tests: document a known failing interaction between narrow and lfs

This is one of the two remaining aborts I found looking into issue5794.  I've
got no idea what's wrong with the hook, since the changes there fixed the other
two problems noted in that bug report.  It seems like it might go away when the
narrow issue is fixed, but let's make sure this doesn't get lost.

The stacktrace for the hook seems to indicate that the missing file *is* in ctx:

  remote: Traceback (most recent call last):
  remote:   File "c:\Users\Matt\projects\hg\hgext\lfs\__init__.py", line 253, in checkrequireslfs
  remote:     if any(f in ctx and match(f) and ctx[f].islfs() for f in ctx.files()):
  remote:   File "c:\Users\Matt\projects\hg\hgext\lfs\__init__.py", line 253, in <genexpr>
  remote:     if any(f in ctx and match(f) and ctx[f].islfs() for f in ctx.files()):
  remote:   File "c:\Users\Matt\projects\hg\hgext\lfs\wrapper.py", line 191, in filectxislfs
  remote:     return _islfs(self.filelog(), self.filenode())
  remote:   File "c:\Users\Matt\projects\hg\mercurial\context.py", line 631, in filenode
  remote:     return self._filenode
  remote:   File "c:\Users\Matt\projects\hg\mercurial\util.py", line 1528, in __get__
  remote:     result = self.func(obj)
  remote:   File "c:\Users\Matt\projects\hg\mercurial\context.py", line 579, in _filenode
  remote:     return self._filelog.lookup(self._fileid)
  remote:   File "c:\Users\Matt\projects\hg\mercurial\filelog.py", line 68, in lookup
  remote:     self._revlog.indexfile)
  remote:   File "c:\Users\Matt\projects\hg\mercurial\utils\storageutil.py", line 218, in fileidlookup
  remote:     raise error.LookupError(fileid, identifier, _('no match found'))
  remote: LookupError: data/inside2/f.i@f59b4e021835: no match found

tests/test-narrow-exchange.t

@@ -1,210 +1,225 b''
+#testcases lfs-on lfs-off
+
+#if lfs-on
+  $ cat >> $HGRCPATH <<EOF
+  > [extensions]
+  > lfs =
+  > EOF
+#endif
 
   $ . "$TESTDIR/narrow-library.sh"
 
 create full repo
 
   $ hg init master
   $ cd master
   $ cat >> .hg/hgrc <<EOF
   > [narrow]
   > serveellipses=True
   > EOF
 
   $ mkdir inside
   $ echo 1 > inside/f
   $ mkdir inside2
   $ echo 1 > inside2/f
   $ mkdir outside
   $ echo 1 > outside/f
   $ hg ci -Aqm 'initial'
 
   $ echo 2 > inside/f
   $ hg ci -qm 'inside 2'
 
   $ echo 2 > inside2/f
   $ hg ci -qm 'inside2 2'
 
   $ echo 2 > outside/f
   $ hg ci -qm 'outside 2'
 
   $ cd ..
 
   $ hg clone --narrow ssh://user@dummy/master narrow --include inside
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 3 changesets with 2 changes to 1 files
   new changesets *:* (glob)
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg clone --narrow ssh://user@dummy/master narrow2 --include inside --include inside2
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 4 changesets with 4 changes to 2 files
   new changesets *:* (glob)
   updating to branch default
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 Can push to wider repo if change does not affect paths in wider repo that are
 not also in narrower repo
 
   $ cd narrow
   $ echo 3 > inside/f
   $ hg ci -m 'inside 3'
   $ hg push ssh://user@dummy/narrow2
   pushing to ssh://user@dummy/narrow2
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
 
 Can push to narrower repo if change affects only paths within remote's
 narrow spec
 
   $ cd ../narrow2
   $ cat >> .hg/hgrc <<EOF
   > [narrow]
   > serveellipses=True
   > EOF
   $ hg co -r 'desc("inside 3")'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo 4 > inside/f
   $ hg ci -m 'inside 4'
   $ hg push ssh://user@dummy/narrow
   pushing to ssh://user@dummy/narrow
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
 
