tests/test-import-unknown.t

largefiles: fix path handling for cp/mv (issue3516)

Previously, a copy or a move of a largefile only worked if the cwd was the root
of the repository.  The first issue was that the destination path passed to
os.mkdirs() chopped the absolute path to the standin after '.hglf/', which
essentially created a path relative to the repository root.  Similarly, the
second issue was that the source and dest paths for copyfile() were relative to
the repo root.  This converts these three paths to absolute paths.

Some notable issues, regardless of the directory in which the cp/mv is executed:

1) The copy is not being recorded in lfdirstate, but it is in dirstate for the
standins.  I'm not sure if this is by design (i.e. minimal info in lfdirstate).

2) status -C doesn't behave as expected.  Using the testcase as an example:

  # after mv + ci
  $ hg status -C -v --rev '.^'     # expected to see 'A' and ' ' lines too
  R dira\dirb\largefile

  $ hg status -C -v --rev '.^' foo/largefile
  # no output                      # expected to see 'A' and ' ' lines only

  $ hg status -C -v --rev '.^' foo/
  # no output                      # expected to see 'A', ' ' and 'R' lines

  $ hg status -C -v --rev '.^' ./  # expected to see 'A' and ' ' lines too
  R dirb\largefile

  $ hg status -C -v --rev '.^' ../.hglf/dira/foo/largefile
  A ..\.hglf\dira\foo\largefile
    ..\.hglf\dira\dirb\largefile  # no 'R' expected when new file is specified

  $ hg status -C -v --rev '.^' ../.hglf   # OK
  A ..\.hglf\dira\foo\largefile
    ..\.hglf\dira\dirb\largefile
  R ..\.hglf\dira\dirb\largefile

  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > purge =
  > EOF

  $ hg init test
  $ cd test
  $ echo a > changed
  $ echo a > removed
  $ echo a > source
  $ hg ci -Am addfiles
  adding changed
  adding removed
  adding source
  $ echo a >> changed
  $ echo a > added
  $ hg add added
  $ hg rm removed
  $ hg cp source copied
  $ hg diff --git > ../unknown.diff

Test adding on top of an unknown file

  $ hg up -qC 0
  $ hg purge
  $ echo a > added
  $ hg import --no-commit ../unknown.diff
  applying ../unknown.diff
  file added already exists
  1 out of 1 hunks FAILED -- saving rejects to file added.rej
  abort: patch failed to apply
  [255]

Test modifying an unknown file

  $ hg revert -aq
  $ hg purge
  $ hg rm changed
  $ hg ci -m removechanged
  $ echo a > changed
  $ hg import --no-commit ../unknown.diff
  applying ../unknown.diff
  abort: cannot patch changed: file is not tracked
  [255]

Test removing an unknown file

  $ hg up -qC 0
  $ hg purge
  $ hg rm removed
  $ hg ci -m removeremoved
  created new head
  $ echo a > removed
  $ hg import --no-commit ../unknown.diff
  applying ../unknown.diff
  abort: cannot patch removed: file is not tracked
  [255]

Test copying onto an unknown file

  $ hg up -qC 0
  $ hg purge
  $ echo a > copied
  $ hg import --no-commit ../unknown.diff
  applying ../unknown.diff
  abort: cannot create copied: destination already exists
  [255]

  $ cd ..