Merge pull request #11279 from malmaud/ismount

Added ismount function.

base/exports.jl

@@ -1266,6 +1266,7 @@ export
     isfifo,
     isfile,
     islink,
+    ismount,
     ispath,
     isreadable,
     issetgid,

base/stat.jl

@@ -124,3 +124,18 @@ function samefile(a::AbstractString, b::AbstractString)
         return false
     end
 end
+
+function ismount(path...)
+    path = joinpath(path...)
+    isdir(path) || return false
+    s1 = lstat(path)
+    # Symbolic links cannot be mount points
+    islink(s1) && return false
+    parent_path = joinpath(path, "..")
+    s2 = lstat(parent_path)
+    # If a directory and its parent are on different devices,  then the
+    # directory must be a mount point
+    (s1.device != s2.device) && return true
+    (s1.inode == s2.inode) && return true
+    false
+end

doc/stdlib/file.rst

@@ -186,6 +186,10 @@
 
    Returns ``true`` if ``path`` is a symbolic link, ``false`` otherwise.
 
+.. function:: ismount(path) -> Bool
+
+   Returns ``true`` if ``path`` is a mount point, ``false`` otherwise.
+
 .. function:: ispath(path) -> Bool
 
    Returns ``true`` if ``path`` is a valid filesystem path, ``false`` otherwise.