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
"$TESTDIR/hghave" git || exit 80
echo "[extensions]" >> $HGRCPATH
echo "convert=" >> $HGRCPATH
GIT_AUTHOR_NAME='test'; export GIT_AUTHOR_NAME
GIT_AUTHOR_EMAIL='test@example.org'; export GIT_AUTHOR_EMAIL
GIT_AUTHOR_DATE="2007-01-01 00:00:00 +0000"; export GIT_AUTHOR_DATE
GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"; export GIT_COMMITTER_NAME
GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"; export GIT_COMMITTER_EMAIL
GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"; export GIT_COMMITTER_DATE
count=10
commit()
{
GIT_AUTHOR_DATE="2007-01-01 00:00:$count +0000"
GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
git commit "$@" >/dev/null 2>/dev/null || echo "git commit error"
count=`expr $count + 1`
}
mkdir git-repo
cd git-repo
git init-db >/dev/null 2>/dev/null
echo a > a
mkdir d
echo b > d/b
git add a d
commit -a -m t1
# Remove the directory, then try to replace it with a file
# (issue 754)
git rm -f d/b
commit -m t2
echo d > d
git add d
commit -m t3
echo b >> a
commit -a -m t4.1
git checkout -b other HEAD^ >/dev/null 2>/dev/null
echo c > a
echo a >> a
commit -a -m t4.2
git checkout master >/dev/null 2>/dev/null
git pull --no-commit . other > /dev/null 2>/dev/null
commit -m 'Merge branch other'
cd ..
hg convert --datesort git-repo
hg -R git-repo-hg tip -v