Revert "Revert "Modify symlink_forest to rerun when soong_build has changed.""
This reverts commit aa5cc2cd6af5da7c65914500fc6e11c6a130060c.
Reason for revert: Fixed the bug in the original draft.
There was an error in how we compared the file's MTime to the
file's contents.
Bug: 300288299
Test: presubmits
Test: build/soong/tests/run_integration_tests.sh
Change-Id: I9e53432c0842c0b9fc13fe20d30ce9af37640c7f
diff --git a/tests/symlink_forest_rerun_test.sh b/tests/symlink_forest_rerun_test.sh
new file mode 100755
index 0000000..74e779e
--- /dev/null
+++ b/tests/symlink_forest_rerun_test.sh
@@ -0,0 +1,43 @@
+#!/bin/bash -eu
+
+set -o pipefail
+
+# Tests that symlink forest will replant if soong_build has changed
+# Any change to the build system should trigger a rerun
+
+source "$(dirname "$0")/lib.sh"
+
+function test_symlink_forest_reruns {
+ setup
+
+ mkdir -p a
+ touch a/g.txt
+ cat > a/Android.bp <<'EOF'
+filegroup {
+ name: "g",
+ srcs: ["g.txt"],
+ }
+EOF
+
+ run_soong g
+
+ mtime=`cat out/soong/workspace/soong_build_mtime`
+ # rerun with no changes - ensure that it hasn't changed
+ run_soong g
+ newmtime=`cat out/soong/workspace/soong_build_mtime`
+ if [[ ! "$mtime" == "$mtime" ]]; then
+ fail "symlink forest reran when it shouldn't have"
+ fi
+
+ # change exit codes to force a soong_build rebuild.
+ sed -i 's/os.Exit(1)/os.Exit(2)/g' build/soong/bp2build/symlink_forest.go
+
+ run_soong g
+ newmtime=`cat out/soong/workspace/soong_build_mtime`
+ if [[ "$mtime" == "$newmtime" ]]; then
+ fail "symlink forest did not rerun when it should have"
+ fi
+
+}
+
+scan_and_run_tests