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tests: split out another ~1/2 of test-graft.t The tests involving renames were also quite independent from the rest. Differential Revision: https://phab.mercurial-scm.org/D7803
author Martin von Zweigbergk <martinvonz@google.com>
date Fri, 27 Dec 2019 15:53:16 -0800
parents 58db8f63f4e2
children 2abffea40700
files tests/test-graft-rename.t tests/test-graft.t
diffstat 2 files changed, 733 insertions(+), 732 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-graft-rename.t	Fri Dec 27 15:53:16 2019 -0800
@@ -0,0 +1,733 @@
+
+Graft from behind a move or rename
+==================================
+
+NOTE: This is affected by issue5343, and will need updating when it's fixed
+
+Consider this topology for a regular graft:
+
+o c1
+|
+| o c2
+| |
+| o ca # stands for "common ancestor"
+|/
+o cta # stands for "common topological ancestor"
+
+Note that in issue5343, ca==cta.
+
+The following table shows the possible cases. Here, "x->y" and, equivalently,
+"y<-x", where x is an ancestor of y, means that some copy happened from x to y.
+
+name | c1<-cta | cta<->ca | ca->c2
+A.0  |         |          |
+A.1  |    X    |          |
+A.2  |         |     X    |
+A.3  |         |          |   X
+A.4  |    X    |     X    |
+A.5  |    X    |          |   X
+A.6  |         |     X    |   X
+A.7  |    X    |     X    |   X
+
+A.0 is trivial, and doesn't need copy tracking.
+For A.1, a forward rename is recorded in the c1 pass, to be followed later.
+In A.2, the rename is recorded in the c2 pass and followed backwards.
+A.3 is recorded in the c2 pass as a forward rename to be duplicated on target.
+In A.4, both passes of checkcopies record incomplete renames, which are
+then joined in mergecopies to record a rename to be followed.
+In A.5 and A.7, the c1 pass records an incomplete rename, while the c2 pass
+records an incomplete divergence. The incomplete rename is then joined to the
+appropriate side of the incomplete divergence, and the result is recorded as a
+divergence. The code doesn't distinguish at all between these two cases, since
+the end result of them is the same: an incomplete divergence joined with an
+incomplete rename into a divergence.
+Finally, A.6 records a divergence entirely in the c2 pass.
+
+A.4 has a degenerate case a<-b<-a->a, where checkcopies isn't needed at all.
+A.5 has a special case a<-b<-b->a, which is treated like a<-b->a in a merge.
+A.5 has issue5343 as a special case.
+A.6 has a special case a<-a<-b->a. Here, checkcopies will find a spurious
+incomplete divergence, which is in fact complete. This is handled later in
+mergecopies.
+A.7 has 4 special cases: a<-b<-a->b (the "ping-pong" case), a<-b<-c->b,
+a<-b<-a->c and a<-b<-c->a. Of these, only the "ping-pong" case is interesting,
+the others are fairly trivial (a<-b<-c->b and a<-b<-a->c proceed like the base
+case, a<-b<-c->a is treated the same as a<-b<-b->a).
+
+f5a therefore tests the "ping-pong" rename case, where a file is renamed to the
+same name on both branches, then the rename is backed out on one branch, and
+the backout is grafted to the other branch. This creates a challenging rename
+sequence of a<-b<-a->b in the graft target, topological CA, graft CA and graft
+source, respectively. Since rename detection will run on the c1 side for such a
+sequence (as for technical reasons, we split the c1 and c2 sides not at the
+graft CA, but rather at the topological CA), it will pick up a false rename,
+and cause a spurious merge conflict. This false rename is always exactly the
+reverse of the true rename that would be detected on the c2 side, so we can
+correct for it by detecting this condition and reversing as necessary.
+
+First, set up the repository with commits to be grafted
+
+  $ hg init graftmove
+  $ cd graftmove
+  $ echo c1a > f1a
+  $ echo c2a > f2a
+  $ echo c3a > f3a
+  $ echo c4a > f4a
+  $ echo c5a > f5a
+  $ hg ci -qAm A0
+  $ hg mv f1a f1b
+  $ hg mv f3a f3b
+  $ hg mv f5a f5b
+  $ hg ci -qAm B0
+  $ echo c1c > f1b
+  $ hg mv f2a f2c
+  $ hg mv f5b f5a
+  $ echo c5c > f5a
+  $ hg ci -qAm C0
+  $ hg mv f3b f3d
+  $ echo c4d > f4a
+  $ hg ci -qAm D0
+  $ hg log -G
+  @  changeset:   3:b69f5839d2d9
+  |  tag:         tip
+  |  user:        test
+  |  date:        Thu Jan 01 00:00:00 1970 +0000
+  |  summary:     D0
+  |
+  o  changeset:   2:f58c7e2b28fa
+  |  user:        test
+  |  date:        Thu Jan 01 00:00:00 1970 +0000
+  |  summary:     C0
+  |
+  o  changeset:   1:3d7bba921b5d
+  |  user:        test
+  |  date:        Thu Jan 01 00:00:00 1970 +0000
+  |  summary:     B0
+  |
+  o  changeset:   0:11f7a1b56675
+     user:        test
+     date:        Thu Jan 01 00:00:00 1970 +0000
+     summary:     A0
+  
+
+Test the cases A.2 (f1x), A.3 (f2x) and a special case of A.6 (f5x) where the
+two renames actually converge to the same name (thus no actual divergence).
