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
HGMERGE=true; export HGMERGE
echo % init
hg init
echo % commit
echo 'a' > a
hg ci -A -m test -u nobody -d '1 0'
echo % annotate -c
hg annotate -c a
echo % annotate -cl
hg annotate -cl a
echo % annotate -d
hg annotate -d a
echo % annotate -n
hg annotate -n a
echo % annotate -nl
hg annotate -nl a
echo % annotate -u
hg annotate -u a
echo % annotate -cdnu
hg annotate -cdnu a
echo % annotate -cdnul
hg annotate -cdnul a
cat <<EOF >>a
a
a
EOF
hg ci -ma1 -d '1 0'
hg cp a b
hg ci -mb -d '1 0'
cat <<EOF >> b
b4
b5
b6
EOF
hg ci -mb2 -d '2 0'
echo % annotate -n b
hg annotate -n b
echo % annotate -nl b
hg annotate -nl b
echo % annotate -nf b
hg annotate -nf b
echo % annotate -nlf b
hg annotate -nlf b
hg up -C 2
cat <<EOF >> b
b4
c
b5
EOF
hg ci -mb2.1 -d '2 0'
hg merge
hg ci -mmergeb -d '3 0'
echo % annotate after merge
hg annotate -nf b
echo % annotate after merge with -l
hg annotate -nlf b
hg up -C 1
hg cp a b
cat <<EOF > b
a
z
a
EOF
hg ci -mc -d '3 0'
hg merge
cat <<EOF >> b
b4
c
b5
EOF
echo d >> b
hg ci -mmerge2 -d '4 0'
echo % annotate after rename merge
hg annotate -nf b
echo % annotate after rename merge with -l
hg annotate -nlf b
echo % linkrev vs rev
hg annotate -r tip -n a
echo % linkrev vs rev with -l
hg annotate -r tip -nl a
# test issue 589
# annotate was crashing when trying to --follow something
# like A -> B -> A
echo % generate ABA rename configuration
echo foo > foo
hg add foo
hg ci -m addfoo
hg rename foo bar
hg ci -m renamefoo
hg rename bar foo
hg ci -m renamebar
echo % annotate after ABA with follow
hg annotate --follow foo