https://git.ruby-lang.org/ruby.git/commit/?id=799c5766a4

From 799c5766a4dc215d139d2c26ac68636f43a64fbf Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@r...>
Date: Sat, 27 Jun 2020 12:29:42 +0900
Subject: merge revision(s) a19228f878d955eaf2cce086bcf53f46fdf894b9: [Backport
 #16979]

	brace the fact that lchmod(2) can EOPNOTSUPP

	Musl libc has this function as a tiny wrapper of fchmodat(3posix).  On
	the other hand Linux kernel does not support changing modes of a symlink.
	The operation always fails with EOPNOTSUPP.  This fchmodat behaviour is
	defined in POSIX.  We have to take care of such exceptions.

diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index a7ad65a..04788e2 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -1345,6 +1345,7 @@ module FileUtils https://github.com/ruby/ruby/blob/trunk/lib/fileutils.rb#L1345
       else
         File.chmod mode, path()
       end
+    rescue Errno::EOPNOTSUPP
     end
 
     def chown(uid, gid)
@@ -1439,7 +1440,7 @@ module FileUtils https://github.com/ruby/ruby/blob/trunk/lib/fileutils.rb#L1440
       if st.symlink?
         begin
           File.lchmod mode, path
-        rescue NotImplementedError
+        rescue NotImplementedError, Errno::EOPNOTSUPP
         end
       else
         File.chmod mode, path
diff --git a/test/pathname/test_pathname.rb b/test/pathname/test_pathname.rb
index 792510b..2ce32a6 100644
--- a/test/pathname/test_pathname.rb
+++ b/test/pathname/test_pathname.rb
@@ -818,7 +818,7 @@ class TestPathname < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/pathname/test_pathname.rb#L818
       old = path.lstat.mode
       begin
         path.lchmod(0444)
-      rescue NotImplementedError
+      rescue NotImplementedError, Errno::EOPNOTSUPP
         next
       end
       assert_equal(0444, path.lstat.mode & 0777)
diff --git a/test/ruby/test_notimp.rb b/test/ruby/test_notimp.rb
index b069154..e13db69 100644
--- a/test/ruby/test_notimp.rb
+++ b/test/ruby/test_notimp.rb
@@ -13,11 +13,11 @@ class TestNotImplement < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_notimp.rb#L13
 
   def test_respond_to_lchmod
     assert_include(File.methods, :lchmod)
-    if /linux/ =~ RUBY_PLATFORM
-      assert_equal(false, File.respond_to?(:lchmod))
-    end
-    if /freebsd/ =~ RUBY_PLATFORM
+    case RUBY_PLATFORM
+    when /freebsd/, /linux-musl/
       assert_equal(true, File.respond_to?(:lchmod))
+    when /linux/
+      assert_equal(false, File.respond_to?(:lchmod))
     end
   end
 
@@ -57,9 +57,14 @@ class TestNotImplement < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_notimp.rb#L57
         File.open(f, "w") {}
         File.symlink f, g
         newmode = 0444
-        File.lchmod newmode, "#{d}/g"
-        snew = File.lstat(g)
-        assert_equal(newmode, snew.mode & 0777)
+        begin
+          File.lchmod newmode, "#{d}/g"
+        rescue Errno::EOPNOTSUPP
+          skip $!
+        else
+          snew = File.lstat(g)
+          assert_equal(newmode, snew.mode & 0777)
+        end
       }
     end
   end
diff --git a/version.h b/version.h
index 725fab3..248fdbe 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L2
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 1
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 86
+#define RUBY_PATCHLEVEL 87
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 6
-- 
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