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isobuild/config/hooks/normal/0200-fix-permissions.hook.chroot

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+#!/bin/sh
+# Final permissions fix before squashfs creation
+# Ensures /etc and critical directories have correct permissions
+# This is CRITICAL - wrong permissions break login, networking, and services
+
+set -e
+
+echo "Fixing critical directory permissions..."
+
+# /etc must be world-readable for systemd and other services to work
+chmod 755 /etc
+
+# Fix all subdirectories in /etc that need to be readable
+for dir in /etc/systemd /etc/systemd/system /etc/systemd/network \
+           /etc/default /etc/security /etc/pam.d /etc/skel \
+           /etc/profile.d /etc/sudoers.d /etc/bash_completion.d \
+           /etc/apt /etc/dpkg /etc/ssl /etc/ssh /etc/sway; do
+    if [ -d "$dir" ]; then
+        chmod 755 "$dir"
+    fi
+done
+
+# Critical files that must be world-readable for system to function
+# These are essential for user/group lookups and shell login
+for file in /etc/passwd /etc/group /etc/hosts /etc/hostname \
+            /etc/profile /etc/bash.bashrc /etc/environment \
+            /etc/shells /etc/nsswitch.conf /etc/resolv.conf \
+            /etc/machine-id /etc/ld.so.conf; do
+    if [ -f "$file" ]; then
+        chmod 644 "$file"
+    fi
+done
+
+# Shadow files should be root-only readable
+chmod 640 /etc/shadow 2>/dev/null || true
+chmod 640 /etc/gshadow 2>/dev/null || true
+
+# Sudoers files need specific permissions
+chmod 440 /etc/sudoers 2>/dev/null || true
+if [ -d /etc/sudoers.d ]; then
+    find /etc/sudoers.d -type f -exec chmod 440 {} \;
+fi
+
+# Fix network config file permissions
+if [ -f /etc/systemd/network/10-wired.network ]; then
+    chmod 644 /etc/systemd/network/10-wired.network
+fi
+
+# Recursively fix /etc - directories should be 755, files 644 (except special cases)
+find /etc -type d -exec chmod 755 {} \; 2>/dev/null || true
+
+echo "Permissions fixed."