$ git clone -n https://src.fedoraproject.org/rpms/rust-coreos-installer.git /var/lib/mock/f41-build-846646-163162/root/chroot_tmpdir/scmroot/rust-coreos-installer
Cloning into '/var/lib/mock/f41-build-846646-163162/root/chroot_tmpdir/scmroot/rust-coreos-installer'...
$ git fetch origin 8e300e3a88aaacfdabecfe06226db314d82d593b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-coreos-installer
 * [new ref]         8e300e3a88aaacfdabecfe06226db314d82d593b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e300e3 Backport patch that adds the F42 signing key