revlog: break up compression of large deltas
Python's zlib apparently makes an internal copy of strings passed to
compress(). To avoid this, compress strings 1M at a time, then join
them at the end if the result would be smaller than the original.
For initial commits of large but compressible files, this cuts peak
memory usage nearly in half.
#!/bin/sh
cat >findbranch.py <<EOF
import re, sys
head_re = re.compile('^#(?:(?:\\s+([A-Za-z][A-Za-z0-9_]*)(?:\\s.*)?)|(?:\\s*))$')
for line in sys.stdin:
hmatch = head_re.match(line)
if not hmatch:
sys.exit(1)
if hmatch.group(1) == 'Branch':
sys.exit(0)
sys.exit(1)
EOF
hg init a
cd a
echo "Rev 1" >rev
hg add rev
hg commit -m "No branch."
hg branch abranch
echo "Rev 2" >rev
hg commit -m "With branch."
if hg export 0 | python ../findbranch.py; then
echo "Export of default branch revision has Branch header" 1>&2
exit 1
fi
if hg export 1 | python ../findbranch.py; then
: # Do nothing
else
echo "Export of branch revision is missing Branch header" 1>&2
exit 1
fi
# Make sure import still works with branch information in patches.
cd ..
hg init b
cd b
hg -R ../a export 0 | hg import -
hg -R ../a export 1 | hg import -
cd ..
rm -rf b
hg init b
cd b
hg -R ../a export 0 | hg import --exact -
hg -R ../a export 1 | hg import --exact -