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.
adding init
adding x
adding y
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
adding x
adding y
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
requesting all changes
adding changesets
adding manifests
adding file changes
added 4 changesets with 3 changes to 3 files
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
requesting all changes
adding changesets
adding manifests
adding file changes
added 4 changesets with 3 changes to 3 files
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
comparing with b
searching for changes
changeset: 4:fdb3c546e859
tag: tip
parent: 1:1f703b3fcbc6
parent: 2:de997049e034
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: m2
comparing with c
searching for changes
changeset: 3:f40f830c0024
parent: 2:de997049e034
parent: 1:1f703b3fcbc6
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: m1
comparing with c
searching for changes
changeset: 3:f40f830c0024
tag: tip
parent: 2:de997049e034
parent: 1:1f703b3fcbc6
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: m1
comparing with b
searching for changes
changeset: 3:fdb3c546e859
tag: tip
parent: 1:1f703b3fcbc6
parent: 2:de997049e034
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: m2
pulling from a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
pulling from a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)