2 files changed, 129 insertions, 1 deletions
diff --git a/test/end-to-end/target-cache/TARGETS b/test/end-to-end/target-cache/TARGETS
index de7ba45b..ed8d75ff 100644
--- a/test/end-to-end/target-cache/TARGETS
+++ b/test/end-to-end/target-cache/TARGETS
@@ -4,6 +4,15 @@
   , "test": ["target-cache-hit.sh"]
   , "deps": [["test/end-to-end", "tool-under-test"], ["", "bin/just-mr.py"]]
   }
+, "artifacts-sync":
+  { "type": ["@", "rules", "shell/test", "script"]
+  , "name": ["artifacts-sync"]
+  , "test": ["artifacts-sync.sh"]
+  , "deps": [["test/end-to-end", "tool-under-test"], ["", "bin/just-mr.py"]]
+  }
 , "TESTS":
-  {"type": "install", "tainted": ["test"], "deps": ["target-cache-hit"]}
+  { "type": "install"
+  , "tainted": ["test"]
+  , "deps": ["target-cache-hit", "artifacts-sync"]
+  }
 }
diff --git a/test/end-to-end/target-cache/artifacts-sync.sh b/test/end-to-end/target-cache/artifacts-sync.sh
new file mode 100644
index 00000000..36e26761
--- /dev/null
+++ b/test/end-to-end/target-cache/artifacts-sync.sh
@@ -0,0 +1,119 @@
+#!/bin/sh
+
+set -eu
+
+# This test requires remote execution and is skipped in case of local execution.
+# The test is separated into two phases. In phase I, the execution IDs for the
+# local and the remote execution backends are determined. In phase II, the
+# actual test is executed, which is explained in the next section.
+
+# In order to test the synchronization of target-level cached remote artifacts
+# to the local CAS and back, the following test has been designed. The test
+# needs to verify that if any artifact that is mentioned in a target cache entry
+# is garbage collected on the remote side is actually uploaded by the
+# synchronization mechanism and will be available for remote action execution.
+# In order to "emulate" the behavior of a garbage collected file or tree on the
+# remote side, a simple project with parts eligible for target-level caching is
+# built locally and the target cache entry is pretended to be created for the
+# remote execution backend. If then remote execution is triggered, the files or
+# trees are not available on the remote side, so they need to be uploaded from
+# the local CAS. After the artifacts have been uploaded to the remote CAS, they
+# would be available for the next test run, thus, random strings are used in the
+# affected text files to vary the according hash value.
+
+readonly JUST="$PWD/bin/tool-under-test"
+readonly JUST_MR="$PWD/bin/just-mr.py"
+readonly LBRDIR="$TEST_TMPDIR/local-build-root"
+readonly TESTDIR="$TEST_TMPDIR/test-root"
+
+if [ "${REMOTE_EXECUTION_ADDRESS:-}" = "" ]; then
+  echo
+  echo "Test skipped, since no remote execution is specified."
+  echo
+else
+  REMOTE_EXECUTION_ARGS="-r $REMOTE_EXECUTION_ADDRESS"
+
+  if [ "${REMOTE_EXECUTION_PROPERTIES:-}" != "" ]; then
+    REMOTE_EXECUTION_ARGS="$REMOTE_EXECUTION_ARGS --remote-execution-property $REMOTE_EXECUTION_PROPERTIES"
+  fi
+
+  if [ "${COMPATIBLE:-}" = "YES" ]; then
+    ARGS="--compatible"
+    TCDIR="$LBRDIR/protocol-dependent/compatible-sha256/tc"
+  else
+    ARGS=""
+    TCDIR="$LBRDIR/protocol-dependent/git-sha1/tc"
+  fi
+
+  # create common test files
+  mkdir -p "$TESTDIR"
+  cd "$TESTDIR"
+  touch ROOT
+  cat > repos.json <<EOF
+{ "repositories":
+  { "main":
+    {"repository": {"type": "file", "path": ".", "pragma": {"to_git": true}}}
+  }
+}
+EOF
+
+  # ----------------------------------------------------------------------------
+  # Test Phase I
+  # ----------------------------------------------------------------------------
+
+  cat > TARGETS.p1 <<EOF
+{ "main": {"type": "export", "target": ["./", "main-target"]}
+, "main-target":
+  {"type": "generic", "cmds": ["echo foo > foo.txt"], "outs": ["foo.txt"]}
+}
+EOF
+
+  export CONF="$("$JUST_MR" -C repos.json --local-build-root="$LBRDIR" setup main)"
+
+  # determine local execution ID
+  "$JUST" build -C "$CONF" main --local-build-root="$LBRDIR" --target-file-name TARGETS.p1 $ARGS > /dev/null 2>&1
+  readonly LOCAL_EXECUTION_ID=$(ls "$TCDIR")
+  rm -rf "$TCDIR"
+
+  # determine remote execution ID
+  "$JUST" build -C "$CONF" main --local-build-root="$LBRDIR" --target-file-name TARGETS.p1 $ARGS $REMOTE_EXECUTION_ARGS > /dev/null 2>&1
+  readonly REMOTE_EXECUTION_ID=$(ls "$TCDIR")
+  rm -rf "$TCDIR"
+
+  # ----------------------------------------------------------------------------
+  # Test Phase II
+  # ----------------------------------------------------------------------------
+
+  # create random string: p<hostname>p<time[ns]>p<pid>p<random number[9 digits]>
+  readonly LOW=100000000
+  readonly HIGH=999999999
+  readonly RND="p$(hostname)p$(date +%s%N)p$$p$(shuf -i $LOW-$HIGH -n 1)"
+
+  cat > TARGETS.p2 <<EOF
+{ "main": {"type": "export", "target": ["./", "main-target"]}
+, "main-target":
+  { "type": "generic"
+  , "cmds": ["echo $RND | tee foo.txt out/bar.txt"]
+  , "outs": ["foo.txt"]
+  , "out_dirs": ["out"]
+  }
+}
+EOF
+
+  export CONF="$("$JUST_MR" -C repos.json --local-build-root="$LBRDIR" setup main)"
+
+  # build project locally
+  echo
+  echo "Build project locally"
+  echo
+  "$JUST" build -C "$CONF" main --local-build-root="$LBRDIR" --target-file-name TARGETS.p2 $ARGS 2>&1
+
+  # pretend target cache entry being created for remote execution backend
+  mv "$TCDIR/$LOCAL_EXECUTION_ID" "$TCDIR/$REMOTE_EXECUTION_ID"
+
+  # build project remotely
+  echo
+  echo "Build project remotely"
+  echo
+  "$JUST" build -C "$CONF" main --local-build-root="$LBRDIR" --target-file-name TARGETS.p2 $ARGS $REMOTE_EXECUTION_ARGS 2>&1
+fi