$ git clone -n https://src.fedoraproject.org/rpms/rust-snafu.git /var/lib/mock/f40-build-703982-12986/root/chroot_tmpdir/scmroot/rust-snafu
Cloning into '/var/lib/mock/f40-build-703982-12986/root/chroot_tmpdir/scmroot/rust-snafu'...
$ git fetch origin ebe7fd3a356f7a384b4ab5dc13b55c9b76fcdea1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-snafu
 * [new ref]         ebe7fd3a356f7a384b4ab5dc13b55c9b76fcdea1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebe7fd3 Update to version 0.8.3; Fixes RHBZ#2266125