tests/test-casecollision-merge.t

copies: eliminate criss-crosses when chaining

Before the copies refactoring, we declared that if a and b were
present in source and destination, we ignored copies between them. The
refactored code could however report b was a copy of a and vice versa
in a situation where we looked for differences between two identical
changesets that copy a to b.

  y
 /
x
 \
  y'

run only on case-insensitive filesystems

  $ "$TESTDIR/hghave" icasefs || exit 80

################################
test for branch merging
################################

  $ hg init repo1
  $ cd repo1

create base revision

  $ echo base > base.txt
  $ hg add base.txt
  $ hg commit -m 'base'

add same file in different case on both heads

  $ echo a > a.txt
  $ hg add a.txt
  $ hg commit -m 'add a.txt'

  $ hg update 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo A > A.TXT
  $ hg add A.TXT
  $ hg commit -m 'add A.TXT'
  created new head

merge another, and fail with case-folding collision

  $ hg merge
  abort: case-folding collision between a.txt and A.TXT
  [255]

check clean-ness of working directory

  $ hg status
  $ hg parents --template '{rev}\n'
  2
  $ cd ..

################################
test for linear updates
################################

  $ hg init repo2
  $ cd repo2

create base revision (rev:0)

  $ hg import --bypass --exact - <<EOF
  > # HG changeset patch
  > # User null
  > # Date 1 0
  > # Node ID e1bdf414b0ea9c831fd3a14e94a0a18e1410f98b
  > # Parent  0000000000000000000000000000000000000000
  > add a
  > 
  > diff --git a/a b/a
  > new file mode 100644
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,3 @@
  > +this is line 1
  > +this is line 2
  > +this is line 3
  > EOF
  applying patch from stdin

create rename revision (rev:1)

  $ hg import --bypass --exact - <<EOF
  > # HG changeset patch
  > # User null
  > # Date 1 0
  > # Node ID 9dca9f19bb91851bc693544b598b0740629edfad
  > # Parent  e1bdf414b0ea9c831fd3a14e94a0a18e1410f98b
  > rename a to A
  > 
  > diff --git a/a b/A
  > rename from a
  > rename to A
  > EOF
  applying patch from stdin

update to base revision, and modify 'a'

  $ hg update 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo 'this is added line' >> a

update to current tip linearly

  $ hg update 1
  merging a and A to A
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved

check status and contents of file

  $ hg status -A
  M A
  $ cat A
  this is line 1
  this is line 2
  this is line 3
  this is added line