lfs: add a test showing bundle application could be broken stable

lfs: add a test showing bundle application could be broken

When a bundle containing LFS delta uses non-LFS delta-base, or vice-versa,
the bundle will fail to apply.

Differential Revision: https://phab.mercurial-scm.org/D2066

--- a/tests/drawdag.py	Sun Mar 04 14:53:57 2018 -0500
+++ b/tests/drawdag.py	Tue Feb 06 16:08:57 2018 -0800
@@ -371,7 +371,8 @@
     comments = list(_getcomments(text))
     filere = re.compile(br'^(\w+)/([\w/]+)\s*=\s*(.*)$', re.M)
     for name, path, content in filere.findall(b'\n'.join(comments)):
-        files[name][path] = content.replace(br'\n', b'\n')
+        content = content.replace(br'\n', b'\n').replace(br'\1', b'\1')
+        files[name][path] = content
 
     committed = {None: node.nullid}  # {name: node}
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-lfs-bundle.t	Tue Feb 06 16:08:57 2018 -0800
@@ -0,0 +1,100 @@
+In this test, we want to test LFS bundle application on both LFS and non-LFS
+repos.
+
+To make it more interesting, the file revisions will contain hg filelog
+metadata ('\1\n'). The bundle will have 1 file revision overlapping with the
+destination repo.
+
+#  rev      1          2         3
+#  repo:    yes        yes       no
+#  bundle:  no (base)  yes       yes (deltabase: 2 if possible)
+
+It is interesting because rev 2 could have been stored as LFS in the repo, and
+non-LFS in the bundle; or vice-versa.
+
+Init
+
+  $ cat >> $HGRCPATH << EOF
+  > [extensions]
+  > lfs=
+  > drawdag=$TESTDIR/drawdag.py
+  > [lfs]
+  > url=file:$TESTTMP/lfs-remote
+  > EOF
+
+Helper functions
+
+  $ commitxy() {
+  > hg debugdrawdag "$@" <<'EOS'
+  >  Y  # Y/X=\1\nAAAA\nE\nF
+  >  |  # Y/Y=\1\nAAAA\nG\nH
+  >  X  # X/X=\1\nAAAA\nC\n
+  >     # X/Y=\1\nAAAA\nD\n
+  > EOS
+  > }
+
+  $ commitz() {
+  > hg debugdrawdag "$@" <<'EOS'
+  >  Z  # Z/X=\1\nAAAA\nI\n
+  >  |  # Z/Y=\1\nAAAA\nJ\n
+  >  |  # Z/Z=\1\nZ
+  >  Y
+  > EOS
+  > }
+
+  $ enablelfs() {
+  >   cat >> .hg/hgrc <<EOF
+  > [lfs]
+  > track=all()
+  > EOF
+  > }
+
+Generate bundles
+
+  $ for i in normal lfs; do
+  >   NAME=src-$i
+  >   hg init $TESTTMP/$NAME
+  >   cd $TESTTMP/$NAME
+  >   [ $i = lfs ] && enablelfs
+  >   commitxy
+  >   commitz
+  >   hg bundle -q --base X -r Y+Z $TESTTMP/$NAME.bundle
+  >   SRCNAMES="$SRCNAMES $NAME"
+  > done
+
+Prepare destination repos
+
+  $ for i in normal lfs; do
+  >   NAME=dst-$i
+  >   hg init $TESTTMP/$NAME
+  >   cd $TESTTMP/$NAME
+  >   [ $i = lfs ] && enablelfs
+  >   commitxy
+  >   DSTNAMES="$DSTNAMES $NAME"
+  > done
+
+Apply bundles
+
+  $ for i in $SRCNAMES; do
+  >   for j in $DSTNAMES; do
+  >     echo ---- Applying $i.bundle to $j ----
+  >     cp -R $TESTTMP/$j $TESTTMP/tmp-$i-$j
+  >     cd $TESTTMP/tmp-$i-$j
+  >     if hg unbundle $TESTTMP/$i.bundle -q 2>/dev/null; then
+  >       hg verify -q && echo OK
+  >     else
+  >       echo CRASHED
+  >     fi
+  >   done
+  > done
+  ---- Applying src-normal.bundle to dst-normal ----
+  OK
+  ---- Applying src-normal.bundle to dst-lfs ----
+   X@2: unpacking bcc7d23fa6b7: integrity check failed on data/X.i:2
+   Y@2: unpacking 46017a6640e7: integrity check failed on data/Y.i:2
+  2 integrity errors encountered!
+  (first damaged changeset appears to be 2)
+  ---- Applying src-lfs.bundle to dst-normal ----
+  CRASHED
+  ---- Applying src-lfs.bundle to dst-lfs ----
+  OK