$ git clone -n https://src.fedoraproject.org/rpms/libgcrypt.git /var/lib/mock/f41-build-1178630-21860/root/chroot_tmpdir/scmroot/libgcrypt
Cloning into '/var/lib/mock/f41-build-1178630-21860/root/chroot_tmpdir/scmroot/libgcrypt'...
$ git fetch origin 186e09a1905735564fb294c64c24ab7883b218a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgcrypt
 * [new ref]         186e09a1905735564fb294c64c24ab7883b218a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 186e09a Unbreak s390x build