tests/test-censor.t

interfaces: add the optional `bdiff.xdiffblocks()` method

PyCharm flagged where this was called on the protocol class in `mdiff.py` in the
previous commit, but pytype completely missed it.  PyCharm is correct here, but
I'm committing this separately to highlight this potential problem- some of the
implementations don't implement _all_ of the methods the others do, and there's
not a great way to indicate on a protocol class that a method or attribute is
optional- that's kinda the opposite of what static typing is about.

Making the method an `Optional[Callable]` attribute works here, and keeps both
PyCharm and pytype happy, and the generated `mdiff.pyi` and `modules.pyi` look
reasonable.  We might be getting a little lucky, because the method isn't
invoked directly- it is returned from another method that selects which block
function to use.  Except since it is declared on the protocol class, every
module needs this attribute (in theory, but in practice this doesn't seem to be
checked), so the check for it on the module has to change from `hasattr()` to
`getattr(..., None)`.  We defer defining the optional attrs to the type checking
phase as an extra precaution- that way it isn't an attr with a `None` value at
runtime if someone is still using `hasattr()`.

As to why pytype missed this, I have no clue.  The generated `mdiff.pyi` even
has the global variable typed as `bdiff: intmod.BDiff`, so uses of it really
should comply with what is on the class, protocol class or not.

#require no-reposimplestore
#testcases revlogv1 revlogv2

#if revlogv2

  $ cat >> $HGRCPATH <<EOF
  > [experimental]
  > revlogv2=enable-unstable-format-and-corrupt-my-data
  > EOF

#endif

  $ cp $HGRCPATH $HGRCPATH.orig

Create repo with unimpeachable content

  $ hg init r
  $ cd r
  $ echo 'Initially untainted file' > target
  $ echo 'Normal file here' > bystander
  $ hg add target bystander
  $ hg ci -m init

Clone repo so we can test pull later

  $ cd ..
  $ hg clone r rpull
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd r

Introduce content which will ultimately require censorship. Name the first
censored node C1, second C2, and so on

  $ echo 'Tainted file' > target
  $ echo 'Passwords: hunter2' >> target
  $ hg ci -m taint target
  $ C1=`hg id --debug -i`

  $ echo 'hunter3' >> target
  $ echo 'Normal file v2' > bystander
  $ hg ci -m moretaint target bystander
  $ C2=`hg id --debug -i`

Add a new sanitized versions to correct our mistake. Name the first head H1,
the second head H2, and so on

  $ echo 'Tainted file is now sanitized' > target
  $ hg ci -m sanitized target
  $ H1=`hg id --debug -i`

  $ hg update -r $C2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo 'Tainted file now super sanitized' > target
  $ hg ci -m 'super sanitized' target
  created new head
  $ H2=`hg id --debug -i`

Verify target contents before censorship at each revision

  $ hg cat -r $H1 target | head -n 10
  Tainted file is now sanitized
  $ hg cat -r $H2 target | head -n 10
  Tainted file now super sanitized
  $ hg cat -r $C2 target | head -n 10
  Tainted file
  Passwords: hunter2
  hunter3
  $ hg cat -r $C1 target | head -n 10
  Tainted file
  Passwords: hunter2
  $ hg cat -r 0 target | head -n 10
  Initially untainted file

Censor revision with 2 offenses

(this also tests file pattern matching: path relative to cwd case)

  $ mkdir -p foo/bar/baz
  $ hg --config extensions.censor= --cwd foo/bar/baz censor -r $C2 -t "remove password" ../../../target
  checking for the censored content in 2 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg cat -r $H1 target | head -n 10
  Tainted file is now sanitized
  $ hg cat -r $H2 target | head -n 10
  Tainted file now super sanitized
  $ hg cat -r $C2 target | head -n 10
  abort: censored node: 1e0247a9a4b7
  (set censor.policy to ignore errors)
  $ hg cat -r $C1 target | head -n 10
  Tainted file
  Passwords: hunter2
  $ hg cat -r 0 target | head -n 10
  Initially untainted file

Censor revision with 1 offense

(this also tests file pattern matching: with 'path:' scheme)

  $ hg --config extensions.censor= --cwd foo/bar/baz censor -r $C1 path:target
  checking for the censored content in 2 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg cat -r $H1 target | head -n 10
  Tainted file is now sanitized
  $ hg cat -r $H2 target | head -n 10
  Tainted file now super sanitized
  $ hg cat -r $C2 target | head -n 10
  abort: censored node: 1e0247a9a4b7
  (set censor.policy to ignore errors)
  $ hg cat -r $C1 target | head -n 10
  abort: censored node: 613bc869fceb
  (set censor.policy to ignore errors)
  $ hg cat -r 0 target | head -n 10
  Initially untainted file

Can only checkout target at uncensored revisions, -X is workaround for --all

  $ hg revert -r $C2 target | head -n 10
  abort: censored node: 1e0247a9a4b7
  (set censor.policy to ignore errors)
  $ hg revert -r $C1 target | head -n 10
  abort: censored node: 613bc869fceb
  (set censor.policy to ignore errors)
  $ hg revert -r $C1 --all
  reverting bystander
  reverting target
  abort: censored node: 613bc869fceb
  (set censor.policy to ignore errors)
  [255]
  $ hg revert -r $C1 --all -X target
  $ cat target | head -n 10
  Tainted file now super sanitized
  $ hg revert -r 0 --all
  reverting target
  $ cat target | head -n 10
  Initially untainted file
  $ hg revert -r $H2 --all
  reverting bystander
  reverting target
  $ cat target | head -n 10
  Tainted file now super sanitized

Uncensored file can be viewed at any revision

  $ hg cat -r $H1 bystander | head -n 10
  Normal file v2
  $ hg cat -r $C2 bystander | head -n 10
  Normal file v2
  $ hg cat -r $C1 bystander | head -n 10
  Normal file here
  $ hg cat -r 0 bystander | head -n 10
  Normal file here

Can update to children of censored revision

  $ hg update -r $H1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Tainted file is now sanitized
  $ hg update -r $H2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Tainted file now super sanitized

Set censor policy to abort in trusted $HGRC so hg verify fails

  $ cp $HGRCPATH.orig $HGRCPATH
  $ cat >> $HGRCPATH <<EOF
  > [censor]
  > policy = abort
  > EOF

Repo fails verification due to censorship

  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
   target@1: censored file data
   target@2: censored file data
  not checking dirstate because of previous errors
  checked 5 changesets with 7 changes to 2 files
  2 integrity errors encountered!
  (first damaged changeset appears to be 1)
  [1]

Cannot update to revision with censored data

  $ hg update -r $C2
  abort: censored node: 1e0247a9a4b7
  (set censor.policy to ignore errors)
  [255]
  $ hg update -r $C1
  abort: censored node: 613bc869fceb
  (set censor.policy to ignore errors)
  [255]
  $ hg update -r 0
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg update -r $H2
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

Set censor policy to ignore in trusted $HGRC so hg verify passes

  $ cp $HGRCPATH.orig $HGRCPATH
  $ cat >> $HGRCPATH <<EOF
  > [censor]
  > policy = ignore
  > EOF

Repo passes verification with warnings with explicit config

  $ hg verify -q

May update to revision with censored data with explicit config

  $ hg update -r $C2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  $ hg update -r $C1
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  $ hg update -r 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Initially untainted file
  $ hg update -r $H2
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Tainted file now super sanitized

Can merge in revision with censored data. Test requires one branch of history
with the file censored, but we can't censor at a head, so advance H1.

  $ hg update -r $H1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ C3=$H1
  $ echo 'advanced head H1' > target
  $ hg ci -m 'advance head H1' target
  $ H1=`hg id --debug -i`
  $ hg --config extensions.censor= censor -r $C3 target
  checking for the censored content in 2 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg update -r $H2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg merge -r $C3
  merging target
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

Revisions present in repository heads may not be censored

  $ hg update -C -r $H2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --config extensions.censor= censor -r $H2 target
  checking for the censored content in 2 heads
  abort: cannot censor file in heads (78a8fc215e79)
  (clean/delete and commit first)
  [255]
  $ echo 'twiddling thumbs' > bystander
  $ hg ci -m 'bystander commit'
  $ H2=`hg id --debug -i`
  $ hg --config extensions.censor= censor -r "$H2^" target
  checking for the censored content in 2 heads
  abort: cannot censor file in heads (efbe78065929)
  (clean/delete and commit first)
  [255]

Cannot censor working directory

  $ echo 'seriously no passwords' > target
  $ hg ci -m 'extend second head arbitrarily' target
  $ H2=`hg id --debug -i`
  $ hg update -r "$H2^"
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --config extensions.censor= censor -r . target
  checking for the censored content in 2 heads
  checking for the censored content in the working directory
  abort: cannot censor working directory
  (clean/delete/update first)
  [255]
  $ hg update -r $H2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

Can re-add file after being deleted + censored

  $ C4=$H2
  $ hg rm target
  $ hg ci -m 'delete target so it may be censored'
  $ H2=`hg id --debug -i`
  $ hg --config extensions.censor= censor -r $C4 target
  checking for the censored content in 2 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg cat -r $C4 target | head -n 10
  $ hg cat -r "$H2^^" target | head -n 10
  Tainted file now super sanitized
  $ echo 'fresh start' > target
  $ hg add target
  $ hg ci -m reincarnated target
  $ H2=`hg id --debug -i`
  $ hg cat -r $H2 target | head -n 10
  fresh start
  $ hg cat -r "$H2^" target | head -n 10
  target: no such file in rev 452ec1762369
  $ hg cat -r $C4 target | head -n 10
  $ hg cat -r "$H2^^^" target | head -n 10
  Tainted file now super sanitized

