hostsfile: Copy the SELinux context to the temp file before overwrite

README.md

@@ -226,6 +226,12 @@ Note that you'll be responsible for updating manually.
 
 ## Development
 
+### Cargo build feature for SELinux
+
+If your target system uses SELinux, you will want to enable the 'selinux' feature when building the innernet binary.
+This will ensure that innernet maintains the correct selinux context on the /etc/hosts file when adding hosts.  To do so add ```--features selinux``` to the ```cargo build``` options.
+The `selinux-devel` package will need to be installed for the correct headers.
+
 ### `innernet-server` Build dependencies
 
 - `rustc` / `cargo` (version 1.50.0 or higher)

client/Cargo.toml

@@ -40,6 +40,9 @@ wireguard-control = { path = "../wireguard-control" }
 once_cell = "1.17.1"
 tempfile = "3"
 
+[features]
+selinux = ["hostsfile/selinux"]
+
 [package.metadata.deb]
 assets = [
   ["target/release/innernet", "usr/bin/", "755"],