feat: Add 'satra update' command and auto-upgrade support in installer

README.md

@@ -22,6 +22,20 @@ A lightweight terminal-based process launcher and tracker.
 curl -sSL https://raw.githubusercontent.com/TattvaOrg/Satra/main/install.sh | bash
 ```
 
+## Updating
+
+Update Satra to the latest version at any time:
+
+```sh
+satra update
+```
+
+Or re-run the installer:
+
+```sh
+curl -sSL https://raw.githubusercontent.com/TattvaOrg/Satra/main/install.sh | bash
+```
+
 ## Features
 
 - Detached process launching

install.sh

@@ -1,8 +1,6 @@
 #!/bin/bash
 set -e
 
-echo "==> Installing Satra..."
-
 ARCH=$(uname -m)
 case $ARCH in
     x86_64)
@@ -21,27 +19,49 @@ BIN_DIR="${CARGO_HOME:-$HOME/.local}/bin"
 [ -d "$HOME/.local/bin" ] && BIN_DIR="$HOME/.local/bin"
 mkdir -p "$BIN_DIR"
 
+IS_UPDATE=false
+if [ -f "$BIN_DIR/satra" ]; then
+    IS_UPDATE=true
+    CURRENT_VERSION=$("$BIN_DIR/satra" --version 2>/dev/null || echo "existing")
+    echo "==> Existing Satra installation detected ($CURRENT_VERSION)."
+    echo "==> Updating Satra at $BIN_DIR/satra..."
+else
+    echo "==> Installing Satra to $BIN_DIR/satra..."
+fi
+
 URL="https://github.com/TattvaOrg/Satra/releases/latest/download/satra-$TARGET_ARCH-linux"
 TMP_BIN=$(mktemp)
 trap 'rm -f "$TMP_BIN"' EXIT
 
-echo "==> Downloading prebuilt binary from GitHub Releases..."
+echo "==> Fetching prebuilt release binary..."
 if curl -sSfL "$URL" -o "$TMP_BIN" 2>/dev/null; then
     # Verify file is an executable binary and not an error page
     if file "$TMP_BIN" | grep -qE "ELF|executable"; then
-        mv "$TMP_BIN" "$BIN_DIR/satra"
+        # Unlink existing binary first to avoid ETXTBSY if currently running
+        rm -f "$BIN_DIR/satra"
+        mv -f "$TMP_BIN" "$BIN_DIR/satra"
         chmod +x "$BIN_DIR/satra"
-        echo "✅ Installed successfully to $BIN_DIR/satra"
+        NEW_VER=$("$BIN_DIR/satra" --version 2>/dev/null || echo "")
+        if [ "$IS_UPDATE" = true ]; then
+            echo "✅ Satra updated successfully! ($NEW_VER)"
+        else
+            echo "✅ Satra installed successfully! ($NEW_VER)"
+        fi
     else
         echo "Error: Downloaded file is not a valid binary."
         exit 1
     fi
 else
     echo "Notice: Prebuilt release binary not found at $URL"
     if command -v cargo >/dev/null 2>&1; then
-        echo "==> Compiling and installing from source using cargo..."
-        cargo install --git https://github.com/TattvaOrg/Satra.git --root "${BIN_DIR%/bin}"
-        echo "✅ Compiled and installed successfully via cargo to $BIN_DIR/satra"
+        echo "==> Compiling and updating from source using cargo..."
+        cargo install --force --git https://github.com/TattvaOrg/Satra.git --root "${BIN_DIR%/bin}"
+        NEW_VER=$("$BIN_DIR/satra" --version 2>/dev/null || echo "")
+        if [ "$IS_UPDATE" = true ]; then
+            echo "✅ Satra updated successfully via cargo! ($NEW_VER)"
+        else
+            echo "✅ Satra installed successfully via cargo! ($NEW_VER)"
+        fi
     else
         echo "Error: Could not download prebuilt binary and 'cargo' is not installed."
         echo "Please install Rust (https://rustup.rs) or check https://github.com/TattvaOrg/Satra/releases"

src/main.rs

@@ -15,14 +15,39 @@ fn main() -> Result<(), io::Error> {
     let args: Vec<String> = std::env::args().collect();
     if args.len() > 1 {
         match args[1].as_str() {
+            "update" => {
+                println!("==> Checking for updates and updating Satra...");
+                let status = std::process::Command::new("bash")
+                    .arg("-c")
+                    .arg("curl -sSL https://raw.githubusercontent.com/TattvaOrg/Satra/main/install.sh | bash")
+                    .status();
+
+                match status {
+                    Ok(s) if s.success() => {
+                        println!("==> Update completed successfully.");
+                        return Ok(());
+                    }
+                    Ok(s) => {
+                        eprintln!("Error: Update process exited with code: {:?}", s.code());
+                        std::process::exit(s.code().unwrap_or(1));
+                    }
+                    Err(e) => {
+                        eprintln!("Error running update: {}", e);
+                        std::process::exit(1);
+                    }
+                }
+            }
             "-v" | "--version" => {
                 println!("satra {}", env!("CARGO_PKG_VERSION"));
                 return Ok(());
             }
             "-h" | "--help" => {
                 println!("Satra - A lightweight terminal-based process launcher and tracker");
                 println!();
-                println!("Usage: satra [OPTIONS]");
+                println!("Usage: satra [COMMAND] [OPTIONS]");
+                println!();
+                println!("Commands:");
+                println!("  update           Update Satra to the latest version");
                 println!();
                 println!("Options:");
                 println!("  -h, --help       Print help information");