$ git clone -n https://src.fedoraproject.org/rpms/jakarta-activation.git /var/lib/mock/f40-build-1643139-24171/root/chroot_tmpdir/scmroot/jakarta-activation
Cloning into '/var/lib/mock/f40-build-1643139-24171/root/chroot_tmpdir/scmroot/jakarta-activation'...
$ git fetch origin f72dcd88dc8852dae1da53788690cf6aa454775c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-activation
 * [new ref]         f72dcd88dc8852dae1da53788690cf6aa454775c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f72dcd8 Rebuilt for java-21-openjdk as system jdk