tests/test-casecollision-merge.t

filectx: fix cmp() of file starting with '\1\n'

If file data starts with '\1\n', it will be escaped in the revlog to
create an empty metadata block, thus adding four bytes to the size in
the revlog size index. There's no way to detect that this has happened
in filelog.size() faster than decompressing each revision [1].

For filectx.cmp(), we have the size of the file in the working directory
available. If it differs by exactly four bytes, it may be this case, so
do a full comparison.

 [1]: http://markmail.org/message/5akdbmmqx7vq2fsg

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