$ git clone -n https://src.fedoraproject.org/rpms/libdecor.git /var/lib/mock/f39-build-1457227-32971/root/chroot_tmpdir/scmroot/libdecor
Cloning into '/var/lib/mock/f39-build-1457227-32971/root/chroot_tmpdir/scmroot/libdecor'...
$ git fetch origin bbb9a270dfadf2cc69c3f2957c2f5a3fc98fc2dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdecor
 * [new ref]         bbb9a270dfadf2cc69c3f2957c2f5a3fc98fc2dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbb9a27 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild