$ git clone -n https://src.fedoraproject.org/rpms/tcl-tkpng.git /var/lib/mock/f42-build-868772-176255/root/chroot_tmpdir/scmroot/tcl-tkpng
Cloning into '/var/lib/mock/f42-build-868772-176255/root/chroot_tmpdir/scmroot/tcl-tkpng'...
$ git fetch origin f09b403d1159d434ca7a7bd1269536a19a4c4793:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-tkpng
 * [new ref]         f09b403d1159d434ca7a7bd1269536a19a4c4793 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f09b403 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild