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.
marked working directory as branch foo
foo
marked working directory as branch bar
% branch shadowing
abort: a branch of the same name already exists (use --force to override)
marked working directory as branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
foo
changeset: 5:5f8fb06e083e
branch: foo
tag: tip
parent: 4:4909a3732169
parent: 3:bf1bc2f45e83
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: merge
changeset: 4:4909a3732169
branch: foo
parent: 1:b699b1cec9c2
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: modify a branch
changeset: 3:bf1bc2f45e83
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: clear branch name
changeset: 2:67ec16bde7f1
branch: bar
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: change branch name
changeset: 1:b699b1cec9c2
branch: foo
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: add branch name
changeset: 0:be8523e69bf8
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: initial
foo 5:5f8fb06e083e
default 3:bf1bc2f45e83 (inactive)
bar 2:67ec16bde7f1 (inactive)
foo
default
bar
% test for invalid branch cache
rolling back last transaction
changeset: 4:4909a3732169
branch: foo
tag: tip
parent: 1:b699b1cec9c2
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: modify a branch
Invalid branch cache: unknown tip
changeset: 4:4909a3732169c0c20011c4f4b8fdff4e3d89b23f
branch: foo
tag: tip
parent: 1:b699b1cec9c2966b3700de4fef0dc123cd754c31
parent: -1:0000000000000000000000000000000000000000
manifest: 4:d01b250baaa05909152f7ae07d7a649deea0df9a
user: test
date: Mon Jan 12 13:46:40 1970 +0000
files: a
extra: branch=foo
description:
modify a branch
4:4909a3732169
4909a3732169c0c20011c4f4b8fdff4e3d89b23f 4
bf1bc2f45e834c75404d0ddab57d53beab56e2f8 default
4909a3732169c0c20011c4f4b8fdff4e3d89b23f foo
67ec16bde7f1575d523313b9bca000f6a6f12dca bar
% update with no arguments: tipmost revision of the current branch
bf1bc2f45e83
4909a3732169 (foo) tip
marked working directory as branch foobar
abort: branch foobar not found
% fastforward merge
marked working directory as branch ff
adding ff
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
foo
changeset: 6:f0c74f92a385
branch: foo
tag: tip
parent: 4:4909a3732169
parent: 5:c420d2121b71
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Merge ff into foo
a
ff