diff options
Diffstat (limited to 'util/copy-if-different.pl')
-rw-r--r-- | util/copy-if-different.pl | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/util/copy-if-different.pl b/util/copy-if-different.pl new file mode 100644 index 0000000000..ec99e084b5 --- /dev/null +++ b/util/copy-if-different.pl @@ -0,0 +1,78 @@ +#!/usr/local/bin/perl + +use strict; + +use Fcntl; + +# copy-if-different.pl + +# Copy to the destination if the source is not the same as it. + +my @filelist; + +foreach my $arg (@ARGV) { + $arg =~ s|\\|/|g; # compensate for bug/feature in cygwin glob... + foreach (glob $arg) + { + push @filelist, $_; + } +} + +my $fnum = @filelist; + +if ($fnum <= 1) + { + die "Need at least two filenames"; + } + +my $dest = pop @filelist; + +if ($fnum > 2 && ! -d $dest) + { + die "Destination must be a directory"; + } + +foreach (@filelist) + { + my $dfile; + if (-d $dest) + { + $dfile = $_; + $dfile =~ s|^.*[/\\]([^/\\]*)$|$1|; + $dfile = "$dest/$dfile"; + } + else + { + $dfile = $dest; + } + + my $buf; + if (-f $dfile) + { + sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_"; + sysopen(OUT, $dfile, O_RDONLY|O_BINARY) + || die "Can't Open $dfile"; + while (sysread IN, $buf, 10240) + { + my $b2; + goto copy if !sysread(OUT, $b2, 10240) || $buf ne $b2; + } + goto copy if sysread(OUT, $buf, 1); + close(IN); + close(OUT); + print "NOT copying: $_ to $dfile\n"; + next; + } + copy: + sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_"; + sysopen(OUT, $dfile, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY) + || die "Can't Open $dfile"; + while (sysread IN, $buf, 10240) + { + syswrite(OUT, $buf, length($buf)); + } + close(IN); + close(OUT); + print "Copying: $_ to $dfile\n"; + } + |