largefiles: test interaction between largefiles and vanilla clients and servers

This reintroduces tests for the case described by issue3066, among others:
- vanilla clients and servers should still be able to talk to largefiles
  clients and servers about vanilla repos
- vanilla clients should not attempt to clone largefiles repos over http and
  should report a useful error message (issue3066; this appears to work
  correctly)
- vanilla clients should not attempt to clone largefiles repos over ssh, again
  with a useful error message
- largefiles clients should not attempt to push largefile changes to vanilla
  servers

tests/test-largefiles.t

@@ -1,760 +1,849
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > largefiles=
   > purge=
   > rebase=
   > [largefiles]
   > minsize=2
   > patterns=glob:**.dat
   > EOF
 
 Create the repo with a couple of revisions of both large and normal
 files, testing that status correctly shows largefiles.
 
   $ hg init a
   $ cd a
   $ mkdir sub
   $ echo normal1 > normal1
   $ echo normal2 > sub/normal2
   $ echo large1 > large1
   $ echo large2 > sub/large2
   $ hg add normal1 sub/normal2
   $ hg add --large large1 sub/large2
   $ hg commit -m "add files"
   $ echo normal11 > normal1
   $ echo normal22 > sub/normal2
   $ echo large11 > large1
   $ echo large22 > sub/large2
   $ hg st
   M large1
   M normal1
   M sub/large2
   M sub/normal2
   $ hg commit -m "edit files"
 
 Commit preserved largefile contents.
 
   $ cat normal1
   normal11
   $ cat large1
   large11
   $ cat sub/normal2
   normal22
   $ cat sub/large2
   large22
 
 Remove both largefiles and normal files.
  
   $ hg remove normal1 large1
   $ hg commit -m "remove files"
   $ ls
   sub
 
 Copy both largefiles and normal files.
 
   $ hg cp sub/normal2 normal1
   $ hg cp sub/large2 large1
   $ hg commit -m "copy files"
   $ cat normal1
   normal22
   $ cat large1
   large22
 
 Test moving largefiles and verify that normal files are also unaffected.
 
   $ hg mv normal1 normal3
   $ hg mv large1 large3
   $ hg mv sub/normal2 sub/normal4
   $ hg mv sub/large2 sub/large4
   $ hg commit -m "move files"
   $ cat normal3
   normal22
   $ cat large3
   large22
   $ cat sub/normal4
   normal22
   $ cat sub/large4
   large22
 
 Test archiving the various revisions.  These hit corner cases known with
 archiving.
 
   $ hg archive -r 0 ../archive0
   $ hg archive -r 1 ../archive1
   $ hg archive -r 2 ../archive2
   $ hg archive -r 3 ../archive3
   $ hg archive -r 4 ../archive4
   $ cd ../archive0
   $ cat normal1 
   normal1
   $ cat large1
   large1
   $ cat sub/normal2
   normal2
   $ cat sub/large2
   large2
   $ cd ../archive1
   $ cat normal1
   normal11
   $ cat large1
   large11
   $ cat sub/normal2
   normal22
   $ cat sub/large2
   large22
   $ cd ../archive2
   $ ls
   sub
   $ cat sub/normal2
   normal22
   $ cat sub/large2
   large22
   $ cd ../archive3
   $ cat normal1
   normal22
   $ cat large1
   large22
   $ cat sub/normal2
   normal22
   $ cat sub/large2
   large22
   $ cd ../archive4
   $ cat normal3
   normal22
   $ cat large3
   large22
   $ cat sub/normal4
   normal22
   $ cat sub/large4
   large22
 
 Commit corner case: specify files to commit.
 
   $ cd ../a
   $ echo normal3 > normal3
   $ echo large3 > large3
   $ echo normal4 > sub/normal4
   $ echo large4 > sub/large4
   $ hg commit normal3 large3 sub/normal4 sub/large4 -m "edit files again"
   $ cat normal3
   normal3
   $ cat large3
   large3
   $ cat sub/normal4
   normal4
   $ cat sub/large4
   large4
 
 One more commit corner case: commit from a subdirectory.
 
