$ git clone -n https://src.fedoraproject.org/rpms/wkhtmltopdf.git /var/lib/mock/f45-build-38410-724/root/chroot_tmpdir/scmroot/wkhtmltopdf
Cloning into '/var/lib/mock/f45-build-38410-724/root/chroot_tmpdir/scmroot/wkhtmltopdf'...
$ git fetch origin 5d540e5a45ef33874b4bce07605ac7f9a133055c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wkhtmltopdf
 * [new ref]         5d540e5a45ef33874b4bce07605ac7f9a133055c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  33% (1/3)
Updating files:  66% (2/3)
Updating files: 100% (3/3)
Updating files: 100% (3/3), done.
HEAD is now at 5d540e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild