Remove files that should no longer be installed
Make now exports (partial) lists of what should be installed. Those
lists are incomplete, but if something is removed from the list, we can
remove it from the filesystem so that incremental builds work better.
Test: built-in tests (m blueprint_tools)
Test: remove a module from PRODUCT_PACKAGES, see the print and file removed
Test: change the name of a cts test, see the old one removed from cts
Change-Id: I6bc14c6a5af63383ea265e97ed8b875fa51af0ed
diff --git a/ui/build/cleanbuild.go b/ui/build/cleanbuild.go
index 0b44b4d..1c4f574 100644
--- a/ui/build/cleanbuild.go
+++ b/ui/build/cleanbuild.go
@@ -15,10 +15,12 @@
package build
import (
+ "bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
+ "sort"
"strings"
"android/soong/ui/metrics"
@@ -177,3 +179,78 @@
writeConfig()
}
+
+// cleanOldFiles takes an input file (with all paths relative to basePath), and removes files from
+// the filesystem if they were removed from the input file since the last execution.
+func cleanOldFiles(ctx Context, basePath, file string) {
+ file = filepath.Join(basePath, file)
+ oldFile := file + ".previous"
+
+ if _, err := os.Stat(file); err != nil {
+ ctx.Fatalf("Expected %q to be readable", file)
+ }
+
+ if _, err := os.Stat(oldFile); os.IsNotExist(err) {
+ if err := os.Rename(file, oldFile); err != nil {
+ ctx.Fatalf("Failed to rename file list (%q->%q): %v", file, oldFile, err)
+ }
+ return
+ }
+
+ var newPaths, oldPaths []string
+ if newData, err := ioutil.ReadFile(file); err == nil {
+ if oldData, err := ioutil.ReadFile(oldFile); err == nil {
+ // Common case: nothing has changed
+ if bytes.Equal(newData, oldData) {
+ return
+ }
+ newPaths = strings.Fields(string(newData))
+ oldPaths = strings.Fields(string(oldData))
+ } else {
+ ctx.Fatalf("Failed to read list of installable files (%q): %v", oldFile, err)
+ }
+ } else {
+ ctx.Fatalf("Failed to read list of installable files (%q): %v", file, err)
+ }
+
+ // These should be mostly sorted by make already, but better make sure Go concurs
+ sort.Strings(newPaths)
+ sort.Strings(oldPaths)
+
+ for len(oldPaths) > 0 {
+ if len(newPaths) > 0 {
+ if oldPaths[0] == newPaths[0] {
+ // Same file; continue
+ newPaths = newPaths[1:]
+ oldPaths = oldPaths[1:]
+ continue
+ } else if oldPaths[0] > newPaths[0] {
+ // New file; ignore
+ newPaths = newPaths[1:]
+ continue
+ }
+ }
+ // File only exists in the old list; remove if it exists
+ old := filepath.Join(basePath, oldPaths[0])
+ oldPaths = oldPaths[1:]
+ if fi, err := os.Stat(old); err == nil {
+ if fi.IsDir() {
+ if err := os.Remove(old); err == nil {
+ ctx.Println("Removed directory that is no longer installed: ", old)
+ } else {
+ ctx.Println("Failed to remove directory that is no longer installed (%q): %v", old, err)
+ ctx.Println("It's recommended to run `m installclean`")
+ }
+ } else {
+ if err := os.Remove(old); err == nil {
+ ctx.Println("Removed file that is no longer installed: ", old)
+ } else if !os.IsNotExist(err) {
+ ctx.Fatalf("Failed to remove file that is no longer installed (%q): %v", old, err)
+ }
+ }
+ }
+ }
+
+ // Use the new list as the base for the next build
+ os.Rename(file, oldFile)
+}