$ git clone -n https://src.fedoraproject.org/rpms/rust-peg-runtime.git /var/lib/mock/f40-build-2250987-54100/root/chroot_tmpdir/scmroot/rust-peg-runtime
Cloning into '/var/lib/mock/f40-build-2250987-54100/root/chroot_tmpdir/scmroot/rust-peg-runtime'...
$ git fetch origin d948624082c1bde9ddfc7b5d2f0c0e7111b48461:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg-runtime
 * [new ref]         d948624082c1bde9ddfc7b5d2f0c0e7111b48461 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d948624 Update to version 0.8.2; Fixes RHBZ#2243161