Support Amazon Linux (fix #385)

src/steps/os/linux.rs

@@ -45,6 +45,8 @@ impl Distribution {
         if let Some(id_like) = id_like {
             if id_like.contains(&"debian") || id_like.contains(&"ubuntu") {
                 return Ok(Distribution::Debian);
+            } else if id_like.contains(&"centos") {
+                return Ok(Distribution::CentOS);
             } else if id_like.contains(&"suse") {
                 return Ok(Distribution::Suse);
             } else if id_like.contains(&"arch") || id_like.contains(&"archlinux") {
@@ -553,6 +555,11 @@ mod tests {
         test_template(&include_str!("os_release/exherbo"), Distribution::Exherbo);
     }
 
+    #[test]
+    fn test_amazon_linux() {
+        test_template(&include_str!("os_release/amazon_linux"), Distribution::CentOS);
+    }
+
     #[test]
     fn test_nixos() {
         test_template(&include_str!("os_release/nixos"), Distribution::NixOS);

src/steps/os/os_release/amazon_linux

@@ -0,0 +1,9 @@
+NAME="Amazon Linux"
+VERSION="2"
+ID="amzn"
+ID_LIKE="centos rhel fedora"
+VERSION_ID="2"
+PRETTY_NAME="Amazon Linux 2"
+ANSI_COLOR="0;33"
+CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2"
+HOME_URL="https://amazonlinux.com/"