$ git clone -n https://src.fedoraproject.org/rpms/rust-fend-core.git /var/lib/mock/f42-build-side-1-3537147-46559/root/chroot_tmpdir/scmroot/rust-fend-core
Cloning into '/var/lib/mock/f42-build-side-1-3537147-46559/root/chroot_tmpdir/scmroot/rust-fend-core'...
$ git fetch origin 75d8ccc76f2d6c885454da5fba98edeaa252254a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fend-core
 * [new ref]         75d8ccc76f2d6c885454da5fba98edeaa252254a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75d8ccc Update to version 1.5.6; Fixes RHBZ#2352498