Pull defaults for Components and Architectures from Release

Why duplicate that in the configuration when Britney can just pull it
in the Release file for testing? :)

Closes: Debian/britney2#11
Signed-off-by: Niels Thykier <niels@thykier.net>

britney.conf

@@ -6,7 +6,10 @@ TPU               = /srv/mirrors/debian/dists/testing-proposed-updates
 PU                = /srv/mirrors/debian/dists/proposed-updates
 UNSTABLE          = /srv/mirrors/debian/dists/unstable
 
-COMPONENTS        = main, non-free, contrib
+# Defaults to the value from testing's Release file (if present)
+# - Not used with the legacy layout.
+#
+#COMPONENTS        = main, non-free, contrib
 
 # Output
 NONINST_STATUS    = /srv/release.debian.org/britney/var/data-b2/non-installable-status
@@ -24,8 +27,10 @@ STATIC_INPUT_DIR = /srv/release.debian.org/britney/input
 # (e.g. urgency information).
 STATE_DIR          = /srv/release.debian.org/britney/state
 
-# List of release architectures
-ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
+# List of architectures that Britney should consider.
+# - defaults to the value in testing's Release file (if it is present).
+# - Required for the legacy layout.
+#ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
 
 # if you're not in this list, arch: all packages are allowed to break on you
 NOBREAKALL_ARCHES = i386 amd64

britney.conf.template

@@ -9,8 +9,10 @@ TESTING           = /path/to/target/suite
 # TPU               = /path/to/secondary-source/suite
 # PU                = /path/to/another-source/suite
 
-# List of components to work with
-COMPONENTS        = main, non-free, contrib
+# Defaults to the value from testing's Release file (if present)
+# - Not used with the legacy layout.
+#
+#COMPONENTS        = main, non-free, contrib
 
 # Output
 NONINST_STATUS      = /path/to/britneys-output-dir/non-installable-status
@@ -29,8 +31,10 @@ HEIDI_DELTA_OUTPUT  = /path/to/britneys-output-dir/HeidiResultDelta
 # (e.g. urgency information).
 STATE_DIR          = /path/to/britey/state-dir
 
-# List of architectures Britney should consider
-ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel powerpc ppc64el s390x
+# List of architectures that Britney should consider.
+# - defaults to the value in testing's Release file (if it is present).
+# - Required for the legacy layout.
+#ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el powerpc ppc64el s390x
 
 # if you're not in this list, arch: all packages are allowed to break on you
 NOBREAKALL_ARCHES = i386 amd64

britney.py

@@ -473,9 +473,18 @@ class Britney(object):
                     elif not hasattr(self.options, k.lower()) or \
                          not getattr(self.options, k.lower()):
                         setattr(self.options, k.lower(), v)
+        try:
+            release_file = read_release_file(self.options.testing)
+            self.log("Found a Release file in testing - using that for defaults")
+        except FileNotFoundError:
+            self.log("Testing does not have a Release file.")
+            release_file = None
 
         if getattr(self.options, "components", None):
             self.options.components = [s.strip() for s in self.options.components.split(",")]
+        elif release_file and not self.options.control_files:
+            self.options.components = release_file['Components'].split()
+            self.log("Using components listed in Release file: %s" % ' '.join(self.options.components))
         else:
             self.options.components = None
 
@@ -493,8 +502,17 @@ class Britney(object):
         self.options.break_arches = self.options.break_arches.split()
         self.options.new_arches = self.options.new_arches.split()
 
-        # Sort the architecture list
-        allarches = sorted(self.options.architectures.split())
+        if getattr(self.options, "architectures", None):
+            # Sort the architecture list
+            allarches = sorted(self.options.architectures.split())
+        else:
+            if not release_file:
+                self.log("No configured architectures and there is no release file for testing", type="E")
+                self.log("Please check if there is a \"Release\" file in %s" % self.options.testing, type="E")
+                self.log("or if the config file contains a non-empty \"ARCHITECTURES\" field", type="E")
+                sys.exit(1)
+            allarches = sorted(release_file['Architectures'].split())
+            self.log("Using architectures listed in Release file: %s" % ' '.join(allarches))
         arches = [x for x in allarches if x in self.options.nobreakall_arches]
         arches += [x for x in allarches if x not in arches and x not in self.options.outofsync_arches]
         arches += [x for x in allarches if x not in arches and x not in self.options.break_arches]

britney_nobreakall.conf

@@ -6,7 +6,10 @@ TPU               = /srv/mirrors/debian/dists/testing-proposed-updates
 PU                = /srv/mirrors/debian/dists/proposed-updates
 UNSTABLE          = /srv/mirrors/debian/dists/unstable
 
-COMPONENTS        = main, non-free, contrib
+# Defaults to the value from testing's Release file (if present)
+# - Not used with the legacy layout.
+#
+#COMPONENTS        = main, non-free, contrib
 
 # Output
 NONINST_STATUS    = /srv/release.debian.org/britney/var/data-b2/non-installable-status
@@ -24,8 +27,10 @@ STATIC_INPUT_DIR = /srv/release.debian.org/britney/input
 # (e.g. urgency information).
 STATE_DIR          = /srv/release.debian.org/britney/state
 
-# List of release architectures
-ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
+# List of architectures that Britney should consider.
+# - defaults to the value in testing's Release file (if it is present).
+# - Required for the legacy layout.
+#ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
 
 # if you're not in this list, arch: all packages are allowed to break on you
 NOBREAKALL_ARCHES = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x