$ git clone -n https://src.fedoraproject.org/rpms/rust-filedescriptor.git /var/lib/mock/f40-build-2036356-48022/root/chroot_tmpdir/scmroot/rust-filedescriptor
Cloning into '/var/lib/mock/f40-build-2036356-48022/root/chroot_tmpdir/scmroot/rust-filedescriptor'...
$ git fetch origin 82c7988028895518a806f72cabeb602fa896790e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-filedescriptor
 * [new ref]         82c7988028895518a806f72cabeb602fa896790e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82c7988 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild