direct/python/yaffs_importer.py

   1 import os
   2 from yaffsfs import *
   3 import sys
   4 import ctypes
   5
   6
   7 #dir_in_snapshot=[]
   8 #files_in_snapshot=[]
   9 #symlinks_in_snapshot=[]
  10 #unknown_in_snapshot=[]
  11 #is_mount_in_snapshot=[]
  12 def check_for_yaffs_errors(output):
  13     if output<0:
  14         ##error has happened
  15         error=ctypes.c_int()
  16         error=yaffs_get_error()
  17         debug_message("error######################################",0)
  18         debug_message(("error code", error),  0)
  19
  20 def debug_message(message, debug_level):
  21     """notew that debug level 0 will always be printed"""
  22     """level 0 error messages"""
  23     """level 1 basic tasks are shown(creating, deleating,ect)"""
  24     """level 2 all process are shown"""
  25     """level 3 shows minor tasks such as join_paths, ect"""
  26     """level 4 is used for bug hunting and shows each step in detail"""
  27     if current_debug_level>=debug_level:
  28 #        for i in range(0, len(message)):
  29 #            print message,
  30 #        print"\n \n \n"
  31         print message
  32 def join_paths(path1, path2):
  33     new_path=path1
  34     if path1[len(path1)-1]=="/"and path2[0]=="/":
  35         new_path+=path2[1:]
  36     elif path1[len(path1)-1]!="/"and path2[0]!="/":
  37         new_path+="/"
  38         new_path+=path2
  39     else:
  40         new_path+=path2
  41
  42     debug_message(("adding path ", path1, " to ",  path2, " resulting path: ", new_path), 3)
  43     return new_path
  44
  45 def subtract_paths(path1, path2):
  46     if len(path1)>len(path2):
  47         if path1[len(path1)-1]!="/":
  48             path1 +="/"
  49         if path2[len(path2)-1]!="/":
  50             path2 += "/"
  51         debug_message("the two path1 is longer than path2 and can therefore be subtracted.", 4)
  52         ##if the two paths are diretly subtractable
  53         if path1[0:len (path2)-1]==path2:
  54             debug_message("the two paths are direcly subtractable", 4)
  55             new_path=path1[len(path2):]
  56         elif path1[1:len (path2)-1]==path2:
  57             debug_message("the path1 has one more charecter at the begining. assuming that the first chareter is a slash", 4)##fix this assumption.
  58             new_path=path1[len(path2)+1:]
  59         elif path1[1:len (path2)]==path2[1:]:
  60             debug_message("the path2 has one more charecter at the begining. assuming that the first chareter is a slash", 4)##fix this assumption.
  61
  62             new_path=path1[len(path2)-1:]
  63         else :
  64             debug_message("error:could not subtract paths", 0)
  65             debug_message( ("paths do not match:"+ path1+ "  "+path2), 0)
  66             return 0
  67     else :
  68         debug_message( ("cannot subtract path2(:", path2, ") from path1(", path1, ")because path 2 is too long"), 0)
  69
  70         return 0
  71     debug_message(("subtracting paths ", path2, " from ",  path1, " resulting path: ", new_path), 3)
  72     return new_path
  73
  74 def create_file(file):
  75     debug_message( "\n \n \n", 2)
  76     file_path= join_paths(yaffs_root_dir_path, file["path"][len(path):])
  77     debug_message( ("creating file:", file_path), 2)
  78     debug_message (("mode", file["mode"]), 2)
  79     debug_message("opening file",2)
  80 #    yaffs_ls(file["path"])
  81
  82     ##if there is already a file in yaffs then remove the file . this is to prevent yaffs from opening a nd writing to a read only file
  83     if yaffs_access(file_path, 0)==0:##the 0 means does it exist.
  84         debug_message ("file already exists in yaffs", 2)
  85         output=yaffs_unlink(file_path)
  86         debug_message(("unlinking", file_path, output), 2)
  87         check_for_yaffs_errors(output)
  88
  89     current_handle=yaffs_open(file_path, yaffs_O_CREAT | yaffs_O_TRUNC| yaffs_O_RDWR, yaffs_S_IREAD | yaffs_S_IWRITE)  ##opens a file with mode set to write
  90     debug_message(("current_handle", current_handle), 2)
  91     data_file=open(file["path"], "r")
  92     output=yaffs_lseek(current_handle, 0, 0)
  93     if output==-1:
  94         debug_message("error with yaffs lseeking", 2)
  95
  96         check_for_yaffs_errors(output)
  97     data_to_be_written= data_file.read()
  98
  99
 100     length_of_file=len(data_to_be_written)
 101     debug_message (("length of data to be written",length_of_file), 2)
 102     output=yaffs_write(current_handle,data_to_be_written , length_of_file)
 103     if output>=0:
 104         debug_message(( "writing file:", output), 2)
 105     else :
 106         debug_message(( "error writing file:", output), 0)
 107         check_for_yaffs_errors(output)
 108     output=yaffs_ftruncate(current_handle, length_of_file)
 109     if output>=0:
 110         debug_message(( "truncating file:", output), 2)
 111     else :
 112         debug_message(( "error truncating file:", output), 0)
 113         check_for_yaffs_errors(output)
 114     output=yaffs_close(current_handle)
 115     if output>=0:
 116         debug_message(( "closing file:", output), 2)
 117     else :
 118         debug_message(( "error closing file:", output), 0)
 119         check_for_yaffs_errors(output)
 120     ##changes the mode of the yaffs file to be the same as the scanned file
 121     yaffs_chmod(file_path, file["mode"]);
 122     if output>=0:
 123         debug_message(( "chmoding file:", output), 2)
 124     else :
 125         debug_message(( "error chmoding file:", output), 0)
 126         check_for_yaffs_errors(output)
 127
 128
 129
 130 def create_dir(dir, scanned_path, yaffs_path):
 131     debug_message( "\n \n \n", 2)
 132     absolute_dir_path=join_paths(yaffs_path, subtract_paths(dir["path"],scanned_path))
 133     debug_message( ("creating dir:", absolute_dir_path), 2)
 134     debug_message (("mode(in octal", oct(dir["mode"])), 2)
 135
 136
 137     ##if there is already a dir in yaffs then remove the dir . this is to clean the yaffs folder if it already exists.
 138     if yaffs_access(absolute_dir_path, 0)==0:##the 0 means does it exist.
 139         debug_message ("folder already exists in yaffs", 2)
 140         output=yaffs_unlink(absolute_dir_path)
 141         debug_message(("unlinking", absolute_dir_path, output), 2)
 142         check_for_yaffs_errors(output)
 143
 144     ##shis is a bug in yaffs which will not make a dir if there is a slash on the end
 145     if absolute_dir_path[len(absolute_dir_path)-1]=="/":
 146         absolute_dir_path=absolute_dir_path[0:len(absolute_dir_path)-1]
 147         debug_message (("path has slash on the end. removing slash new path is:",absolute_dir_path) , 4)
 148
 149     output=yaffs_mkdir(absolute_dir_path, dir["mode"] )
 150     if output>=0:
 151         debug_message(( "creating dir:", output), 2)
 152     else :
 153         debug_message(( "error creating dir:", output), 0)
 154         check_for_yaffs_errors(output)
 155
 156
 157
 158
 159 def remove_file_from_path(path):
 160     slash_id=[]
 161     for i in range(0, len(path)):
 162         if path[i]=="/":
 163             slash_id.append(i)
 164     new_path=path[:slash_id[len(slash_id)-1]]
 165     debug_message( ("removed file from path", new_path), 2)
 166     return new_path
 167
 168 def is_dir_hidden(dir):
 169     """this code tests if a directory is hidden (has a ./<name> format) and returns true if it is hidden"""
 170     slash_id=[]
 171     for i in range(0, len(dir)):
 172         if dir[i]=="/":
 173             slash_id.append(i)
 174
 175     if dir[slash_id[len(slash_id)-1]+1]==".":
 176         return True
 177     else :
 178         return False
 179
 180 def scan_dir(path, search_hidden_directories=True, ):
 181     """this function scans all of the files and directories in a directory. The function then calls its self on any of the directories that it found. this causes it to build up a tree of all the files and directories """
 182     files_in_snapshot=[]
 183     symlinks_in_snapshot=[]
 184     dir_in_snapshot=[]
 185     dir_in_current_dir=[]
 186     unknown_in_snapshot=[]
 187     if os.path.exists(path)==False:
 188         debug_message ("error#############################",0)
 189         debug_message (("path:", path, "  doesnot exist"), 0)
 190         return 0
 191     dir_snapshot=os.listdir(path)
 192     for i in range(0, len(dir_snapshot)):
 193
 194         current_snapshot=os.path.join(path, dir_snapshot[i])
 195         debug_message (("current snapshot:", current_snapshot), 2)
 196         isDir=os.path.isdir(current_snapshot)
 197         isFile=os.path.isfile(current_snapshot)
 198         isLink=os.path.islink(current_snapshot)
 199         isMount=os.path.ismount(current_snapshot)
 200
 201         stat=os.lstat(current_snapshot)
 202
 203         ##note the order of these if and elif statemens is importaint since a file can be symbloic link and a file
 204         if isDir:
 205             if search_hidden_directories==True or (is_dir_hidden(current_snapshot) ==False or search_hidden_directories==True ) :
 206 #                st_mode ##mode of the folder read/write ect
 207                 dir_in_snapshot.append({"path":current_snapshot, "mode":stat.st_mode})
 208                 dir_in_current_dir.append(current_snapshot)
 209             else :
 210                 debug_message( ("file is hidden so it is ingored", current_snapshot,), 1)
 211         elif  isLink:
 212
 213             ##for some reason the os.readlink only gives the target link realative to the directory which the symbloic link is in. change this into a absolute path
 214             x=current_snapshot
 215             x=remove_file_from_path(x)
 216             target=join_paths(x,os.readlink(current_snapshot) )
 217             symlinks_in_snapshot.append({"path":current_snapshot, "target":target})
 218         elif isFile:
 219
 220 #            stat.st_ino ##inode number
 221 #            st_nlink ##number of hard links to this file
 222 #            st_size ##size of file
 223             files_in_snapshot.append({"path":current_snapshot, "inode": stat.st_ino, "size":stat.st_size, "num_of_hardlinks":stat.st_nlink, "mode":stat.st_mode})
 224
 225 #        elif isMount:
 226 #            is_mount_in_snapshot.append(current_snapshot)
 227         else:
 228             unknown_in_snapshot.append(current_snapshot)
 229
 230     for i in range(0, len(dir_in_current_dir)):
 231         scan_dir(dir_in_current_dir[i])
 232     return (files_in_snapshot, dir_in_snapshot, symlinks_in_snapshot, unknown_in_snapshot)
 233 ##
 234 ##def print_scanned_dir_list():
 235 ##    global files_in_snapshot
 236 ##    global symlinks_in_snapshot
 237 ##    print( "scanning dir", 2)
 238 ##
 239 ##
 240 ##    for i in range(0, len(files_in_snapshot)):
 241 ##        if files_in_snapshot[i]["num_of_hardlinks"]>1:
 242 ##            print "inode",files_in_snapshot[i]["inode"],"size",files_in_snapshot[i]["size"],"path:", files_in_snapshot[i]["path"], "    num of hard links",  files_in_snapshot[i]["num_of_hardlinks"]
 243 ##
 244 ##        else :
 245 ##            print "inode",files_in_snapshot[i]["inode"],"size",files_in_snapshot[i]["size"],"path:", files_in_snapshot[i]["path"]
 246 ###        current_open_file=open(files_in_snapshot[i], "r")
 247 ###        #current_open_file.f.read(3)
 248 ###        lines_in_file=current_open_file.readlines()
 249 ###        #use for loop to write code into yaffs file
 250 ###        print "number of line of code:", len(lines_in_file)
 251 ###    print current_open_file
 252 ##    for i in range(0, len(symlinks_in_snapshot)):
 253 ##        print "symlinks in snapshot:", symlinks_in_snapshot[i]
 254 ##    for i in range(0, len(dir_in_snapshot)):
 255 ##        print "directories in snapshot:", dir_in_snapshot[i]
 256 ##    for i in range(0, len(unknown_in_snapshot)):
 257 ##        print "unknown objects in snapshot:", unknown_in_snapshot[i]
 258 ##
 259
 260
 261 def copy_scanned_files_into_yaffs(files_in_snapshot, dir_in_snapshot,  symlinks_in_snapshot, unknown_in_snapshot,   path, yaffs_root_dir_path="/yaffs2/", yaffs_mount_point_path="/yaffs2/" ):
 262 #files_in_snapshot, dir_in_snapshot, symlinks_in_snapshot, unknown_in_snapshot
 263 #########################################copy directories into yaffs so the files can be created in these directories
 264     debug_message("making directories in yaffs", 1)
 265     if yaffs_root_dir_path!=yaffs_mount_point_path:
 266         slash_id=[]
 267         debug_message("making directories to the place in yaffs where the directories will copied to", 2)
 268         root_branch_path=subtract_paths(yaffs_root_dir_path, yaffs_mount_point_path)
 269         for i in range(0, len(root_branch_path)):
 270
 271             if root_branch_path[i]=="/" and i != 0:
 272                slash_id.append(i)
 273         debug_message(("slash_id", slash_id),4)
 274         for i in range(0, len(slash_id)):
 275             create_dir({"path":root_branch_path[:slash_id[i]], "mode": yaffs_S_IREAD | yaffs_S_IWRITE}, "/", yaffs_mount_point_path)
 276
 277     for i in range(0, len(dir_in_snapshot)):
 278         create_dir(dir_in_snapshot[i], path, yaffs_root_dir_path)
 279
 280
 281
 282 #########################################copy file into yaffs
 283     debug_message("copying scanned files into yaffs", 1)
 284     list=[]
 285     inode_blacklist=[]
 286
 287     debug_message("files to be copyied into yaffs", 2)
 288     for a in range(0, len(files_in_snapshot)):
 289         debug_message(files_in_snapshot[a], 2)
 290     debug_message("\n\n\n", 2)
 291     for i in range(0, len(files_in_snapshot)):
 292         list=[]
 293         if files_in_snapshot[i]["num_of_hardlinks"]>1 and files_in_snapshot[i]["inode"] not in inode_blacklist :
 294             debug_message("found a hard link", 2)
 295             debug_message(("inode",files_in_snapshot[i]["inode"],"size",files_in_snapshot[i]["size"],"path:", files_in_snapshot[i]["path"], "    num of hard links",  files_in_snapshot[i]["num_of_hardlinks"] ), 2)
 296             for a in range(0, len(files_in_snapshot) ) :
 297                 if files_in_snapshot[a]["inode"] ==files_in_snapshot[i]["inode"]  :
 298                     ##and os.path.isfile(files_in_snapshot[i])
 299                     debug_message(("found this file which matches inode",files_in_snapshot[a]), 2)
 300                     list.append(files_in_snapshot[a])
 301                     debug_message(("length of list", len(list)), 2)
 302                 if len(list)==files_in_snapshot[i]["num_of_hardlinks"]:
 303                     break
 304             for a in range(0, len(list)):
 305                 debug_message(list[a], 2)
 306             ##add inode to blacklist. all of the indoes in the list should be the same.
 307             inode_blacklist.append(list[0]["inode"])
 308             ##create a file from the first hardlink.
 309             create_file(list[0])
 310             target_path=yaffs_root_dir_path+list[0]["path"][len(path):]
 311             for i in range(1, len(list)):
 312                 debug_message("creating_symlink", 2)
 313                 debug_message(("target path", target_path), 2)
 314                 hardlink_path=yaffs_root_dir_path+list[i]["path"][len(path):]
 315                 debug_message(("hardlink path", hardlink_path), 2)
 316                 output=yaffs_link(target_path,hardlink_path)
 317                 debug_message(("creating hardlink:", list[i]["path"], "output:", output), 1)
 318         elif files_in_snapshot[i]["inode"] not in inode_blacklist :
 319             create_file(files_in_snapshot[i])
 320
 321
 322 ############################copy symlinks into yaffs
 323
 324     for i in range(0, len(symlinks_in_snapshot)):
 325         debug_message(("symlinks in snapshot:", symlinks_in_snapshot[i]), 2)
 326         target_path=join_paths(yaffs_root_dir_path, subtract_paths(symlinks_in_snapshot[i]["target"],  path))
 327         new_path=join_paths(yaffs_root_dir_path, subtract_paths(symlinks_in_snapshot[i]["path"], path))
 328         output=yaffs_symlink(target_path, new_path)
 329         debug_message(("created symlink",new_path , " > ", target_path, "  output:", output), 1)
 330         ##yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath);
 331
 332
 333     for i in range(0, len(unknown_in_snapshot)):
 334         debug_message( ("unknown object in snapshot:", unknown_in_snapshot[i]), 0)
 335
 336
 337 def import_into_yaffs(file_path, yaffs_path="/yaffs2/", debug_level=1,  copy_hidden_dir=True ,new_yaffs_trace_val=0 ):
 338 #    global current_debug_level
 339 #    global search_hidden_directories
 340 #    global yaffs_root_dir_path
 341 #    global path
 342
 343 #    current_debug_level=debug_level
 344 #    search_hidden_directories=copy_hidden_dir
 345 #    yaffs_root_dir_path=yaffs_path
 346 #    path=file_path
 347     old_yaffs_trace_val=yaffs_get_trace()
 348     yaffs_set_trace(new_yaffs_trace_val)
 349
 350     data=scan_dir(file_path, copy_hidden_dir)
 351     copy_scanned_files_into_yaffs(data[0], data[1], data[2], data[3],file_path,  yaffs_path)
 352
 353     yaffs_set_trace(old_yaffs_trace_val)
 354
 355
 356 if __name__=="__main__":
 357     yaffs_StartUp()
 358     yaffs_mount("/yaffs2/")
 359     yaffs_set_trace(0)
 360 #    absolute_path = os.path.abspath(os.path.curdir)
 361     #print "absolute path:", absolute_path
 362     current_debug_level=1
 363     search_hidden_directories=True
 364     yaffs_root_dir_path="/yaffs2/scanning/"
 365     #print sys.argv
 366     path=sys.argv[1]
 367     for i in range(2, len(sys.argv)):
 368         if sys.argv[i]=="-d":
 369             current_debug_level=int( sys.argv[i+1])
 370         if sys.argv[i]=="-ignore_hidden_directories":
 371             search_hidden_directories=False
 372 #
 373 #
 374 #    path="/home/timothy/work/yaffs/git/yaffs2"
 375 #    path="/home/timothy/my_stuff/old_laptop/timothy/programming_lejos/"
 376
 377
 378     import_into_yaffs(path, yaffs_root_dir_path, current_debug_level,  search_hidden_directories, 0 )
 379 #    scan_dir(path)
 380 #    copy_scanned_files_into_yaffs()
 381     #print_scanned_dir_list()
 382
 383     print"unmounting yaffs:", yaffs_unmount("/yaffs2/")