$ git clone -n https://src.fedoraproject.org/rpms/blosc2.git /var/lib/mock/f39-build-1602150-38565/root/chroot_tmpdir/scmroot/blosc2
Cloning into '/var/lib/mock/f39-build-1602150-38565/root/chroot_tmpdir/scmroot/blosc2'...
$ git fetch origin 6e6830c7fe204b5edec0123b8abe39a2cec2c2f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blosc2
 * [new ref]         6e6830c7fe204b5edec0123b8abe39a2cec2c2f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e6830c Add cmake files to file list