   $ cd ../a
   $ echo normal33 > normal3
   $ echo large33 > large3
   $ echo normal44 > sub/normal4
   $ echo large44 > sub/large4
   $ cd sub
   $ hg commit -m "edit files yet again"
   $ cat ../normal3
   normal33
   $ cat ../large3
   large33
   $ cat normal4
   normal44
   $ cat large4
   large44
 
 Committing standins is not allowed.
 
   $ cd ..
   $ echo large3 > large3
   $ hg commit .hglf/large3 -m "try to commit standin"
   abort: file ".hglf/large3" is a largefile standin
   (commit the largefile itself instead)
   [255]
 
 Corner cases for adding largefiles.
 
   $ echo large5 > large5
   $ hg add --large large5
   $ hg add --large large5
   large5 already a largefile
   $ mkdir sub2
   $ echo large6 > sub2/large6
   $ echo large7 > sub2/large7
   $ hg add --large sub2
   adding sub2/large6 as a largefile
   adding sub2/large7 as a largefile
   $ hg st
   M large3
   A large5
   A sub2/large6
   A sub2/large7
 
 Config settings (pattern **.dat, minsize 2 MB) are respected.
 
   $ echo testdata > test.dat
   $ dd bs=1k count=2k if=/dev/zero of=reallylarge > /dev/null 2> /dev/null
   $ hg add
   adding reallylarge as a largefile
   adding test.dat as a largefile
 
 Test that minsize and --lfsize handle float values;
 also tests that --lfsize overrides largefiles.minsize.
 (0.250 MB = 256 kB = 262144 B)
 
   $ dd if=/dev/zero of=ratherlarge bs=1024 count=256 > /dev/null 2> /dev/null
   $ dd if=/dev/zero of=medium bs=1024 count=128 > /dev/null 2> /dev/null
   $ hg --config largefiles.minsize=.25 add
   adding ratherlarge as a largefile
   adding medium
   $ hg forget medium
   $ hg --config largefiles.minsize=.25 add --lfsize=.125
   adding medium as a largefile
   $ dd if=/dev/zero of=notlarge bs=1024 count=127 > /dev/null 2> /dev/null
   $ hg --config largefiles.minsize=.25 add --lfsize=.125
   adding notlarge
   $ hg forget notlarge
 
 Test forget on largefiles.
 
   $ hg forget large3 large5 test.dat reallylarge ratherlarge medium
   $ hg st
   A sub2/large6
   A sub2/large7
   R large3
   ? large5
   ? medium
   ? notlarge
   ? ratherlarge
   ? reallylarge
   ? test.dat
   $ hg commit -m "add/edit more largefiles"
   $ hg st
   ? large3
   ? large5
   ? medium
   ? notlarge
   ? ratherlarge
   ? reallylarge
   ? test.dat
 
 Purge with largefiles: verify that largefiles are still in the working
 dir after a purge.
 
   $ hg purge --all
   $ cat sub/large4
   large44
   $ cat sub2/large6
   large6
   $ cat sub2/large7
   large7
 
 Clone a largefiles repo.
 
   $ cd ..
   $ hg clone a b
   updating to branch default
   5 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   3 largefiles updated, 0 removed
   $ cd b
   $ hg log
   changeset:   7:daea875e9014
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add/edit more largefiles
   
   changeset:   6:4355d653f84f
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files yet again
   
   changeset:   5:9d5af5072dbd
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files again
   
   changeset:   4:74c02385b94c
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     move files
   
   changeset:   3:9e8fbc4bce62
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     copy files
   
   changeset:   2:51a0ae4d5864
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     remove files
   
   changeset:   1:ce8896473775
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files
   
   changeset:   0:30d30fe6a5be
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add files
   
