Windows: improve performance via buffered I/O
The posixfile_nt code hits the win32 file API directly, which
essentially amounts to performing a system call for every read and
write. This is slow.
We add a C extension that lets us use a Python file object instead,
but preserve our desired POSIX-like semantics (the ability to rename
or delete a file that is being accessed).
If the C extension is not available (e.g. in a VPS environment
without a compiler), we fall back to the posixfile_nt code.
#!/bin/sh
cat >> $HGRCPATH <<EOF
[extensions]
convert=
[convert]
hg.saverev=False
EOF
hg help convert
hg init a
cd a
echo a > a
hg ci -d'0 0' -Ama
hg cp a b
hg ci -d'1 0' -mb
hg rm a
hg ci -d'2 0' -mc
hg mv b a
hg ci -d'3 0' -md
echo a >> a
hg ci -d'4 0' -me
cd ..
hg convert a 2>&1 | grep -v 'subversion python bindings could not be loaded'
hg --cwd a-hg pull ../a
touch bogusfile
echo % should fail
hg convert a bogusfile
mkdir bogusdir
chmod 000 bogusdir
echo % should fail
hg convert a bogusdir
echo % should succeed
chmod 700 bogusdir
hg convert a bogusdir
echo % test pre and post conversion actions
echo 'include b' > filemap
hg convert --debug --filemap filemap a partialb | \
grep 'run hg'
echo % converting empty dir should fail "nicely"
mkdir emptydir
PATH=$BINDIR hg convert emptydir 2>&1 | sed 's,file://.*/emptydir,.../emptydir,g'