tests/test-backout

convert: readd --filemap

To handle merges correctly, this revision adds a filemap_source class
that wraps a converter_source and does the work necessary to calculate
the subgraph we're interested in.

The wrapped converter_source must provide a new getchangedfiles method
that, given a revision rev, and an index N, returns the list of files
that are different in rev and its Nth parent.

The implementation depends on the ability to skip some revisions and to
change the parents field of the commit objects that we returned earlier.

To make the conversion restartable, we assume the revisons in the
revmapfile are topologically sorted.

#!/bin/sh

HGMERGE=true; export HGMERGE

hg init basic
cd basic

echo '# should complain'
hg backout
hg backout -r 0 0

echo '# basic operation'
echo a > a
hg commit -d '0 0' -A -m a
echo b >> a
hg commit -d '1 0' -m b

hg backout -d '2 0' tip
cat a

echo '# file that was removed is recreated'
cd ..
hg init remove
cd remove

echo content > a
hg commit -d '0 0' -A -m a

hg rm a
hg commit -d '1 0' -m b

hg backout -d '2 0' --merge tip
cat a

echo '# backout of backout is as if nothing happened'

hg backout -d '3 0' --merge tip
cat a 2>/dev/null || echo cat: a: No such file or directory

echo '# backout with merge'
cd ..
hg init merge
cd merge

echo line 1 > a
hg commit -d '0 0' -A -m a

echo line 2 >> a
hg commit -d '1 0' -m b

echo line 3 >> a
hg commit -d '2 0' -m c

hg backout --merge -d '3 0' 1
hg commit -d '4 0' -m d
cat a

echo '# backout should not back out subsequent changesets'
hg init onecs
cd onecs
echo 1 > a
hg commit -d '0 0' -A -m a
echo 2 >> a
hg commit -d '1 0' -m b
echo 1 > b
hg commit -d '2 0' -A -m c
hg backout -d '3 0' 1
hg locate b

cd ..
hg init m
cd m
echo a > a
hg commit -d '0 0' -A -m a
echo b > b
hg commit -d '1 0' -A -m b
echo c > c
hg commit -d '2 0' -A -m b
hg update 1
echo d > d
hg commit -d '3 0' -A -m c
hg merge 2
hg commit -d '4 0' -A -m d

echo '# backout of merge should fail'

hg backout 4

echo '# backout of merge with bad parent should fail'

hg backout --parent 0 4

echo '# backout of non-merge with parent should fail'

hg backout --parent 0 3

echo '# backout with valid parent should be ok'

hg backout -d '5 0' --parent 2 4

hg rollback
hg update -C

hg backout -d '6 0' --parent 3 4

exit 0