$ git clone -n https://src.fedoraproject.org/rpms/R-fastmatch /var/lib/mock/f39-build-1588055-38225/root/chroot_tmpdir/scmroot/R-fastmatch
Cloning into '/var/lib/mock/f39-build-1588055-38225/root/chroot_tmpdir/scmroot/R-fastmatch'...
$ git fetch origin b4cc0c463829ae104aff61d6e8548151c2ba87a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-fastmatch
 * [new ref]         b4cc0c463829ae104aff61d6e8548151c2ba87a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4cc0c4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild