$ git clone -n https://src.fedoraproject.org/rpms/widevine-installer.git /var/lib/mock/f40-build-760390-121097/root/chroot_tmpdir/scmroot/widevine-installer
Cloning into '/var/lib/mock/f40-build-760390-121097/root/chroot_tmpdir/scmroot/widevine-installer'...
$ git fetch origin c71617f1497fef82cfd0b4f8658b06ca33f72ca1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/widevine-installer
 * [new ref]         c71617f1497fef82cfd0b4f8658b06ca33f72ca1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c71617f Use environment.d instead of the bash profile; Fixes: RHBZ#2250529