$ git clone -n https://src.fedoraproject.org/rpms/libsodium.git /var/lib/mock/f39-build-1840950-41985/root/chroot_tmpdir/scmroot/libsodium
Cloning into '/var/lib/mock/f39-build-1840950-41985/root/chroot_tmpdir/scmroot/libsodium'...
$ git fetch origin 2d878b972a4766d880a81e744dbc365d51ac3234:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsodium
 * [new ref]         2d878b972a4766d880a81e744dbc365d51ac3234 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d878b9 Make mingw subpackages noarch