graftcopies: use _filter() for filtering out invalid copies

`graftcopies()` (formerly called `duplicatecopies()`) checked that the
copy destination existed in the working copy, but it didn't check that
copy source existed in the parent of the working copy. In
`test-graft.t` we can see that as warnings about not finding ancestors
of the copied files, and also empty commits getting created.

This patch uses the existing `_filter()` function for filtering out
invalid copies. In addition to the aforementioned types, that also
includes copies where source and destination is the same.

Differential Revision: https://phab.mercurial-scm.org/D7859

mercurial/copies.py

@@ -875,11 +875,12 b' def graftcopies(repo, wctx, ctx, base, s'
         # of the function is much faster (and is required for carrying copy
         # metadata across the rebase anyway).
         exclude = pathcopies(base, skip)
-    for dst, src in pycompat.iteritems(pathcopies(base, ctx)):
+    new_copies = pathcopies(base, ctx)
+    _filter(wctx.p1(), wctx, new_copies)
+    for dst, src in pycompat.iteritems(new_copies):
         if dst in exclude:
             continue
-        if dst in wctx:
-            wctx[dst].markcopied(src)
+        wctx[dst].markcopied(src)
 
 
 def computechangesetfilesadded(ctx):

tests/test-graft-rename.t

@@ -118,7 +118,6 b' two renames actually converge to the sam'
   grafting 2:f58c7e2b28fa "C0"
   merging f1a and f1b to f1a
   merging f5a
-  warning: can't find ancestor for 'f5a' copied from 'f5b'!
   $ hg status --change .
   M f1a
   M f5a
@@ -137,7 +136,6 b' Test the cases A.0 (f4x) and A.6 (f3x)'
   note: possible conflict - f3b was renamed multiple times to:
    f3a
    f3d
-  warning: can't find ancestor for 'f3d' copied from 'f3b'!
 
 Set up the repository for some further tests
 
@@ -224,7 +222,6 b' Test the cases A.1 (f4x) and A.7 (f3x).'
    f3d
    f3e
   merging f4e and f4a to f4e
-  warning: can't find ancestor for 'f3d' copied from 'f3b'!
 
   $ hg cat f2c
   c2e
@@ -232,7 +229,6 b' Test the cases A.1 (f4x) and A.7 (f3x).'
 Test the case A.5 (move case, f1x).
 
   $ hg up -q "desc("C0")"
-BROKEN: Shouldn't get the warning about missing ancestor
   $ HGEDITOR="echo E1 >" hg graft -r 'desc("E0")' --edit
   grafting 6:6bd1736cab86 "E0"
   note: possible conflict - f1a was renamed multiple times to:
@@ -243,18 +239,14 b" BROKEN: Shouldn't get the warning about "
    f3e
   merging f2c and f2a to f2c
   merging f5a and f5b to f5b
-  warning: can't find ancestor for 'f1e' copied from 'f1a'!
-  warning: can't find ancestor for 'f3e' copied from 'f3a'!
   $ cat f1e
   c1a
 
 Test the case A.5 (copy case, f1x).
 
   $ hg up -q "desc("C0")"
-BROKEN: Shouldn't get the warning about missing ancestor
   $ HGEDITOR="echo F1 >" hg graft -r 'desc("F0")' --edit
   grafting 7:d376ab0d7fda "F0"
-  warning: can't find ancestor for 'f1f' copied from 'f1a'!
 BROKEN: f1f should be marked a copy from f1b
   $ hg st --copies --change .
   A f1f
@@ -270,7 +262,6 b' BROKEN: We should get a merge conflict f'
 "c1a")
   $ HGEDITOR="echo G1 >" hg graft -r 'desc("G0")' --edit
   grafting 8:ba67f08fb15a "G0"
-  warning: can't find ancestor for 'f1g' copied from 'f1a'!
 