   $ cat normal3
   normal33
   $ cat sub/normal4
   normal44
   $ cat sub/large4
   large44
   $ cat sub2/large6
   large6
   $ cat sub2/large7
   large7
   $ cd ..
   $ hg clone a -r 3 c
   adding changesets
   adding manifests
   adding file changes
   added 4 changesets with 10 changes to 4 files
   updating to branch default
   4 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   2 largefiles updated, 0 removed
   $ cd c
   $ hg log
   changeset:   3:9e8fbc4bce62
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     copy files
   
   changeset:   2:51a0ae4d5864
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     remove files
   
   changeset:   1:ce8896473775
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files
   
   changeset:   0:30d30fe6a5be
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add files
   
   $ cat normal1
   normal22
   $ cat large1
   large22
   $ cat sub/normal2
   normal22
   $ cat sub/large2
   large22
 
 Old revisions of a clone have correct largefiles content (this also
 tests update).
 
   $ hg update -r 1 
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat large1
   large11
   $ cat sub/large2
   large22
 
 Rebasing between two repositories does not revert largefiles to old
 revisions (this was a very bad bug that took a lot of work to fix).
 
   $ cd ..
   $ hg clone a d
   updating to branch default
   5 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   3 largefiles updated, 0 removed
   $ cd b
   $ echo large4-modified > sub/large4
   $ echo normal3-modified > normal3
   $ hg commit -m "modify normal file and largefile in repo b"
   $ cd ../d
   $ echo large6-modified > sub2/large6
   $ echo normal4-modified > sub/normal4
   $ hg commit -m "modify normal file largefile in repo d"
   $ cd ..
   $ hg clone d e
   updating to branch default
   5 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   3 largefiles updated, 0 removed
   $ cd d
   $ hg pull --rebase ../b
   pulling from ../b
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 2 changes to 2 files (+1 heads)
   getting changed largefiles
   1 largefiles updated, 0 removed
   saved backup bundle to $TESTTMP/d/.hg/strip-backup/f574fb32bb45-backup.hg
   nothing to rebase
   $ hg log
   changeset:   9:598410d3eb9a
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     modify normal file largefile in repo d
   
   changeset:   8:a381d2c8c80e
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     modify normal file and largefile in repo b
   
   changeset:   7:daea875e9014
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add/edit more largefiles
   
   changeset:   6:4355d653f84f
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files yet again
   
   changeset:   5:9d5af5072dbd
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files again
   
   changeset:   4:74c02385b94c
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     move files
   
   changeset:   3:9e8fbc4bce62
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     copy files
   
   changeset:   2:51a0ae4d5864
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     remove files
   
   changeset:   1:ce8896473775
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files
   
   changeset:   0:30d30fe6a5be
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add files
   
   $ cat normal3
   normal3-modified
   $ cat sub/normal4
   normal4-modified
   $ cat sub/large4
   large4-modified
   $ cat sub2/large6
   large6-modified
   $ cat sub2/large7
   large7
   $ cd ../e
   $ hg pull ../b
   pulling from ../b
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 2 changes to 2 files (+1 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg rebase
   getting changed largefiles
   1 largefiles updated, 0 removed
   saved backup bundle to $TESTTMP/e/.hg/strip-backup/f574fb32bb45-backup.hg
   $ hg log
   changeset:   9:598410d3eb9a
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     modify normal file largefile in repo d
   
   changeset:   8:a381d2c8c80e
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     modify normal file and largefile in repo b
   
   changeset:   7:daea875e9014
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add/edit more largefiles
   
   changeset:   6:4355d653f84f
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files yet again
   
   changeset:   5:9d5af5072dbd
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files again
   
   changeset:   4:74c02385b94c
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     move files
   
   changeset:   3:9e8fbc4bce62
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     copy files
   
   changeset:   2:51a0ae4d5864
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     remove files
   
   changeset:   1:ce8896473775
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files
   
   changeset:   0:30d30fe6a5be
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add files
   
   $ cat normal3
   normal3-modified
   $ cat sub/normal4
   normal4-modified
   $ cat sub/large4
   large4-modified
   $ cat sub2/large6
   large6-modified
   $ cat sub2/large7
   large7
 
 Rollback on largefiles.
 