+
+  $ hg up -q 'desc("A0")'
+  $ HGEDITOR="echo C1 >" hg graft -r 'desc("C0")' --edit
+  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
+  A f2c
+  R f2a
+  $ hg cat f1a
+  c1c
+  $ hg cat f1b
+  f1b: no such file in rev c9763722f9bd
+  [1]
+
+Test the cases A.0 (f4x) and A.6 (f3x)
+
+  $ HGEDITOR="echo D1 >" hg graft -r 'desc("D0")' --edit
+  grafting 3:b69f5839d2d9 "D0"
+  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
+
+  $ hg up -q "min(desc("A0"))"
+  $ hg mv f1a f1e
+  $ echo c2e > f2a
+  $ hg mv f3a f3e
+  $ hg mv f4a f4e
+  $ hg mv f5a f5b
+  $ hg ci -qAm "E0"
+  $ hg up -q "min(desc("A0"))"
+  $ hg cp f1a f1f
+  $ hg ci -qAm "F0"
+  $ hg up -q "min(desc("A0"))"
+  $ hg cp f1a f1g
+  $ echo c1g > f1g
+  $ hg ci -qAm "G0"
+  $ hg log -G
+  @  changeset:   8:ba67f08fb15a
+  |  tag:         tip
+  |  parent:      0:11f7a1b56675
+  |  user:        test
+  |  date:        Thu Jan 01 00:00:00 1970 +0000
+  |  summary:     G0
+  |
+  | o  changeset:   7:d376ab0d7fda
+  |/   parent:      0:11f7a1b56675
+  |    user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    summary:     F0
+  |
+  | o  changeset:   6:6bd1736cab86
+  |/   parent:      0:11f7a1b56675
+  |    user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    summary:     E0
+  |
+  | o  changeset:   5:560daee679da
+  | |  user:        test
+  | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | |  summary:     D1
+  | |
+  | o  changeset:   4:c9763722f9bd
+  |/   parent:      0:11f7a1b56675
+  |    user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    summary:     C1
+  |
+  | o  changeset:   3:b69f5839d2d9
+  | |  user:        test
+  | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | |  summary:     D0
+  | |
+  | o  changeset:   2:f58c7e2b28fa
+  | |  user:        test
+  | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | |  summary:     C0
+  | |
+  | o  changeset:   1:3d7bba921b5d
+  |/   user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    summary:     B0
+  |
+  o  changeset:   0:11f7a1b56675
+     user:        test
+     date:        Thu Jan 01 00:00:00 1970 +0000
+     summary:     A0
+  
+
+Test the cases A.4 (f1x), the "ping-pong" special case of A.7 (f5x),
+and A.3 with a local content change to be preserved (f2x).
+
+  $ hg up -q "desc("E0")"
+  $ HGEDITOR="echo C2 >" hg graft -r 'desc("C0")' --edit
+  grafting 2:f58c7e2b28fa "C0"
+  merging f1e and f1b to f1e
+  merging f2a and f2c to f2c
+
+Test the cases A.1 (f4x) and A.7 (f3x).
+
+  $ HGEDITOR="echo D2 >" hg graft -r 'desc("D0")' --edit
+  grafting 3:b69f5839d2d9 "D0"
+  note: possible conflict - f3b was renamed multiple times to:
+   f3d
+   f3e
+  merging f4e and f4a to f4e
+  warning: can't find ancestor for 'f3d' copied from 'f3b'!
+
+  $ hg cat f2c
+  c2e
+
+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:
+   f1b
+   f1e
+  note: possible conflict - f3a was renamed multiple times to:
+   f3b
+   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
+BROKEN: f1f should have the new content from f1b (i.e. "c1c")
+  $ cat f1f
+  c1a
+
+Test the case A.5 (copy+modify case, f1x).
+
+  $ hg up -q "desc("C0")"
+BROKEN: We should get a merge conflict from the 3-way merge between f1b in C0
+(content "c1c") and f1g in G0 (content "c1g") with f1a in A0 as base (content
+"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
+
+  $ hg log -CGv --patch --git
+  @  changeset:   13:ef3adf6c20a4
+  |  tag:         tip
+  |  parent:      2:f58c7e2b28fa
+  |  user:        test
+  |  date:        Thu Jan 01 00:00:00 1970 +0000
+  |  files:       f1g
+  |  description:
+  |  G1
+  |
+  |
+  |  diff --git a/f1g b/f1g
+  |  new file mode 100644
+  |  --- /dev/null
+  |  +++ b/f1g
+  |  @@ -0,0 +1,1 @@
+  |  +c1g
+  |
+  | o  changeset:   12:b5542d755b54
+  |/   parent:      2:f58c7e2b28fa
+  |    user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    files:       f1f
+  |    description:
+  |    F1
+  |
+  |
+  |    diff --git a/f1f b/f1f
+  |    new file mode 100644
+  |    --- /dev/null
+  |    +++ b/f1f
+  |    @@ -0,0 +1,1 @@
+  |    +c1a
+  |
+  | o  changeset:   11:f8a162271246
+  |/   parent:      2:f58c7e2b28fa
+  |    user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    files:       f1e f2c f3e f4a f4e f5a f5b
+  |    copies:      f4e (f4a) f5b (f5a)
+  |    description:
+  |    E1
+  |
+  |
+  |    diff --git a/f1e b/f1e
+  |    new file mode 100644
+  |    --- /dev/null
+  |    +++ b/f1e
+  |    @@ -0,0 +1,1 @@
+  |    +c1a
+  |    diff --git a/f2c b/f2c
+  |    --- a/f2c
+  |    +++ b/f2c
+  |    @@ -1,1 +1,1 @@
+  |    -c2a
+  |    +c2e
+  |    diff --git a/f3e b/f3e
+  |    new file mode 100644
+  |    --- /dev/null
+  |    +++ b/f3e
+  |    @@ -0,0 +1,1 @@
+  |    +c3a
+  |    diff --git a/f4a b/f4e
+  |    rename from f4a
+  |    rename to f4e
+  |    diff --git a/f5a b/f5b
+  |    rename from f5a
+  |    rename to f5b
+  |
+  | o  changeset:   10:93ee502e8b0a
+  | |  user:        test
+  | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | |  files:       f3d f4e
+  | |  description:
+  | |  D2
+  | |
+  | |
+  | |  diff --git a/f3d b/f3d
+  | |  new file mode 100644
+  | |  --- /dev/null
+  | |  +++ b/f3d
+  | |  @@ -0,0 +1,1 @@
+  | |  +c3a
+  | |  diff --git a/f4e b/f4e
+  | |  --- a/f4e
+  | |  +++ b/f4e
+  | |  @@ -1,1 +1,1 @@
+  | |  -c4a
+  | |  +c4d
+  | |
+  | o  changeset:   9:539cf145f496
+  | |  parent:      6:6bd1736cab86
+  | |  user:        test
+  | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | |  files:       f1e f2a f2c f5a f5b
+  | |  copies:      f2c (f2a) f5a (f5b)
+  | |  description:
+  | |  C2
+  | |
+  | |
+  | |  diff --git a/f1e b/f1e
+  | |  --- a/f1e
+  | |  +++ b/f1e
+  | |  @@ -1,1 +1,1 @@
+  | |  -c1a
+  | |  +c1c
+  | |  diff --git a/f2a b/f2c
+  | |  rename from f2a
+  | |  rename to f2c
+  | |  diff --git a/f5b b/f5a
+  | |  rename from f5b
+  | |  rename to f5a
+  | |  --- a/f5b
+  | |  +++ b/f5a
+  | |  @@ -1,1 +1,1 @@
+  | |  -c5a
+  | |  +c5c
+  | |
+  | | o  changeset:   8:ba67f08fb15a
+  | | |  parent:      0:11f7a1b56675
+  | | |  user:        test
+  | | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | | |  files:       f1g
+  | | |  copies:      f1g (f1a)
+  | | |  description:
+  | | |  G0
+  | | |
+  | | |
+  | | |  diff --git a/f1a b/f1g
+  | | |  copy from f1a
+  | | |  copy to f1g
+  | | |  --- a/f1a
+  | | |  +++ b/f1g
+  | | |  @@ -1,1 +1,1 @@
+  | | |  -c1a
+  | | |  +c1g
+  | | |
+  | | | o  changeset:   7:d376ab0d7fda
+  | | |/   parent:      0:11f7a1b56675
+  | | |    user:        test
+  | | |    date:        Thu Jan 01 00:00:00 1970 +0000
+  | | |    files:       f1f
+  | | |    copies:      f1f (f1a)
+  | | |    description:
+  | | |    F0
+  | | |
+  | | |
+  | | |    diff --git a/f1a b/f1f
+  | | |    copy from f1a
+  | | |    copy to f1f
+  | | |
+  | o |  changeset:   6:6bd1736cab86
+  | |/   parent:      0:11f7a1b56675
+  | |    user:        test
+  | |    date:        Thu Jan 01 00:00:00 1970 +0000
+  | |    files:       f1a f1e f2a f3a f3e f4a f4e f5a f5b
+  | |    copies:      f1e (f1a) f3e (f3a) f4e (f4a) f5b (f5a)
+  | |    description:
+  | |    E0
+  | |
+  | |
+  | |    diff --git a/f1a b/f1e
+  | |    rename from f1a
+  | |    rename to f1e
+  | |    diff --git a/f2a b/f2a
+  | |    --- a/f2a
+  | |    +++ b/f2a
+  | |    @@ -1,1 +1,1 @@
+  | |    -c2a
+  | |    +c2e
+  | |    diff --git a/f3a b/f3e
+  | |    rename from f3a
+  | |    rename to f3e
+  | |    diff --git a/f4a b/f4e
+  | |    rename from f4a
+  | |    rename to f4e
+  | |    diff --git a/f5a b/f5b
+  | |    rename from f5a
+  | |    rename to f5b
+  | |
+  | | o  changeset:   5:560daee679da
+  | | |  user:        test
+  | | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | | |  files:       f3d f4a
+  | | |  description:
+  | | |  D1
+  | | |
+  | | |
+  | | |  diff --git a/f3d b/f3d
+  | | |  new file mode 100644
+  | | |  --- /dev/null
+  | | |  +++ b/f3d
+  | | |  @@ -0,0 +1,1 @@
+  | | |  +c3a
+  | | |  diff --git a/f4a b/f4a
+  | | |  --- a/f4a
+  | | |  +++ b/f4a
+  | | |  @@ -1,1 +1,1 @@
+  | | |  -c4a
+  | | |  +c4d
+  | | |
+  | | o  changeset:   4:c9763722f9bd
+  | |/   parent:      0:11f7a1b56675
+  | |    user:        test
+  | |    date:        Thu Jan 01 00:00:00 1970 +0000
+  | |    files:       f1a f2a f2c f5a
+  | |    copies:      f2c (f2a)
+  | |    description:
+  | |    C1
+  | |
+  | |
+  | |    diff --git a/f1a b/f1a
+  | |    --- a/f1a
+  | |    +++ b/f1a
+  | |    @@ -1,1 +1,1 @@
+  | |    -c1a
+  | |    +c1c
+  | |    diff --git a/f2a b/f2c
+  | |    rename from f2a
+  | |    rename to f2c
+  | |    diff --git a/f5a b/f5a
+  | |    --- a/f5a
+  | |    +++ b/f5a
+  | |    @@ -1,1 +1,1 @@
+  | |    -c5a
+  | |    +c5c
+  | |
+  +---o  changeset:   3:b69f5839d2d9
+  | |    user:        test
+  | |    date:        Thu Jan 01 00:00:00 1970 +0000
+  | |    files:       f3b f3d f4a
+  | |    copies:      f3d (f3b)
+  | |    description:
+  | |    D0
+  | |
+  | |
+  | |    diff --git a/f3b b/f3d
+  | |    rename from f3b
+  | |    rename to f3d
+  | |    diff --git a/f4a b/f4a
+  | |    --- a/f4a
+  | |    +++ b/f4a
+  | |    @@ -1,1 +1,1 @@
+  | |    -c4a
+  | |    +c4d
+  | |
+  o |  changeset:   2:f58c7e2b28fa
+  | |  user:        test
+  | |  date:        Thu Jan 01 00:00:00 1970 +0000
+  | |  files:       f1b f2a f2c f5a f5b
+  | |  copies:      f2c (f2a) f5a (f5b)
+  | |  description:
+  | |  C0
+  | |
+  | |
+  | |  diff --git a/f1b b/f1b
+  | |  --- a/f1b
+  | |  +++ b/f1b
+  | |  @@ -1,1 +1,1 @@
+  | |  -c1a
+  | |  +c1c
+  | |  diff --git a/f2a b/f2c
+  | |  rename from f2a
+  | |  rename to f2c
+  | |  diff --git a/f5b b/f5a
+  | |  rename from f5b
+  | |  rename to f5a
+  | |  --- a/f5b
+  | |  +++ b/f5a
+  | |  @@ -1,1 +1,1 @@
+  | |  -c5a
+  | |  +c5c
+  | |
+  o |  changeset:   1:3d7bba921b5d
+  |/   user:        test
+  |    date:        Thu Jan 01 00:00:00 1970 +0000
+  |    files:       f1a f1b f3a f3b f5a f5b
+  |    copies:      f1b (f1a) f3b (f3a) f5b (f5a)
+  |    description:
+  |    B0
+  |
+  |
+  |    diff --git a/f1a b/f1b
+  |    rename from f1a
+  |    rename to f1b
+  |    diff --git a/f3a b/f3b
+  |    rename from f3a
+  |    rename to f3b
+  |    diff --git a/f5a b/f5b
+  |    rename from f5a
+  |    rename to f5b
+  |
+  o  changeset:   0:11f7a1b56675
+     user:        test
+     date:        Thu Jan 01 00:00:00 1970 +0000
+     files:       f1a f2a f3a f4a f5a
+     description:
+     A0
+  
+  
+     diff --git a/f1a b/f1a
+     new file mode 100644
+     --- /dev/null
+     +++ b/f1a
+     @@ -0,0 +1,1 @@
+     +c1a
+     diff --git a/f2a b/f2a
+     new file mode 100644
+     --- /dev/null
+     +++ b/f2a
+     @@ -0,0 +1,1 @@
+     +c2a
+     diff --git a/f3a b/f3a
+     new file mode 100644
+     --- /dev/null
+     +++ b/f3a
+     @@ -0,0 +1,1 @@
+     +c3a
+     diff --git a/f4a b/f4a
+     new file mode 100644
+     --- /dev/null
+     +++ b/f4a
+     @@ -0,0 +1,1 @@
+     +c4a
+     diff --git a/f5a b/f5a
+     new file mode 100644
+     --- /dev/null
+     +++ b/f5a
+     @@ -0,0 +1,1 @@
+     +c5a
+  
+Check superfluous filemerge of files renamed in the past but untouched by graft
+
+  $ echo a > a
+  $ hg ci -qAma
+  $ hg mv a b
+  $ echo b > b
+  $ hg ci -qAmb
+  $ echo c > c
+  $ hg ci -qAmc
+  $ hg up -q .~2
+  $ hg graft tip -qt:fail
+
+  $ cd ..
+
+Graft a change into a new file previously grafted into a renamed directory
+
+  $ hg init dirmovenewfile
+  $ cd dirmovenewfile
+  $ mkdir a
+  $ echo a > a/a
+  $ hg ci -qAma
+  $ echo x > a/x
+  $ hg ci -qAmx
+  $ hg up -q 0
+  $ hg mv -q a b
+  $ hg ci -qAmb
+  $ hg graft -q 1 # a/x grafted as b/x, but no copy information recorded
+  $ hg up -q 1
+  $ echo y > a/x
+  $ hg ci -qAmy
+  $ hg up -q 3
+  $ hg graft -q 4
+  $ hg status --change .
+  M b/x
+
+Prepare for test of skipped changesets and how merges can influence it:
+
+  $ hg merge -q -r 1 --tool :local
+  $ hg ci -m m
+  $ echo xx >> b/x
+  $ hg ci -m xx
+
+  $ hg log -G -T '{rev} {desc|firstline}'
+  @  7 xx
+  |
+  o    6 m
+  |\
+  | o  5 y
+  | |
+  +---o  4 y
+  | |
+  | o  3 x
+  | |
+  | o  2 b
+  | |
+  o |  1 x
+  |/
+  o  0 a
+  
+Grafting of plain changes correctly detects that 3 and 5 should be skipped:
+
+  $ hg up -qCr 4
+  $ hg graft --tool :local -r 2::5
+  skipping already grafted revision 3:ca093ca2f1d9 (was grafted from 1:13ec5badbf2a)
+  skipping already grafted revision 5:43e9eb70dab0 (was grafted from 4:6c9a1289e5f1)
+  grafting 2:42127f193bcd "b"
+
+Extending the graft range to include a (skipped) merge of 3 will not prevent us from
+also detecting that both 3 and 5 should be skipped:
+
+  $ hg up -qCr 4
+  $ hg graft --tool :local -r 2::7
+  skipping ungraftable merge revision 6
+  skipping already grafted revision 3:ca093ca2f1d9 (was grafted from 1:13ec5badbf2a)
+  skipping already grafted revision 5:43e9eb70dab0 (was grafted from 4:6c9a1289e5f1)
+  grafting 2:42127f193bcd "b"
+  grafting 7:d3c3f2b38ecc "xx"
+  note: graft of 7:d3c3f2b38ecc created no changes to commit
+
+  $ cd ..
+
+Grafted revision should be warned and skipped only once. (issue6024)
+
+  $ mkdir issue6024
+  $ cd issue6024
+
+  $ hg init base
+  $ cd base
+  $ touch x
+  $ hg commit -qAminit
+  $ echo a > x
+  $ hg commit -mchange
+  $ hg update -q 0
+  $ hg graft -r 1
+  grafting 1:a0b923c546aa "change" (tip)
+  $ cd ..
+
+  $ hg clone -qr 2 base clone
+  $ cd clone
+  $ hg pull -q
+  $ hg merge -q 2
+  $ hg commit -mmerge
+  $ hg update -q 0
+  $ hg graft -r 1
+  grafting 1:04fc6d444368 "change"
+  $ hg update -q 3
+  $ hg log -G -T '{rev}:{node|shortest} <- {extras.source|shortest}\n'
+  o  4:4e16 <- a0b9
+  |
+  | @    3:f0ac <-
+  | |\
+  +---o  2:a0b9 <-
+  | |
+  | o  1:04fc <- a0b9
+  |/
+  o  0:7848 <-
+  
+
+ the source of rev 4 is an ancestor of the working parent, and was also
+ grafted as rev 1. it should be stripped from the target revisions only once.
+
+  $ hg graft -r 4
+  skipping already grafted revision 4:4e16bab40c9c (1:04fc6d444368 also has origin 2:a0b923c546aa)
+  [255]
+
+  $ cd ../..
--- a/tests/test-graft.t	Fri Dec 27 15:39:48 2019 -0800
+++ b/tests/test-graft.t	Fri Dec 27 15:53:16 2019 -0800
@@ -922,735 +922,3 @@
   |/
   o  0
   
-Graft from behind a move or rename
-==================================
-
-NOTE: This is affected by issue5343, and will need updating when it's fixed
-
-Consider this topology for a regular graft:
-
-o c1
-|
-| o c2
-| |
-| o ca # stands for "common ancestor"
-|/
-o cta # stands for "common topological ancestor"
-
-Note that in issue5343, ca==cta.
-
-The following table shows the possible cases. Here, "x->y" and, equivalently,
-"y<-x", where x is an ancestor of y, means that some copy happened from x to y.
-
-name | c1<-cta | cta<->ca | ca->c2
-A.0  |         |          |
-A.1  |    X    |          |
-A.2  |         |     X    |
-A.3  |         |          |   X
-A.4  |    X    |     X    |
-A.5  |    X    |          |   X
-A.6  |         |     X    |   X
-A.7  |    X    |     X    |   X
-
-A.0 is trivial, and doesn't need copy tracking.
-For A.1, a forward rename is recorded in the c1 pass, to be followed later.
-In A.2, the rename is recorded in the c2 pass and followed backwards.
-A.3 is recorded in the c2 pass as a forward rename to be duplicated on target.
-In A.4, both passes of checkcopies record incomplete renames, which are
-then joined in mergecopies to record a rename to be followed.
-In A.5 and A.7, the c1 pass records an incomplete rename, while the c2 pass
-records an incomplete divergence. The incomplete rename is then joined to the
-appropriate side of the incomplete divergence, and the result is recorded as a
-divergence. The code doesn't distinguish at all between these two cases, since
-the end result of them is the same: an incomplete divergence joined with an
-incomplete rename into a divergence.
-Finally, A.6 records a divergence entirely in the c2 pass.
-
-A.4 has a degenerate case a<-b<-a->a, where checkcopies isn't needed at all.
-A.5 has a special case a<-b<-b->a, which is treated like a<-b->a in a merge.
-A.5 has issue5343 as a special case.
-A.6 has a special case a<-a<-b->a. Here, checkcopies will find a spurious
-incomplete divergence, which is in fact complete. This is handled later in
-mergecopies.
-A.7 has 4 special cases: a<-b<-a->b (the "ping-pong" case), a<-b<-c->b,
-a<-b<-a->c and a<-b<-c->a. Of these, only the "ping-pong" case is interesting,
-the others are fairly trivial (a<-b<-c->b and a<-b<-a->c proceed like the base
-case, a<-b<-c->a is treated the same as a<-b<-b->a).
-
-f5a therefore tests the "ping-pong" rename case, where a file is renamed to the
-same name on both branches, then the rename is backed out on one branch, and
-the backout is grafted to the other branch. This creates a challenging rename
-sequence of a<-b<-a->b in the graft target, topological CA, graft CA and graft
-source, respectively. Since rename detection will run on the c1 side for such a
-sequence (as for technical reasons, we split the c1 and c2 sides not at the
-graft CA, but rather at the topological CA), it will pick up a false rename,
-and cause a spurious merge conflict. This false rename is always exactly the
-reverse of the true rename that would be detected on the c2 side, so we can
-correct for it by detecting this condition and reversing as necessary.
-
-First, set up the repository with commits to be grafted
-
-  $ hg init ../graftmove
-  $ cd ../graftmove
-  $ echo c1a > f1a
-  $ echo c2a > f2a
-  $ echo c3a > f3a
-  $ echo c4a > f4a
-  $ echo c5a > f5a
-  $ hg ci -qAm A0
-  $ hg mv f1a f1b
-  $ hg mv f3a f3b
-  $ hg mv f5a f5b
-  $ hg ci -qAm B0
-  $ echo c1c > f1b
-  $ hg mv f2a f2c
-  $ hg mv f5b f5a
-  $ echo c5c > f5a
-  $ hg ci -qAm C0
-  $ hg mv f3b f3d
-  $ echo c4d > f4a
-  $ hg ci -qAm D0
-  $ hg log -G
-  @  changeset:   3:b69f5839d2d9
-  |  tag:         tip
-  |  user:        test
-  |  date:        Thu Jan 01 00:00:00 1970 +0000
-  |  summary:     D0
-  |
-  o  changeset:   2:f58c7e2b28fa
-  |  user:        test
-  |  date:        Thu Jan 01 00:00:00 1970 +0000
-  |  summary:     C0
-  |
-  o  changeset:   1:3d7bba921b5d
-  |  user:        test
-  |  date:        Thu Jan 01 00:00:00 1970 +0000
-  |  summary:     B0
-  |
-  o  changeset:   0:11f7a1b56675
-     user:        test
-     date:        Thu Jan 01 00:00:00 1970 +0000
-     summary:     A0
-  
-
-Test the cases A.2 (f1x), A.3 (f2x) and a special case of A.6 (f5x) where the
-two renames actually converge to the same name (thus no actual divergence).
-
-  $ hg up -q 'desc("A0")'
-  $ HGEDITOR="echo C1 >" hg graft -r 'desc("C0")' --edit
-  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
-  A f2c
-  R f2a
-  $ hg cat f1a
-  c1c
-  $ hg cat f1b
-  f1b: no such file in rev c9763722f9bd
-  [1]
-
-Test the cases A.0 (f4x) and A.6 (f3x)
-
-  $ HGEDITOR="echo D1 >" hg graft -r 'desc("D0")' --edit
-  grafting 3:b69f5839d2d9 "D0"
-  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
-
-  $ hg up -q "min(desc("A0"))"
-  $ hg mv f1a f1e
-  $ echo c2e > f2a
-  $ hg mv f3a f3e
-  $ hg mv f4a f4e
-  $ hg mv f5a f5b
-  $ hg ci -qAm "E0"
-  $ hg up -q "min(desc("A0"))"
-  $ hg cp f1a f1f
-  $ hg ci -qAm "F0"
-  $ hg up -q "min(desc("A0"))"
-  $ hg cp f1a f1g
-  $ echo c1g > f1g
-  $ hg ci -qAm "G0"
-  $ hg log -G
-  @  changeset:   8:ba67f08fb15a
-  |  tag:         tip
-  |  parent:      0:11f7a1b56675
-  |  user:        test
-  |  date:        Thu Jan 01 00:00:00 1970 +0000
-  |  summary:     G0
-  |
-  | o  changeset:   7:d376ab0d7fda
-  |/   parent:      0:11f7a1b56675
-  |    user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    summary:     F0
-  |
-  | o  changeset:   6:6bd1736cab86
-  |/   parent:      0:11f7a1b56675
-  |    user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    summary:     E0
-  |
-  | o  changeset:   5:560daee679da
-  | |  user:        test
-  | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | |  summary:     D1
-  | |
-  | o  changeset:   4:c9763722f9bd
-  |/   parent:      0:11f7a1b56675
-  |    user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    summary:     C1
-  |
-  | o  changeset:   3:b69f5839d2d9
-  | |  user:        test
-  | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | |  summary:     D0
-  | |
-  | o  changeset:   2:f58c7e2b28fa
-  | |  user:        test
-  | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | |  summary:     C0
-  | |
-  | o  changeset:   1:3d7bba921b5d
-  |/   user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    summary:     B0
-  |
-  o  changeset:   0:11f7a1b56675
-     user:        test
-     date:        Thu Jan 01 00:00:00 1970 +0000
-     summary:     A0
-  
-
-Test the cases A.4 (f1x), the "ping-pong" special case of A.7 (f5x),
-and A.3 with a local content change to be preserved (f2x).
-
-  $ hg up -q "desc("E0")"
-  $ HGEDITOR="echo C2 >" hg graft -r 'desc("C0")' --edit
-  grafting 2:f58c7e2b28fa "C0"
-  merging f1e and f1b to f1e
-  merging f2a and f2c to f2c
-
-Test the cases A.1 (f4x) and A.7 (f3x).
-
-  $ HGEDITOR="echo D2 >" hg graft -r 'desc("D0")' --edit
-  grafting 3:b69f5839d2d9 "D0"
-  note: possible conflict - f3b was renamed multiple times to:
-   f3d
-   f3e
-  merging f4e and f4a to f4e
-  warning: can't find ancestor for 'f3d' copied from 'f3b'!
-
-  $ hg cat f2c
-  c2e
-
-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:
-   f1b
-   f1e
-  note: possible conflict - f3a was renamed multiple times to:
-   f3b
-   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
-BROKEN: f1f should have the new content from f1b (i.e. "c1c")
-  $ cat f1f
-  c1a
-
-Test the case A.5 (copy+modify case, f1x).
-
-  $ hg up -q "desc("C0")"
-BROKEN: We should get a merge conflict from the 3-way merge between f1b in C0
-(content "c1c") and f1g in G0 (content "c1g") with f1a in A0 as base (content
-"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
-
-  $ hg log -CGv --patch --git
-  @  changeset:   13:ef3adf6c20a4
-  |  tag:         tip
-  |  parent:      2:f58c7e2b28fa
-  |  user:        test
-  |  date:        Thu Jan 01 00:00:00 1970 +0000
-  |  files:       f1g
-  |  description:
-  |  G1
-  |
-  |
-  |  diff --git a/f1g b/f1g
-  |  new file mode 100644
-  |  --- /dev/null
-  |  +++ b/f1g
-  |  @@ -0,0 +1,1 @@
-  |  +c1g
-  |
-  | o  changeset:   12:b5542d755b54
-  |/   parent:      2:f58c7e2b28fa
-  |    user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    files:       f1f
-  |    description:
-  |    F1
-  |
-  |
-  |    diff --git a/f1f b/f1f
-  |    new file mode 100644
-  |    --- /dev/null
-  |    +++ b/f1f
-  |    @@ -0,0 +1,1 @@
-  |    +c1a
-  |
-  | o  changeset:   11:f8a162271246
-  |/   parent:      2:f58c7e2b28fa
-  |    user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    files:       f1e f2c f3e f4a f4e f5a f5b
-  |    copies:      f4e (f4a) f5b (f5a)
-  |    description:
-  |    E1
-  |
-  |
-  |    diff --git a/f1e b/f1e
-  |    new file mode 100644
-  |    --- /dev/null
-  |    +++ b/f1e
-  |    @@ -0,0 +1,1 @@
-  |    +c1a
-  |    diff --git a/f2c b/f2c
-  |    --- a/f2c
-  |    +++ b/f2c
-  |    @@ -1,1 +1,1 @@
-  |    -c2a
-  |    +c2e
-  |    diff --git a/f3e b/f3e
-  |    new file mode 100644
-  |    --- /dev/null
-  |    +++ b/f3e
-  |    @@ -0,0 +1,1 @@
-  |    +c3a
-  |    diff --git a/f4a b/f4e
-  |    rename from f4a
-  |    rename to f4e
-  |    diff --git a/f5a b/f5b
-  |    rename from f5a
-  |    rename to f5b
-  |
-  | o  changeset:   10:93ee502e8b0a
-  | |  user:        test
-  | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | |  files:       f3d f4e
-  | |  description:
-  | |  D2
-  | |
-  | |
-  | |  diff --git a/f3d b/f3d
-  | |  new file mode 100644
-  | |  --- /dev/null
-  | |  +++ b/f3d
-  | |  @@ -0,0 +1,1 @@
-  | |  +c3a
-  | |  diff --git a/f4e b/f4e
-  | |  --- a/f4e
-  | |  +++ b/f4e
-  | |  @@ -1,1 +1,1 @@
-  | |  -c4a
-  | |  +c4d
-  | |
-  | o  changeset:   9:539cf145f496
-  | |  parent:      6:6bd1736cab86
-  | |  user:        test
-  | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | |  files:       f1e f2a f2c f5a f5b
-  | |  copies:      f2c (f2a) f5a (f5b)
-  | |  description:
-  | |  C2
-  | |
-  | |
-  | |  diff --git a/f1e b/f1e
-  | |  --- a/f1e
-  | |  +++ b/f1e
-  | |  @@ -1,1 +1,1 @@
-  | |  -c1a
-  | |  +c1c
-  | |  diff --git a/f2a b/f2c
-  | |  rename from f2a
-  | |  rename to f2c
-  | |  diff --git a/f5b b/f5a
-  | |  rename from f5b
-  | |  rename to f5a
-  | |  --- a/f5b
-  | |  +++ b/f5a
-  | |  @@ -1,1 +1,1 @@
-  | |  -c5a
-  | |  +c5c
-  | |
-  | | o  changeset:   8:ba67f08fb15a
-  | | |  parent:      0:11f7a1b56675
-  | | |  user:        test
-  | | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | | |  files:       f1g
-  | | |  copies:      f1g (f1a)
-  | | |  description:
-  | | |  G0
-  | | |
-  | | |
-  | | |  diff --git a/f1a b/f1g
-  | | |  copy from f1a
-  | | |  copy to f1g
-  | | |  --- a/f1a
-  | | |  +++ b/f1g
-  | | |  @@ -1,1 +1,1 @@
-  | | |  -c1a
-  | | |  +c1g
-  | | |
-  | | | o  changeset:   7:d376ab0d7fda
-  | | |/   parent:      0:11f7a1b56675
-  | | |    user:        test
-  | | |    date:        Thu Jan 01 00:00:00 1970 +0000
-  | | |    files:       f1f
-  | | |    copies:      f1f (f1a)
-  | | |    description:
-  | | |    F0
-  | | |
-  | | |
-  | | |    diff --git a/f1a b/f1f
-  | | |    copy from f1a
-  | | |    copy to f1f
-  | | |
-  | o |  changeset:   6:6bd1736cab86
-  | |/   parent:      0:11f7a1b56675
-  | |    user:        test
-  | |    date:        Thu Jan 01 00:00:00 1970 +0000
-  | |    files:       f1a f1e f2a f3a f3e f4a f4e f5a f5b
-  | |    copies:      f1e (f1a) f3e (f3a) f4e (f4a) f5b (f5a)
-  | |    description:
-  | |    E0
-  | |
-  | |
-  | |    diff --git a/f1a b/f1e
-  | |    rename from f1a
-  | |    rename to f1e
-  | |    diff --git a/f2a b/f2a
-  | |    --- a/f2a
-  | |    +++ b/f2a
-  | |    @@ -1,1 +1,1 @@
-  | |    -c2a
-  | |    +c2e
-  | |    diff --git a/f3a b/f3e
-  | |    rename from f3a
-  | |    rename to f3e
-  | |    diff --git a/f4a b/f4e
-  | |    rename from f4a
-  | |    rename to f4e
-  | |    diff --git a/f5a b/f5b
-  | |    rename from f5a
-  | |    rename to f5b
-  | |
-  | | o  changeset:   5:560daee679da
-  | | |  user:        test
-  | | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | | |  files:       f3d f4a
-  | | |  description:
-  | | |  D1
-  | | |
-  | | |
-  | | |  diff --git a/f3d b/f3d
-  | | |  new file mode 100644
-  | | |  --- /dev/null
-  | | |  +++ b/f3d
-  | | |  @@ -0,0 +1,1 @@
-  | | |  +c3a
-  | | |  diff --git a/f4a b/f4a
-  | | |  --- a/f4a
-  | | |  +++ b/f4a
-  | | |  @@ -1,1 +1,1 @@
-  | | |  -c4a
-  | | |  +c4d
-  | | |
-  | | o  changeset:   4:c9763722f9bd
-  | |/   parent:      0:11f7a1b56675
-  | |    user:        test
-  | |    date:        Thu Jan 01 00:00:00 1970 +0000
-  | |    files:       f1a f2a f2c f5a
-  | |    copies:      f2c (f2a)
-  | |    description:
-  | |    C1
-  | |
-  | |
-  | |    diff --git a/f1a b/f1a
-  | |    --- a/f1a
-  | |    +++ b/f1a
-  | |    @@ -1,1 +1,1 @@
-  | |    -c1a
-  | |    +c1c
-  | |    diff --git a/f2a b/f2c
-  | |    rename from f2a
-  | |    rename to f2c
-  | |    diff --git a/f5a b/f5a
-  | |    --- a/f5a
-  | |    +++ b/f5a
-  | |    @@ -1,1 +1,1 @@
-  | |    -c5a
-  | |    +c5c
-  | |
-  +---o  changeset:   3:b69f5839d2d9
-  | |    user:        test
-  | |    date:        Thu Jan 01 00:00:00 1970 +0000
-  | |    files:       f3b f3d f4a
-  | |    copies:      f3d (f3b)
-  | |    description:
-  | |    D0
-  | |
-  | |
-  | |    diff --git a/f3b b/f3d
-  | |    rename from f3b
-  | |    rename to f3d
-  | |    diff --git a/f4a b/f4a
-  | |    --- a/f4a
-  | |    +++ b/f4a
-  | |    @@ -1,1 +1,1 @@
-  | |    -c4a
-  | |    +c4d
-  | |
-  o |  changeset:   2:f58c7e2b28fa
-  | |  user:        test
-  | |  date:        Thu Jan 01 00:00:00 1970 +0000
-  | |  files:       f1b f2a f2c f5a f5b
