Allow package version to be marked as weakly retained

Allow a package version to be explicitly marked as weakly retained in
override.hint.

Ideally, we'd like something that let's us make a transaction that
removes a given source package and all install packages generated from
it, but we're not there yet...

2 files changed, 11 insertions, 0 deletions

diff --git a/calm/hint.py b/calm/hint.py
index ddfcf74..6034c1d 100755
--- a/calm/hint.py
+++ b/calm/hint.py
@@ -93,6 +93,7 @@ hintkeys[override] = {
     'keep-superseded-test': 'noval',
     'disable-check': 'val',
     'replace-versions': 'val',
+    'noretain': 'val',
 }
 
 # valid categories
diff --git a/calm/package.py b/calm/package.py
index d3b5ab0..4538b8d 100755
--- a/calm/package.py
+++ b/calm/package.py
@@ -1529,6 +1529,16 @@ def stale_packages(packages):
 
                 mark = dep_so_age_mark
 
+        elif 'noretain' in po.override_hints:
+            def noretain_hint_mark(v):
+                noretain_versions = po.override_hints.get('noretain', '').split()
+                if (v in noretain_versions) or ('all' in noretain_versions):
+                    return Freshness.conditional
+                else:
+                    return Freshness.fresh
+
+            mark = noretain_hint_mark
+
         # mark any versions explicitly listed in the keep: override hint (unconditionally)
         for v in po.override_hints.get('keep', '').split():
             if v in po.versions():