$ git clone -n https://src.fedoraproject.org/rpms/rust-peg.git /var/lib/mock/f40-build-2101363-50499/root/chroot_tmpdir/scmroot/rust-peg
Cloning into '/var/lib/mock/f40-build-2101363-50499/root/chroot_tmpdir/scmroot/rust-peg'...
$ git fetch origin 0ea7ea651b294a5f442bf233b6769d1ab3358bce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg
 * [new ref]         0ea7ea651b294a5f442bf233b6769d1ab3358bce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ea7ea6 Update to version 0.8.1; Fixes RHBZ#1948227