90 lines
1.7 KiB
Perl
Executable file
90 lines
1.7 KiB
Perl
Executable file
#!/usr/bin/perl
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=encoding utf8
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=head1 NAME
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rrm - record and remove file
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=head1 SYNOPSIS
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B<rrm> I<file>
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=head1 DESCRIPTION
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B<rrm> records a file's MD5sum before removing it. It makes it
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possible to automatically remove the file again should it ever
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reappear.
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This is useful for cleaning up photos where other partial backups of
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the photos are later added: Photos removed once can easily be
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identified and removed automatically if added by the backup.
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=head1 EXAMPLE
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B<rrm> IMG_2035.JPG
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Restore a backup containing I<IMG_2035.JPG>.
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B<rclean>
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B<rclean> will find B<IMG_2035.JPG> as it has the same size and SHA256sum
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as an already removed file.
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=head1 FILES
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The file B<.rrm> contains the database of size, sha256sum, and names of
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the files. It is created in current directory if it cannot be found in
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any of the (grand*)parent directories.
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=head1 SEE ALSO
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B<rclean>(1), B<rm>(1), B<sha256sum>(1)
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=cut
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use Digest::SHA;
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my %size;
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my %hashval;
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my @remove;
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for my $file (@ARGV) {
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if(-s $file > 0) {
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$size{$file} = -s $file;
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my $sha = Digest::SHA->new(256);
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$sha->addfile($file);
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$hashval{$file} = "SHA256:".$sha->b64digest;
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push @remove, $file;
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}
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if(not -e $file) {
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warn("File does not exist: $file");
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}
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}
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$rrmfile = find_rrm_file(".") || ".rrm";
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open(RRM,">>",$rrmfile) || die("Cannot write to $rrmfile.");
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print RRM map { $size{$_}."\t".$hashval{$_}."\t".$_."\0\n" } @remove;
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close RRM;
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unlink @remove;
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sub find_rrm_file {
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my $dir = shift;
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if(-r "$dir/.rrm") {
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return "$dir/.rrm";
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}
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if(join(" ",stat $dir) eq join(" ",stat "../$dir")) {
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# We have reached root dir (.. = .)
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return undef;
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} else {
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return find_rrm_file("../$dir");
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}
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}
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