$ git clone -n https://src.fedoraproject.org/rpms/rust-subprocess.git /var/lib/mock/f40-build-2039882-48303/root/chroot_tmpdir/scmroot/rust-subprocess
Cloning into '/var/lib/mock/f40-build-2039882-48303/root/chroot_tmpdir/scmroot/rust-subprocess'...
$ git fetch origin 779a1d57d2618b69c7eccf41d409e5b55aa27fac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-subprocess
 * [new ref]         779a1d57d2618b69c7eccf41d409e5b55aa27fac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 779a1d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild