tests/test-import-merge.t

changegroup: cg3 has two empty groups *after* manifests

changegroup.getchunks() determines the end of the stream by looking
for an empty chunk group (two consecutive empty chunks). It ignores
empty groups in the first two groups. Changegroup 3 introduced an
empty chunk between the manifests and the files, which confuses
getchunks(). Since it comes after the first two, getchunks() will stop
there.

Fix by rewriting getchunks so it first counts two groups (empty or
not) and then keeps antostarts counting empty groups. With this counting,
changegroup 1 and 2 have exactly one empty group after the first two
groups, while changegroup 3 has two (one for directories and one for
files).

It's a little hard to test this at this point, but I have verified
that this patch fixes narrowhg (which was broken before this
patch). Also, future patches will fix "hg strip" with treemanifests,
and once that's done, getchunks() will be tested through tests of "hg
strip".

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH

  $ tipparents() {
  > hg parents --template "{rev}:{node|short} {desc|firstline}\n" -r tip
  > }

Test import and merge diffs

  $ hg init repo
  $ cd repo
  $ echo a > a
  $ hg ci -Am adda
  adding a
  $ echo a >> a
  $ hg ci -m changea
  $ echo c > c
  $ hg ci -Am addc
  adding c
  $ hg up 0
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo b > b
  $ hg ci -Am addb
  adding b
  created new head
  $ hg up 1
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge 3
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m merge
  $ hg export . > ../merge.diff
  $ grep -v '^merge$' ../merge.diff > ../merge.nomsg.diff
  $ cd ..
  $ hg clone -r2 repo repo2
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 2 files
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd repo2
  $ hg pull -r3 ../repo
  pulling from ../repo
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)

Test without --exact and diff.p1 == workingdir.p1

  $ hg up 1
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ cat > $TESTTMP/editor.sh <<EOF
  > env | grep HGEDITFORM
  > echo merge > \$1
  > EOF
  $ HGEDITOR="sh $TESTTMP/editor.sh" hg import --edit ../merge.nomsg.diff
  applying ../merge.nomsg.diff
  HGEDITFORM=import.normal.merge
  $ tipparents
  1:540395c44225 changea
  3:102a90ea7b4a addb
  $ hg strip --no-backup tip
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

Test without --exact and diff.p1 != workingdir.p1

  $ hg up 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg import ../merge.diff
  applying ../merge.diff
  warning: import the patch as a normal revision
  (use --exact to import the patch as a merge)
  $ tipparents
  2:890ecaa90481 addc
  $ hg strip --no-backup tip
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

Test with --exact

  $ hg import --exact ../merge.diff
  applying ../merge.diff
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ tipparents
  1:540395c44225 changea
  3:102a90ea7b4a addb
  $ hg strip --no-backup tip
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

Test with --bypass and diff.p1 == workingdir.p1

  $ hg up 1
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg import --bypass ../merge.diff
  applying ../merge.diff
  $ tipparents
  1:540395c44225 changea
  3:102a90ea7b4a addb
  $ hg strip --no-backup tip

Test with --bypass and diff.p1 != workingdir.p1

  $ hg up 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg import --bypass ../merge.diff
  applying ../merge.diff
  warning: import the patch as a normal revision
  (use --exact to import the patch as a merge)
  $ tipparents
  2:890ecaa90481 addc
  $ hg strip --no-backup tip

Test with --bypass and --exact

  $ hg import --bypass --exact ../merge.diff
  applying ../merge.diff
  $ tipparents
  1:540395c44225 changea
  3:102a90ea7b4a addb
  $ hg strip --no-backup tip

  $ cd ..

Test that --exact on a bad header doesn't corrupt the repo (issue3616)

  $ hg init repo3
  $ cd repo3
  $ echo a>a
  $ hg ci -Aqm0
  $ echo a>>a
  $ hg ci -m1
  $ echo a>>a
  $ hg ci -m2
  $ echo a>a
  $ echo b>>a
  $ echo a>>a
  $ hg ci -m3
  $ hg export 2 | head -7 > ../a.patch
  $ hg export tip > out
  >>> apatch = open("../a.patch", "ab")
  >>> apatch.write("".join(open("out").readlines()[7:]))

  $ cd ..
  $ hg clone -qr0 repo3 repo3-clone
  $ cd repo3-clone
  $ hg pull -qr1 ../repo3

  $ hg import --exact ../a.patch
  applying ../a.patch
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  patching file a
  Hunk #1 succeeded at 1 with fuzz 1 (offset -1 lines).
  transaction abort!
  rollback completed
  abort: patch is damaged or loses information
  [255]
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  1 files, 2 changesets, 2 total revisions