convert: add a mode where mercurial_sink skips empty revisions. The getchanges function of some converter_source classes can return some false positives. I.e. they sometimes claim that a file "foo" was changed in some revision, even though its contents are still the same. convert_svn is particularly bad, but I think this can also happen with convert_cvs and, at least in theory, with mercurial_source. For regular conversions this is not really a problem - as long as getfile returns the right contents, we'll get a converted revision with the right contents. But when we use --filemap, this could lead to superfluous revisions being converted. Instead of fixing every converter_source, I decided to change mercurial_sink to work around this problem. When --filemap is used, we're interested only in revisions that touch some specific files. If a revision doesn't change any of these files, then we're not interested in it (at least for revisions with a single parent; merges are special). For mercurial_sink, we abuse this property and rollback a commit if the manifest text hasn't changed. This avoids duplicating the logic from localrepo.filecommit to detect unchanged files.

#!/bin/sh

hg init

# Test issue 562: .hgignore requires newline at end
touch foo
touch bar
touch baz
cat > makeignore.py <<EOF
f = open(".hgignore", "w")
f.write("ignore\n")
f.write("foo\n")
# No EOL here
f.write("bar")
f.close()
EOF

python makeignore.py
echo % should display baz only
hg status
rm foo bar baz .hgignore makeignore.py

touch a.o
touch a.c
touch syntax
mkdir dir
touch dir/a.o
touch dir/b.o
touch dir/c.o

hg add dir/a.o
hg commit -m 0
hg add dir/b.o

echo "--" ; hg status

echo "*.o" > .hgignore
echo "--" ; hg status 2>&1 | sed -e 's/abort: .*\.hgignore:/abort: .hgignore:/'

echo ".*\.o" > .hgignore
echo "--" ; hg status

echo "glob:**.o" > .hgignore
echo "--" ; hg status

echo "glob:*.o" > .hgignore
echo "--" ; hg status

echo "syntax: glob" > .hgignore
echo "re:.*\.o" >> .hgignore
echo "--" ; hg status

echo "syntax: invalid" > .hgignore
echo "--" ; hg status 2>&1 | sed -e 's/.*\.hgignore:/.hgignore:/'

echo "syntax: glob" > .hgignore
echo "*.o" >> .hgignore
echo "--" ; hg status

echo "relglob:syntax*" > .hgignore
echo "--" ; hg status

echo "relglob:*" > .hgignore
echo "--" ; hg status

cd dir
echo "--" ; hg status .