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.
hg status in repo root:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status . in repo root:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status in a:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status . in a:
? 1/in_a_1
? in_a
hg status .. in a:
? 1/in_a_1
? in_a
? ../b/1/in_b_1
? ../b/2/in_b_2
? ../b/in_b
? ../in_root
hg status in b:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status . in b:
? 1/in_b_1
? 2/in_b_2
? in_b
hg status .. in b:
? ../a/1/in_a_1
? ../a/in_a
? 1/in_b_1
? 2/in_b_2
? in_b
? ../in_root
hg status in a/1:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status . in a/1:
? in_a_1
hg status .. in a/1:
? in_a_1
? ../in_a
hg status in b/1:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status . in b/1:
? in_b_1
hg status .. in b/1:
? in_b_1
? ../2/in_b_2
? ../in_b
hg status in b/2:
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
hg status . in b/2:
? in_b_2
hg status .. in b/2:
? ../1/in_b_1
? in_b_2
? ../in_b
adding .hgignore
adding deleted
adding modified
adding removed
hg status:
A added
R removed
! deleted
? unknown
hg status modified added removed deleted unknown never-existed ignored:
never-existed: No such file or directory
A added
R removed
! deleted
? ignored
? unknown
hg status -C:
A added
A copied
modified
R removed
! deleted
? unknown
hg status -A:
A added
A copied
modified
R removed
! deleted
? unknown
I ignored
C .hgignore
C modified