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require 'ffi-xattr'
require 'scanf'
require 'time'
module Byteback
class RestoreFile
S_IFMT = 0170000 # bit mask for the file type bit fields
S_IFSOCK = 0140000 # socket
S_IFLNK = 0120000 # symbolic link
S_IFREG = 0100000 # regular file
S_IFBLK = 0060000 # block device
S_IFDIR = 0040000 # directory
S_IFCHR = 0020000 # character device
S_IFIFO = 0010000 # FIFO
S_ISUID = 0004000 # set-user-ID bit
S_ISGID = 0002000 # set-group-ID bit (see below)
S_ISVTX = 0001000 # sticky bit (see below)
S_IRWXU = 00700 # mask for file owner permissions
S_IRUSR = 00400 # owner has read permission
S_IWUSR = 00200 # owner has write permission
S_IXUSR = 00100 # owner has execute permission
S_IRWXG = 00070 # mask for group permissions
S_IRGRP = 00040 # group has read permission
S_IWGRP = 00020 # group has write permission
S_IXGRP = 00010 # group has execute permission
S_IRWXO = 00007 # mask for permissions for others (not in group)
S_IROTH = 00004 # others have read permission
S_IWOTH = 00002 # others have write permission
S_IXOTH = 00001 # others have execute permission
include Comparable
def initialize(full_path, byteback_root=".", now = Time.now)
@full_path = full_path
@byteback_root = byteback_root
@now = now
#
# The snapshot is the first directory after the byteback_root
#
@snapshot = full_path.sub(%r(^#{Regexp.escape @byteback_root}),'').split("/")[1]
#
# If we can parse the time, use it, otherwise assume "now".
#
begin
@snapshot_time = Time.parse(@snapshot)
rescue ArgumentError
@snapshot_time = @now
end
#
# Restore path
#
@path = full_path.sub(%r(^#{Regexp.escape @byteback_root}/#{Regexp.escape @snapshot}),'')
@stat = @mode = @dev_major = @dev_minor = @uid = @gid = nil
end
def <=>(other)
[self.path, self.mtime.to_i, self.size] <=> [other.path, other.mtime.to_i, other.size]
end
def stat
@stat = ::File.lstat(@full_path) unless @stat.is_a?(File::Stat)
@stat
end
def snapshot
@snapshot
end
def snapshot_time
@snapshot_time
end
def path
@path
end
def to_s
sprintf("%10s %i %4i %4i %s %s %s", self.modestring, self.size, self.uid, self.gid, self.mtime.strftime("%b %2d %H:%M"), @snapshot, @path)
end
def read_rsync_xattrs
xattr = Xattr.new(@full_path, :no_follow => false)
rsync_xattrs = xattr["user.rsync.%stat"]
if rsync_xattrs
@mode, @dev_major, @dev_minor, @uid, @gid = rsync_xattrs.scanf("%o %d,%d %d:%d")
raise ArgumentError, "Corrupt rsync stat xattr found for #{@full_path} (#{rsync_xattrs})" unless [@mode, @dev_major, @dev_minor, @uid, @gid].all?{|i| i.is_a?(Integer)}
else
warn "No rsync stat xattr found for #{@full_path}"
@mode, @dev_major, @dev_minor, @uid, @gid = %w(mode dev_major dev_minor uid gid).collect{|m| self.stat.__send__(m.to_sym)}
end
end
def mode
return self.stat.mode if self.stat.symlink?
read_rsync_xattrs unless @mode
@mode
end
def dev_minor
read_rsync_xattrs unless @dev_minor
@dev_minor
end
def dev_major
read_rsync_xattrs unless @dev_major
@dev_major
end
def uid
read_rsync_xattrs unless @uid
@uid
end
def gid
read_rsync_xattrs unless @gid
@gid
end
#
# This returns the type of file as a single character.
#
def ftypelet
if file?
"-"
elsif directory?
"d"
elsif blockdev?
"b"
elsif chardev?
"c"
elsif symlink?
"l"
elsif fifo?
"p"
elsif socket?
"s"
else
"?"
end
end
#
# This returns a modestring from the octal, like drwxr-xr-x.
# This has mostly been copied from strmode from filemode.h in coreutils.
#
def modestring
str = ""
str << ftypelet
str << ((mode & S_IRUSR == S_IRUSR) ? 'r' : '-')
str << ((mode & S_IWUSR == S_IWUSR) ? 'w' : '-')
str << ((mode & S_ISUID == S_ISUID) ?
((mode & S_IXUSR == S_IXUSR) ? 's' : 'S') :
((mode & S_IXUSR == S_IXUSR) ? 'x' : '-'))
str << ((mode & S_IRGRP == S_IRGRP) ? 'r' : '-')
str << ((mode & S_IWGRP == S_IWGRP) ? 'w' : '-')
str << ((mode & S_ISGID == S_ISGID) ?
((mode & S_IXGRP == S_IXGRP) ? 's' : 'S') :
((mode & S_IXGRP == S_IXGRP) ? 'x' : '-'))
str << ((mode & S_IROTH == S_IROTH) ? 'r' : '-')
str << ((mode & S_IWOTH == S_IWOTH) ? 'w' : '-')
str << ((mode & S_ISVTX == S_ISVTX) ?
((mode & S_IXOTH == S_IXOTH) ? 't' : 'T') :
((mode & S_IXOTH == S_IXOTH) ? 'x' : '-'))
return str
end
def socket?
(mode & S_IFMT) == S_IFSOCK
end
def symlink?
self.stat.symlink? || (mode & S_IFMT) == S_IFLNK
end
def file?
(mode & S_IFMT) == S_IFREG
end
def blockdev?
(mode & S_IFMT) == S_IFBLK
end
def directory?
(mode & S_IFMT) == S_IFDIR
end
def chardev?
(mode & S_IFMT) == S_IFCHR
end
def fifo?
(mode & S_IFMT) == S_IFIFO
end
def readlink
if self.stat.symlink?
File.readlink(@full_path)
else
File.read(@full_path).chomp
end
end
def method_missing(m, *args, &blk)
return self.stat.__send__(m) if self.stat.respond_to?(m)
raise NoMethodError, m
end
end
end
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