$ git clone -n https://src.fedoraproject.org/rpms/rust-signal.git /var/lib/mock/f41-build-side-1-3134922-39764/root/chroot_tmpdir/scmroot/rust-signal
Cloning into '/var/lib/mock/f41-build-side-1-3134922-39764/root/chroot_tmpdir/scmroot/rust-signal'...
$ git fetch origin 10fd00c8a5da91bc627f1b4512552c004b930c35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-signal
 * [new ref]         10fd00c8a5da91bc627f1b4512552c004b930c35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10fd00c unused leaf package for more than two release cycles