[llvm-install-name-tool] Error on non-Mach-O binaries (#90351)

Previously if you passed an ELF binary it would be silently copied with no changes.

llvm/test/tools/llvm-objcopy/MachO/install-name-tool.test

@@ -0,0 +1,19 @@
+## This test checks general llvm-install-name-tool behavior.
+
+# RUN: yaml2obj %s -o %t
+
+## Passing something that doesn't exist
+# RUN: not llvm-install-name-tool -add_rpath foo non-existent-binary 2>&1 | FileCheck %s --check-prefix=DOES_NOT_EXIST
+
+# DOES_NOT_EXIST: {{.*}}non-existent-binary
+
+## Passing a non-Mach-O binary
+# RUN: not llvm-install-name-tool -add_rpath foo %t 2>&1 | FileCheck %s --check-prefix=NON_MACH_O -DFILE=%t
+
+# NON_MACH_O: error: input file: [[FILE]] is not a Mach-O file
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC

llvm/tools/llvm-objcopy/ObjcopyOptions.cpp

@@ -15,6 +15,7 @@
 #include "llvm/ObjCopy/CommonConfig.h"
 #include "llvm/ObjCopy/ConfigManager.h"
 #include "llvm/ObjCopy/MachO/MachOConfig.h"
+#include "llvm/Object/Binary.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/CRC.h"
@@ -26,6 +27,7 @@
 
 using namespace llvm;
 using namespace llvm::objcopy;
+using namespace llvm::object;
 using namespace llvm::opt;
 
 namespace {
@@ -1242,6 +1244,16 @@ objcopy::parseInstallNameToolOptions(ArrayRef<const char *> ArgsArr) {
   Config.InputFilename = Positional[0];
   Config.OutputFilename = Positional[0];
 
+  Expected<OwningBinary<Binary>> BinaryOrErr =
+      createBinary(Config.InputFilename);
+  if (!BinaryOrErr)
+    return createFileError(Config.InputFilename, BinaryOrErr.takeError());
+  auto *Binary = (*BinaryOrErr).getBinary();
+  if (!Binary->isMachO() && !Binary->isMachOUniversalBinary())
+    return createStringError(errc::invalid_argument,
+                             "input file: %s is not a Mach-O file",
+                             Config.InputFilename.str().c_str());
+
   DC.CopyConfigs.push_back(std::move(ConfigMgr));
   return std::move(DC);
 }