Recovery installer zip (#404)

Supports flashing with TWRP and other Android recovery OS through adb sideload,
as well as exporting a generated recovery zip file.
See also:
https://github.com/postmarketOS/pmbootstrap/wiki/deviceinfo_flash_methods#recovery-mode-adb

pmb/install/recovery.py

@@ -0,0 +1,61 @@
+"""
+Copyright 2017 Attila Szollosi
+
+This file is part of pmbootstrap.
+
+pmbootstrap is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+pmbootstrap is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with pmbootstrap.  If not, see <http://www.gnu.org/licenses/>.
+"""
+import logging
+
+import pmb.chroot
+
+
+def create_zip(args, suffix):
+    """
+    Create android recovery compatible installer zip.
+    """
+    zip_root = "/var/lib/postmarketos-android-recovery-installer/"
+    rootfs = "/mnt/rootfs_" + args.device
+
+    # Install recovery installer package in buildroot
+    pmb.chroot.apk.install(args,
+                           ["postmarketos-android-recovery-installer"],
+                           suffix)
+
+    logging.info("(" + suffix + ") create recovery zip")
+
+    # Create config file for the recovery installer
+    with open(args.work + "/chroot_" + suffix + "/tmp/install_options",
+              "w") as install_options:
+        install_options.write(
+            "\n".join(['DEVICE="{}"'.format(args.device),
+                       'FLASH_BOOTIMG="{}"'.format(
+                           str(args.recovery_flash_bootimg).lower()),
+                       'INSTALL_PARTITION="{}"'.format(
+                           args.recovery_install_partition),
+                       'CIPHER="{}"'.format(args.cipher),
+                       'FDE="{}"'.format(
+                           str(args.full_disk_encryption).lower())]))
+
+    commands = [
+        # Move config file from /tmp/ to zip root
+        ["mv", "/tmp/install_options", "install_options"],
+        # Copy boot.img to zip root
+        ["cp", rootfs + "/boot/boot.img-" + args.device, "boot.img"],
+        # Create tar archive of the rootfs
+        ["tar", "-pczf", "rootfs.tar.gz", "--exclude", "./home/user/*",
+         "-C", rootfs, "."],
+        ["build-recovery-zip"]]
+    for command in commands:
+        pmb.chroot.root(args, command, suffix, working_dir=zip_root)