tests/test-rebase-legacy.t

upgraderepo: add a config option for parallel computation

The option is put to use to compute new copy tracing side data in parallel. It
use the multiprocessing module as it had the appropriate primitive for what we
needed. Gregory Szorc had concerned on windows so we disabled it there.

See inline comment for details on the parallel implementation.

#testcases continuecommand continueflag
Test rebase --continue with rebasestate written by legacy client

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > rebase=
  > drawdag=$TESTDIR/drawdag.py
  > EOF

#if continueflag
  $ cat >> $HGRCPATH <<EOF
  > [alias]
  > continue = rebase --continue
  > EOF
#endif

  $ hg init
  $ hg debugdrawdag <<'EOF'
  >    D H
  >    | |
  >    C G
  >    | |
  >    B F
  >    | |
  >  Z A E
  >   \|/
  >    R
  > EOF

rebasestate generated by a legacy client running "hg rebase -r B+D+E+G+H -d Z"

  $ touch .hg/last-message.txt
  $ cat > .hg/rebasestate <<EOF
  > 0000000000000000000000000000000000000000
  > f424eb6a8c01c4a0c0fba9f863f79b3eb5b4b69f
  > 0000000000000000000000000000000000000000
  > 0
  > 0
  > 0
  > 
  > 21a6c45028857f500f56ae84fbf40689c429305b:-2
  > de008c61a447fcfd93f808ef527d933a84048ce7:0000000000000000000000000000000000000000
  > c1e6b162678d07d0b204e5c8267d51b4e03b633c:0000000000000000000000000000000000000000
  > aeba276fcb7df8e10153a07ee728d5540693f5aa:-3
  > bd5548558fcf354d37613005737a143871bf3723:-3
  > d2fa1c02b2401b0e32867f26cce50818a4bd796a:0000000000000000000000000000000000000000
  > 6f7a236de6852570cd54649ab62b1012bb78abc8:0000000000000000000000000000000000000000
  > 6582e6951a9c48c236f746f186378e36f59f4928:0000000000000000000000000000000000000000
  > EOF

#if continuecommand
  $ hg continue --dry-run
  rebase in progress, will be resumed
#endif

  $ hg continue
  rebasing 4:c1e6b162678d "B" (B)
  rebasing 8:6f7a236de685 "D" (D)
  rebasing 2:de008c61a447 "E" (E)
  rebasing 7:d2fa1c02b240 "G" (G)
  rebasing 9:6582e6951a9c "H" (H tip)
  warning: orphaned descendants detected, not stripping c1e6b162678d, de008c61a447
  saved backup bundle to $TESTTMP/.hg/strip-backup/6f7a236de685-9880a3dc-rebase.hg

  $ hg log -G -T '{rev}:{node|short} {desc}\n'
  o  11:721b8da0a708 H
  |
  o  10:9d65695ec3c2 G
  |
  o  9:21c8397a5d68 E
  |
  | o  8:fc52970345e8 D
  | |
  | o  7:eac96551b107 B
  |/
  | o  6:bd5548558fcf C
  | |
  | | o  5:aeba276fcb7d F
  | | |
  | o |  4:c1e6b162678d B
  | | |
  o | |  3:f424eb6a8c01 Z
  | | |
  +---o  2:de008c61a447 E
  | |
  | o  1:21a6c4502885 A
  |/
  o  0:b41ce7760717 R