Add test that also for trees in the git cas we can follow paths

For a user `just install-cas` will show an entry without revealing
where it found it---as it is content-addressable, it does not matter.
Therefore, verify that accessing paths of a tree object also works
regardless of where the tree is stored.

2 files changed, 85 insertions, 1 deletions

diff --git a/test/end-to-end/cli/TARGETS b/test/end-to-end/cli/TARGETS
index 17e76c22..ae96d466 100644
--- a/test/end-to-end/cli/TARGETS
+++ b/test/end-to-end/cli/TARGETS
@@ -28,6 +28,13 @@
   , "test": ["build-p.sh"]
   , "deps": [["end-to-end", "tool-under-test"]]
   }
+, "git cas -P":
+  { "type": ["@", "rules", "shell/test", "script"]
+  , "name": ["git-cas-P"]
+  , "test": ["git-cas-p.sh"]
+  , "deps":
+    [["end-to-end", "tool-under-test"], ["end-to-end", "mr-tool-under-test"]]
+  }
 , "just-mr reporting":
   { "type": ["@", "rules", "shell/test", "script"]
   , "name": ["just-mr-reporting"]
@@ -43,7 +50,7 @@
   , "deps":
     { "type": "++"
     , "$1":
-      [ ["defaults", "pwd", "install", "build -P", "analyse"]
+      [ ["defaults", "pwd", "install", "build -P", "analyse", "git cas -P"]
       , { "type": "if"
         , "cond": {"type": "var", "name": "TEST_BOOTSTRAP_JUST_MR"}
         , "then": []
diff --git a/test/end-to-end/cli/git-cas-p.sh b/test/end-to-end/cli/git-cas-p.sh
new file mode 100644
index 00000000..decd4547
--- /dev/null
+++ b/test/end-to-end/cli/git-cas-p.sh
@@ -0,0 +1,77 @@
+#!/bin/sh
+# Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+set -e
+
+ROOT="$(pwd)"
+JUST="${ROOT}/bin/tool-under-test"
+JUST_MR="${ROOT}/bin/mr-tool-under-test"
+BUILDROOT="${TEST_TMPDIR}/build-root"
+DISTDIR="${TEST_TMPDIR}/distfiles"
+mkdir -p "${DISTDIR}"
+
+
+# Create an archive
+mkdir -p src/with/some/deep/directory
+echo 'Hello World' > src/with/some/deep/directory/hello.txt
+tar cvf "${DISTDIR}/src.tar" src
+rm -rf src
+HASH=$(git hash-object "${DISTDIR}/src.tar")
+
+echo
+echo archive has content $HASH
+echo
+
+# Set up a build root from that archive
+mkdir work
+cd work
+touch ROOT
+cat > repos.json <<EOF
+{ "repositories":
+  { "":
+    { "repository":
+      { "type": "archive"
+      , "content": "${HASH}"
+      , "fetch": "http://example.com/src.tar"
+      , "subdir": "src/with"
+      }
+    }
+  }
+}
+EOF
+cat repos.json
+echo
+"${JUST_MR}" --norc --local-build-root "${BUILDROOT}" \
+             --distdir "${DISTDIR}" setup > CONF
+echo
+cat CONF
+echo
+cat $(cat CONF)
+echo
+TREE=$(jq -rM '.repositories."".workspace_root[1]' $(cat CONF))
+echo
+echo Tree is ${TREE}
+echo
+
+# Verify that we can obtain this tree, as well as its parts
+"${JUST}" install-cas --local-build-root "${BUILDROOT}" "${TREE}::t"
+"${JUST}" install-cas --local-build-root "${BUILDROOT}" "${TREE}::t" -P some
+"${JUST}" install-cas --local-build-root "${BUILDROOT}" "${TREE}::t" -P some/deep
+"${JUST}" install-cas --local-build-root "${BUILDROOT}" "${TREE}::t" -P some/deep/directory
+"${JUST}" install-cas --local-build-root "${BUILDROOT}" "${TREE}::t" -P some/deep/directory/hello.txt
+"${JUST}" install-cas --local-build-root "${BUILDROOT}" "${TREE}::t" -P some/deep/directory/hello.txt -o hello.txt
+grep World hello.txt
+
+echo
+echo OK