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 rename(orig, src, dest, *args, **kwargs):

  >         path = util.normpath(dest)

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

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

  >         return orig(src, dest, *args, **kwargs)

  >     extensions.wrapfunction(util, 'rename', rename)

  > 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)

  > def extsetup(ui):

  >     def rename(orig, src, dest, *args, **kwargs):

  >         path = util.normpath(dest)

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

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

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

  >         return r

  >     extensions.wrapfunction(util, 'rename', rename)

  > EOF

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

  > import os

  > import signal

  > 

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

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

  > EOF

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

  > import os

  > import signal

  > from mercurial import extensions, revlog, testing

  > def _wait_post_load(orig, self, *args, **kwargs):

  >     wait = b'data/file' in self.radix

  >     if wait:

  >         testing.wait_file(b"$TESTTMP/writer-revlog-split")

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

  >     if wait:

  >         testing.write_file(b"$TESTTMP/reader-index-read")

  >         testing.wait_file(b"$TESTTMP/writer-revlog-unsplit")

  >     return r

  > 

  > def extsetup(ui):

  >     extensions.wrapfunction(revlog.revlog, '_loadindex', _wait_post_load)

  > EOF

setup a repository for tests

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

  $ cat >> $HGRCPATH << EOF

  > [format]

  > revlog-compression=none

  > EOF

  $ hg init troffset-computation

  $ cd troffset-computation

  $ files="

  > file

  > Directory_With,Special%Char/Complex_File.babar

  > foo/bar/babar_celeste/foo

  > "

  $ for f in $files; do

  >     mkdir -p `dirname $f`

  > done

  $ for f in $files; do

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

  > done

  $ hg commit -Aqma

  $ for f in $files; do

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

  > done

  $ hg commit -Aqmb

  $ for f in $files; do

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

  > done

  $ hg commit -Aqmc

  $ for f in $files; do

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

  > done

  $ hg commit -AqmD --traceback

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* (glob)

  [137]

#endif

The inline revlog still exist, but a split version exist next to it

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

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

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

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

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

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

A "temporary file" entry exist for the split index.

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

  data/file.i 1174

  data/file.d 0

  $ cat .hg/store/journal.backupfiles | tr -s '\000' ' ' | tr -s '\00' ' '| grep data/file

   data/file.i data/journal.backup.file.i 0

   data/file.i.s 0

recover is rolling the split back, the fncache is still valid

  $ 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.i: size=1174

  $ hg tip

  tag:         tip

  user:        test

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

  summary:     b

  $ hg verify -q

  $ hg debugrebuildfncache --only-data

  fncache already up to date

  $ 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

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  *Killed* (glob)

  [137]

#endif

The inline revlog still exist, but a split version exist next to it

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

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

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

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

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

  data/file.i 1174

  data/file.d 0

recover is rolling the split back, the fncache is still valid

  $ 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.i: size=1174

  $ hg tip

  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.

  $ 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

  > EOF

#if chg

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  [255]

#else

  $ hg pull ../troffset-computation

  pulling from ../troffset-computation

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  *Killed* (glob)

  [137]

#endif

The inline revlog was over written 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

recover is rolling the split back, the fncache is still valid

  $ 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.i: size=1174

  $ hg tip

  tag:         tip

  user:        test

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

  summary:     b

  $ hg verify -q

  $ 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]

The split was rollback

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

  .hg/store/data/file.d: size=0