source: mainline/tools/mktmpfs.py@ 78eb2dc

#!/usr/bin/env python
#
# Copyright (c) 2008 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

"""
TMPFS creator
"""

import sys
import os
import xstruct
from imgutil import listdir_items, chunks

HEADER = """little:
        char tag[5]  /* 'TMPFS' */
"""

DENTRY_NONE = """little:
        uint8_t kind        /* NONE */
        uint32_t fname_len  /* 0 */
"""

DENTRY_FILE = """little:
        uint8_t kind        /* FILE */
        uint32_t fname_len  /* filename length */
        char fname[%d]      /* filename */
        uint32_t flen       /* file length */
"""

DENTRY_DIRECTORY = """little:
        uint8_t kind        /* DIRECTORY */
        uint32_t fname_len  /* filename length */
        char fname[%d]      /* filename */
"""

TMPFS_NONE = 0
TMPFS_FILE = 1
TMPFS_DIRECTORY = 2

def usage(prname):
        "Print usage syntax"
        print(prname + " <PATH> <IMAGE>")

def recursion(root, outf):
        "Recursive directory walk"
        
        for item in listdir_items(root):                
                if item.is_file:                        
                        dentry = xstruct.create(DENTRY_FILE % len(item.name))
                        dentry.kind = TMPFS_FILE
                        dentry.fname_len = len(item.name)
                        dentry.fname = item.name.encode('ascii')
                        dentry.flen = item.size
                        
                        outf.write(dentry.pack())
                        
                        for data in chunks(item, 4096):
                                outf.write(data)
                
                elif item.is_dir:
                        dentry = xstruct.create(DENTRY_DIRECTORY % len(item.name))
                        dentry.kind = TMPFS_DIRECTORY
                        dentry.fname_len = len(item.name)
                        dentry.fname = item.name.encode('ascii')
                        
                        outf.write(dentry.pack())
                        
                        recursion(item.path, outf)
                        
                        dentry = xstruct.create(DENTRY_NONE)
                        dentry.kind = TMPFS_NONE
                        dentry.fname_len = 0
                        
                        outf.write(dentry.pack())

def main():
        if (len(sys.argv) < 3):
                usage(sys.argv[0])
                return
        
        path = os.path.abspath(sys.argv[1])
        if (not os.path.isdir(path)):
                print("<PATH> must be a directory")
                return
        
        outf = open(sys.argv[2], "wb")
        
        header = xstruct.create(HEADER)
        header.tag = b"TMPFS"
        
        outf.write(header.pack())
        
        recursion(path, outf)
        
        dentry = xstruct.create(DENTRY_NONE)
        dentry.kind = TMPFS_NONE
        dentry.fname_len = 0
        
        outf.write(dentry.pack())
        
        outf.close()
        
if __name__ == '__main__':
        main()