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comparison g23m/system/busyb/tools/verify_target_file.pl @ 0:509db1a7b7b8

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initial import: leo2moko-r1
author Space Falcon <falcon@ivan.Harhan.ORG>
date Mon, 01 Jun 2015 03:24:05 +0000
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-1:000000000000 0:509db1a7b7b8
1 #
2 # verify_target_file.pl
3 #
4 # tool to check for make-like dependency
5 #
6 # format: verify_target_file.pl temp-file other-dest-file-index other-command other-parameters
7 #
8 # the intention of this command is to modify conditionally a file, as would it
9 # have done by make. since there is no date information, the tool uses the
10 # content of the file.
11 #
12 # the behaviour of this script is somehow specific:
13 # - it expects that other-dest-file-index decribes which parameter of
14 # other-parameters describes the file to be generated. first parameter is
15 # described with 0 etc. other-command is a perl script and will be invoked
16 # with "do".
17 # - it invokes other-command, but replaces the first parameter with temp-file
18 # - it then verifies temp-file against the expected result file (the first
19 # parameter). if this file does not exist or is different to temp-file,
20 # temp-file is renamed to the first parameter. otherwise (file exists and
21 # its content is equal to the content of temp-file), only the temp-file is
22 # removed.
23 # - since the file is already so special, it brings its own comparison tool,
24 # that way there is no need to install anything else, that tool compares
25 # text files
26 #
27 # IMPORTANT:
28 # since the used rename does not rename over file system boundaries (at least
29 # it is not promised), choose your temp-file accordingly
30 #
31
32 use strict;
33 #use warnings;
34
35 my $temp_file = shift;
36 my $other_dest_file_index = shift;
37 my $other_command = shift;
38 my $other_dest_file = $ARGV[$other_dest_file_index];
39
40 # modify command_line
41 $ARGV[$other_dest_file_index] = $temp_file;
42
43 my $result = do $other_command;
44
45 if ((! defined $result) && ($! || $@))
46 {
47 die "system $other_command failed: $!\n$@";
48 }
49
50 if (! -e $temp_file)
51 {
52 #something unexpected occured
53 die "$temp_file should have been generated";
54 }
55
56 if (( ! -e $other_dest_file ) ||
57 compare_files($other_dest_file, $temp_file) == 0)
58 {
59 unlink $other_dest_file;
60 rename $temp_file, $other_dest_file;
61 }
62 else
63 {
64 unlink $temp_file;
65 }
66
67 sub get_contents_of_file
68 {
69 my ($filename) = @_;
70
71 open(FILE, "<$filename") or die "open failed: $filename";
72 my @lines = <FILE>;
73 my $text = join '', @lines;
74 close FILE;
75
76 $text
77 }
78
79 sub compare_files
80 {
81 my ($file1, $file2) = @_;
82
83 get_contents_of_file($file1) eq get_contents_of_file($file2)
84 }
85