do not request files if we expect an IMS hit

If we have a file on disk and the hashes are the same in the new Release
file and the old one we have on disk we know that if we ask the server
for the file, we will at best get an IMS hit – at worse the server
doesn't support this and sends us the (unchanged) file and we have to
run all our checks on it again for nothing. So, we can save ourselves
(and the servers) some unneeded requests if we figure this out on our
own.

1 files changed, 18 insertions, 6 deletions

diff --git a/test/integration/test-apt-update-transactions b/test/integration/test-apt-update-transactions
index 152e1617a..a5dac1737 100755
--- a/test/integration/test-apt-update-transactions
+++ b/test/integration/test-apt-update-transactions
@@ -29,6 +29,12 @@ restorefile() {
 }
 
 testrun() {
+	rm -rf aptarchive/dists.good
+	cp -a aptarchive/dists aptarchive/dists.good
+	insertpackage 'unstable' 'bar' 'all' '1.0'
+	insertsource 'unstable' 'bar' 'all' '1.0'
+	buildaptarchivefromfiles '+1 hour'
+
 	# produce an unsigned repository
 	find aptarchive \( -name 'Release.gpg' -o -name 'InRelease' \) -delete
 	testfailure aptget update --no-allow-insecure-repositories
@@ -37,20 +43,27 @@ testrun() {
 	# signed but broken
 	signreleasefiles
 
+	onehashbroken() {
+		testfailure aptget update
+		# each file generates two messages with this string
+		testequal '2' grep --count 'Hash Sum mismatch' rootdir/tmp/testfailure.output
+		testfileequal "$1" "$(listcurrentlistsdirectory)"
+	}
+
 	breakfile aptarchive/dists/unstable/main/binary-i386/Packages
-	testfailure aptget update
-	testfileequal "$1" "$(listcurrentlistsdirectory)"
+	onehashbroken "$1"
 	restorefile aptarchive/dists/unstable/main/binary-i386/Packages
 
 	breakfile aptarchive/dists/unstable/main/source/Sources
-	testfailure aptget update
-	testfileequal "$1" "$(listcurrentlistsdirectory)"
+	onehashbroken "$1"
 	restorefile aptarchive/dists/unstable/main/source/Sources
+
+	rm -rf aptarchive/dists
+	cp -a aptarchive/dists.good aptarchive/dists
 }
 
 testsetup() {
 	msgmsg 'Test with no initial data over' "$1"
-	redatereleasefiles 'now'
 	rm -rf rootdir/var/lib/apt/lists
 	mkdir -p rootdir/var/lib/apt/lists/partial
 	listcurrentlistsdirectory > listsdir.lst
@@ -60,7 +73,6 @@ testsetup() {
 	rm -rf rootdir/var/lib/apt/lists
 	testsuccess aptget update -o Debug::pkgAcquire::Worker=1
 	listcurrentlistsdirectory > listsdir.lst
-	redatereleasefiles '+1hour'
 	testrun 'listsdir.lst'
 }