Updating the ChangeLog file may be desirable in more repos than just the
one named 'gentoo', like e.g. the Prefix one. Hence, make this default
configurable though metadata/layout.conf.

This commit must go accompanied by a commit to
gentoo-x86/metadata/layout.conf that adds the following bit:

# Bug #337853 - gentoo's council says to enable
# --echangelog by default for the "gentoo" repo
update-changelog = true

diff --git a/bin/repoman b/bin/repoman
--- a/bin/repoman
+++ b/bin/repoman
@@ -644,10 +644,7 @@
print(prefix + line)
sys.exit(1)

-if options.echangelog is None and
- repo_config.name == "gentoo":
- # Bug #337853 - gentoo's council says to enable
- # --echangelog by default for the "gentoo" repo
+if options.echangelog is None and repo_config.update_changelog:
options.echangelog = 'y'

if vcs is None:
diff --git a/pym/portage/repository/config.py b/pym/portage/repository/config.py
--- a/pym/portage/repository/config.py
+++ b/pym/portage/repository/config.py
@@ -48,7 +48,7 @@
'eclass_overrides', 'eclass_locations', 'format', 'location',
'main_repo', 'manifest_hashes', 'masters', 'missing_repo_name',
'name', 'priority', 'sign_manifest', 'sync', 'thin_manifest',
- 'user_location')
+ 'update_changelog', 'user_location')

def __init__(self, name, repo_opts):
"""Build a RepoConfig with options in repo_opts
@@ -126,6 +126,7 @@
self.create_manifest = True
self.disable_manifest = False
self.manifest_hashes = None
+ self.update_changelog = False
self.cache_format = None

def get_pregenerated_cache(self, auxdbkeys, readonly=True, force=False):
@@ -431,6 +432,9 @@
DeprecationWarning)
repo.manifest_hashes = manifest_hashes

+ if layout_data.get('update-changelog', ').lower() == 'true':
+ repo.update_changelog = True
+
#Take aliases into account.
new_prepos = {}
for repo_name, repo in prepos.items():