$ git clone -n https://src.fedoraproject.org/rpms/jakarta-activation1.git /var/lib/mock/f40-build-2709758-71641/root/chroot_tmpdir/scmroot/jakarta-activation1
Cloning into '/var/lib/mock/f40-build-2709758-71641/root/chroot_tmpdir/scmroot/jakarta-activation1'...
$ git fetch origin 5db61491c0df82a0414cdcc3f17751be3dd5c9b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-activation1
 * [new ref]         5db61491c0df82a0414cdcc3f17751be3dd5c9b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5db6149 Rebuilt for java-21-openjdk as system jdk