$ git clone -n https://src.fedoraproject.org/rpms/rust-peg-macros.git /var/lib/mock/f45-build-43766-805/root/chroot_tmpdir/scmroot/rust-peg-macros
Cloning into '/var/lib/mock/f45-build-43766-805/root/chroot_tmpdir/scmroot/rust-peg-macros'...
$ git fetch origin a8c74c6ab0c244cde065162f397c29a6c4886f13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-peg-macros
 * [new ref]         a8c74c6ab0c244cde065162f397c29a6c4886f13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8c74c6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild