$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-krb5.git /var/lib/mock/f42-build-862752-171084/root/chroot_tmpdir/scmroot/php-pecl-krb5
Cloning into '/var/lib/mock/f42-build-862752-171084/root/chroot_tmpdir/scmroot/php-pecl-krb5'...
$ git fetch origin c76e772cde2d48b2d362228639a9a270059a1572:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-krb5
 * [new ref]         c76e772cde2d48b2d362228639a9a270059a1572 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c76e772 modernize the spec file