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.
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
Main should be gone
a
changeset: 3:ded32b0db104
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Added side2
changeset: 2:92a816cea698
parent: 0:537353581d3d
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Added side1
changeset: 1:221226fb2bd8
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Added main
changeset: 0:537353581d3d
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Added a
Should have two heads, side2 and main
changeset: 3:ded32b0db104
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Added side2
changeset: 1:221226fb2bd8
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Added main
Should show a side1 side2
a
side1
side2
resolving manifests
overwrite True partial False
ancestor 537353581d3d local ded32b0db104+ remote 221226fb2bd8
side2: remote deleted -> r
side1: remote deleted -> r
main: remote created -> g
getting main
removing side1
removing side2
1 files updated, 0 files merged, 2 files removed, 0 files unresolved
Should only show a main
a
main