view tests/test-convert-p4-filetypes @ 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.

#!/bin/sh

"$TESTDIR/hghave" p4 execbit symlink || exit 80

echo "[extensions]" >> $HGRCPATH
echo "convert = " >> $HGRCPATH

echo % create p4 depot
P4ROOT=`pwd`/depot; export P4ROOT
P4AUDIT=$P4ROOT/audit; export P4AUDIT
P4JOURNAL=$P4ROOT/journal; export P4JOURNAL
P4LOG=$P4ROOT/log; export P4LOG
P4PORT=localhost:16661; export P4PORT
P4DEBUG=1; export P4DEBUG
P4CHARSET=utf8; export P4CHARSET

echo % start the p4 server
[ ! -d $P4ROOT ] && mkdir $P4ROOT
p4d -f -J off -xi >$P4ROOT/stdout 2>$P4ROOT/stderr
p4d -f -J off >$P4ROOT/stdout 2>$P4ROOT/stderr &
trap "echo % stop the p4 server ; p4 admin stop" EXIT

# wait for the server to initialize
while ! p4 ; do
   sleep 1
done >/dev/null 2>/dev/null

echo % create a client spec
P4CLIENT=hg-p4-import; export P4CLIENT
DEPOTPATH=//depot/test-mercurial-import/...
p4 client -o | sed '/^View:/,$ d' >p4client
echo View: >>p4client
echo " $DEPOTPATH //$P4CLIENT/..." >>p4client
p4 client -i <p4client

echo % populate the depot
TYPES="text binary symlink"
TYPES="$TYPES text+m text+w text+x text+k text+kx text+ko text+l text+C text+D text+F text+S text+S2"
TYPES="$TYPES binary+k binary+x binary+kx symlink+k"
TYPES="$TYPES ctext cxtext ktext kxtext ltext tempobj ubinary uxbinary xbinary xltext xtempobj xtext"
# not testing these
#TYPES="$TYPES apple resource unicode utf16 uresource xunicode xutf16"
for T in $TYPES ; do
   T2=`echo $T | tr [:upper:] [:lower:]`
   case $T in
      apple)
	 ;;
      symlink*)
         echo "this is target $T" >target_$T2
         ln -s target_$T file_$T2
         p4 add target_$T2
         p4 add -t $T file_$T2
         ;;
      binary*)
	 python -c "file('file_$T2', 'wb').write('this is $T')"
         p4 add -t $T file_$T2
         ;;
      *)
         echo "this is $T" >file_$T2
         p4 add -t $T file_$T2
         ;;
   esac
done
p4 submit -d initial

echo % test keyword expansion
p4 edit file_* target_*
for T in $TYPES ; do
   T2=`echo $T | tr [:upper:] [:lower:]`
   echo '$Id$'       >>file_$T2
   echo '$Header$'   >>file_$T2
   echo '$Date$'     >>file_$T2
   echo '$DateTime$' >>file_$T2
   echo '$Change$'   >>file_$T2
   echo '$File$'     >>file_$T2
   echo '$Revision$' >>file_$T2
   echo '$Header$$Header$Header$' >>file_$T2
done

ln -s 'target_$Header$' crazy_symlink+k
p4 add -t symlink+k crazy_symlink+k

p4 submit -d keywords

echo % check keywords in p4
grep -H Header file_*

echo % convert
hg convert -s p4 $DEPOTPATH dst
hg -R dst log --template 'rev={rev} desc="{desc}" tags="{tags}" files="{files}"\n'g

echo % revision 0
hg -R dst update 0
head dst/file_* | cat -v

echo
echo % revision 1
hg -R dst update 1
head dst/file_* | cat -v
echo
echo % crazy_symlink
readlink crazy_symlink+k
readlink dst/crazy_symlink+k