkdf2_0.11'...
$ git fetch origin 4105e9bff1a0e49d257bd00e8f1000e814e21d5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pbkdf2_0.11
 * [new ref]         4105e9bff1a0e49d257bd00e8f1000e814e21d5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4105e9b compat package no longer needed