> > I am trying to make apt always run debsums_gen on the just-installed
> > packages. I think it should be possible, but the apt.conf manpage is
> > terrible :( Can anyone give me an example of a setup where some
> > nontrivial shell code runs that way?
Matt> Neither is a shell script, but take a look at dpkg-preconfigure
Matt> for a simple example, or apt-listchanges for a more complex one.
Michael> If you glean some useful information from them, can you
Michael> please send in patches to the manpage?
About the manpage: I don't know if it can be patched, more like
rewritten. I will have a stab at it someday. The two general
problems are: it doesn't document the format precisely (it is
certainly NOT perl, with // comments) and the part about how apt
actually calls it is hardly comprehensible at least to an outsider
(what's the difference between Pre-Install-Pkgs and Pre-Invoke, for
example?)
Another thing is that debsums_gen is broken by itself, so I had to
roll my own. Colin: your code is probably better and faster, but I
really wanted to fix md5sums rather than introduce a new mechanism.
Here's what I ended up doing:
in /etc/apt/apt.conf.d/80/80md5sums
// Massage packages that omit a md5sums file.
// If you don't like it, comment it out.
DPkg::Pre-Install-Pkgs {"xargs /usr/local/sbin/md5sums_deb";};
and this is /usr/local/sbin/md5sums_deb:
#! /usr/bin/perl
use Digest::MD5;
use FileHandle;
use File::Temp qw(tempdir);
use File::Find;
our %conffiles = ();
sub wanted {
$File::Find::prune = 1 if ($File::Find::name eq "$debdir/etc"
or $File::Find::name eq "$debdir/DEBIAN");
return unless (-f $File::Find::name);
my $relname = $File::Find::name;
$relname =~ s{^\Q$debdir/}{};
return if $conffiles{$relname};
my $debfile = FileHandle->new;
$debfile->open("<$File::Find::name") or die "$File::Find::name: $! \n";
my $md5_ctx = Digest::MD5->new;
$md5_ctx->addfile($debfile);
my $md5_hash = $md5_ctx->hexdigest();
$debfile->close();
$md5sums->printf("%s %s\n", $md5_hash, $relname);
}
exit 0 if ($#ARGV < 0);
DEB:
foreach my $deb (@ARGV) {
local $debdir = tempdir( CLEANUP => 1 );
$debdir or die "$! \n";
system("dpkg-deb --extract $deb $debdir") == 0
or die "dpkg-deb exited with status $? \n";
system("dpkg-deb --control $deb $debdir/DEBIAN") == 0
or die "dpkg-deb exited with status $? \n";
next DEB if (-f "$debdir/DEBIAN/md5sums");
printf("%s missing md5sums, generating...", $deb);
if (-f "$debdir/DEBIAN/conffiles") {
my $conffiles = FileHandle->new;
$conffiles->open("<$debdir/DEBIAN/conffiles")
or die "$debdir/DEBIAN/conffiles: $! \n";
foreach my $conffile ($conffiles->getlines()) {
$conffile =~ s{^/(.*)}{$1};
$conffiles{$conffile} = 1;
}
$conffiles->close();
}
local $md5sums = FileHandle->new;
$md5sums->open(">$debdir/DEBIAN/md5sums")
or die "$debdir/DEBIAN/md5sums: $! \n";
File::Find::find(\&wanted, $debdir) ;
$md5sums->close();
printf("done.\n");
system("dpkg-deb --build $debdir $deb") == 0
or die "dpkg-deb exited with status $? \n";
}
--
Ian Zimmerman, Oakland, California, U.S.A.
GPG: 433BA087 9C0F 194F 203A 63F7 B1B8 6E5A 8CA3 27DB 433B A087
EngSoc adopts market economy: cheap is wasteful, efficient is expensive.
