view tests/test-subrepo-svn.t @ 12938:bf826c0b9537 stable

opener: check hardlink count reporting (issue1866)

The Linux CIFS kernel driver (even in 2.6.36) suffers from a hardlink
count blindness bug (lstat() returning 1 in st_nlink when it is expected
to return >1), which causes repository corruption if Mercurial running
on Linux pushes or commits to a hardlinked repository stored on a Windows
share, if that share is mounted using the CIFS driver.

This patch works around issue1866 and improves the workaround done in
50523b4407f6 to fix issue761, by teaching the opener to lazily execute a
runtime check (new function checknlink) to see if the hardlink count
reported by nlinks() can be trusted.

Since nlinks() is also known to return varying count values (1 or >1)
depending on whether the file is open or not and depending on what client
and server software combination is being used for accessing and serving
the Windows share, we deliberately open the file before calling nlinks() in
order to have a stable precondition. Trying to depend on the precondition
"file closed" would be fragile, as the file could have been opened very
easily somewhere else in the program.

  $ "$TESTDIR/hghave" svn || exit 80

  $ fix_path()
  > {
  >     tr '\\' /
  > }

SVN wants all paths to start with a slash. Unfortunately, Windows ones
don't. Handle that.

  $ escapedwd=`pwd | fix_path`
  $ expr "$escapedwd" : '\/' > /dev/null || escapedwd="/$escapedwd"
  $ escapedwd=`python -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$escapedwd"`

create subversion repo

  $ SVNREPO="file://$escapedwd/svn-repo"
  $ WCROOT="`pwd`/svn-wc"
  $ svnadmin create svn-repo
  $ svn co "$SVNREPO" svn-wc
  Checked out revision 0.
  $ cd svn-wc
  $ mkdir src
  $ echo alpha > src/alpha
  $ svn add src
  A         src
  A         src/alpha
  $ mkdir externals
  $ echo other > externals/other
  $ svn add externals
  A         externals
  A         externals/other
  $ svn ci -m 'Add alpha'
  Adding         externals
  Adding         externals/other
  Adding         src
  Adding         src/alpha
  Transmitting file data ..
  Committed revision 1.
  $ svn up
  At revision 1.
  $ echo "externals -r1 $SVNREPO/externals" > extdef
  $ svn propset -F extdef svn:externals src
  property 'svn:externals' set on 'src'
  $ svn ci -m 'Setting externals'
  Sending        src
  
  Committed revision 2.
  $ cd ..

create hg repo

  $ mkdir sub
  $ cd sub
  $ hg init t
  $ cd t

first revision, no sub

  $ echo a > a
  $ hg ci -Am0
  adding a

add first svn sub with leading whitespaces

  $ echo "s = [svn]       $SVNREPO/src" >> .hgsub
  $ svn co --quiet "$SVNREPO"/src s
  $ hg add .hgsub
  $ hg ci -m1
  committing subrepository s

make sure we avoid empty commits (issue2445)

  $ hg sum
  parent: 1:* tip (glob)
   1
  branch: default
  commit: (clean)
  update: (current)
  $ hg ci -moops
  nothing changed
  [1]

debugsub

  $ hg debugsub
  path s
   source   file://*/svn-repo/src (glob)
   revision 2

change file in svn and hg, commit

  $ echo a >> a
  $ echo alpha >> s/alpha
  $ hg sum
  parent: 1:* tip (glob)
   1
  branch: default
  commit: 1 modified, 1 subrepos
  update: (current)
  $ hg commit -m 'Message!'
  committing subrepository s
  Sending*s/alpha (glob)
  Transmitting file data .
  Committed revision 3.
  
  Fetching external item into '$TESTTMP/sub/t/s/externals'
  External at revision 1.
  
  At revision 3.
  $ hg debugsub
  path s
   source   file://*/svn-repo/src (glob)
   revision 3

  $ echo a > s/a

should be empty despite change to s/a

  $ hg st

add a commit from svn

  $ cd "$WCROOT"/src
  $ svn up
  U    alpha
  
  Fetching external item into 'externals'
  A    externals/other
  Updated external to revision 1.
  
  Updated to revision 3.
  $ echo xyz >> alpha
  $ svn propset svn:mime-type 'text/xml' alpha
  property 'svn:mime-type' set on 'alpha'
  $ svn ci -m 'amend a from svn'
  Sending        src/alpha
  Transmitting file data .
  Committed revision 4.
  $ cd ../../sub/t

this commit from hg will fail

  $ echo zzz >> s/alpha
  $ hg ci -m 'amend alpha from hg'
  committing subrepository s
  abort: svn: Commit failed (details follow):
  svn: (Out of date)?.*/src/alpha.*(is out of date)? (re)
  [255]
  $ svn revert -q s/alpha

this commit fails because of meta changes

  $ svn propset svn:mime-type 'text/html' s/alpha
  property 'svn:mime-type' set on 's/alpha'
  $ hg ci -m 'amend alpha from hg'
  committing subrepository s
  abort: svn: Commit failed (details follow):
  svn: (Out of date)?.*/src/alpha.*(is out of date)? (re)
  [255]
  $ svn revert -q s/alpha

this commit fails because of externals changes

  $ echo zzz > s/externals/other
  $ hg ci -m 'amend externals from hg'
  committing subrepository s
  abort: cannot commit svn externals
  [255]
  $ hg diff --subrepos -r 1:2 | grep -v diff
  --- a/.hgsubstate	Thu Jan 01 00:00:00 1970 +0000
  +++ b/.hgsubstate	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,1 @@
  -2 s
  +3 s
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,2 @@
   a
  +a
  $ svn revert -q s/externals/other

this commit fails because of externals meta changes

  $ svn propset svn:mime-type 'text/html' s/externals/other
  property 'svn:mime-type' set on 's/externals/other'
  $ hg ci -m 'amend externals from hg'
  committing subrepository s
  abort: cannot commit svn externals
  [255]
  $ svn revert -q s/externals/other

clone

  $ cd ..
  $ hg clone t tc | fix_path
  updating to branch default
  A    tc/s/alpha
   U   tc/s
  
  Fetching external item into 'tc/s/externals'
  A    tc/s/externals/other
  Checked out external at revision 1.
  
  Checked out revision 3.
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd tc

debugsub in clone

  $ hg debugsub
  path s
   source   file://*/svn-repo/src (glob)
   revision 3

verify subrepo is contained within the repo directory

  $ python -c "import os.path; print os.path.exists('s')"
  True

update to nullrev (must delete the subrepo)

  $ hg up null
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved