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package urpm::md5sum; # $Id: $
use urpm;
use urpm::util;
use urpm::msg;
#- parse an MD5SUM file from a mirror
sub from_MD5SUM {
my ($md5sum_file, $f) = @_;
my $basename = basename($f);
my ($retrieved_md5sum) = map {
my ($md5sum, $file) = m|(\S+)\s+(?:\./)?(\S+)|;
$file && $file eq $basename ? $md5sum : @{[]};
} cat_($md5sum_file);
$retrieved_md5sum;
}
sub from_MD5SUM__or_warn {
my ($urpm, $md5sum_file, $basename) = @_;
$urpm->{log}(N("examining %s file", $md5sum_file));
my $retrieved_md5sum = from_MD5SUM($md5sum_file, $basename)
or $urpm->{log}(N("warning: md5sum for %s unavailable in MD5SUM file", $basename));
return $retrieved_md5sum;
}
sub on_local_medium {
my ($urpm, $medium, $force) = @_;
if ($force) {
#- force downloading the file again, else why a force option has been defined ?
delete $medium->{md5sum};
} else {
$medium->{md5sum} ||= compute_on_local_medium($urpm, $medium);
}
$medium->{md5sum};
}
sub compute_on_local_medium {
my ($urpm, $medium) = @_;
require urpm; #- help perl_checker
my $f = urpm::statedir_hdlist_or_synthesis($urpm, $medium);
$urpm->{log}(N("computing md5sum of existing source hdlist (or synthesis) [%s]", $f));
-e $f && compute($f);
}
sub compute {
my ($file) = @_;
eval { require Digest::MD5 };
if ($@) {
#- Use an external command to avoid depending on perl
return (split ' ', `/usr/bin/md5sum '$file'`)[0];
} else {
my $ctx = Digest::MD5->new;
open my $fh, $file or return '';
$ctx->addfile($fh);
close $fh;
return $ctx->hexdigest;
}
}
1;
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