$ git clone -n https://src.fedoraproject.org/rpms/rust-peg0.6.git /var/lib/mock/f39-build-1586577-38204/root/chroot_tmpdir/scmroot/rust-peg0.6
Cloning into '/var/lib/mock/f39-build-1586577-38204/root/chroot_tmpdir/scmroot/rust-peg0.6'...
$ git fetch origin 74daf3fbac00d6259c2eb65455f4c517b9e27db8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg0.6
 * [new ref]         74daf3fbac00d6259c2eb65455f4c517b9e27db8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74daf3f Initial import (peg 0.6 compat package)