Test correctness of revlog inline -> non-inline transition

----------------------------------------------------------

Helper extension to intercept renames.

  $ cat > $TESTTMP/intercept_rename.py << EOF

  > import os

  > import sys

  > from mercurial import extensions, util

  > 

  > def extsetup(ui):

  >     def close(orig, *args, **kwargs):

  >         path = util.normpath(args[0]._atomictempfile__name)

  >         if path.endswith(b'/.hg/store/data/file.i'):

  >             os._exit(80)

  >         return orig(*args, **kwargs)

  >     extensions.wrapfunction(util.atomictempfile, 'close', close)

  > EOF

Test offset computation to correctly factor in the index entries themselves.

Also test that the new data size has the correct size if the transaction is aborted

after the index has been replaced.

Test repo has commits a, b, c, D, where D is large (grows the revlog enough that it

transitions to non-inline storage). The clone initially has changes a, b

and will transition to non-inline storage when adding c, D.

If the transaction adding c, D is rolled back, then we don't undo the revlog split,

but truncate the index and the data to remove both c and D.

  $ hg init troffset-computation --config format.revlog-compression=none

  $ cd troffset-computation

  $ printf '%20d' '1' > file

  $ hg commit -Aqma

  $ printf '%1024d' '1' > file

  $ hg commit -Aqmb

  $ printf '%20d' '1' > file

  $ hg commit -Aqmc

  $ dd if=/dev/zero of=file bs=1k count=128 > /dev/null 2>&1

  $ hg commit -AqmD

  $ cd ..

  $ hg clone -r 1 troffset-computation troffset-computation-copy --config format.revlog-compression=none -q

  $ cd troffset-computation-copy

Reference size:

  $ f -s .hg/store/data/file*

  .hg/store/data/file.i: size=1174

  $ cat > .hg/hgrc <<EOF

  > [hooks]

  > pretxnchangegroup = python:$TESTDIR/helper-killhook.py:killme

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [80]

#endif

  $ cat .hg/store/journal | tr -s '\000' ' ' | grep data/file | tail -1

  data/file.i 128

The first file.i entry should match the "Reference size" above.

The first file.d entry is the temporary record during the split,

the second entry after the split happened. The sum of the second file.d

and the second file.i entry should match the first file.i entry.

  $ cat .hg/store/journal | tr -s '\000' ' ' | grep data/file

  data/file.i 1174

  data/file.d 0

  data/file.d 1046

  data/file.i 128

  $ hg recover

  rolling back interrupted transaction

  (verify step skipped, run `hg verify` to check your repository content)

  $ f -s .hg/store/data/file*

  .hg/store/data/file.d: size=1046

  .hg/store/data/file.i: size=128

  $ hg tip

  changeset:   1:cfa8d6e60429

  tag:         tip

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     b

  $ hg verify -q

   warning: revlog 'data/file.d' not in fncache!

  1 warnings encountered!

  hint: run "hg debugrebuildfncache" to recover from corrupt fncache

  $ hg debugrebuildfncache --only-data

  adding data/file.d

  1 items added, 0 removed from fncache

  $ hg verify -q

  $ cd ..

Now retry the procedure but intercept the rename of the index and check that

the journal does not contain the new index size. This demonstrates the edge case

where the data file is left as garbage.

  $ hg clone -r 1 troffset-computation troffset-computation-copy2 --config format.revlog-compression=none -q

  $ cd troffset-computation-copy2

  $ cat > .hg/hgrc <<EOF

  > [extensions]

  > intercept_rename = $TESTTMP/intercept_rename.py

  > [hooks]

  > pretxnchangegroup = python:$TESTDIR/helper-killhook.py:killme

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [80]

#endif

  $ cat .hg/store/journal | tr -s '\000' ' ' | grep data/file

  data/file.i 1174

  data/file.d 0

  data/file.d 1046

  $ hg recover

  rolling back interrupted transaction

  (verify step skipped, run `hg verify` to check your repository content)

  $ f -s .hg/store/data/file*

  .hg/store/data/file.d: size=1046

  .hg/store/data/file.i: size=1174

  $ hg tip

  changeset:   1:cfa8d6e60429

  tag:         tip

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     b

  $ hg verify -q

  $ cd ..

Repeat the original test but let hg rollback the transaction.

  $ hg clone -r 1 troffset-computation troffset-computation-copy-rb --config format.revlog-compression=none -q

  $ cd troffset-computation-copy-rb

  $ cat > .hg/hgrc <<EOF

  > [hooks]

  > pretxnchangegroup = false

  > EOF

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  transaction abort!

  rollback completed

  abort: pretxnchangegroup hook exited with status 1

  [40]

  $ f -s .hg/store/data/file*

  .hg/store/data/file.d: size=1046

  .hg/store/data/file.i: size=128

  $ hg tip

  changeset:   1:cfa8d6e60429

  tag:         tip

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     b

  $ hg verify -q

   warning: revlog 'data/file.d' not in fncache!

  1 warnings encountered!

  hint: run "hg debugrebuildfncache" to recover from corrupt fncache

  $ cd ..