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| 1 | +use std::{ |
| 2 | + ffi::OsString, |
| 3 | + path::Path, |
| 4 | + process::{Command, Stdio}, |
| 5 | + thread, |
| 6 | + time::Duration, |
| 7 | +}; |
| 8 | + |
| 9 | +use log::{debug, error, warn}; |
| 10 | + |
| 11 | +const UI_RELAUNCH_HELPER_ENV: &str = "PORTMASTER_UI_RELAUNCH_HELPER"; |
| 12 | +const RELAUNCH_RETRY_COUNT: usize = 40; |
| 13 | +const RELAUNCH_RETRY_DELAY: Duration = Duration::from_millis(500); |
| 14 | + |
| 15 | +fn current_process_argv0() -> Option<OsString> { |
| 16 | + std::env::args_os().next() |
| 17 | +} |
| 18 | + |
| 19 | +fn is_usable_launch_program(program: &OsString) -> bool { |
| 20 | + let path = Path::new(program); |
| 21 | + |
| 22 | + // Fail closed for command-only values (for example, "portmaster"): we cannot |
| 23 | + // verify where they resolve to, so do not use them for relaunch. |
| 24 | + if !path.is_absolute() && path.components().count() <= 1 { |
| 25 | + return false; |
| 26 | + } |
| 27 | + |
| 28 | + if !path.exists() || !path.is_file() { |
| 29 | + return false; |
| 30 | + } |
| 31 | + |
| 32 | + #[cfg(unix)] |
| 33 | + { |
| 34 | + use std::os::unix::fs::PermissionsExt; |
| 35 | + |
| 36 | + if let Ok(meta) = std::fs::metadata(path) { |
| 37 | + return meta.permissions().mode() & 0o111 != 0; |
| 38 | + } |
| 39 | + return false; |
| 40 | + } |
| 41 | + |
| 42 | + #[cfg(not(unix))] |
| 43 | + { |
| 44 | + true |
| 45 | + } |
| 46 | +} |
| 47 | + |
| 48 | +fn resolve_launch_program() -> Result<OsString, String> { |
| 49 | + let current_exe = std::env::current_exe().ok().map(|p| p.into_os_string()); |
| 50 | + let argv0 = current_process_argv0(); |
| 51 | + |
| 52 | + if let Some(program) = current_exe.as_ref().filter(|p| is_usable_launch_program(p)) { |
| 53 | + return Ok(program.clone()); |
| 54 | + } |
| 55 | + |
| 56 | + if let Some(program) = argv0.as_ref().filter(|p| is_usable_launch_program(p)) { |
| 57 | + return Ok(program.clone()); |
| 58 | + } |
| 59 | + |
| 60 | + Err("failed to determine relaunch executable: no verified launchable file path from current_exe or argv0".to_string()) |
| 61 | +} |
| 62 | + |
| 63 | +fn current_process_args() -> Vec<OsString> { |
| 64 | + std::env::args_os() |
| 65 | + .skip(1) |
| 66 | + .filter(|arg| { |
| 67 | + // On upgrade-triggered relaunch we always want to show the UI, |
| 68 | + // so do not propagate background startup flags. |
| 69 | + arg != "--background" && arg != "-b" |
| 70 | + }) |
| 71 | + .collect() |
| 72 | +} |
| 73 | + |
| 74 | +pub fn request_ui_relaunch() -> Result<(), String> { |
| 75 | + let exe = resolve_launch_program()?; |
| 76 | + let args = current_process_args(); |
| 77 | + |
| 78 | + let mut cmd = Command::new(&exe); |
| 79 | + cmd.args(&args) |
| 80 | + .env(UI_RELAUNCH_HELPER_ENV, "1") |
| 81 | + .stdin(Stdio::null()) |
| 82 | + .stdout(Stdio::null()) |
| 83 | + .stderr(Stdio::null()); |
| 84 | + |
| 85 | + cmd.spawn() |
| 86 | + .map_err(|err| format!("failed to spawn relaunch helper process: {}", err))?; |
| 87 | + |
| 88 | + Ok(()) |
| 89 | +} |
| 90 | + |
| 91 | +pub fn run_relaunch_helper_if_requested() { |
| 92 | + if std::env::var(UI_RELAUNCH_HELPER_ENV).ok().as_deref() != Some("1") { |
| 93 | + return; |
| 94 | + } |
| 95 | + |
| 96 | + if let Err(err) = run_relaunch_helper() { |
| 97 | + error!("[tauri] relaunch helper failed: {}", err); |
| 98 | + } |
| 99 | + |
| 100 | + std::process::exit(0); |
| 101 | +} |
| 102 | + |
| 103 | +fn run_relaunch_helper() -> Result<(), String> { |
| 104 | + let exe = resolve_launch_program()?; |
| 105 | + let args = current_process_args(); |
| 106 | + |
| 107 | + debug!("[tauri] relaunch helper started"); |
| 108 | + |
| 109 | + for attempt in 1..=RELAUNCH_RETRY_COUNT { |
| 110 | + let mut cmd = Command::new(&exe); |
| 111 | + cmd.args(&args) |
| 112 | + .env_remove(UI_RELAUNCH_HELPER_ENV) |
| 113 | + .stdin(Stdio::null()) |
| 114 | + .stdout(Stdio::null()) |
| 115 | + .stderr(Stdio::null()); |
| 116 | + |
| 117 | + let mut child = cmd |
| 118 | + .spawn() |
| 119 | + .map_err(|err| format!("failed to spawn replacement process: {}", err))?; |
| 120 | + |
| 121 | + thread::sleep(RELAUNCH_RETRY_DELAY); |
| 122 | + |
| 123 | + match child.try_wait() { |
| 124 | + Ok(Some(status)) => { |
| 125 | + // Most commonly means the single-instance guard still detected a running instance. |
| 126 | + warn!( |
| 127 | + "[tauri] replacement process exited quickly (attempt {}/{}; status={}), retrying", |
| 128 | + attempt, |
| 129 | + RELAUNCH_RETRY_COUNT, |
| 130 | + status |
| 131 | + ); |
| 132 | + thread::sleep(RELAUNCH_RETRY_DELAY); |
| 133 | + } |
| 134 | + Ok(None) => { |
| 135 | + debug!( |
| 136 | + "[tauri] replacement process is running (attempt {}/{})", |
| 137 | + attempt, |
| 138 | + RELAUNCH_RETRY_COUNT |
| 139 | + ); |
| 140 | + return Ok(()); |
| 141 | + } |
| 142 | + Err(err) => { |
| 143 | + return Err(format!("failed to observe replacement process status: {}", err)); |
| 144 | + } |
| 145 | + } |
| 146 | + } |
| 147 | + |
| 148 | + Err(format!( |
| 149 | + "failed to relaunch UI process after {} attempts", |
| 150 | + RELAUNCH_RETRY_COUNT |
| 151 | + )) |
| 152 | +} |
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