env-share: initial implementation

env-share/.gitignore

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+/target
+Cargo.lock

env-share/Cargo.toml

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+[package]
+name = "env-share"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
+pico-args = "0.5.0"
+

env-share/scripts/env-share.ps1

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+
+#	make sure the file exists
+$file = $env:ENV_SHARE_FILE
+if -not (Test-Path $file) {
+	exit
+}
+
+#	insert values into env
+foreach($line in Get-Content $file) {
+	$parts = $line -split ' = '
+	$var = $parts[0]
+	$value = $parts[1]
+	Set-Item env:$var -Value $value
+}
+
+#	delete the file
+Remove-Item $file
+

env-share/src/error.rs

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+use std::process::exit;
+
+pub fn file_unset() {
+	println!("env-share: ENV_SHARE_FILE is unset");
+	exit(1);
+}
+
+pub fn vars_unset() {
+	println!("env-share: ENV_SHARE_VARS is unset");
+	exit(1);
+}
+
+
+pub fn write_fail(file: &String) {
+	println!("env-share: failed to write to '{file}'");
+	exit(2);
+}
+

env-share/src/main.rs

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+use std::{
+	env,
+	fs::write
+};
+
+mod error;
+
+fn main() {
+	//	try to get share file variable
+	if let Ok(file) = env::var("ENV_SHARE_FILE") {
+		if let Ok(var_string) = env::var("ENV_SHARE_VARS") {
+			//	build output
+			let mut output = String::new();
+			let vars = var_string.split(':');
+			for var in vars {
+				let value = env::var(var).unwrap_or(String::new());
+				if value.is_empty() { continue; }
+
+				output += &format!("{var} = {value}\n");
+			}
+
+			//	write to file
+			let result = write(&file, output);
+			match result {
+				Err(_)	=>	error::write_fail(&file),
+				_		=>	{ }
+			}
+		} else { error::vars_unset(); }
+	} else { error::file_unset(); }
+}
+

man/env-share.1

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+.Dd $Mdocdate$
+.Dt ENV-SHARE 1
+.Os
+.Sh NAME
+.Nm env-share
+.Nd share environment variables back to Windows from WSL
+.Sh SYNOPSIS
+.Nm env-share
+.Sh DESCRIPTION
+The
+.Nm
+utility writes environment variables to a file to be loaded by a script in the target process.
+.Sh ENVIRONMENT
+.Bl -tag -width Ds
+.It Ev ENV_SHARE_FILE
+The file to write variables to.
+.It Ev ENV_SHARE_VARS
+A colon-separated list of variables to copy.
+.El
+.Sh EXIT STATUS
+.Bl -tag -width Ds
+.It 1
+An environment variable is unset.
+.It 2
+Failed to write to the file at
+.Ev ENV_SHARE_FILE
+.El
+.Sh AUTHORS
+.An -nosplit
+.An Valerie Wolfe Aq Mt sleeplessval@gmail.com