tests/test-hgwebdirsym.t

windows: recompute flags when committing a merge (issue1802)

Before this patch, Windows always did the wrong thing with exec bits
when committing a merge: consult the flags in first parent.

Now we manually recompute the result of merging flags at commit time,
which almost always does the right thing (except when there are
conflicts between symlink and exec flags).

To do this, we:

- pull flag synthesis out into its own function
- delay building this function unless it's needed
- add a merge case that compares flags in local and other against the ancestor

This has been tested in multiple ways on Linux:

- running the whole test suite with both old and new code in place,
  checking for differences in each flags() result
- running the whole test suite while comparing real on-disk flags
  against synthetic ones for merges
- test-issue1802 (from Martin Geisler) which disables exec bit
  checking on Unix

Tests whether or not hgwebdir properly handles various symlink topologies.

  $ "$TESTDIR/hghave" symlink || exit 80
  $ hg init a
  $ echo a > a/a
  $ hg --cwd a ci -Ama -d'1 0'
  adding a
  $ mkdir webdir
  $ cd webdir
  $ hg init b
  $ echo b > b/b
  $ hg --cwd b ci -Amb -d'2 0'
  adding b
  $ hg init c
  $ echo c > c/c
  $ hg --cwd c ci -Amc -d'3 0'
  adding c
  $ ln -s ../a al
  $ ln -s ../webdir circle
  $ root=`pwd`
  $ cd ..
  $ cat > collections.conf <<EOF
  > [collections]
  > $root=$root
  > EOF
  $ hg serve -p $HGPORT -d --pid-file=hg.pid --webdir-conf collections.conf \
  >     -A access-collections.log -E error-collections.log
  $ cat hg.pid >> $DAEMON_PIDS

should succeed

  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/?style=raw'
  200 Script output follows
  
  
  /al/
  /b/
  /c/
  
  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/al/file/tip/a?style=raw'
  200 Script output follows
  
  a
  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/b/file/tip/b?style=raw'
  200 Script output follows
  
  b
  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/c/file/tip/c?style=raw'
  200 Script output follows
  
  c

should fail

  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/circle/al/file/tip/a?style=raw'
  404 Not Found
  
  
  error: repository circle/al/file/tip/a not found
  [1]
  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/circle/b/file/tip/a?style=raw'
  404 Not Found
  
  
  error: repository circle/b/file/tip/a not found
  [1]
  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/circle/c/file/tip/a?style=raw'
  404 Not Found
  
  
  error: repository circle/c/file/tip/a not found
  [1]

collections errors

  $ cat error-collections.log