$ git clone -n https://src.fedoraproject.org/rpms/jakarta-activation1.git /var/lib/mock/f40-build-2227128-53001/root/chroot_tmpdir/scmroot/jakarta-activation1
Cloning into '/var/lib/mock/f40-build-2227128-53001/root/chroot_tmpdir/scmroot/jakarta-activation1'...
$ git fetch origin 2c1acf9b05bc8facaf255e41034ce154c05bc3f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-activation1
 * [new ref]         2c1acf9b05bc8facaf255e41034ce154c05bc3f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c1acf9 Update javapackages test plan to f40