Import 'which' package version 3.1.1platform-tools-30.0.3platform-tools-30.0.2platform-tools-30.0.1platform-tools-30.0.0

* Add OWNERS
Bug: 152884384
Test: make

Change-Id: Ic643b3c23001db1124e626548e13e43b27b89c7b

1 files changed, 70 insertions, 0 deletions

diff --git a/src/checker.rs b/src/checker.rs
new file mode 100644
index 0000000..6021711
--- /dev/null
+++ b/src/checker.rs
@@ -0,0 +1,70 @@
+use finder::Checker;
+#[cfg(unix)]
+use libc;
+#[cfg(unix)]
+use std::ffi::CString;
+use std::fs;
+#[cfg(unix)]
+use std::os::unix::ffi::OsStrExt;
+use std::path::Path;
+
+pub struct ExecutableChecker;
+
+impl ExecutableChecker {
+    pub fn new() -> ExecutableChecker {
+        ExecutableChecker
+    }
+}
+
+impl Checker for ExecutableChecker {
+    #[cfg(unix)]
+    fn is_valid(&self, path: &Path) -> bool {
+        CString::new(path.as_os_str().as_bytes())
+            .and_then(|c| Ok(unsafe { libc::access(c.as_ptr(), libc::X_OK) == 0 }))
+            .unwrap_or(false)
+    }
+
+    #[cfg(windows)]
+    fn is_valid(&self, _path: &Path) -> bool {
+        true
+    }
+}
+
+pub struct ExistedChecker;
+
+impl ExistedChecker {
+    pub fn new() -> ExistedChecker {
+        ExistedChecker
+    }
+}
+
+impl Checker for ExistedChecker {
+    fn is_valid(&self, path: &Path) -> bool {
+        fs::metadata(path)
+            .map(|metadata| metadata.is_file())
+            .unwrap_or(false)
+    }
+}
+
+pub struct CompositeChecker {
+    checkers: Vec<Box<dyn Checker>>,
+}
+
+impl CompositeChecker {
+    pub fn new() -> CompositeChecker {
+        CompositeChecker {
+            checkers: Vec::new(),
+        }
+    }
+
+    pub fn add_checker(mut self, checker: Box<dyn Checker>) -> CompositeChecker {
+        self.checkers.push(checker);
+        self
+    }
+}
+
+impl Checker for CompositeChecker {
+    fn is_valid(&self, path: &Path) -> bool {
+        self.checkers.iter().all(|checker| checker.is_valid(path))
+    }
+}