$ git clone -n https://src.fedoraproject.org/rpms/dirgra.git /var/lib/mock/f40-build-2504217-61700/root/chroot_tmpdir/scmroot/dirgra
Cloning into '/var/lib/mock/f40-build-2504217-61700/root/chroot_tmpdir/scmroot/dirgra'...
$ git fetch origin 3bccb17fff51514a89049dafb5afb2712df081a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dirgra
 * [new ref]         3bccb17fff51514a89049dafb5afb2712df081a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bccb17 Rebuilt for java-21-openjdk as system jdk