image: factor out create_chroot into its own file

Signed-off-by: InsanePrawn <insane.prawny@gmail.com>

chroot.py

@@ -0,0 +1,36 @@
+import logging
+import subprocess
+
+def create_chroot(chroot_path, packages=['base'], pacman_conf='/app/src/pacman.conf'):
+    result = subprocess.run(['pacstrap',
+                             '-C', pacman_conf,
+                             '-c',
+                             '-G',
+                             chroot_path]
+                            + packages
+                            + ['--needed', '--overwrite=*', '-yyuu'])
+    if result.returncode != 0:
+        logging.fatal('Failed to install system')
+        exit(1)
+
+    user = 'kupfer'
+    password = '123456'
+    groups = ['network', 'video', 'audio', 'optical', 'storage',
+              'input', 'scanner', 'games', 'lp', 'rfkill', 'wheel']
+    install_script = '\n'.join([
+        f'if ! id -u "{user}" >/dev/null 2>&1; then',
+        f'  useradd -m {user}',
+        f'fi',
+        f'usermod -a -G {",".join(groups)} {user}',
+        f'echo "{user}:{password}" | chpasswd',
+        f'chown {user}:{user} /home/{user} -R',
+    ])
+    result = subprocess.run(['arch-chroot',
+                             chroot_path,
+                             '/bin/bash',
+                             '-c',
+                             install_script])
+    if result.returncode != 0:
+        logging.fatal('Failed to setup user')
+        exit(1)
+