$ git clone -n https://src.fedoraproject.org/rpms/geary.git /var/lib/mock/f40-build-2664826-67076/root/chroot_tmpdir/scmroot/geary
Cloning into '/var/lib/mock/f40-build-2664826-67076/root/chroot_tmpdir/scmroot/geary'...
$ git fetch origin 700b749df96e01b90f2e7185f4947344605bf207:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/geary
 * [new ref]         700b749df96e01b90f2e7185f4947344605bf207 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 700b749 Rebuild for ICU 74