revlog: generate trivial deltas against null revision To avoid extra memory usage and performance issues with large files, generate a trivial delta header for deltas against the null revision rather than calling the usual delta generator. We append the delta header to meta rather than prepending it to data to avoid a large allocate and copy.

#!/bin/sh
# http://www.selenic.com/mercurial/bts/issue352

"$TESTDIR/hghave" eol-in-paths || exit 80

hg init foo
cd foo

A=`printf 'he\rllo'`

echo foo > "$A"
hg add
hg ci -A -m m
rm "$A"

echo foo > "hell
o"
hg add
hg ci -A -m m

echo foo > "$A"
hg debugwalk

exit 0