factor out os-specific calls

also use the unix form instead of linux to hopefully fix osx

1 files changed, 34 insertions, 0 deletions

diff --git a/src/sys/unix.rs b/src/sys/unix.rs
new file mode 100644
index 0000000..0f433b3
--- /dev/null
+++ b/src/sys/unix.rs
@@ -0,0 +1,34 @@
+use users;
+use std;
+
+use std::os::unix::fs::MetadataExt;
+use std::os::unix::fs::PermissionsExt;
+
+pub fn path_writable(path: &std::path::Path) -> super::PathWritability {
+    std::fs::metadata(path)
+        .map(|stat| {
+            // XXX there really has to be a better option here
+            let euid = users::get_effective_uid();
+            let egid = users::get_effective_gid();
+            let file_uid = stat.uid();
+            let file_gid = stat.gid();
+            let file_mode = stat.permissions().mode();
+
+            if euid == 0 {
+                super::PathWritability::Writable
+            }
+            else if (file_uid == euid) && (file_mode & 0o200 != 0) {
+                super::PathWritability::Writable
+            }
+            else if (file_gid == egid) && (file_mode & 0o020 != 0) {
+                super::PathWritability::Writable
+            }
+            else if file_mode & 0o002 != 0 {
+                super::PathWritability::Writable
+            }
+            else {
+                super::PathWritability::NotWritable
+            }
+        })
+        .unwrap_or(super::PathWritability::NotExist)
+}