 Can push to narrow repo if change affects only paths outside remote's
 narrow spec
 
   $ echo 3 > inside2/f
   $ hg ci -m 'inside2 3'
 TODO: this should be successful
   $ hg push ssh://user@dummy/narrow
   pushing to ssh://user@dummy/narrow
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: transaction abort!
   remote: rollback completed
   remote: abort: data/inside2/f.i@4a1aa07735e6: unknown parent! (reporevlogstore !)
   remote: abort: data/inside2/f/index@4a1aa07735e6: no node! (reposimplestore !)
   abort: stream ended unexpectedly (got 0 bytes, expected 4)
   [255]
 
 Can pull from wider repo if change affects only paths outside remote's
 narrow spec
   $ echo 4 > inside2/f
   $ hg ci -m 'inside2 4'
   $ hg log -G -T '{rev} {node|short} {files}\n'
   @  7 d78a96df731d inside2/f
   |
   o  6 8c26f5218962 inside2/f
   |
   o  5 ba3480e2f9de inside/f
   |
   o  4 4e5edd526618 inside/f
   |
   o  3 81e7e07b7ab0 outside/f
   |
   o  2 f3993b8c0c2b inside2/f
   |
   o  1 8cd66ca966b4 inside/f
   |
   o  0 c8057d6f53ab inside/f inside2/f outside/f
   
   $ cd ../narrow
   $ hg log -G -T '{rev} {node|short} {files}\n'
   o  4 ba3480e2f9de inside/f
   |
   @  3 4e5edd526618 inside/f
   |
   o  2 81e7e07b7ab0 outside/f
   |
   o  1 8cd66ca966b4 inside/f
   |
   o  0 c8057d6f53ab inside/f inside2/f outside/f
   
   $ hg pull ssh://user@dummy/narrow2
   pulling from ssh://user@dummy/narrow2
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 0 changes to 0 files
   new changesets d78a96df731d
   (run 'hg update' to get a working copy)
 
 Check that the resulting history is valid in the full repo
 
   $ cd ../narrow2
   $ hg push ssh://user@dummy/master
   pushing to ssh://user@dummy/master
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 4 changesets with 4 changes to 2 files
   $ cd ../master
   $ hg verify
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 8 changesets with 10 changes to 3 files
 
 Can not push to wider repo if change affects paths in wider repo that are
 not also in narrower repo
   $ cd ../master
   $ hg co -r 'desc("inside2 4")'
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo 5 > inside2/f
   $ hg ci -m 'inside2 5'
   $ hg log -G -T '{rev} {node|short} {files}\n'
   @  8 5970befb64ba inside2/f
   |
   o  7 d78a96df731d inside2/f
   |
   o  6 8c26f5218962 inside2/f
   |
   o  5 ba3480e2f9de inside/f
   |
   o  4 4e5edd526618 inside/f
   |
   o  3 81e7e07b7ab0 outside/f
   |
   o  2 f3993b8c0c2b inside2/f
   |
   o  1 8cd66ca966b4 inside/f
   |
   o  0 c8057d6f53ab inside/f inside2/f outside/f
   
   $ cd ../narrow
   $ hg pull
   pulling from ssh://user@dummy/master
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 0 changes to 0 files
   new changesets * (glob)
   (run 'hg update' to get a working copy)
 TODO: this should tell the user that their narrow clone does not have the
 necessary content to be able to push to the target
-  $ hg push ssh://user@dummy/narrow2
+
+TODO: lfs shouldn't abort like this
+  $ hg push ssh://user@dummy/narrow2 || true
   pushing to ssh://user@dummy/narrow2
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 0 changes to 0 files
+  remote: error: pretxnchangegroup.lfs hook raised an exception: data/inside2/f.i@f59b4e021835: no match found (lfs-on !)
+  remote: transaction abort! (lfs-on !)
+  remote: rollback completed (lfs-on !)
+  remote: abort: data/inside2/f.i@f59b4e021835: no match found! (lfs-on !)
+  abort: stream ended unexpectedly (got 0 bytes, expected 4) (lfs-on !)