$ git clone -n https://src.fedoraproject.org/rpms/pkgtreediff.git /var/lib/mock/f42-build-878684-181207/root/chroot_tmpdir/scmroot/pkgtreediff
Cloning into '/var/lib/mock/f42-build-878684-181207/root/chroot_tmpdir/scmroot/pkgtreediff'...
$ git fetch origin 990298f0f79bf46f51308cb716b54901c48d8776:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pkgtreediff
 * [new ref]         990298f0f79bf46f51308cb716b54901c48d8776 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 990298f Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild