pmbootstrap chroot --install-blockdev: new option

Create /dev/install inside the chroot from a block device, just like
done during the installation. This is useful for testing the Calamares
installer.

pmb/helpers/frontend.py

@@ -25,6 +25,7 @@ import pmb.helpers.run
 import pmb.helpers.aportupgrade
 import pmb.helpers.status
 import pmb.install
+import pmb.install.blockdevice
 import pmb.parse
 import pmb.qemu
 
@@ -132,6 +133,13 @@ def chroot(args):
         env["DISPLAY"] = os.environ.get("DISPLAY")
         env["XAUTHORITY"] = "/home/pmos/.Xauthority"
 
+    # Install blockdevice
+    if args.install_blockdev:
+        size_boot = 128 * 1024 * 1024  # 128 MB
+        size_root = 4096 * 1024 * 1024  # 4 GB
+        pmb.install.blockdevice.create_and_mount_image(args, size_boot,
+                                                       size_root)
+
     # Run the command as user/root
     if args.user:
         logging.info("(" + suffix + ") % su pmos -c '" +

pmb/parse/arguments.py

@@ -497,6 +497,10 @@ def arguments():
                         help="Copy .Xauthority and set environment variables,"
                              " so X11 applications can be started (native"
                              " chroot only)")
+    chroot.add_argument("-i", "--install-blockdev", action="store_true",
+                        help="Create a sparse image file and mount it as"
+                              " /dev/install, just like during the"
+                              " installation process.")
     for action in [build_init, chroot]:
         suffix = action.add_mutually_exclusive_group()
         if action == chroot: