$ git clone -n https://src.fedoraproject.org/rpms/icu.git /var/lib/mock/f42-build-861856-170458/root/chroot_tmpdir/scmroot/icu
Cloning into '/var/lib/mock/f42-build-861856-170458/root/chroot_tmpdir/scmroot/icu'...
$ git fetch origin 12d01762b2558fa4b07ac6207792d95168e5ef7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icu
 * [new ref]         12d01762b2558fa4b07ac6207792d95168e5ef7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12d0176 Update to 76.1