add is_removable()

Author: scivision

+stdlib/is_removable.m

@@ -0,0 +1,41 @@
+%% IS_REMOVABLE - Check if a file path is on a removable drive
+% Not necessarily perfectly reliable at detection, but works for most cases.
+
+function y  = is_removable(filepath)
+
+y = false;
+
+if ispc()
+  drive = stdlib.root_name(filepath);
+  cmd1 = strcat('wmic logicaldisk where "DeviceID=''', drive, '''" get DriveType');
+else
+  cmd1 = "df " + filepath + " | tail -n 1 | awk '{print $1}'";
+end
+[s1, m1] = system(cmd1);
+if s1 ~= 0
+  return
+end
+
+
+if ispc()
+
+  y = any(ismember(strtrim(extractAfter(m1, "DriveType")), ["2", "5"]));
+  % https://learn.microsoft.com/en-us/windows/win32/cimwin32prov/win32-logicaldisk
+
+elseif ismac()
+
+  cmd2 = ['diskutil info ', m1];
+  [s2, m2] = system(cmd2);
+  y = s2 == 0 && contains(m2, "Removable Media:" + whitespacePattern + "Removable");
+
+else
+
+  dev = strtrim(extractAfter(m1, '/dev/'));
+  f1 = strcat('/sys/class/block/', dev, '/removable');
+  if isfile(f1)
+    y = strtrim(fileread(f1)) == "1";
+  end
+
+end
+
+end

test/TestDisk.m

@@ -42,6 +42,14 @@ function test_disk_ac(tc, Ps, disk_ac_fun, disk_ac_name)
 end
 
 
+function test_is_removable(tc)
+
+y = stdlib.is_removable(pwd());
+tc.verifyClass(y, 'logical')
+
+end
+
+
 function test_hard_link_count(tc, hl_fun)
 fname = "hard_link_count";
 n = "stdlib." + hl_fun + "." + fname;