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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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test-convert-cvsnt-mergepoints
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/ tests / test-convert-cvsnt-mergepoints
#!/bin/sh
"$TESTDIR/hghave" cvs || exit 80
filterpath()
{
eval "$@" | sed "s:$CVSROOT:*REPO*:g"
}
cvscall()
{
echo cvs -f "$@"
cvs -f "$@"
}
# output of 'cvs ci' varies unpredictably, so discard most of it
# -- just keep the part that matters
cvsci()
{
echo cvs -f ci -f "$@"
cvs -f ci -f "$@" 2>&1 | egrep "^(new|initial) revision:"
}
hgcat()
{
hg --cwd src-hg cat -r tip "$1"
}
echo "[extensions]" >> $HGRCPATH
echo "convert = " >> $HGRCPATH
echo "graphlog = " >> $HGRCPATH
echo "% create cvs repository"
mkdir cvsmaster
cd cvsmaster
CVSROOT=`pwd`
export CVSROOT
CVS_OPTIONS=-f
export CVS_OPTIONS
cd ..
filterpath cvscall -Q -d "$CVSROOT" init
echo "% checkout #1: add foo.txt"
cvscall -Q checkout -d cvsworktmp .
cd cvsworktmp
mkdir foo
cvscall -Q add foo
cd foo
echo foo > foo.txt
cvscall -Q add foo.txt
cvsci -m "add foo.txt" foo.txt
cd ../..
rm -rf cvsworktmp
echo "% checkout #2: create MYBRANCH1 and modify foo.txt on it"
cvscall -Q checkout -d cvswork foo
cd cvswork
cvscall -q rtag -b -R MYBRANCH1 foo
cvscall -Q update -P -r MYBRANCH1
echo bar > foo.txt
cvsci -m "bar" foo.txt
echo baz > foo.txt
cvsci -m "baz" foo.txt
echo "% create MYBRANCH1_2 and modify foo.txt some more"
cvscall -q rtag -b -R -r MYBRANCH1 MYBRANCH1_2 foo
cvscall -Q update -P -r MYBRANCH1_2
echo bazzie > foo.txt
cvsci -m "bazzie" foo.txt
echo "% create MYBRANCH1_1 and modify foo.txt yet again"
cvscall -q rtag -b -R MYBRANCH1_1 foo
cvscall -Q update -P -r MYBRANCH1_1
echo quux > foo.txt
cvsci -m "quux" foo.txt
echo "% merge MYBRANCH1 to MYBRANCH1_1"
filterpath cvscall -Q update -P -jMYBRANCH1
# carefully placed sleep to dodge cvs bug (optimization?) where it
# sometimes ignores a "commit" command if it comes too fast (the -f
# option in cvsci seems to work for all the other commits in this
# script)
sleep 1
echo xyzzy > foo.txt
cvsci -m "merge1+clobber" foo.txt
echo "% return to trunk and merge MYBRANCH1_2"
cvscall -Q update -P -A
filterpath cvscall -Q update -P -jMYBRANCH1_2
cvsci -m "merge2" foo.txt
REALCVS=`which cvs`
echo "for x in \$*; do if [ \"\$x\" = \"rlog\" ]; then echo \"RCS file: $CVSROOT/foo/foo.txt,v\"; cat $TESTDIR/test-convert-cvsnt-mergepoints.rlog; exit 0; fi; done; $REALCVS \$*" > ../cvs
chmod +x ../cvs
PATH=..:${PATH} hg debugcvsps --parents foo | sed -e 's/Author:.*/Author:/' -e 's/Date:.*/Date:/'
cd ..