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diff --git a/test/end-to-end/serve-service/serve-git-root/absent-upload.sh b/test/end-to-end/serve-service/serve-git-root/absent-upload.sh
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+#!/bin/sh
+# Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+###
+# This test checks that an absent root known in a local checkout can be
+# successfully uploaded to a serve endpoint. This can only succeed in native
+# mode.
+##
+
+set -eu
+
+readonly JUST="${PWD}/bin/tool-under-test"
+readonly JUST_MR="${PWD}/bin/mr-tool-under-test"
+readonly LOCAL_REPO="${TEST_TMPDIR}/repo_root"
+readonly LBR="${TEST_TMPDIR}/local-build-root"
+
+COMPAT=""
+if [ "${COMPATIBLE:-}" = "YES" ]; then
+  COMPAT="--compatible"
+fi
+
+ENDPOINT_ARGS="-r ${REMOTE_EXECUTION_ADDRESS} -R ${SERVE} ${COMPAT}"
+
+###
+# Setup sample repos config
+##
+
+mkdir -p "${LOCAL_REPO}"
+tar xf src.tar -C "${LOCAL_REPO}"
+
+cd "${LOCAL_REPO}"
+git init -b trunk
+git config user.name 'N.O.Body'
+git config user.email 'nobody@example.org'
+git add -f .
+git commit -m 'Test repo' 2>&1
+COMMIT=$(git log -n 1 --format="%H")
+SUBTREE=$(git ls-tree "$COMMIT" repo | awk '{print $3}')
+cd -
+
+mkdir work
+cd work
+
+touch ROOT
+cat > repos.json <<EOF
+{ "repositories":
+  { "main":
+    { "repository":
+      { "type": "git"
+      , "commit": "$COMMIT"
+      , "repository": "${LOCAL_REPO}"
+      , "branch": "trunk"
+      , "subdir": "repo"
+      , "pragma": {"absent": true}
+      }
+    }
+  }
+}
+EOF
+
+###
+# Run the checks
+##
+
+# Setup an absent root from a local checkout. For a serve endpoint that does
+# not have the commit available, this will upload the locally-known root tree
+# to remote CAS, from where the serve endpoint will pick it up. This requires
+# that the remotes are in native mode.
+if [ -z "${COMPAT}" ]; then
+
+  CONF=$("${JUST_MR}" --norc -C repos.json \
+                      --just "${JUST}" \
+                      --local-build-root "${LBR}" \
+                      --log-limit 6 \
+                      ${ENDPOINT_ARGS} setup main)
+  cat "${CONF}"
+  echo
+  test $(jq -r '.repositories.main.workspace_root[1]' "${CONF}") = "${SUBTREE}"
+
+else
+
+  echo ---
+  echo Checking expected failures
+
+  "${JUST_MR}" --norc -C repos.json \
+               --just "${JUST}" \
+               --local-build-root "${LBR}" \
+               --log-limit 6 \
+               ${ENDPOINT_ARGS} setup main 2>&1 && exit 1 || :
+  echo Failed as expected
+fi
+
+echo OK