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
echo "[ui]" >> $HGRCPATH
echo "interactive=true" >> $HGRCPATH
echo "[extensions]" >> $HGRCPATH
echo "record=" >> $HGRCPATH
echo % help
hg help record
hg init a
cd a
echo % select no files
touch empty-rw
hg add empty-rw
hg record empty-rw<<EOF
n
EOF
echo; hg tip -p
echo % select files but no hunks
hg record empty-rw<<EOF
y
n
EOF
echo; hg tip -p
echo % record empty file
hg record -d '0 0' -m empty empty-rw<<EOF
y
y
EOF
echo; hg tip -p
echo % rename empty file
hg mv empty-rw empty-rename
hg record -d '1 0' -m rename<<EOF
y
EOF
echo; hg tip -p
echo % copy empty file
hg cp empty-rename empty-copy
hg record -d '2 0' -m copy<<EOF
y
EOF
echo; hg tip -p
echo % delete empty file
hg rm empty-copy
hg record -d '3 0' -m delete<<EOF
y
EOF
echo; hg tip -p
echo % add binary file
hg bundle --base -2 tip.bundle
hg add tip.bundle
hg record -d '4 0' -m binary<<EOF
y
EOF
echo; hg tip -p
echo % change binary file
hg bundle --base -2 tip.bundle
hg record -d '5 0' -m binary-change<<EOF
y
EOF
echo; hg tip -p
echo % rename and change binary file
hg mv tip.bundle top.bundle
hg bundle --base -2 top.bundle
hg record -d '6 0' -m binary-change-rename<<EOF
y
EOF
echo; hg tip -p
echo % add plain file
for i in 1 2 3 4 5 6 7 8 9 10; do
echo $i >> plain
done
hg add plain
hg record -d '7 0' -m plain plain<<EOF
y
y
EOF
echo; hg tip -p
echo % modify end of plain file
echo 11 >> plain
hg record -d '8 0' -m end plain <<EOF
y
y
EOF
echo % modify end of plain file, no EOL
hg tip --template '{node}' >> plain
hg record -d '9 0' -m noeol plain <<EOF
y
y
EOF
echo % modify end of plain file, add EOL
echo >> plain
hg record -d '10 0' -m eol plain <<EOF
y
y
y
EOF
echo % modify beginning, trim end, record both
rm plain
for i in 2 2 3 4 5 6 7 8 9 10; do
echo $i >> plain
done
hg record -d '10 0' -m begin-and-end plain <<EOF
y
y
y
EOF
echo; hg tip -p
echo % trim beginning, modify end
rm plain
for i in 4 5 6 7 8 9 10.new; do
echo $i >> plain
done
echo % record end
hg record -d '11 0' -m end-only plain <<EOF
y
n
y
EOF
echo; hg tip -p
echo % record beginning
hg record -d '12 0' -m begin-only plain <<EOF
y
y
EOF
echo; hg tip -p
echo % add to beginning, trim from end
rm plain
for i in 1 2 3 4 5 6 7 8 9; do
echo $i >> plain
done
echo % record end
hg record --traceback -d '13 0' -m end-again plain<<EOF
y
n
y
EOF
echo % add to beginning, middle, end
rm plain
for i in 1 2 3 4 5 5.new 5.reallynew 6 7 8 9 10 11; do
echo $i >> plain
done
echo % record beginning, middle
hg record -d '14 0' -m middle-only plain <<EOF
y
y
y
n
EOF
echo; hg tip -p
echo % record end
hg record -d '15 0' -m end-only plain <<EOF
y
y
EOF
echo; hg tip -p
mkdir subdir
cd subdir
echo a > a
hg ci -d '16 0' -Amsubdir
echo a >> a
hg record -d '16 0' -m subdir-change a <<EOF
y
y
EOF
echo; hg tip -p
echo a > f1
echo b > f2
hg add f1 f2
hg ci -mz -d '17 0'
echo a >> f1
echo b >> f2
echo % help, quit
hg record <<EOF
?
q
EOF
echo % skip
hg record <<EOF
s
EOF
echo % no
hg record <<EOF
n
EOF
echo % f, quit
hg record <<EOF
f
q
EOF
echo % s, all
hg record -d '18 0' -mx <<EOF
s
a
EOF
echo; hg tip -p
echo % f
hg record -d '19 0' -my <<EOF
f
EOF
echo; hg tip -p