tests/test-add.t

checknlink: return False if .hgtmp file preexists (issue2517)

If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.

So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.

  $ hg init a
  $ cd a
  $ echo a > a
  $ hg add -n
  adding a
  $ hg st
  ? a
  $ hg add
  adding a
  $ hg st
  A a
  $ hg forget a
  $ hg add
  adding a
  $ hg st
  A a

  $ echo b > b
  $ hg add -n b
  $ hg st
  A a
  ? b
  $ hg add b
  $ hg st
  A a
  A b

should fail

  $ hg add b
  b already tracked!
  $ hg st
  A a
  A b

  $ hg ci -m 0 --traceback

should fail

  $ hg add a
  a already tracked!

  $ echo aa > a
  $ hg ci -m 1
  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo aaa > a
  $ hg ci -m 2
  created new head

  $ hg merge
  merging a
  warning: conflicts during merge.
  merging a failed!
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
  [1]
  $ hg st
  M a
  ? a.orig

should fail

  $ hg add a
  a already tracked!
  $ hg st
  M a
  ? a.orig
  $ hg resolve -m a
  $ hg ci -m merge

Issue683: peculiarity with hg revert of an removed then added file

  $ hg forget a
  $ hg add a
  $ hg st
  ? a.orig
  $ hg rm a
  $ hg st
  R a
  ? a.orig
  $ echo a > a
  $ hg add a
  $ hg st
  M a
  ? a.orig

  $ hg add c && echo "unexpected addition of missing file"
  c: No such file or directory
  [1]
  $ echo c > c
  $ hg add d c && echo "unexpected addition of missing file"
  d: No such file or directory
  [1]
  $ hg st
  M a
  A c
  ? a.orig