   $ echo large4-modified-again > sub/large4 
   $ hg commit -m "Modify large4 again"
   $ hg rollback
   repository tip rolled back to revision 9 (undo commit)
   working directory now based on revision 9
   $ hg st
   M sub/large4
   $ hg log
   changeset:   9:598410d3eb9a
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     modify normal file largefile in repo d
   
   changeset:   8:a381d2c8c80e
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     modify normal file and largefile in repo b
   
   changeset:   7:daea875e9014
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add/edit more largefiles
   
   changeset:   6:4355d653f84f
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files yet again
   
   changeset:   5:9d5af5072dbd
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files again
   
   changeset:   4:74c02385b94c
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     move files
   
   changeset:   3:9e8fbc4bce62
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     copy files
   
   changeset:   2:51a0ae4d5864
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     remove files
   
   changeset:   1:ce8896473775
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     edit files
   
   changeset:   0:30d30fe6a5be
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add files
   
   $ cat sub/large4
   large4-modified-again
 
 "update --clean" leaves correct largefiles in working copy.
 
   $ hg update --clean 
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat normal3
   normal3-modified
   $ cat sub/normal4
   normal4-modified
   $ cat sub/large4
   large4-modified
   $ cat sub2/large6
   large6-modified
   $ cat sub2/large7
   large7
 
 "verify --large" actaully verifies largefiles
 
   $ hg verify --large
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   10 files, 10 changesets, 28 total revisions
   searching 1 changesets for largefiles
   verified existence of 3 revisions of 3 largefiles
 
 Merging does not revert to old versions of largefiles (this has also
 been very problematic).
 
   $ cd ..
   $ hg clone -r 7 e f
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 24 changes to 10 files
   updating to branch default
   5 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   3 largefiles updated, 0 removed
   $ cd f
   $ echo "large4-merge-test" > sub/large4
   $ hg commit -m "Modify large4 to test merge"
   $ hg pull ../e
   pulling from ../e
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 2 changesets with 4 changes to 4 files (+1 heads)
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg merge
   merging sub/large4
   largefile sub/large4 has a merge conflict
   keep (l)ocal or take (o)ther? l
   3 files updated, 1 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ hg commit -m "Merge repos e and f"
   $ cat normal3
   normal3-modified
   $ cat sub/normal4
   normal4-modified
   $ cat sub/large4
   large4-merge-test
   $ cat sub2/large6
   large6-modified
   $ cat sub2/large7
   large7
   $ cd ..
 