 Check the results of the grafts tested
 

tests/test-graft.t

@@ -493,7 +493,6 b' Graft with --log'
   $ hg up -Cq 1
   $ hg graft 3 --log -u foo
   grafting 3:4c60f11aa304 "3"
-  warning: can't find ancestor for 'c' copied from 'b'!
   $ hg log --template '{rev}:{node|short} {parents} {desc}\n' -r tip
   14:0c921c65ef1e 1:5d205f8b35b6  3
   (grafted from 4c60f11aa304a54ae1c199feb94e7fc771e51ed8)
@@ -753,12 +752,7 b' Transplants of grafts can find a destina'
    branchmerge: True, force: True, partial: False
    ancestor: b592ea63bb0c, local: 7e61b508e709+, remote: 7a4785234d87
   starting 4 threads for background file closing (?)
-  committing files:
-  b
-  warning: can't find ancestor for 'b' copied from 'a'!
-  reusing manifest from p1 (listed files actually unchanged)
-  committing changelog
-  updating the branch cache
+  note: graft of 13:7a4785234d87 created no changes to commit
   $ hg log -r 'destination(13)'
 All copies of a cset
   $ hg log -r 'origin(13) or destination(origin(13))'
@@ -785,12 +779,6 b' All copies of a cset'
   
   changeset:   21:7e61b508e709
   branch:      dev
-  user:        foo
-  date:        Thu Jan 01 00:00:00 1970 +0000
-  summary:     2
-  
-  changeset:   22:3a4e92d81b97
-  branch:      dev
   tag:         tip
   user:        foo
   date:        Thu Jan 01 00:00:00 1970 +0000
@@ -809,27 +797,28 b" graft with --force (still doesn't graft "
   $ hg graft 19 0 6
   skipping ungraftable merge revision 6
   skipping ancestor revision 0:68795b066622
-  skipping already grafted revision 19:9627f653b421 (22:3a4e92d81b97 also has origin 2:5c095ad7e90f)
-  [255]
+  grafting 19:9627f653b421 "2"
+  merging b
+  note: graft of 19:9627f653b421 created no changes to commit
   $ hg graft 19 0 6 --force
   skipping ungraftable merge revision 6
   grafting 19:9627f653b421 "2"
   merging b
-  warning: can't find ancestor for 'b' copied from 'a'!
+  note: graft of 19:9627f653b421 created no changes to commit
   grafting 0:68795b066622 "0"
 
 graft --force after backout
 
   $ echo abc > a
-  $ hg ci -m 26
-  $ hg backout 26
+  $ hg ci -m 24
+  $ hg backout 24
   reverting a
-  changeset 27:e25e17192dc4 backs out changeset 26:44f862488a35
-  $ hg graft 26
-  skipping ancestor revision 26:44f862488a35
+  changeset 25:71c4e63d4f98 backs out changeset 24:2e7ea477be26
+  $ hg graft 24
+  skipping ancestor revision 24:2e7ea477be26
   [255]
-  $ hg graft 26 --force
-  grafting 26:44f862488a35 "26"
+  $ hg graft 24 --force
+  grafting 24:2e7ea477be26 "24"
   merging a
   $ cat a
   abc
@@ -837,9 +826,9 b' graft --force after backout'
 graft --continue after --force
 
   $ echo def > a
-  $ hg ci -m 29
-  $ hg graft 26 --force --tool internal:fail
-  grafting 26:44f862488a35 "26"
+  $ hg ci -m 27
+  $ hg graft 24 --force --tool internal:fail
+  grafting 24:2e7ea477be26 "24"
   abort: unresolved conflicts, can't continue
   (use 'hg resolve' and 'hg graft --continue')
   [255]
@@ -852,7 +841,7 b' graft --continue after --force'
   (no more unresolved files)
   continue: hg graft --continue
   $ hg graft -c
-  grafting 26:44f862488a35 "26"
+  grafting 24:2e7ea477be26 "24"
   $ cat a
   abc
 
@@ -869,12 +858,12 b' but do some destructive editing of the r'
 
 Empty graft
 
-  $ hg up -qr 24
+  $ hg up -qr 22
   $ hg tag -f something
-  $ hg graft -qr 25
-  $ hg graft -f 25
-  grafting 25:bd0c98709948 "26"
-  note: graft of 25:bd0c98709948 created no changes to commit
+  $ hg graft -qr 23
+  $ hg graft -f 23
+  grafting 23:72d9c7c75bcc "24"
+  note: graft of 23:72d9c7c75bcc created no changes to commit
 
   $ cd ..
 

tests/test-issue1175.t

@@ -82,7 +82,6 b' https://bz.mercurial-scm.org/show_bug.cg'
   continue: hg graft --continue
   $ hg graft --continue
   grafting 1:5974126fad84 "b1"
-  warning: can't find ancestor for 'b' copied from 'a'!
   $ hg log -f b -T 'changeset:   {rev}:{node|short}\nsummary:     {desc}\n\n'
   changeset:   3:376d30ccffc0
   summary:     b1