Add a Packages-Require-Authorization Release file field

This new field allows a repository to declare that access to
packages requires authorization. The current implementation will
set the pin to -32768 if no authorization has been provided in
the auth.conf(.d) files.

This implementation is suboptimal in two aspects:
(1) A repository should behave more like NotSource repositories
(2) We only have the host name for the repository, we cannot use
    paths yet.

- We can fix those after an ABI break.

The code also adds a check to acquire-item.cc to not use the
specified repository as a download source, mimicking NotSource.

(cherry picked from commit c2b9b0489538fed4770515bd8853a960b13a2618)
LP: #1814727
(cherry picked from commit d75162bc67d5a1a690eb2a8747d31ad68353823e)
(cherry picked from commit 19075f52174199fe7665334ad1815c747c26c10b)

Conflicts:
	apt-pkg/deb/debmetaindex.cc
	apt-pkg/pkgcache.h

1 files changed, 61 insertions, 0 deletions

diff --git a/test/integration/test-packages-require-authorization b/test/integration/test-packages-require-authorization
new file mode 100755
index 000000000..803957c5e
--- /dev/null
+++ b/test/integration/test-packages-require-authorization
@@ -0,0 +1,61 @@
+#!/bin/sh
+set -e
+
+TESTDIR="$(readlink -f "$(dirname "$0")")"
+. "$TESTDIR/framework"
+setupenvironment
+configarchitecture 'amd64'
+
+insertpackage 'unstable' 'cool' 'amd64' '1.0'
+
+export APT_DONT_SIGN='InRelease'
+setupaptarchive --no-update
+changetowebserver
+
+echo 'Packages-Require-Authorization: yes' >> aptarchive/dists/unstable/Release
+signreleasefiles
+
+testsuccess aptget update
+testequal "Package files:
+ 100 ${TMPWORKINGDIRECTORY}/rootdir/var/lib/dpkg/status
+     release a=now
+-32768 http://localhost:8080/ unstable/main amd64 Packages
+     release a=unstable,n=sid,c=main
+     origin localhost
+Pinned packages:" aptcache policy
+
+mkdir rootdir/etc/apt/auth.conf.d
+cat > rootdir/etc/apt/auth.conf.d/myauth.conf  << EOF
+machine localhost
+login username
+password usersPassword
+EOF
+
+
+testequal "Package files:
+ 100 ${TMPWORKINGDIRECTORY}/rootdir/var/lib/dpkg/status
+     release a=now
+ 500 http://localhost:8080/ unstable/main amd64 Packages
+     release a=unstable,n=sid,c=main
+     origin localhost
+Pinned packages:" aptcache policy
+
+
+cat > rootdir/etc/apt/preferences.d/myauth.pref  << EOF
+Package: *
+Pin: origin localhost
+Pin-Priority: 990
+
+Package: cool
+Pin: origin localhost
+Pin-Priority: 990
+EOF
+
+testequal "Package files:
+ 100 ${TMPWORKINGDIRECTORY}/rootdir/var/lib/dpkg/status
+     release a=now
+ 990 http://localhost:8080/ unstable/main amd64 Packages
+     release a=unstable,n=sid,c=main
+     origin localhost
+Pinned packages:
+     cool -> 1.0" aptcache policy