+vanilla clients not locked out from largefiles servers on vanilla repos
+  $ mkdir r1
+  $ cd r1
+  $ hg init
+  $ echo c1 > f1
+  $ hg add f1
+  $ hg com -m "m1"
+  $ cd ..
+  $ hg serve -R r1 -d -p 8001 --pid-file serve.pid
+  $ hg --config extensions.largefiles=! clone http://localhost:8001 r2
+  requesting all changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ kill $(cat serve.pid)
+
+largefiles clients still work with vanilla servers
+  $ hg --config extensions.largefiles=! serve -R r1 -d -p 8001 --pid-file serve.pid
+  $ hg clone http://localhost:8001 r3
+  requesting all changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ kill $(cat serve.pid)
+
+vanilla clients locked out from largefiles http repos
+  $ mkdir r4
+  $ cd r4
+  $ hg init
+  $ echo c1 > f1
+  $ hg add --large f1
+  $ hg com -m "m1"
+  $ cd ..
+  $ hg serve -R r4 -d -p 8001 --pid-file serve.pid
+  $ hg --config extensions.largefiles=! clone http://localhost:8001 r5
+  abort: remote error:
+  
+  This repository uses the largefiles extension.
+  
+  Please enable it in your Mercurial config file.
+  [255]
+  $ kill $(cat serve.pid)
+
+vanilla clients locked out from largefiles ssh repos
+  $ hg --config extensions.largefiles=! clone -e "python $TESTDIR/dummyssh" ssh://user@dummy/r4 r5
+  abort: remote error:
+  
+  This repository uses the largefiles extension.
+  
+  Please enable it in your Mercurial config file.
+  [255]
+
+largefiles clients refuse to push largefiles repos to vanilla servers
+  $ mkdir r6
+  $ cd r6
+  $ hg init
+  $ echo c1 > f1
+  $ hg add f1
+  $ hg com -m "m1"
+  $ cat >> .hg/hgrc <<!
+  > [web]
+  > push_ssl = false
+  > allow_push = *
+  > !
+  $ cd ..
+  $ hg clone r6 r7
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cd r7
+  $ echo c2 > f2
+  $ hg add --large f2
+  $ hg com -m "m2"
+  $ hg --config extensions.largefiles=! -R ../r6 serve -d -p 8001 --pid-file ../serve.pid
+  $ hg push http://localhost:8001
+  pushing to http://localhost:8001/
+  searching for changes
+  abort: http://localhost:8001/ does not appear to be a largefile store
+  [255]
+  $ cd ..
+  $ kill $(cat serve.pid)
+
+  $ cd ..
+
 "lfconvert" works
   $ hg init bigfile-repo
   $ cd bigfile-repo
   $ dd if=/dev/zero bs=1k count=256 > a-large-file 2> /dev/null
   $ hg addremove
   adding a-large-file
   $ hg commit -m "add a-large-file (as a normal file)"
   $ find .hg/largefiles
   .hg/largefiles
   $ cd ..
   $ hg lfconvert --size 0.2 bigfile-repo largefiles-repo
   initializing destination largefiles-repo
 
 "lfconvert" adds 'largefiles' to .hg/requires.
   $ cat largefiles-repo/.hg/requires
   largefiles
   revlogv1
   fncache
   store
   dotencode
 
 "lfconvert" includes a newline at the end of the standin files.
   $ cd largefiles-repo
   $ hg up
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat .hglf/a-large-file
   2e000fa7e85759c7f4c254d4d9c33ef481e459a7
   $ dd if=/dev/zero bs=1k count=1k > another-large-file 2> /dev/null
   $ hg add --lfsize=1 another-large-file
   $ hg commit -m "add another-large-file (should be a largefile)"
   $ cat .hglf/a-large-file .hglf/another-large-file
   2e000fa7e85759c7f4c254d4d9c33ef481e459a7
   3b71f43ff30f4b15b5cd85dd9e95ebc7e84eb5a3
 
 Convert back to a normal (non-largefiles) repo
   $ hg lfconvert --to-normal . ../normal-repo
   initializing destination ../normal-repo
   $ cd ../normal-repo
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
   > largefiles = !
   > EOF
   $ hg update
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg locate
   a-large-file
   another-large-file
   $ [ -d .hg/largefiles ] && echo fail || echo pass
   pass
 
 Cleanup
   $ cd ..
   $ rm -rf bigfile-repo largefiles-repo normal-repo
 Clone a local repository owned by another user
 We have to simulate that here by setting $HOME and removing write permissions
   $ ORIGHOME="$HOME"
   $ mkdir alice
   $ HOME="`pwd`/alice"
   $ cd alice
   $ hg init pubrepo
   $ cd pubrepo
   $ dd if=/dev/urandom bs=1k count=11k > a-large-file 2> /dev/null
   $ hg add --large a-large-file
   $ hg commit -m "Add a large file"
   $ cd ..
   $ chmod -R a-w pubrepo
   $ cd ..
   $ mkdir bob
   $ HOME="`pwd`/bob"
   $ cd bob
   $ hg clone ../alice/pubrepo pubrepo
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cd ..
   $ HOME="$ORIGHOME"