tests/test-revert

convert: fix mercurial_sink.putcommit

Changeset 4ebc8693ce72 added some code to putcommit to avoid creating a
revision that touches no files, but this can break regular conversions
from some repositories:

- conceptually, since we're converting a repo, we should try to make
  the new hg repo as similar as possible to the original repo - we
  should create a new changeset, even if the original revision didn't
  touch any files (maybe the commit message had some important bit);

- even if a "regular" revision that doesn't touch any file may seem
  weird (and maybe even broken), it's completely legitimate for a merge
  revision to not touch any file, and, if we just skip it, the
  converted repo will end up with wrong history and possibly an extra
  head.

  As an example, say the crew and main hg repos are sync'ed.  Somebody
  sends an important patch to the mailing list.  Matt quickly applies
  and pushes it.  But at the same time somebody also applies it to crew
  and pushes it.  Suppose the commit message ended up being a bit
  different (say, there was a typo and somebody didn't fix it) or that
  the date ended up being different (because of different patch-applying
  scripts): the changeset hashes will be different, but the manifests
  will be the same.

  Since both changesets were pushed to public repos, it's hard to recall
  them.  If both are merged, the manifest from the resulting merge
  revision will have the exact same contents as its parents - i.e. the
  merge revision really doesn't touch any file at all.

To keep the file filtering stuff "working", the generic code was changed
to skip empty revisions if we're filtering the repo, fixing a bug in the
process (we want parents[0] instead of tip).

#!/bin/sh

hg init
echo 123 > a
echo 123 > c
echo 123 > e
hg add a c e
hg commit -m "first" -d "1000000 0" a c e
echo 123 > b
echo %% should show b unknown
hg status
echo 12 > c
echo %% should show b unknown and c modified
hg status
hg add b
echo %% should show b added and c modified
hg status
hg rm a
echo %% should show a removed, b added and c modified
hg status
hg revert a
echo %% should show b added, copy saved, and c modified
hg status
hg revert b
echo %% should show b unknown, and c modified
hg status
hg revert --no-backup c
echo %% should show unknown: b
hg status
echo %% should show a b c e
ls
echo %% should verbosely save backup to e.orig
echo z > e
hg revert --all -v
echo %% should say no changes needed
hg revert a
echo %% should say file not managed
echo q > q
hg revert q
rm q
echo %% should say file not found
hg revert notfound
hg rm a
hg commit -m "second" -d "1000000 0"
echo z > z
hg add z
hg st
echo %% should add a, forget z
hg revert --all -r0
echo %% should forget a
hg revert --all -rtip
rm a *.orig
echo %% should silently add a
hg revert -r0 a
hg st a

hg update -C
chmod +x c
hg revert --all
echo %% should print non-executable
test -x c || echo non-executable

chmod +x c
hg commit -d '1000001 0' -m exe

chmod -x c
hg revert --all
echo %% should print executable
test -x c && echo executable

echo %% issue 241
hg init a
cd a
echo a >> a
hg commit -A -d '1 0' -m a
echo a >> a
hg commit -d '2 0' -m a
hg update 0
mkdir b
echo b > b/b

echo % should fail - no arguments
hg revert -rtip

echo % should succeed
hg revert --all -rtip

echo %% issue332
hg ci -A -m b -d '1000001 0'
echo foobar > b/b
mkdir newdir
echo foo > newdir/newfile
hg add newdir/newfile
hg revert b newdir
echo foobar > b/b
hg revert .
true