-  | |  copies:      f2c (f2a) f5a (f5b)
-  | |  description:
-  | |  C0
-  | |
-  | |
-  | |  diff --git a/f1b b/f1b
-  | |  --- a/f1b
-  | |  +++ b/f1b
-  | |  @@ -1,1 +1,1 @@
-  | |  -c1a
-  | |  +c1c
-  | |  diff --git a/f2a b/f2c
-  | |  rename from f2a
-  | |  rename to f2c
-  | |  diff --git a/f5b b/f5a
-  | |  rename from f5b
-  | |  rename to f5a
-  | |  --- a/f5b
-  | |  +++ b/f5a
-  | |  @@ -1,1 +1,1 @@
-  | |  -c5a
-  | |  +c5c
-  | |
-  o |  changeset:   1:3d7bba921b5d
-  |/   user:        test
-  |    date:        Thu Jan 01 00:00:00 1970 +0000
-  |    files:       f1a f1b f3a f3b f5a f5b
-  |    copies:      f1b (f1a) f3b (f3a) f5b (f5a)
-  |    description:
-  |    B0
-  |
-  |
-  |    diff --git a/f1a b/f1b
-  |    rename from f1a
-  |    rename to f1b
-  |    diff --git a/f3a b/f3b
-  |    rename from f3a
-  |    rename to f3b
-  |    diff --git a/f5a b/f5b
-  |    rename from f5a
-  |    rename to f5b
-  |
-  o  changeset:   0:11f7a1b56675
-     user:        test
-     date:        Thu Jan 01 00:00:00 1970 +0000
-     files:       f1a f2a f3a f4a f5a
-     description:
-     A0
-  
-  
-     diff --git a/f1a b/f1a
-     new file mode 100644
-     --- /dev/null
-     +++ b/f1a
-     @@ -0,0 +1,1 @@
-     +c1a
-     diff --git a/f2a b/f2a
-     new file mode 100644
-     --- /dev/null
-     +++ b/f2a
-     @@ -0,0 +1,1 @@
-     +c2a
-     diff --git a/f3a b/f3a
-     new file mode 100644
-     --- /dev/null
-     +++ b/f3a
-     @@ -0,0 +1,1 @@
-     +c3a
-     diff --git a/f4a b/f4a
-     new file mode 100644
-     --- /dev/null
-     +++ b/f4a
-     @@ -0,0 +1,1 @@
-     +c4a
-     diff --git a/f5a b/f5a
-     new file mode 100644
-     --- /dev/null
-     +++ b/f5a
-     @@ -0,0 +1,1 @@
-     +c5a
-  
-Check superfluous filemerge of files renamed in the past but untouched by graft
-
-  $ echo a > a
-  $ hg ci -qAma
-  $ hg mv a b
-  $ echo b > b
-  $ hg ci -qAmb
-  $ echo c > c
-  $ hg ci -qAmc
-  $ hg up -q .~2
-  $ hg graft tip -qt:fail
-
-  $ cd ..
-
-Graft a change into a new file previously grafted into a renamed directory
-
-  $ hg init dirmovenewfile
-  $ cd dirmovenewfile
-  $ mkdir a
-  $ echo a > a/a
-  $ hg ci -qAma
-  $ echo x > a/x
-  $ hg ci -qAmx
-  $ hg up -q 0
-  $ hg mv -q a b
-  $ hg ci -qAmb
-  $ hg graft -q 1 # a/x grafted as b/x, but no copy information recorded
-  $ hg up -q 1
-  $ echo y > a/x
-  $ hg ci -qAmy
-  $ hg up -q 3
-  $ hg graft -q 4
-  $ hg status --change .
-  M b/x
-
-Prepare for test of skipped changesets and how merges can influence it:
-
-  $ hg merge -q -r 1 --tool :local
-  $ hg ci -m m
-  $ echo xx >> b/x
-  $ hg ci -m xx
-
-  $ hg log -G -T '{rev} {desc|firstline}'
-  @  7 xx
-  |
-  o    6 m
-  |\
-  | o  5 y
-  | |
-  +---o  4 y
-  | |
-  | o  3 x
-  | |
-  | o  2 b
-  | |
-  o |  1 x
-  |/
-  o  0 a
-  
-Grafting of plain changes correctly detects that 3 and 5 should be skipped:
-
-  $ hg up -qCr 4
-  $ hg graft --tool :local -r 2::5
-  skipping already grafted revision 3:ca093ca2f1d9 (was grafted from 1:13ec5badbf2a)
-  skipping already grafted revision 5:43e9eb70dab0 (was grafted from 4:6c9a1289e5f1)
-  grafting 2:42127f193bcd "b"
-
-Extending the graft range to include a (skipped) merge of 3 will not prevent us from
-also detecting that both 3 and 5 should be skipped:
-
-  $ hg up -qCr 4
-  $ hg graft --tool :local -r 2::7
-  skipping ungraftable merge revision 6
-  skipping already grafted revision 3:ca093ca2f1d9 (was grafted from 1:13ec5badbf2a)
-  skipping already grafted revision 5:43e9eb70dab0 (was grafted from 4:6c9a1289e5f1)
-  grafting 2:42127f193bcd "b"
-  grafting 7:d3c3f2b38ecc "xx"
-  note: graft of 7:d3c3f2b38ecc created no changes to commit
-
-  $ cd ..
-
-Grafted revision should be warned and skipped only once. (issue6024)
-
-  $ mkdir issue6024
-  $ cd issue6024
-
-  $ hg init base
-  $ cd base
-  $ touch x
-  $ hg commit -qAminit
-  $ echo a > x
-  $ hg commit -mchange
-  $ hg update -q 0
-  $ hg graft -r 1
-  grafting 1:a0b923c546aa "change" (tip)
-  $ cd ..
-
-  $ hg clone -qr 2 base clone
-  $ cd clone
-  $ hg pull -q
-  $ hg merge -q 2
-  $ hg commit -mmerge
-  $ hg update -q 0
-  $ hg graft -r 1
-  grafting 1:04fc6d444368 "change"
-  $ hg update -q 3
-  $ hg log -G -T '{rev}:{node|shortest} <- {extras.source|shortest}\n'
-  o  4:4e16 <- a0b9
-  |
-  | @    3:f0ac <-
-  | |\
-  +---o  2:a0b9 <-
-  | |
-  | o  1:04fc <- a0b9
-  |/
-  o  0:7848 <-
-  
-
- the source of rev 4 is an ancestor of the working parent, and was also
- grafted as rev 1. it should be stripped from the target revisions only once.
-
-  $ hg graft -r 4
-  skipping already grafted revision 4:4e16bab40c9c (1:04fc6d444368 also has origin 2:a0b923c546aa)
-  [255]
-
-  $ cd ../..