$ git clone -n https://src.fedoraproject.org/rpms/rustup.git /var/lib/mock/f41-build-819356-151607/root/chroot_tmpdir/scmroot/rustup
Cloning into '/var/lib/mock/f41-build-819356-151607/root/chroot_tmpdir/scmroot/rustup'...
$ git fetch origin 1918d6ac4cb6d36757ab442ef6a0aec45282611d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rustup
 * [new ref]         1918d6ac4cb6d36757ab442ef6a0aec45282611d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1918d6a Update pulldown-cmark to version 0.11