Update CMake code using KWSys to account for Status return values

KWSys as of 2021-04-14 changed the return type of `SystemTools`
operations from `bool` to `Status`.  Update our call sites.
This may improve error reporting accuracy in a few places.

Source/CPack/cmCPackSTGZGenerator.cxx

@@ -51,15 +51,16 @@ int cmCPackSTGZGenerator::PackageFiles()
    * so we must iterate over generated packages.
    */
   for (std::string const& pfn : this->packageFileNames) {
-    retval &= cmSystemTools::SetPermissions(pfn.c_str(),
+    retval &= static_cast<bool>(
+      cmSystemTools::SetPermissions(pfn.c_str(),
 #if defined(_MSC_VER) || defined(__MINGW32__)
                                     S_IREAD | S_IWRITE | S_IEXEC
 #else
-                                            S_IRUSR | S_IWUSR | S_IXUSR |
-                                              S_IRGRP | S_IWGRP | S_IXGRP |
-                                              S_IROTH | S_IWOTH | S_IXOTH
+                                    S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP |
+                                      S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH |
+                                      S_IXOTH
 #endif
-    );
+                                    ));
   }
   return retval;
 }

Source/CTest/cmCTestScriptHandler.cxx

@@ -921,7 +921,7 @@ bool cmCTestScriptHandler::TryToRemoveBinaryDirectoryOnce(
     }
   }
 
-  return cmSystemTools::RemoveADirectory(directoryPath);
+  return static_cast<bool>(cmSystemTools::RemoveADirectory(directoryPath));
 }
 
 cmDuration cmCTestScriptHandler::GetRemainingTimeAllowed()

Source/CTest/cmCTestTestHandler.cxx

@@ -1881,7 +1881,7 @@ void cmCTestTestHandler::ExpandTestsToRunInformationForRerunFailed()
   std::string dirName = this->CTest->GetBinaryDir() + "/Testing/Temporary";
 
   cmsys::Directory directory;
-  if (directory.Load(dirName) == 0) {
+  if (!directory.Load(dirName)) {
     cmCTestLog(this->CTest, ERROR_MESSAGE,
                "Unable to read the contents of " << dirName << std::endl);
     return;

Source/cmCTest.cxx

@@ -4,7 +4,6 @@
 
 #include <algorithm>
 #include <cctype>
-#include <cerrno>
 #include <chrono>
 #include <cstdio>
 #include <cstdlib>
@@ -2842,9 +2841,10 @@ int cmCTest::ExecuteTests()
       cmCTestLog(this, OUTPUT,
                  "Internal ctest changing into directory: " << workDir
                                                             << std::endl);
-      if (cmSystemTools::ChangeDirectory(workDir) != 0) {
+      cmsys::Status status = cmSystemTools::ChangeDirectory(workDir);
+      if (!status) {
         auto msg = "Failed to change working directory to \"" + workDir +
-          "\" : " + std::strerror(errno) + "\n";
+          "\" : " + status.GetString() + "\n";
         cmCTestLog(this, ERROR_MESSAGE, msg);
         return 1;
       }

Source/cmConditionEvaluator.cxx

@@ -654,10 +654,10 @@ bool cmConditionEvaluator::HandleLevel2(cmArgumentList& newArgs,
       if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
           this->IsKeyword(keyIS_NEWER_THAN, *argP1)) {
         int fileIsNewer = 0;
-        bool success = cmSystemTools::FileTimeCompare(
+        cmsys::Status ftcStatus = cmSystemTools::FileTimeCompare(
           arg->GetValue(), (argP2)->GetValue(), &fileIsNewer);
         this->HandleBinaryOp(
-          (!success || fileIsNewer == 1 || fileIsNewer == 0), reducible, arg,
+          (!ftcStatus || fileIsNewer == 1 || fileIsNewer == 0), reducible, arg,
           newArgs, argP1, argP2);
       }
 

Source/cmFileCommand.cxx

@@ -2956,9 +2956,12 @@ bool HandleCreateLinkCommand(std::vector<std::string> const& args,
 
   // Check if copy-on-error is enabled in the arguments.
   if (!completed && arguments.CopyOnError) {
-    completed = cmsys::SystemTools::CopyFileAlways(fileName, newFileName);
-    if (!completed) {
-      result = "Copy failed: " + cmSystemTools::GetLastSystemError();
+    cmsys::Status copied =
+      cmsys::SystemTools::CopyFileAlways(fileName, newFileName);
+    if (copied) {
+      completed = true;
+    } else {
+      result = "Copy failed: " + copied.GetString();
     }
   }
 

Source/cmQtAutoGenerator.cxx

@@ -116,7 +116,7 @@ bool cmQtAutoGenerator::MakeParentDirectory(std::string const& filename)
   bool success = true;
   std::string const dirName = cmSystemTools::GetFilenamePath(filename);
   if (!dirName.empty()) {
-    success = cmSystemTools::MakeDirectory(dirName);
+    success = static_cast<bool>(cmSystemTools::MakeDirectory(dirName));
   }
   return success;
 }

Source/cmSystemTools.cxx

@@ -1016,7 +1016,7 @@ cmSystemTools::CopyResult cmSystemTools::CopySingleFile(
   }
 
   mode_t perm = 0;
-  bool perms = SystemTools::GetPermissions(oldname, perm);
+  cmsys::Status perms = SystemTools::GetPermissions(oldname, perm);
 
   // If files are the same do not copy
   if (SystemTools::SameFile(oldname, newname)) {
@@ -3130,7 +3130,7 @@ bool cmSystemTools::RepeatedRemoveDirectory(const std::string& dir)
   }
   return false;
 #else
-  return cmSystemTools::RemoveADirectory(dir);
+  return static_cast<bool>(cmSystemTools::RemoveADirectory(dir));
 #endif
 }
 

Source/cmSystemTools.h

@@ -12,6 +12,7 @@
 #include <cm/string_view>
 
 #include "cmsys/Process.h"
+#include "cmsys/Status.hxx"      // IWYU pragma: export
 #include "cmsys/SystemTools.hxx" // IWYU pragma: export
 
 #include "cmCryptoHash.h"

Source/cmWorkingDirectory.cxx

@@ -19,7 +19,7 @@ cmWorkingDirectory::~cmWorkingDirectory()
 
 bool cmWorkingDirectory::SetDirectory(std::string const& newdir)
 {
-  if (cmSystemTools::ChangeDirectory(newdir) == 0) {
+  if (cmSystemTools::ChangeDirectory(newdir)) {
     this->ResultCode = 0;
     return true;
   }

Source/cmcmd.cxx

@@ -1635,7 +1635,7 @@ bool cmcmd::SymlinkInternal(std::string const& file, std::string const& link)
     cmSystemTools::RemoveFile(link);
   }
 #if defined(_WIN32) && !defined(__CYGWIN__)
-  return cmSystemTools::CopyFileAlways(file, link);
+  return static_cast<bool>(cmSystemTools::CopyFileAlways(file, link));
 #else
   std::string linktext = cmSystemTools::GetFilenameName(file);
   return cmSystemTools::CreateSymlink(linktext, link);

bootstrap

@@ -525,6 +525,7 @@ KWSYS_CXX_SOURCES="\
   FStream \
   Glob \
   RegularExpression \
+  Status \
   SystemTools"
 
 KWSYS_FILES="\
@@ -535,6 +536,7 @@ KWSYS_FILES="\
   Glob.hxx \
   Process.h \
   RegularExpression.hxx \
+  Status.hxx \
   String.h \
   String.hxx \
   System.h \