Test correctness of revlog inline -> non-inline transition

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

Helper extension to intercept renames and kill process

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

  > import os

  > import signal

  > 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.kill(os.getpid(), signal.SIGKILL)

  >         return orig(*args, **kwargs)

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

  > EOF

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

  > import os

  > import signal

  > from mercurial import extensions, util

  > 

  > def extsetup(ui):

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

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

  >         r = orig(*args, **kwargs)

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

  >             os.kill(os.getpid(), signal.SIGKILL)

  >         return r

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

  > EOF

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

  > import os

  > import signal

  > 

  > def killme(ui, repo, hooktype, **kwargs):

  >     os.kill(os.getpid(), signal.SIGKILL)

  > EOF

setup a repository for tests

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

  $ cat >> $HGRCPATH << EOF

  > [format]

  > revlog-compression=none

  > EOF

  $ hg init troffset-computation

  $ 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

Reference size:

  $ f -s file

  file: size=131072

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

  .hg/store/data/file.d: size=132139

  .hg/store/data/file.i: size=256

  $ cd ..

Test a hard crash after the file was split but before the transaction was committed

===================================================================================

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 clone --quiet --rev 1 troffset-computation troffset-computation-copy

  $ cd troffset-computation-copy

Reference size:

  $ f -s file

  file: size=1024

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

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

  $ cat > .hg/hgrc <<EOF

  > [hooks]

  > pretxnchangegroup = python:$TESTTMP/killme.py:killme

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  Killed

  [137]

#endif

The revlog have been split on disk

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

  .hg/store/data/file.d: size=132139

  .hg/store/data/file.i: size=256

  $ 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 ..

Test a hard crash right before the index is move into place

===========================================================

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 --quiet --rev 1 troffset-computation troffset-computation-copy2

  $ cd troffset-computation-copy2

Reference size:

  $ f -s file

  file: size=1024

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

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

  $ cat > .hg/hgrc <<EOF

  > [extensions]

  > intercept_rename = $TESTTMP/intercept_before_rename.py

  > [hooks]

  > pretxnchangegroup = python:$TESTTMP/killme.py:killme

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  Killed

  [137]

#endif

The data file is created, but the revlog is still inline

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

  .hg/store/data/file.d: size=132139

  .hg/store/data/file.i: size=132395

  $ 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 ..

Test a hard crash right after the index is move into place

===========================================================

Now retry the procedure but intercept the rename of the index.

Things get corrupted /o\

  $ hg clone --quiet --rev 1 troffset-computation troffset-computation-crash-after-rename

  $ cd troffset-computation-crash-after-rename

Reference size:

  $ f -s file

  file: size=1024

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

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

  $ cat > .hg/hgrc <<EOF

  > [extensions]

  > intercept_rename = $TESTTMP/intercept_after_rename.py

  > [hooks]

  > pretxnchangegroup = python:$TESTTMP/killme.py:killme

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  Killed

  [137]

#endif

the revlog has been split on disk

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

  .hg/store/data/file.d: size=132139

  .hg/store/data/file.i: size=256

  $ 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

  abort: attempted to truncate data/file.i to 1174 bytes, but it was already 256 bytes

  [255]

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

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

  .hg/store/data/file.i: size=256

  $ hg tip

  changeset:   1:cfa8d6e60429

  tag:         tip

  user:        test

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

  summary:     b

  $ hg verify -q

  abandoned transaction found - run hg recover

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

   file@0: data length off by -131093 bytes

   file@2: unpacking fa1120531cc1: partial read of revlog data/file.d; expected 21 bytes from offset 1046, got 0

   file@3: unpacking a631378adaa3: partial read of revlog data/file.d; expected 131072 bytes from offset 1067, got -21

   file@?: rev 2 points to nonexistent changeset 2

   (expected )

   file@?: fa1120531cc1 not in manifests

   file@?: rev 3 points to nonexistent changeset 3

   (expected )

   file@?: a631378adaa3 not in manifests

  not checking dirstate because of previous errors

  3 warnings encountered!

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

  7 integrity errors encountered!

  (first damaged changeset appears to be 0)

  [1]

  $ cd ..

Have the transaction rollback itself without any hard crash

===========================================================

Repeat the original test but let hg rollback the transaction.

  $ hg clone --quiet --rev 1 troffset-computation troffset-computation-copy-rb

  $ 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]

File are still split on disk, with the expected size.

  $ 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 ..