fix: do not depend on git-lfs being installed during git clone

The current git-lfs integration runs `git lfs pull` after the normal
git operations. We therefore setup the git repositories to essentially
do nothing on clone/fetch/pull/...

However, the way this is done so far is by using the `--skip` options
to git-lfs ... which relies on git-lfs itself. This is a problem
on platforms where installing git-lfs is an issue.

Use pass-through filters that do not rely on git-lfs during cloning
instead. The "real" setup is done after the import anyways.

lib/autobuild/import/git-lfs.rb

@@ -1,8 +1,11 @@
 # Disable git-lfs at checkout time, we run install --local and pull later
-Autobuild::Git.default_config['filter.lfs.smudge'] = 'git-lfs smudge --skip -- %f'
-Autobuild::Git.default_config['filter.lfs.required'] = 'false'
-
 module Autobuild
+    GIT_NOOP_FILTER = File.join(__dir__, "git-noop-filter")
+    Git.default_config['filter.lfs.smudge'] = "cat"
+    Git.default_config['filter.lfs.clean'] = "cat"
+    Git.default_config["filter.lfs.process"] = GIT_NOOP_FILTER
+    Git.default_config['filter.lfs.required'] = 'false'
+
     def self.lfs_setup(importer, package)
         importer.run_git(package, 'lfs', 'install', '--force', '--local', '--skip-smudge')
 

lib/autobuild/import/git-noop-filter

@@ -0,0 +1,134 @@
+#!/usr/bin/perl
+#
+# Example implementation for the Git filter protocol version 2
+# See Documentation/gitattributes.txt, section "Filter Protocol"
+#
+# Please note, this pass-thru filter is a minimal skeleton. No proper
+# error handling was implemented.
+#
+
+use strict;
+use warnings;
+
+my $MAX_PACKET_CONTENT_SIZE = 65516;
+
+sub packet_bin_read {
+	my $buffer;
+	my $bytes_read = read STDIN, $buffer, 4;
+	if ( $bytes_read == 0 ) {
+
+		# EOF - Git stopped talking to us!
+		exit();
+	}
+	elsif ( $bytes_read != 4 ) {
+		die "invalid packet: '$buffer'";
+	}
+	my $pkt_size = hex($buffer);
+	if ( $pkt_size == 0 ) {
+		return ( 1, "" );
+	}
+	elsif ( $pkt_size > 4 ) {
+		my $content_size = $pkt_size - 4;
+		$bytes_read = read STDIN, $buffer, $content_size;
+		if ( $bytes_read != $content_size ) {
+			die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
+		}
+		return ( 0, $buffer );
+	}
+	else {
+		die "invalid packet size: $pkt_size";
+	}
+}
+
+sub packet_txt_read {
+	my ( $res, $buf ) = packet_bin_read();
+	unless ( $buf =~ s/\n$// ) {
+		die "A non-binary line MUST be terminated by an LF.";
+	}
+	return ( $res, $buf );
+}
+
+sub packet_bin_write {
+	my $buf = shift;
+	print STDOUT sprintf( "%04x", length($buf) + 4 );
+	print STDOUT $buf;
+	STDOUT->flush();
+}
+
+sub packet_txt_write {
+	packet_bin_write( $_[0] . "\n" );
+}
+
+sub packet_flush {
+	print STDOUT sprintf( "%04x", 0 );
+	STDOUT->flush();
+}
+
+( packet_txt_read() eq ( 0, "git-filter-client" ) ) || die "bad initialize";
+( packet_txt_read() eq ( 0, "version=2" ) )         || die "bad version";
+( packet_bin_read() eq ( 1, "" ) )                  || die "bad version end";
+
+packet_txt_write("git-filter-server");
+packet_txt_write("version=2");
+packet_flush();
+
+( packet_txt_read() eq ( 0, "capability=clean" ) )  || die "bad capability";
+( packet_txt_read() eq ( 0, "capability=smudge" ) ) || die "bad capability";
+( packet_txt_read() eq ( 0, "capability=delay" ) ) || die "bad capability";
+my ( $res, $buf ) = packet_bin_read();
+( $buf eq ( 1, "" ) )                  || die "bad capability end $buf";
+
+packet_txt_write("capability=clean");
+packet_txt_write("capability=smudge");
+packet_flush();
+
+while (1) {
+	my ($command)  = packet_txt_read() =~ /^command=(.+)$/;
+	my ($pathname) = packet_txt_read() =~ /^pathname=(.+)$/;
+
+	if ( $pathname eq "" ) {
+		die "bad pathname '$pathname'";
+	}
+
+	packet_bin_read();
+
+	my $input = "";
+	{
+		binmode(STDIN);
+		my $buffer;
+		my $done = 0;
+		while ( !$done ) {
+			( $done, $buffer ) = packet_bin_read();
+			$input .= $buffer;
+		}
+	}
+
+	my $output;
+	if ( $command eq "clean" ) {
+		### Perform clean here ###
+		$output = $input;
+	}
+	elsif ( $command eq "smudge" ) {
+		### Perform smudge here ###
+		$output = $input;
+	}
+	else {
+		die "bad command '$command'";
+	}
+
+	packet_txt_write("status=success");
+	packet_flush();
+	while ( length($output) > 0 ) {
+		my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
+		packet_bin_write($packet);
+		if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
+			$output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
+		}
+		else {
+			$output = "";
+		}
+	}
+	packet_flush();    # flush content!
+	packet_flush();    # empty list, keep "status=success" unchanged!
+
+}