$ git clone -n https://src.fedoraproject.org/rpms/rust-git-delta.git /var/lib/mock/f41-build-side-1-3124899-39482/root/chroot_tmpdir/scmroot/rust-git-delta
Cloning into '/var/lib/mock/f41-build-side-1-3124899-39482/root/chroot_tmpdir/scmroot/rust-git-delta'...
$ git fetch origin 28f7eeb325ef041ecbefb00d84b345783f78a23f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git-delta
 * [new ref]         28f7eeb325ef041ecbefb00d84b345783f78a23f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28f7eeb Bump git2 dependency from 0.18 to 0.19