tests/test-convert-p4

revlog: improve delta generation heuristics for generaldelta

Without this change, pulls (and clones) into a generaldelta repository could
generate very inefficient revlogs, the size of which could be at least twice
the original size.

This was caused by the generated delta chains covering too large distances,
causing new chains to be built far too often. This change addresses the
problem by forcing a delta against second parent or against the previous
revision, when the first parent delta is in danger of creating a long chain.

#!/bin/sh

"$TESTDIR/hghave" p4 || 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

echo % start the p4 server
[ ! -d $P4ROOT ] && mkdir $P4ROOT
p4d -f -J off >$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
echo a > a
mkdir b
echo c > b/c
p4 add a b/c
p4 submit -d initial

echo % change some files
p4 edit a
echo aa >> a
p4 submit -d "change a"

p4 edit b/c
echo cc >> b/c
p4 submit -d "change b/c"

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

echo % change some files
p4 edit a b/c
echo aaa >> a
echo ccc >> b/c
p4 submit -d "change a b/c"

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

echo % interesting names
echo dddd > "d d"
mkdir " e"
echo fff >" e/ f"
p4 add "d d" " e/ f"
p4 submit -d "add d e f"

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