$ git clone -n https://src.fedoraproject.org/rpms/pdfmixtool.git /var/lib/mock/f40-build-798221-141764/root/chroot_tmpdir/scmroot/pdfmixtool
Cloning into '/var/lib/mock/f40-build-798221-141764/root/chroot_tmpdir/scmroot/pdfmixtool'...
$ git fetch origin 1ab75151160e6e05aa3d80a2c687f40e75088c93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdfmixtool
 * [new ref]         1ab75151160e6e05aa3d80a2c687f40e75088c93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ab7515 Fix FTBFS (rhbz#2261443)