Implement simple by-hash for apt update

This implements a apt update schema that get the indexfiles by the
hash instead of the name. The rational is that updates to the archive
servers/mirrors are not atomic so the client may have the previous
version of the Release file when the server updates to a new
Release file and new Packages/Sources/Translations indexes. By
keeping the files around by their hash we can still get the previous
indexfile without a hashsum mismatch.

Enable with APT::Acquire::By-Hash=1

1 files changed, 39 insertions, 0 deletions

diff --git a/test/integration/test-apt-by-hash-update b/test/integration/test-apt-by-hash-update
new file mode 100755
index 000000000..6b3032ad6
--- /dev/null
+++ b/test/integration/test-apt-by-hash-update
@@ -0,0 +1,39 @@
+#!/bin/sh
+set -e
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+
+setupenvironment
+configarchitecture "i386"
+
+insertpackage 'unstable' 'foo' 'all' '1.0'
+
+setupaptarchive --no-update
+
+APTARCHIVE=$(readlink -f ./aptarchive)
+
+# make Packages *only* accessable by-hash for this test
+mkdir -p aptarchive/dists/unstable/main/binary-i386/by-hash
+(cd  aptarchive/dists/unstable/main/binary-i386/by-hash && 
+     mv ../Packages* . &&
+     ln -s Packages.gz  $(sha256sum Packages.gz|cut -f1 -d' ') )
+
+# add sources
+mkdir -p aptarchive/dists/unstable/main/source/by-hash
+(cd  aptarchive/dists/unstable/main/source/by-hash && 
+     ln -s ../Sources.gz  $(sha256sum ../Sources.gz|cut -f1 -d' ') 
+)
+
+
+# ensure we do not know about "foo"
+testequal "Reading package lists...
+Building dependency tree...
+E: Unable to locate package foo" aptget install -q -s foo
+
+# ensure we can apt-get update by hash
+testsuccess aptget update -o APT::Acquire::By-Hash=1
+
+# ensure it keeps working
+testequal "Inst foo (1.0 unstable [all])
+Conf foo (1.0 unstable [all])" aptget install -qq -s foo
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