comparison tests/test-backout.t @ 26751:520defbc0335

hook: centralize passing HG_PENDING to external hook process

This patch centralizes passing HG_PENDING to external hook process
into '_exthook()'. To make in-memory changes visible to external hook
process, this patch does:

  - write (or schedule to write) in-memory dirstate changes, and
  - set HG_PENDING environment variable, if:
    - a transaction is running, and
    - there are in-memory changes to be visible

This patch tests some commands with some hooks, because transaction
activity of a same hook differs from each other ("---": "not tested").

    ======== ========= ========= ============
    command  preupdate precommit pretxncommit
    ======== ========= ========= ============
    unshelve   o        ---       ---
    backout    x        ---       ---
    import     ---       o         o
    qrefresh   ---       x         o
    ======== ========= ========= ============

Each hooks are examined separately to prevent in-memory changes from
being visible to external process accidentally by side effect of hooks
previously invoked.

26750:9f9ec4abe700

  $ cat a
  line 1
  line 2
  line 3

  $ cd ..

backout should not back out subsequent changesets

26751:520defbc0335

  $ cat a
  line 1
  line 2
  line 3

Test visibility of in-memory dirstate changes outside transaction to
external hook process

  $ cat > $TESTTMP/checkvisibility.sh <<EOF
  > echo "==== \$1:"
  > hg parents --template "{rev}:{node|short}\n"
  > echo "===="
  > EOF

"hg backout --merge REV1" at REV2 below implies steps below:

(1) update to REV1 (REV2 => REV1)
(2) revert by REV1^1
(3) commit backnig out revision (REV3)
(4) update to REV2 (REV3 => REV2)
(5) merge with REV3 (REV2 => REV2, REV3)

== test visibility to external preupdate hook

  $ hg update -q -C 2
  $ hg --config extensions.strip= strip 3
  saved backup bundle to * (glob)

  $ cat >> .hg/hgrc <<EOF
  > [hooks]
  > preupdate.visibility = sh $TESTTMP/checkvisibility.sh preupdate
  > EOF

("-m" is needed to avoid writing dirstte changes out at other than
invocation of the hook to be examined)

  $ hg backout --merge -d '3 0' 1 --tool=true -m 'fixed comment'
  ==== preupdate:
  2:6ea3f2a197a2
  ====
  reverting a
  created new head
  changeset 3:d92a3f57f067 backs out changeset 1:5a50a024c182
  ==== preupdate:
  3:d92a3f57f067
  ====
  merging with changeset 3:d92a3f57f067
  ==== preupdate:
  2:6ea3f2a197a2
  ====
  merging a
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ cat >> .hg/hgrc <<EOF
  > [hooks]
  > preupdate.visibility =
  > EOF

  $ cd ..

backout should not back out subsequent changesets