subrepo: correctly handle update -C with modified subrepos (issue2022)

(based on a patch by Saint Germain)

mercurial/merge.py

@@ -167,7 +167,7 b' def manifestmerge(repo, p1, p2, pa, over'
     m1, m2, ma = p1.manifest(), p2.manifest(), pa.manifest()
     copied = set(copy.values())
 
-    if not overwrite and '.hgsubstate' in m1:
+    if '.hgsubstate' in m1:
         # check whether sub state is modified
         for s in p1.substate:
             if p1.sub(s).dirty():

mercurial/subrepo.py

@@ -67,11 +67,13 b' def submerge(repo, wctx, mctx, actx):'
         repo.ui.debug("  subrepo %s: %s %s\n" % (s, msg, r))
 
     for s, l in s1.items():
+        a = sa.get(s, nullstate)
         ld = l # local state with possible dirty flag for compares
-        if wctx != actx and wctx.sub(s).dirty():
+        if wctx.sub(s).dirty():
             ld = (l[0], l[1] + "+")
+        if wctx == actx: # overwrite
+            a = ld
 
-        a = sa.get(s, nullstate)
         if s in s2:
             r = s2[s]
             if ld == r or r == a: # no change or local is newer

tests/test-subrepo

@@ -19,6 +19,13 b' hg -R s ci -Ams0'
 hg sum
 hg ci -m1
 
+# issue 2022 - update -C
+
+echo b > s/a
+hg sum
+hg co -C 1
+hg sum
+
 echo % add sub sub
 echo ss = ss > s/.hgsub
 hg init s/ss

tests/test-subrepo.out

@@ -8,6 +8,17 b' branch: default'
 commit: 1 added, 1 subrepos
 update: (current)
 committing subrepository s
+parent: 1:7cf8cfea66e4 tip
+ 1
+branch: default
+commit: 1 subrepos
+update: (current)
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+parent: 1:7cf8cfea66e4 tip
+ 1
+branch: default
+commit: (clean)
+update: (current)
 % add sub sub
 parent: 1:7cf8cfea66e4 tip
  1