implement Fallback-Of for IndexTargets

Sometimes index files are in different locations in a repository as it
is currently the case for Contents files which are per-component in
Debian, but aren't in Ubuntu. This has historic reasons and is perhaps
changed soon, but such cases of transitions can always happen in the
future again, so we should prepare:

Introduced is a new field declaring that the current item should only be
downloaded if the mentioned item wasn't allowing for transitions without
a flagday in clients and archives.

This isn't implemented 'simpler' with multiple MetaKeys as items (could)
change their descriptions and perhaps also other configuration bits with
their location.

1 files changed, 58 insertions, 0 deletions

diff --git a/test/integration/test-apt-acquire-additional-files b/test/integration/test-apt-acquire-additional-files
index 3420aa29d..0b81845af 100755
--- a/test/integration/test-apt-acquire-additional-files
+++ b/test/integration/test-apt-acquire-additional-files
@@ -158,6 +158,64 @@ rm ./rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Cont
 testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents'
 runthistest
 
+msgmsg "Contents with 3 MetaKeys, first match"
+rm ./rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-amd64.gz
+rm ./rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-all.gz
+testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents'
+cat > rootdir/etc/apt/apt.conf.d/content-target.conf <<EOF
+Acquire::IndexTargets::deb::Contents3 {
+	MetaKey "main/Contents-all";
+	ShortDescription "Contents3";
+	Description "\$(RELEASE) all Contents3";
+	Fallback-Of "Contents2";
+};
+Acquire::IndexTargets::deb::Contents {
+	MetaKey "\$(COMPONENT)/Contents-amd64";
+	ShortDescription "Contents";
+	Description "\$(RELEASE)/\$(COMPONENT) amd64 Contents";
+};
+Acquire::IndexTargets::deb::Contents2 {
+	MetaKey "Contents-all";
+	ShortDescription "Contents2";
+	Description "\$(RELEASE) all Contents2";
+	Fallback-Of "Contents";
+};
+EOF
+testequal "'http://localhost:${APTHTTPPORT}/dists/unstable/InRelease' localhost:${APTHTTPPORT}_dists_unstable_InRelease 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/source/Sources.xz' localhost:${APTHTTPPORT}_dists_unstable_main_source_Sources 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/binary-amd64/Packages.xz' localhost:${APTHTTPPORT}_dists_unstable_main_binary-amd64_Packages 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/binary-all/Packages.xz' localhost:${APTHTTPPORT}_dists_unstable_main_binary-all_Packages 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/i18n/Translation-en.xz' localhost:${APTHTTPPORT}_dists_unstable_main_i18n_Translation-en 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/Contents-amd64.xz' localhost:${APTHTTPPORT}_dists_unstable_main_Contents-amd64 0 " aptget update --print-uris
+testsuccessequal "Hit:1 http://localhost:${APTHTTPPORT} unstable InRelease
+Get:2 http://localhost:${APTHTTPPORT} unstable/main amd64 Contents [$(stat -c%s aptarchive/dists/unstable/main/Contents-amd64.gz) B]
+Reading package lists..." aptget update
+testequal "rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-amd64" find rootdir/var/lib/apt/lists -name '*Contents*'
+testequal "$(readfile Contents-amd64)" aptget indextargets --format '$(FILENAME)' 'Created-By: Contents'
+testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents2'
+testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents3'
+testsuccess cmp "rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-amd64" 'aptarchive/dists/unstable/main/Contents-amd64'
+
+msgmsg "Contents with 3 MetaKeys, third match"
+rm ./rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-amd64
+testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents'
+echo 'Acquire::IndexTargets::deb::Contents::MetaKey "$(COMPONENT)/Contents-i386";' >> rootdir/etc/apt/apt.conf.d/content-target.conf
+testequal "'http://localhost:${APTHTTPPORT}/dists/unstable/InRelease' localhost:${APTHTTPPORT}_dists_unstable_InRelease 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/source/Sources.xz' localhost:${APTHTTPPORT}_dists_unstable_main_source_Sources 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/binary-amd64/Packages.xz' localhost:${APTHTTPPORT}_dists_unstable_main_binary-amd64_Packages 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/binary-all/Packages.xz' localhost:${APTHTTPPORT}_dists_unstable_main_binary-all_Packages 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/i18n/Translation-en.xz' localhost:${APTHTTPPORT}_dists_unstable_main_i18n_Translation-en 0 
+'http://localhost:${APTHTTPPORT}/dists/unstable/main/Contents-i386.xz' localhost:${APTHTTPPORT}_dists_unstable_main_Contents-i386 0 " aptget update --print-uris
+testsuccessequal "Hit:1 http://localhost:${APTHTTPPORT} unstable InRelease
+Get:2 http://localhost:${APTHTTPPORT} unstable all Contents3 [$(stat -c%s aptarchive/dists/unstable/main/Contents-all.gz) B]
+Reading package lists..." aptget update
+testequal "rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-all" find rootdir/var/lib/apt/lists -name '*Contents*'
+testequal "$(readfile Contents-all)" aptget indextargets --format '$(FILENAME)' 'Created-By: Contents3'
+testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents'
+testempty aptget indextargets --format '$(FILENAME)' 'Created-By: Contents2'
+testsuccess cmp "rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-all" 'aptarchive/dists/unstable/main/Contents-all'
+
+rm ./rootdir/var/lib/apt/lists/localhost:${APTHTTPPORT}_dists_unstable_main_Contents-all
 rm -f rootdir/etc/apt/apt.conf.d/content-target.conf
 msgmsg "No Contents file"