add script to fix bwrap permissions

README.md

@@ -153,6 +153,11 @@ Any writes to the squashfs will persist, but they will not be compressed when sa
 
 On the regular XFCE4 image, this brings the rootfs size down to 1.2GB from 3.5GB.
 
+#### Steam doesn't work.
+Steam doesn't work out of the box due to security features in the shim kernel preventing the `bwrap` library from working. See [issue #12](https://github.com/ading2210/shimboot/issues/26#issuecomment-2151893062) for more info. 
+
+To get Steam running, install and run it normally. It will fail and show a message saying that "Steam now requires user namespaces to be enabled." Run `fix_brwap` in your terminal, relaunch Steam, and it should be working again. 
+
 ## Copyright:
 Shimboot is licensed under the [GNU GPL v3](https://www.gnu.org/licenses/gpl-3.0.txt). Unless otherwise indicated, all code has been written by me, [ading2210](https://github.com/ading2210).
 

rootfs/usr/local/bin/fix_bwrap

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -e
+
+if [ ! "$HOME_DIR" ]; then
+  sudo HOME_DIR="$HOME" $0 
+  exit 0
+fi
+
+fix_perms() {
+  local target_file="$1"
+  chown root:root "$target_file"
+  chmod u+s "$target_file"
+}
+
+fix_perms /usr/bin/bwrap
+
+steam_bwraps="$(find "$HOME_DIR/.steam/" -name 'srt-bwrap')"
+for bwrap_bin in $steam_bwraps; do
+  cp /usr/bin/bwrap "$bwrap_bin"
+  fix_perms "$bwrap_bin"
+done