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1#!/usr/bin/env python
2# coding: utf-8
3# Copyright (c) 2021 Huawei Device Co., Ltd.
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#     http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16import sys
17import argparse
18import subprocess
19import os
20
21FS_TYPE = "ext4"
22BLOCKSIZE = 4096
23
24
25def args_parse(argv):
26    parser = argparse.ArgumentParser(description='mkextimage.py')
27
28    parser.add_argument("src_dir", help="The source file for sload.")
29    parser.add_argument("device", help="The device for mkfs.")
30    parser.add_argument("mount_point", help="The filesystem mountpoint.")
31    parser.add_argument("fs_size", help="The size of filesystem.")
32    parser.add_argument("--fs_type", help="The filesystem type.")
33    parser.add_argument("--dac_config",
34                        help="The path of dac config to e2fsdroid.")
35    parser.add_argument("--inode_size", help="The inode size to mke2fs.")
36    parser.add_argument("--file_context",
37                        help="The path of file_context to e2fsdroid.")
38    parser.add_argument("--root_dir", help="The root dir for root image.")
39    parser.add_argument("--journal_size", help="The journal_size for mke2fs.")
40    parser.add_argument("--reserve_percent",
41                        help="The reserve_percent for mke2fs.")
42    parser.add_argument("--extend_opts", nargs='+',
43                        help="The extend opt for mke2fs.(not support sparse)")
44    parser.add_argument("--encrypt", help="The fscrypt support.")
45
46    args = parser.parse_known_args(argv)[0]
47    return args
48
49
50def run_cmd(cmd):
51    res = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE,
52                           stderr=subprocess.PIPE)
53    sout, serr = res.communicate()
54
55    return res.pid, res.returncode, sout, serr
56
57
58def build_run_mke2fs(args):
59    mke2fs_opts = ""
60    mke2fs_cmd = ""
61    is_data = False
62
63    if "data" in args.mount_point:
64        is_data = True
65    if args.extend_opts:
66        mke2fs_opts += " -E " + ",".join(args.extend_opts)
67    if args.inode_size:
68        mke2fs_opts += " -I " + args.inode_size
69    else:
70        mke2fs_opts += " -I " + "256"
71    if args.journal_size:
72        mke2fs_opts += " -J size=" + args.journal_size
73    elif not is_data:
74        mke2fs_opts += " -O ^has_journal"
75    if args.reserve_percent:
76        mke2fs_opts += " -m " + args.reserve_percent
77    elif not is_data:
78        mke2fs_opts += " -m 0"
79    if is_data:
80        mke2fs_opts += " -O encrypt"
81    mke2fs_opts += " -L " + args.mount_point + " -M " + args.mount_point
82
83    blocks = int(int(args.fs_size) / BLOCKSIZE)
84    mke2fs_cmd += ("mke2fs " + str(mke2fs_opts) + " -t " + FS_TYPE + " -b "
85                   + str(BLOCKSIZE) + " " + args.device + " " + str(blocks))
86    res = run_cmd(mke2fs_cmd)
87    if res[1] != 0:
88        print("info: " + mke2fs_cmd)
89        print("pid " + str(res[0]) + " ret " + str(res[1]) + "\n" +
90              res[2].decode() + res[3].decode())
91    return res[1]
92
93
94def build_run_e2fsdroid(args):
95    libselinux_path = os.path.realpath("./clang_x64/security/selinux/")
96    os.environ['LD_LIBRARY_PATH'] = libselinux_path
97
98    e2fsdroid_opts = ""
99    e2fsdroid_cmd = ""
100
101    if not args.extend_opts or not "sparse" in args.extend_opts:
102        e2fsdroid_opts += " -e"
103    if args.dac_config:
104        e2fsdroid_opts += " -C " + args.dac_config
105    if args.file_context:
106        if(os.path.exists(args.file_context)):
107            e2fsdroid_opts += " -S " + args.file_context
108
109    e2fsdroid_cmd += ("e2fsdroid" + e2fsdroid_opts + " -f " +
110                      args.src_dir + " -a " + args.mount_point +
111                      " " + args.device)
112    res = run_cmd(e2fsdroid_cmd)
113    if res[1] != 0:
114        print("info: " + e2fsdroid_cmd)
115        print("pid " + str(res[0]) + " ret " + str(res[1]) + "\n" +
116              res[2].decode() + res[3].decode())
117    return res[1]
118
119
120def build(args):
121    args = args_parse(args)
122
123    res = build_run_mke2fs(args)
124    if res != 0:
125        print("error run mke2fs errno: " + str(res))
126        sys.exit(1)
127    res = build_run_e2fsdroid(args)
128    if res != 0:
129        print("error run e2fsdroid errno: " + str(res))
130        os.remove(args.device)
131        sys.exit(2)
132
133
134if __name__ == '__main__':
135    build(sys.argv[1:])
136