use /proc/self/exe directly when re-execing ourself when possible

this will use the same binary that is currently running, even if it has
been deleted or replaced

4 files changed, 15 insertions, 4 deletions

diff --git a/src/info.rs b/src/info.rs
index dc62125..6a5ad4f 100644
--- a/src/info.rs
+++ b/src/info.rs
@@ -35,6 +35,17 @@ pub fn pid() -> String {
     nix::unistd::getpid().to_string()
 }
 
+#[cfg(target_os = "linux")]
+#[allow(clippy::unnecessary_wraps)]
+pub fn current_exe() -> Result<std::path::PathBuf> {
+    Ok("/proc/self/exe".into())
+}
+
+#[cfg(not(target_os = "linux"))]
+pub fn current_exe() -> Result<std::path::PathBuf> {
+    Ok(std::env::current_exe()?)
+}
+
 // the time crate is currently unable to get the local offset on unix due to
 // soundness concerns, so we have to do it manually/:
 //
diff --git a/src/parse/ast.rs b/src/parse/ast.rs
index 92c04ab..5bceed5 100644
--- a/src/parse/ast.rs
+++ b/src/parse/ast.rs
@@ -171,7 +171,7 @@ impl Exe {
             return Self {
                 exe: Word {
                     parts: vec![WordPart::SingleQuoted(
-                        std::env::current_exe()
+                        crate::info::current_exe()
                             .unwrap()
                             .to_str()
                             .unwrap()
@@ -370,7 +370,7 @@ impl WordPart {
             Self::Alternation(_) => unreachable!(),
             Self::Substitution(commands) => {
                 let mut cmd = tokio::process::Command::new(
-                    std::env::current_exe().unwrap(),
+                    crate::info::current_exe().unwrap(),
                 );
                 cmd.args(&["-c", &commands]);
                 cmd.stdin(std::process::Stdio::inherit());
diff --git a/src/parse/test_ast.rs b/src/parse/test_ast.rs
index fb3a4e3..a1f83dd 100644
--- a/src/parse/test_ast.rs
+++ b/src/parse/test_ast.rs
@@ -216,7 +216,7 @@ fn test_basic() {
     );
 
     // XXX this parse may change in the future
-    let exe = std::env::current_exe()
+    let exe = crate::info::current_exe()
         .unwrap()
         .into_os_string()
         .into_string()
diff --git a/src/shell/history/entry.rs b/src/shell/history/entry.rs
index 56f378a..145e0cf 100644
--- a/src/shell/history/entry.rs
+++ b/src/shell/history/entry.rs
@@ -296,7 +296,7 @@ impl Entry {
         env: &Env,
         pts: &pty_process::Pts,
     ) -> Result<(tokio::process::Child, std::fs::File)> {
-        let mut cmd = pty_process::Command::new(std::env::current_exe()?);
+        let mut cmd = pty_process::Command::new(crate::info::current_exe()?);
         cmd.args(&["-c", cmdline, "--status-fd", "3"]);
         env.apply(&mut cmd);
         let (from_r, from_w) =