$ git clone -n https://src.fedoraproject.org/rpms/gr-air-modes.git /var/lib/mock/f39-build-1764635-41501/root/chroot_tmpdir/scmroot/gr-air-modes
Cloning into '/var/lib/mock/f39-build-1764635-41501/root/chroot_tmpdir/scmroot/gr-air-modes'...
$ git fetch origin ed474b8e9fcc08035dc67d751725ec60ff9b2a37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gr-air-modes
 * [new ref]         ed474b8e9fcc08035dc67d751725ec60ff9b2a37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed474b8 Drop commented-out BuildRequires on mpir-devel, which is retired