$ git clone -n https://src.fedoraproject.org/rpms/replacer.git /var/lib/mock/f40-build-2565622-62188/root/chroot_tmpdir/scmroot/replacer
Cloning into '/var/lib/mock/f40-build-2565622-62188/root/chroot_tmpdir/scmroot/replacer'...
$ git fetch origin ffc7fff52063cc657093cdc0421316c55ec568d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/replacer
 * [new ref]         ffc7fff52063cc657093cdc0421316c55ec568d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffc7fff Rebuilt for java-21-openjdk as system jdk