Can censor enough revision to move back to inline storage

  $ hg debugrevlogstats | grep target
  rev-count   data-size inl type      target 
          8         ??? no  file      target (glob) (revlogv2 !)
          8         ??? yes file      target (glob) (revlogv1 !)
  $ $TESTDIR/seq.py 4000 | $TESTDIR/sha256line.py > target
  $ hg ci -m 'add 100k passwords'
  $ H2=`hg id --debug -i`
  $ C5=$H2
  $ hg revert -r "$H2^" target
  $ hg ci -m 'cleaned 100k passwords'
  $ H2=`hg id --debug -i`
  $ hg debugrevlogstats | grep target
  rev-count   data-size inl type      target 
         10      ?????? no  file      target (glob)
  $ hg --config extensions.censor= censor -r $C5 target
  checking for the censored content in 2 heads
  checking for the censored content in the working directory
  censoring 1 file revisions

The important part is for the censor operation to not crash and the repository
to not be corrupted.  Right now this involve keeping the revlog split.

  $ hg debugrevlogstats | grep target
  rev-count   data-size inl type      target 
         10         ??? no  file      target (glob)
  $ hg cat -r $C5 target | head -n 10
  $ hg cat -r $H2 target | head -n 10
  fresh start
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checking dirstate
  checked 12 changesets with 13 changes to 2 files

Repo with censored nodes can be cloned and cloned nodes are censored

  $ cd ..
  $ hg clone r rclone
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd rclone
  $ hg cat -r $H1 target | head -n 10
  advanced head H1
  $ hg cat -r $H2~5 target | head -n 10
  Tainted file now super sanitized
  $ hg cat -r $C2 target | head -n 10
  $ hg cat -r $C1 target | head -n 10
  $ hg cat -r 0 target | head -n 10
  Initially untainted file
  $ hg verify -q

Repo cloned before tainted content introduced can pull censored nodes

  $ cd ../rpull
  $ hg cat -r tip target | head -n 10
  Initially untainted file
  $ hg verify -q
  $ hg pull -r $H1 -r $H2
  pulling from $TESTTMP/r
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 11 changesets with 11 changes to 2 files (+1 heads)
  new changesets * (glob)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg update 4
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Tainted file now super sanitized
  $ hg cat -r $H1 target | head -n 10
  advanced head H1
  $ hg cat -r $H2~5 target | head -n 10
  Tainted file now super sanitized
  $ hg cat -r $C2 target | head -n 10
  $ hg cat -r $C1 target | head -n 10
  $ hg cat -r 0 target | head -n 10
  Initially untainted file
  $ hg verify -q

Censored nodes can be pushed if they censor previously unexchanged nodes

  $ echo 'Passwords: hunter2hunter2' > target
  $ hg ci -m 're-add password from clone' target
  created new head
  $ H3=`hg id --debug -i`
  $ REV=$H3
  $ echo 'Re-sanitized; nothing to see here' > target
  $ hg ci -m 're-sanitized' target
  $ H2=`hg id --debug -i`
  $ CLEANREV=$H2
  $ hg cat -r $REV target | head -n 10
  Passwords: hunter2hunter2
  $ hg --config extensions.censor= censor -r $REV target
  checking for the censored content in 3 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg cat -r $REV target | head -n 10
  $ hg cat -r $CLEANREV target | head -n 10
  Re-sanitized; nothing to see here
  $ hg push -f -r $H2
  pushing to $TESTTMP/r
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files (+1 heads)

  $ cd ../r
  $ hg cat -r $REV target | head -n 10
  $ hg cat -r $CLEANREV target | head -n 10
  Re-sanitized; nothing to see here
  $ hg update $CLEANREV
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Re-sanitized; nothing to see here

Censored nodes can be bundled up and unbundled in another repo

  $ hg bundle --base 0 ../pwbundle
  13 changesets found
  $ cd ../rclone
  $ hg unbundle ../pwbundle
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  new changesets * (glob)
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg cat -r $REV target | head -n 10
  $ hg cat -r $CLEANREV target | head -n 10
  Re-sanitized; nothing to see here
  $ hg update $CLEANREV
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Re-sanitized; nothing to see here
  $ hg verify -q

Grepping only warns, doesn't error out

  $ cd ../rpull
  $ hg grep 'Normal file'
  bystander:Normal file v2
  $ hg grep nothing
  target:Re-sanitized; nothing to see here
  $ hg grep --diff 'Normal file'
  cannot search in censored file: target:7
  cannot search in censored file: target:10
  cannot search in censored file: target:12
  bystander:6:-:Normal file v2
  cannot search in censored file: target:1
  cannot search in censored file: target:2
  cannot search in censored file: target:3
  bystander:2:-:Normal file here
  bystander:2:+:Normal file v2
  bystander:0:+:Normal file here
  $ hg grep --diff nothing
  cannot search in censored file: target:7
  cannot search in censored file: target:10
  cannot search in censored file: target:12
  target:13:+:Re-sanitized; nothing to see here
  cannot search in censored file: target:1
  cannot search in censored file: target:2
  cannot search in censored file: target:3

Censored nodes can be imported on top of censored nodes, consecutively

  $ hg init ../rimport
  $ hg bundle --base 1 ../rimport/splitbundle
  12 changesets found
  $ cd ../rimport
  $ hg pull -r $H1 -r $H2 ../r
  pulling from ../r
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 10 changes to 2 files (+1 heads)
  new changesets e97f55b2665a:dcbaf17bf3a1
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg unbundle splitbundle
  adding changesets
  adding manifests
  adding file changes
  added 6 changesets with 5 changes to 2 files (+1 heads)
  new changesets * (glob)
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg update $H2
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat target | head -n 10
  Re-sanitized; nothing to see here
  $ hg verify -q
  $ cd ../r

Can import bundle where first revision of a file is censored

  $ hg init ../rinit
  $ hg --config extensions.censor= censor -r 0 target
  checking for the censored content in 3 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg bundle -r 0 --base null ../rinit/initbundle
  1 changesets found
  $ cd ../rinit
  $ hg unbundle initbundle
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets e97f55b2665a (1 drafts)
  (run 'hg update' to get a working copy)
  $ hg cat -r 0 target | head -n 10

Can skip the head checking steps

  $ hg --config extensions.censor= censor -r 0  --no-check-heads target
  checking for the censored content in the working directory
  censoring 1 file revisions

Can censor multiple revision in one go.

  $ cd ../r
  $ hg --config extensions.censor= censor -r 0+1  target
  checking for the censored content in 3 heads
  checking for the censored content in the working directory
  censoring 2 file revisions



#if revlogv2

Testing feature that does not work in revlog v1
===============================================

Censoring a revision that is used as delta base
-----------------------------------------------

  $ cd ..
  $ hg init censor-with-delta
  $ cd censor-with-delta
  $ echo root > target
  $ hg add target
  $ hg commit -m root
  $ B0=`hg id --debug -i`
  $ for x in `"$PYTHON" $TESTDIR/seq.py 0 50000`
  > do
  >   echo "Password: hunter$x" >> target
  > done
  $ hg ci -m 'write a long file'
  $ B1=`hg id --debug -i`
  $ echo 'small change (should create a delta)' >> target
  $ hg ci -m 'create a delta over the password'
(should show that the last revision is a delta, not a snapshot)
  $ B2=`hg id --debug -i`

Make sure the last revision is a delta against the revision we will censor

  $ hg debugdeltachain target -T '{rev} {chainid} {chainlen} {prevrev}\n'
  0 1 1 -1
  1 2 1 -1
  2 2 2 1

Censor the file

  $ hg cat -r $B1 target | wc -l
   *50002 (re)
  $ hg --config extensions.censor= censor -r $B1 target
  checking for the censored content in 1 heads
  checking for the censored content in the working directory
  censoring 1 file revisions
  $ hg cat -r $B1 target | wc -l
   *0 (re)

Check the children is fine

  $ hg cat -r $B2 target | wc -l
   *50003 (re)

#endif

Testing repository upgrade with censors revision
================================================

  $ cd ../rclone

With the "abort" policy
=======================

  $ hg verify --config censor.policy=ignore
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checking dirstate
  checked 14 changesets with 15 changes to 2 files
  $ hg debugupgraderepo --run --quiet \
  > --optimize re-delta-parent \
  > --config censor.policy=abort
  upgrade will perform the following actions:
  
  requirements
     preserved: * (glob)
  
  optimisations: re-delta-parent
  
  processed revlogs:
    - all-filelogs
    - changelog
    - manifest
  
  $ hg verify  --config censor.policy=ignore
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checking dirstate
  checked 14 changesets with 15 changes to 2 files

With the "ignore" policy
========================

  $ hg verify --config censor.policy=ignore
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checking dirstate
  checked 14 changesets with 15 changes to 2 files
  $ hg debugupgraderepo --run --quiet \
  > --optimize re-delta-parent \
  > --config censor.policy=ignore
  upgrade will perform the following actions:
  
  requirements
     preserved: * (glob)
  
  optimisations: re-delta-parent
  
  processed revlogs:
    - all-filelogs
    - changelog
    - manifest
  
  $ hg verify --config censor.policy=ignore
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checking dirstate
  checked 14 changesets with 15 changes to 2 files