$ git clone -n https://src.fedoraproject.org/rpms/kchmviewer.git /var/lib/mock/f42-build-3384219-45084/root/chroot_tmpdir/scmroot/kchmviewer
Cloning into '/var/lib/mock/f42-build-3384219-45084/root/chroot_tmpdir/scmroot/kchmviewer'...
$ git fetch origin 094aa81a9b701fb909add9a4ecba81c0b3605a2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kchmviewer
 * [new ref]         094aa81a9b701fb909add9a4ecba81c0b3605a2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 094aa81 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild