annotate tests/test-issue6528.t @ 47052:411dc27fd9fd stable 5.8.1

corruption: backout changeset 49fd21f32695 (issue6528)

inverting the parent is masking copy information leading to bad content being
fetched and bad status result.

Since 49fd21f32695, exchange can actively swap these parent corrupting existing
changesets and triggering the corruption.

Data corruption are considered critical so backing this out and doing and
unscheduled release seems in order.

Differential Revision: https://phab.mercurial-scm.org/D10995

===============================================================
Test non-regression on the corruption associated with issue6528
===============================================================

Setup
-----

  $ hg init base-repo
  $ cd base-repo

  $ cat <<EOF > a.txt
  > 1
  > 2
  > 3
  > 4
  > 5
  > 6
  > EOF

  $ hg add a.txt
  $ hg commit -m 'c_base_c - create a.txt'

Modify a.txt

  $ sed -e 's/1/foo/' a.txt > a.tmp; mv a.tmp a.txt
  $ hg commit -m 'c_modify_c - modify a.txt'

Modify and rename a.txt to b.txt

  $ hg up -r "desc('c_base_c')"
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ sed -e 's/6/bar/' a.txt > a.tmp; mv a.tmp a.txt
  $ hg mv a.txt b.txt
  $ hg commit -m 'c_rename_c - rename and modify a.txt to b.txt'
  created new head

Merge each branch

  $ hg merge -r "desc('c_modify_c')"
  merging b.txt and a.txt to b.txt
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg commit -m 'c_merge_c: commit merge'

  $ hg debugrevlogindex b.txt
     rev linkrev nodeid       p1           p2
       0       2 05b806ebe5ea 000000000000 000000000000
       1       3 a58b36ad6b65 000000000000 05b806ebe5ea

Check commit Graph

  $ hg log -G
  @    changeset:   3:a1cc2bdca0aa
  |\   tag:         tip
  | |  parent:      2:615c6ccefd15
  | |  parent:      1:373d507f4667
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     c_merge_c: commit merge
  | |
  | o  changeset:   2:615c6ccefd15
  | |  parent:      0:f5a5a568022f
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     c_rename_c - rename and modify a.txt to b.txt
  | |
  o |  changeset:   1:373d507f4667
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     c_modify_c - modify a.txt
  |
  o  changeset:   0:f5a5a568022f
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     c_base_c - create a.txt
  

  $ hg cat -r . b.txt
  foo
  2
  3
  4
  5
  bar
  $ cat b.txt
  foo
  2
  3
  4
  5
  bar
  $ cd ..


Check the lack of corruption
----------------------------

  $ hg clone --pull base-repo cloned
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 4 changes to 2 files
  new changesets f5a5a568022f:a1cc2bdca0aa
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd cloned
  $ hg up -r "desc('c_merge_c')"
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved


Status is buggy, even with debugrebuilddirstate

  $ hg cat -r . b.txt
  foo
  2
  3
  4
  5
  bar
  $ cat b.txt
  foo
  2
  3
  4
  5
  bar
  $ hg status
  $ hg debugrebuilddirstate
  $ hg status

the history was altered

in theory p1/p2 order does not matter but in practice p1 == nullid is used as a
marker that some metadata are present and should be fetched.

  $ hg debugrevlogindex b.txt
     rev linkrev nodeid       p1           p2
       0       2 05b806ebe5ea 000000000000 000000000000
       1       3 a58b36ad6b65 000000000000 05b806ebe5ea

Check commit Graph

  $ hg log -G
  @    changeset:   3:a1cc2bdca0aa
  |\   tag:         tip
  | |  parent:      2:615c6ccefd15
  | |  parent:      1:373d507f4667
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     c_merge_c: commit merge
  | |
  | o  changeset:   2:615c6ccefd15
  | |  parent:      0:f5a5a568022f
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     c_rename_c - rename and modify a.txt to b.txt
  | |
  o |  changeset:   1:373d507f4667
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     c_modify_c - modify a.txt
  |
  o  changeset:   0:f5a5a568022f
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     c_base_c - create a.txt