shell fallback get_owner

Author: scivision

+stdlib/+python/get_owner.m

@@ -1,5 +1,10 @@
 function n = get_owner(p)
 
-n = string(py.str(py.pathlib.Path(p).owner()));
+try
+  n = string(py.str(py.pathlib.Path(p).owner()));
+catch e
+  warning(e.identifier, "get_owner(%s) failed: %s", p, e.message);
+  n = string.empty;
+end
 
 end

+stdlib/+sys/get_owner.m

@@ -0,0 +1,18 @@
+function o = get_owner(p)
+
+o = string.empty;
+
+if ispc()
+  cmd = "pwsh -c (Get-Acl -Path '" + p + "').Owner";
+elseif ismac()
+  cmd = "stat -f %Su " + p;
+else
+  cmd = "stat -c %U " + p;
+end
+
+[s, o] = system(cmd);
+if s == 0
+  o = strip(o);
+end
+
+end

+stdlib/get_owner.m

@@ -28,6 +28,10 @@
 
 end
 
+if strempty(n)
+  n = stdlib.sys.get_owner(p);
+end
+
 end
 
 %!assert(!isempty(get_owner(pwd)))

test/TestDisk.m

@@ -73,14 +73,12 @@ function test_device(tc)
 
 
 function test_inode(tc)
-tc.assumeTrue(stdlib.has_python() || (isunix() && stdlib.java_api() >= 11))
 
 tc.verifyEqual(stdlib.inode("."), stdlib.inode(pwd()))
 end
 
 
 function test_owner(tc)
-tc.assumeTrue((~ispc() && stdlib.has_python()) || stdlib.has_java())
 
 s = stdlib.get_owner(".");