2017-04-21 22:20:13 -07:00
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use ::prelude::*;
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pub struct Platform;
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pub trait PlatformInterface {
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/// Construct a command equivelant to running the script at `path` with the
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/// shebang line `shebang`
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fn make_shebang_command(path: &Path, command: &str, argument: Option<&str>) -> process::Command;
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/// Set the execute permission on the file pointed to by `path`
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fn set_execute_permission(path: &Path) -> Result<(), io::Error>;
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/// Extract the signal from a process exit status, if it was terminated by a signal
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fn signal_from_exit_status(exit_status: process::ExitStatus) -> Option<i32>;
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}
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#[cfg(unix)]
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impl PlatformInterface for Platform {
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fn make_shebang_command(path: &Path, _command: &str, _argument: Option<&str>) -> process::Command {
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// shebang scripts can be executed directly on unix
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process::Command::new(path)
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}
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fn set_execute_permission(path: &Path) -> Result<(), io::Error> {
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use std::os::unix::fs::PermissionsExt;
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// get current permissions
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let mut permissions = fs::metadata(&path)?.permissions();
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// set the execute bit
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let current_mode = permissions.mode();
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permissions.set_mode(current_mode | 0o100);
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// set the new permissions
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fs::set_permissions(&path, permissions)
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}
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fn signal_from_exit_status(exit_status: process::ExitStatus) -> Option<i32> {
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use std::os::unix::process::ExitStatusExt;
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exit_status.signal()
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}
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}
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#[cfg(windows)]
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impl PlatformInterface for Platform {
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fn make_shebang_command(path: &Path, command: &str, argument: Option<&str>) -> process::Command {
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2017-04-22 21:39:29 -07:00
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let mut cmd = match env::var_os("EXEPATH") {
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Some(exepath) => {
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// On MinGW, `EXEPATH` is the root of the installation. Use it to
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// construct a full windows path to the binary in the shebang line.
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let mut translated_command = PathBuf::from(exepath);
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for part in command.split("/") {
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translated_command.push(part);
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}
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process::Command::new(translated_command)
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}
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None => {
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// We're not on MinGW >_< The path in the shebang might be a windows
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// path, in which case it'll work, so just use it and hope for the best.
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process::Command::new(command)
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}
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};
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2017-04-21 22:20:13 -07:00
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if let Some(argument) = argument {
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cmd.arg(argument);
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}
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cmd.arg(path);
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cmd
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}
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fn set_execute_permission(_path: &Path) -> Result<(), io::Error> {
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// it is not necessary to set an execute permission on a script on windows,
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// so this is a nop
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Ok(())
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}
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fn signal_from_exit_status(_exit_status: process::ExitStatus) -> Option<i32> {
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// The rust standard library does not expose a way to extract a signal
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// from a process exit status, so just return None
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None
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}
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}
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