don't ask server if we have entire file in partial/

We have this situation in cases were parts of the transaction are
refused (e.g. in a hashsum mismatch) and rerun the update (e.g. in the
hope that we get a mirror which is synced this time).

Previously we would ask the server with an if-range and in the best case
recieve a 416 in response (less featureful server might end up giving us
the entire file again or we get the wrong file this time giving us a
hashsum mismatch…), which is a waste of time if we know already by
checking the hashsums that we got the complete and correct file.

3 files changed, 27 insertions, 7 deletions

diff --git a/test/integration/framework b/test/integration/framework
index 213169a98..2a78e6194 100644
--- a/test/integration/framework
+++ b/test/integration/framework
@@ -1505,6 +1505,14 @@ testmarkedmanual() {
 	msggroup
 }
 
+catfile() {
+	if [ "${1##*.}" = 'deb' ]; then
+		stat >&2 "$1" || true
+		file >&2 "$1" || true
+	else
+		cat >&2 "$1" || true
+	fi
+}
 msgfailoutput() {
 	msgreportheader 'msgfailoutput'
 	local MSG="$1"
@@ -1514,7 +1522,7 @@ msgfailoutput() {
 		echo >&2
 		while [ -n "$2" ]; do shift; done
 		echo "#### Complete file: $1 ####"
-		cat >&2 "$1" || true
+		catfile "$1"
 		echo '#### grep output ####'
 	elif [ "$1" = 'test' ]; then
 		echo >&2
@@ -1529,7 +1537,7 @@ msgfailoutput() {
 					ls >&2 "$2" || true
 				elif test -e "$2"; then
 					echo "#### Complete file: $2 ####"
-					cat >&2 "$2" || true
+					catfile "$2"
 				fi
 			fi
 		}
@@ -1543,12 +1551,12 @@ msgfailoutput() {
 		echo >&2
 		while [ -n "$2" ]; do
 			echo "#### Complete file: $2 ####"
-			cat >&2 "$2" || true
+			catfile "$2"
 			shift
 		done
 		echo '#### cmp output ####'
 	fi
-	cat >&2 "$OUTPUT"
+	catfile "$OUTPUT"
 	msgfail "$MSG"
 }
 
diff --git a/test/integration/test-apt-update-transactions b/test/integration/test-apt-update-transactions
index 884838038..d8154b283 100755
--- a/test/integration/test-apt-update-transactions
+++ b/test/integration/test-apt-update-transactions
@@ -44,7 +44,8 @@ testrun() {
 	signreleasefiles
 
 	onehashbroken() {
-		testfailure aptget update
+		rm -rf rootdir/var/lib/apt/lists/partial
+		testfailure aptget update -o Debug::pkgAcquire::Worker=1 -o Debug::Acquire::http=1
 		# each file generates two messages with this string
 		testequal '2' grep --count 'Hash Sum mismatch' rootdir/tmp/testfailure.output
 		testfileequal "$1" "$(listcurrentlistsdirectory)"
diff --git a/test/integration/test-pdiff-usage b/test/integration/test-pdiff-usage
index f219b9193..9c7946083 100755
--- a/test/integration/test-pdiff-usage
+++ b/test/integration/test-pdiff-usage
@@ -30,7 +30,7 @@ echo 'hacked' > aptarchive/hacked-i386
 compressfile aptarchive/hacked-i386
 
 wasmergeused() {
-	testsuccess apt update "$@" -o Debug::pkgAcquire::Worker=1 -o Debug::Acquire::http=1 -o Debug::pkgAcquire=1
+	testsuccess apt update "$@"
 
 	msgtest 'No intermediate patch files' 'still exist'
 	local EDS="$(find rootdir/var/lib/apt/lists -name '*.ed' -o -name '*.ed.*')"
@@ -224,6 +224,14 @@ SHA256-Download:
 	testsuccessequal "$(cat "${PKGFILE}")
 " aptcache show apt oldstuff
 
+	# we reuse the entire state of the previous test here
+	msgmsg "Testcase: good files from previous fails are picked up from partial: $*"
+	wasmergeused "$@"
+	testfailure grep '^GET /Packages.diff/Index HTTP/1.1' rootdir/tmp/testsuccess.output
+	testnopackage oldstuff
+	testsuccessequal "$(cat Packages-future)
+" aptcache show apt newstuff futurestuff
+
 	# we reuse the archive state of the previous test here
 	msgmsg "Testcase: downloading a patch fails, but successful fallback: $*"
 	rm -rf rootdir/var/lib/apt/lists
@@ -294,7 +302,7 @@ SHA256-Download:
  $(sha256sum "${PATCHFILE}.gz" | cut -d' ' -f 1) $(stat -c%s "${PATCHFILE}.gz")000 $(basename "${PATCHFILE}.gz")" > "$PATCHINDEX"
 	generatereleasefiles '+1hour'
 	signreleasefiles
-	testsuccess apt update -o Debug::pkgAcquire::Diffs=1 "$@"
+	testsuccess apt update "$@"
 	cp -f rootdir/tmp/testsuccess.output rootdir/tmp/aptupdate.output
 	testsuccess grep 'bytes (Limit is' rootdir/tmp/aptupdate.output
 	testnopackage oldstuff
@@ -303,6 +311,9 @@ SHA256-Download:
 }
 echo 'Debug::pkgAcquire::Diffs "true";
 Debug::Acquire::Transaction "true";
+Debug::pkgAcquire::Worker "true";
+Debug::Acquire::http "true";
+Debug::pkgAcquire "true";
 Debug::pkgAcquire::rred "true";' > rootdir/etc/apt/apt.conf.d/rreddebug.conf
 
 testcase() {