Add experimental build profiles support

This adds the basic infrastructure support for a new class of generic
build-time dependency restrictions, and in particular implements the
specific build profiles, which will allow to cull build dependencies
depending on the profile being used. There's several things this can
be used for, like new port bootstrapping, reduced package builds, and
similar. In the future other kinds of restrictions could be added as
the build profiles are namespaced with “profile.”. An example field
could be:

  Build-Depends: exotic-compiler, libneeded-dev, tool-tiny,
   tool-huge (>= 1.0) [linux-any] <!profile.embedded !profile.bootstrap>

or even stuff like:

  Depends: net-tools <profile.network>, plugin-curl <!profile.no-plugins>

The generated binary packages and .changes files will get a new
Built-For-Profiles field containing the active profiles during the build.

In addition the build profile can be selected using the environment
variable DEB_BUILD_PROFILES, with space separated values, such as:

  DEB_BUILD_PROFILES="embedded bootstrap"

The management and possible registration in the profile namespace is
currently out of scope in dpkg, this should probably be handled by a
distribution specific process.

See draft <http://www.hadrons.org/~guillem/debian/docs/embedded.proposal>.

Closes: #661538

Based-on-patch-by: Patrick "P. J." McDermott <pjm@nac.net>
Based-on-patch-by: Wookey <wookey@debian.org>
Based-on-patch-by: Johannes Schauer <j.schauer@email.de>
Signed-off-by: Guillem Jover <guillem@debian.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/scripts/Dpkg/Control/FieldsCore.pm b/scripts/Dpkg/Control/FieldsCore.pm
index e0124fcd8..a8d63e0ef 100644
--- a/scripts/Dpkg/Control/FieldsCore.pm
+++ b/scripts/Dpkg/Control/FieldsCore.pm
@@ -111,6 +111,10 @@ our %FIELDS = (
         dependency => 'normal',
         dep_order => 3,
     },
+    'Built-For-Profiles' => {
+        allowed => ALL_PKG | CTRL_FILE_CHANGES,
+        separator => FIELD_SEP_SPACE,
+    },
     'Built-Using' => {
         allowed => ALL_PKG,
         separator => FIELD_SEP_COMMA,
@@ -337,7 +341,8 @@ my @sum_fields = map { $_ eq 'md5' ? 'MD5sum' : &field_capitalize($_) }
 our %FIELD_ORDER = (
     CTRL_PKG_DEB() => [
         qw(Package Package-Type Source Version Built-Using Kernel-Version
-        Architecture Subarchitecture Installer-Menu-Item Essential Origin Bugs
+        Built-For-Profiles Architecture Subarchitecture
+        Installer-Menu-Item Essential Origin Bugs
         Maintainer Installed-Size), &field_list_pkg_dep(),
         qw(Section Priority Multi-Arch Homepage Description Tag Task)
     ],
@@ -349,8 +354,8 @@ our %FIELD_ORDER = (
         @checksum_fields, qw(Files)
     ],
     CTRL_FILE_CHANGES() => [
-        qw(Format Date Source Binary Binary-Only Architecture Version
-        Distribution Urgency Maintainer Changed-By Description
+        qw(Format Date Source Binary Binary-Only Built-For-Profiles Architecture
+        Version Distribution Urgency Maintainer Changed-By Description
         Closes Changes),
         @checksum_fields, qw(Files)
     ],