Support, LTO: When pruning a directory, ignore files matching a prefix.
This is a safeguard against data loss if the user specifies a directory
that is not a cache directory. Teach the existing cache pruning clients
to create files with appropriate names.
Differential Revision: https://reviews.llvm.org/D31109
llvm-svn: 298271
diff --git a/llvm/lib/Support/CachePruning.cpp b/llvm/lib/Support/CachePruning.cpp
index 5d81e10..aca1236 100644
--- a/llvm/lib/Support/CachePruning.cpp
+++ b/llvm/lib/Support/CachePruning.cpp
@@ -180,8 +180,11 @@
// Walk all of the files within this directory.
for (sys::fs::directory_iterator File(CachePathNative, EC), FileEnd;
File != FileEnd && !EC; File.increment(EC)) {
- // Do not touch the timestamp.
- if (File->path() == TimestampFile)
+ // Ignore any files not beginning with the string "llvmcache-". This
+ // includes the timestamp file as well as any files created by the user.
+ // This acts as a safeguard against data loss if the user specifies the
+ // wrong directory as their cache directory.
+ if (!sys::path::filename(File->path()).startswith("llvmcache-"))
continue;
// Look at this file. If we can't stat it, there's nothing interesting