$ git clone -n https://src.fedoraproject.org/rpms/389-ds-base.git /var/lib/mock/f42-build-861896-170473/root/chroot_tmpdir/scmroot/389-ds-base
Cloning into '/var/lib/mock/f42-build-861896-170473/root/chroot_tmpdir/scmroot/389-ds-base'...
$ git fetch origin cc3b929de3e7dee73e7642d7bbf2b04418ef1ffe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/389-ds-base
 * [new ref]         cc3b929de3e7dee73e7642d7bbf2b04418ef1ffe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc3b929 Rebuild for ICU 76