$ git clone -n https://src.fedoraproject.org/rpms/rust-ctrlc.git /var/lib/mock/f42-build-side-1-3583020-46887/root/chroot_tmpdir/scmroot/rust-ctrlc
Cloning into '/var/lib/mock/f42-build-side-1-3583020-46887/root/chroot_tmpdir/scmroot/rust-ctrlc'...
$ git fetch origin 47cb5bd3848c3b28186e61753ee61b394fa8eca4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ctrlc
 * [new ref]         47cb5bd3848c3b28186e61753ee61b394fa8eca4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47cb5bd Update to version 3.4.7; Fixes RHBZ#2365516