From f69c91780fbb0e9c0e95f70a079f578efdca0bfa Mon Sep 17 00:00:00 2001
From: Jan Korous <jkorous@apple.com>
Date: Fri, 13 Sep 2019 20:08:27 +0000
Subject: [Support] Add overload writeFileAtomically(std::function Writer)

Differential Revision: https://reviews.llvm.org/D67424

llvm-svn: 371890
---
 llvm/lib/Support/FileUtilities.cpp | 63 ++++++++++++++++++++++++++++----------
 1 file changed, 47 insertions(+), 16 deletions(-)

(limited to 'llvm/lib/Support/FileUtilities.cpp')

diff --git a/llvm/lib/Support/FileUtilities.cpp b/llvm/lib/Support/FileUtilities.cpp
index b933692..d11fbb5 100644
--- a/llvm/lib/Support/FileUtilities.cpp
+++ b/llvm/lib/Support/FileUtilities.cpp
@@ -12,7 +12,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/FileUtilities.h"
+#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -266,36 +268,65 @@ int llvm::DiffFilesWithTolerance(StringRef NameA,
   return CompareFailed;
 }
 
-Error llvm::writeFileAtomically(StringRef TempPathModel, StringRef FinalPath,
-                                StringRef Buffer) {
+void llvm::AtomicFileWriteError::log(raw_ostream &OS) const {
+  OS << "atomic_write_error: ";
+  switch (Error) {
+  case atomic_write_error::failed_to_create_uniq_file:
+    OS << "failed_to_create_uniq_file";
+    return;
+  case atomic_write_error::output_stream_error:
+    OS << "output_stream_error";
+    return;
+  case atomic_write_error::failed_to_rename_temp_file:
+    OS << "failed_to_rename_temp_file";
+    return;
+  }
+  llvm_unreachable("unknown atomic_write_error value in "
+                   "failed_to_rename_temp_file::log()");
+}
+
+llvm::Error llvm::writeFileAtomically(StringRef TempPathModel,
+                                      StringRef FinalPath, StringRef Buffer) {
+  return writeFileAtomically(TempPathModel, FinalPath,
+                             [&Buffer](llvm::raw_ostream &OS) {
+                               OS.write(Buffer.data(), Buffer.size());
+                               return llvm::Error::success();
+                             });
+}
+
+llvm::Error llvm::writeFileAtomically(
+    StringRef TempPathModel, StringRef FinalPath,
+    std::function<llvm::Error(llvm::raw_ostream &)> Writer) {
   SmallString<128> GeneratedUniqPath;
   int TempFD;
-  if (const std::error_code Error = sys::fs::createUniqueFile(
-          TempPathModel.str(), TempFD, GeneratedUniqPath)) {
-    return createStringError(
-        Error, "failed to create temporary file with model \"%s\"",
-        TempPathModel.str().c_str());
+  if (sys::fs::createUniqueFile(TempPathModel.str(), TempFD,
+                                GeneratedUniqPath)) {
+    return llvm::make_error<AtomicFileWriteError>(
+        atomic_write_error::failed_to_create_uniq_file);
   }
+  llvm::FileRemover RemoveTmpFileOnFail(GeneratedUniqPath);
 
   raw_fd_ostream OS(TempFD, /*shouldClose=*/true);
-  OS.write(Buffer.data(), Buffer.size());
-  OS.close();
-  TempFD = -1;
+  if (llvm::Error Err = Writer(OS)) {
+    return Err;
+  }
 
+  OS.close();
   if (OS.has_error()) {
-    const std::error_code Error = OS.error();
     OS.clear_error();
-    return createStringError(Error, "failed to write to \"%s\"",
-                             GeneratedUniqPath.c_str());
+    return llvm::make_error<AtomicFileWriteError>(
+        atomic_write_error::output_stream_error);
   }
 
   if (const std::error_code Error =
           sys::fs::rename(/*from=*/GeneratedUniqPath.c_str(),
                           /*to=*/FinalPath.str().c_str())) {
-    return createStringError(Error, "failed to rename file \"%s\" to \"%s\"",
-                             GeneratedUniqPath.c_str(),
-                             FinalPath.str().c_str());
+    return llvm::make_error<AtomicFileWriteError>(
+        atomic_write_error::failed_to_rename_temp_file);
   }
 
+  RemoveTmpFileOnFail.releaseFile();
   return Error::success();
 }
+
+char llvm::AtomicFileWriteError::ID;
-- 
cgit v1.1