view tests/test-rebase-dry-run.t @ 51181:dcaa2df1f688

changelog: never inline changelog

The test suite mostly use small repositories, that implies that most changelog in the
tests are inlined. As a result, non-inlined changelog are quite poorly tested.
Since non-inline changelog are most common case for serious repositories, this
lack of testing is a significant problem that results in high profile issue like
the one recently fixed by 66417f55ea33 and 849745d7da89.

Inlining the changelog does not bring much to the table, the number of total
file saved is negligible, and the changelog will be read by most operation
anyway.

So this changeset is make it so we never inline the changelog, and de-inline the
one that are still inlined whenever we touch them.

By doing that, we remove the "dual code path" situation for writing new entry to
the changelog and move to a "single code path" situation. Having a single
code path simplify the code and make sure it is covered by test (if test cover
that situation obviously)


This impact all tests that care about the number of file and the exchange size,
but there is nothing too complicated in them just a lot of churn.

The churn is made "worse" by the fact rust will use the persistent nodemap on
any changelog now. Which is overall a win as it means testing the persistent
nodemap more and having less special cases.

In short, having inline changelog is mostly useless and an endless source of
pain. We get rid of it.

======================
rebase --dry-run tests
======================

Test behavior associated with `hg rebase --dry-run`

Setup
=====

  $ hg init r1
  $ cd r1
  $ echo one > f01.txt
  $ echo two > f02.txt
  $ echo three > f03.txt
  $ hg add
  adding f01.txt
  adding f02.txt
  adding f03.txt
  $ hg ci -m 'ci-1' f01.txt f02.txt f03.txt
  $ hg book base; hg book -i
  $ echo add-to-one >> f01.txt
  $ hg ci -m 'br-1' f01.txt
  $ hg book branch-1; hg book -i
  $ hg up base; hg book -i
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark base)
  $ echo add-to-two >> f02.txt
  $ hg ci -m 'br-2' f02.txt
  created new head
  $ hg book branch-2; hg book -i
  $ hg up branch-1; hg book -i
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark branch-1)
  $ hg log -G
  o  changeset:   2:d408211b0a6f
  |  bookmark:    branch-2
  |  tag:         tip
  |  parent:      0:99418d161ee0
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     br-2
  |
  | @  changeset:   1:ab62441498e5
  |/   bookmark:    branch-1
  |    user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     br-1
  |
  o  changeset:   0:99418d161ee0
     bookmark:    base
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     ci-1
  


Check the working copy changes do not get wiped out
===================================================

  $ echo add-to-three >> f03.txt

f03 is modified

  $ hg st
  M f03.txt
  $ hg diff
  diff -r ab62441498e5 f03.txt
  --- a/f03.txt	Thu Jan 01 00:00:00 1970 +0000
  +++ b/f03.txt	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,2 @@
   three
  +add-to-three


  $ hg rebase -v -n -s branch-2 -d branch-1 --config extensions.rebase=
  starting dry-run rebase; repository will not be changed
  rebasing 2:d408211b0a6f branch-2 tip "br-2"
  resolving manifests
  getting f02.txt
  committing files:
  f02.txt
  committing manifest
  committing changelog
  rebase merging completed
  dry-run rebase completed successfully; run without -n/--dry-run to perform this rebase

f03 changes are lost

  $ hg st
  M f03.txt
  $ hg diff
  diff -r ab62441498e5 f03.txt
  --- a/f03.txt	Thu Jan 01 00:00:00 1970 +0000
  +++ b/f03.txt	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,2 @@
   three
  +add-to-three