tests/test-rename-rev.t

localrepo: stop doing special dirstate backup at transaction open

Since the dirstate writes are already managed by the transaction, we already do
a backup of the dirstate when necessary (and even trigger one to keep `hg
rollback` happy).

We needs some special code to deal with the initial empty checkout, but it is
not too complicated.

Managing variable filename (as dirstate-v2 uses) at the "journalfile" level, is
complex and fragile (which is consistent with the fact these files are not
journal…). If we no longer do it, our life is significantly simpler.

In some sense, we apply the xkcd-1134¹ solution to our savebackup/restorebackup
problem.

[1] https://xkcd.com/1134/

(the change to test-hardlink are expect as decreasing the number of duplicated
backup drive the hardlink count down)

  $ hg init
  $ mkdir d1 d1/d11 d2
  $ echo d1/a > d1/a
  $ echo d1/ba > d1/ba
  $ echo d1/a1 > d1/d11/a1
  $ echo d1/b > d1/b
  $ echo d2/b > d2/b
  $ hg add d1/a d1/b d1/ba d1/d11/a1 d2/b
  $ hg commit -m "intial"


Test single file

# One recorded copy, one copy to record after commit
  $ hg cp d1/b d1/c
  $ cp d1/b d1/d
  $ hg add d1/d
  $ hg ci -m 'copy d1/b to d1/c and d1/d'
  $ hg st -C --change .
  A d1/c
    d1/b
  A d1/d
# Errors out without --after for now
  $ hg cp --at-rev . d1/b d1/d
  abort: --at-rev requires --after
  [10]
# Errors out with non-existent source
  $ hg cp -A --at-rev . d1/non-existent d1/d
  d1/non-existent: no such file in rev 55d1fd85ef0a
  abort: no files to copy
  [10]
# Errors out with non-existent destination
  $ hg cp -A --at-rev . d1/b d1/non-existent
  abort: d1/non-existent: copy destination does not exist in 8a9d70fa20c9
  [10]
# Successful invocation
  $ hg cp -A --at-rev . d1/b d1/d
  saved backup bundle to $TESTTMP/.hg/strip-backup/8a9d70fa20c9-973ae357-copy.hg
# New copy is recorded, and previously recorded copy is also still there
  $ hg st -C --change .
  A d1/c
    d1/b
  A d1/d
    d1/b
# Should get helpful message if we try to copy or rename after commit
  $ hg cp --forget --at-rev . d1/d
  saved backup bundle to $TESTTMP/.hg/strip-backup/3f7c325d3f9e-46f377bb-uncopy.hg
  $ hg cp d1/b d1/d
  d1/d: not overwriting - file already committed
  ('hg copy --at-rev .' to record the copy in the parent of the working copy)
  [1]
  $ hg mv d1/b d1/d
  d1/d: not overwriting - file already committed
  ('hg rename --at-rev .' to record the rename in the parent of the working copy)
  [1]

Test moved file (not copied) using 'hg cp' command

  $ hg co 0
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ mv d1/b d1/d
  $ hg rm -A d1/b
  $ hg add d1/d
  $ hg ci -m 'move d1/b to d1/d'
  created new head
  $ hg cp -A --at-rev . d1/b d1/d
  saved backup bundle to $TESTTMP/.hg/strip-backup/519850c3ea27-153c8fbb-copy.hg
  $ hg st -C --change .
  A d1/d
    d1/b
  R d1/b

Test moved file (not copied) using 'hg mv' command

  $ hg co 0
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ mv d1/b d1/d
  $ hg rm -A d1/b
  $ hg add d1/d
  $ hg ci -m 'move d1/b to d1/d'
  created new head
  $ hg mv -A --at-rev . d1/b d1/d
  saved backup bundle to $TESTTMP/.hg/strip-backup/519850c3ea27-153c8fbb-copy.hg
  $ hg st -C --change .
  A d1/d
    d1/b
  R d1/b

Test moved file (not copied) for which source still exists

  $ hg co 0
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ cp d1/b d1/d
  $ hg add d1/d
  $ hg ci -m 'copy d1/b to d1/d'
  created new head
  $ hg mv -A --at-rev . d1/b d1/d
  saved backup bundle to $TESTTMP/.hg/strip-backup/c8d0f6bcf7ca-1c9bb53e-copy.hg
  $ hg st -C --change .
  A d1/d
    d1/b

Test using directory as destination

  $ hg co 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ cp -R d1 d3
  $ hg add d3
  adding d3/a
  adding d3/b
  adding d3/ba
  adding d3/d11/a1
  $ hg ci -m 'copy d1/ to d3/'
  created new head
  $ hg cp -A --at-rev . d1 d3
  abort: d3: --at-rev does not support a directory as destination
  [10]