$ git clone -n https://src.fedoraproject.org/rpms/rust-peg-macros.git /var/lib/mock/f38-build-side-43-rust-devel-1397762-31053/root/chroot_tmpdir/scmroot/rust-peg-macros
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397762-31053/root/chroot_tmpdir/scmroot/rust-peg-macros'...
$ git fetch origin 52cd63eea2516c2411359d926963d403dfd8e26f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg-macros
 * [new ref]         52cd63eea2516c2411359d926963d403dfd8e26f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52cd63e Update to version 0.8.1; Fixes RHBZ#1948228