Remove dependency on wsl crate

opener/Cargo.toml

@@ -20,7 +20,6 @@ version-sync = "0.9"
 
 [target.'cfg(target_os = "linux")'.dependencies]
 bstr = "0.2"
-wsl = "0.1"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["shellapi"] }

opener/src/lib.rs

@@ -169,7 +169,7 @@ impl Error for OpenError {
 
 #[cfg(target_os = "linux")]
 fn is_wsl() -> bool {
-    wsl::is_wsl()
+    sys::is_wsl()
 }
 
 #[cfg(not(target_os = "linux"))]

opener/src/linux_and_more.rs

@@ -1,8 +1,8 @@
 use crate::OpenError;
 use std::ffi::OsStr;
-use std::io;
 use std::io::Write;
 use std::process::{Child, Command, Stdio};
+use std::{fs, io};
 
 const XDG_OPEN_SCRIPT: &[u8] = include_bytes!("xdg-open");
 
@@ -76,3 +76,33 @@ fn open_with_internal_xdg_open(path: &OsStr) -> Result<Child, OpenError> {
 
     Ok(sh)
 }
+
+pub(crate) fn is_wsl() -> bool {
+    if is_docker() {
+        return false;
+    }
+
+    if let Ok(true) = fs::read_to_string("/proc/sys/kernel/osrelease")
+        .map(|osrelease| osrelease.to_ascii_lowercase().contains("microsoft"))
+    {
+        return true;
+    }
+
+    if let Ok(true) = fs::read_to_string("/proc/version")
+        .map(|version| version.to_ascii_lowercase().contains("microsoft"))
+    {
+        return true;
+    }
+
+    false
+}
+
+fn is_docker() -> bool {
+    let has_docker_env = fs::metadata("/.dockerenv").is_ok();
+
+    let has_docker_cgroup = fs::read_to_string("/proc/self/cgroup")
+        .map(|cgroup| cgroup.to_ascii_lowercase().contains("docker"))
+        .unwrap_or(false);
+
+    has_docker_env || has_docker_cgroup
+}