btd: Invalidate the graph if the buck deployment changes

Reviewed By: ndmitchell

Differential Revision: D55647381

fbshipit-source-id: 8eb09ba19ca5492fa36615307df474eafa92fd38

btd/src/buck/config.rs

@@ -9,6 +9,8 @@
 
 //! Configuration that we hardcode, because parsing it is too expensive.
 
+use crate::buck::types::CellPath;
+
 /// Certain bzl files should be excluded from transitive impact tracing.
 /// This list should *only* be extended if we are certain that changes to the file
 /// will have its impact traced through other means, e.g., attribute changes.
@@ -18,3 +20,22 @@ pub fn should_exclude_bzl_file_from_transitive_impact_tracing(path: &str) -> boo
             .iter()
             .any(|prefix| path.starts_with(*prefix))
 }
+
+pub fn is_buck_deployment(path: &CellPath) -> bool {
+    path.as_str().starts_with("fbsource//tools/buck2-versions/")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_is_buck_deployment() {
+        assert!(is_buck_deployment(&CellPath::new(
+            "fbsource//tools/buck2-versions/previous"
+        )));
+        assert!(is_buck_deployment(&CellPath::new(
+            "fbsource//tools/buck2-versions/stable"
+        )));
+    }
+}

btd/src/rerun.rs

@@ -12,6 +12,7 @@ use std::collections::HashSet;
 use std::path::Path;
 
 use crate::buck::cells::CellInfo;
+use crate::buck::config::is_buck_deployment;
 use crate::buck::package_resolver::PackageResolver;
 use crate::buck::targets::Targets;
 use crate::buck::types::CellName;
@@ -43,14 +44,18 @@ fn is_buckconfig(path: &CellPath) -> bool {
         || str.contains("/buckconfigs/")
 }
 
+fn invalidates_graph(path: &CellPath) -> bool {
+    is_buckconfig(path) || is_buck_deployment(path)
+}
+
 /// Compute the targets we should rerun, or None if we should do everything.
 pub fn rerun(
     cells: &CellInfo,
     base: &Targets,
     changes: &Changes,
 ) -> Option<HashMap<Package, PackageStatus>> {
     // if there are any .buckconfig changes, we should give up
-    if changes.cell_paths().any(is_buckconfig) {
+    if changes.cell_paths().any(invalidates_graph) {
         return None;
     }