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Viewing changes to doc/developers/gc.txt

  • Committer: Vincent Ladeuil
  • Date: 2008-08-26 08:25:27 UTC
  • mto: (3668.1.1 trunk) (3703.1.1 trunk)
  • mto: This revision was merged to the branch mainline in revision 3669.
  • Revision ID: v.ladeuil+lp@free.fr-20080826082527-109yyxzc0u24oeel
Fix all calls to tempfile.mkdtemp to osutils.mkdtemp.

* bzrlib/transform.py:
(TransformPreview.__init__): Use osutils.mkdtemp instead of
tempfile.mkdtemp.

* bzrlib/tests/test_whitebox.py:
(MoreTests.test_relpath): Use osutils.mkdtemp instead of
tempfile.mkdtemp.

* bzrlib/tests/test_setup.py:
(TestSetup.test_build_and_install): Use osutils.mkdtemp instead of
tempfile.mkdtemp.

* bzrlib/tests/test_bundle.py:
(BundleTester.get_checkout): Use osutils.mkdtemp instead of
tempfile.mkdtemp.

* bzrlib/tests/blackbox/test_outside_wt.py:
(TestOutsideWT.test_cwd_log,
TestOutsideWT.test_diff_outside_tree): Use osutils.mkdtemp instead
of tempfile.mkdtemp.

* bzrlib/smart/repository.py:
(SmartServerRepositoryTarball._copy_to_tempdir): Use
osutils.mkdtemp instead of tempfile.mkdtemp.
(SmartServerRepositoryTarball._tarfile_response): Line too long.

* bzrlib/remote.py:
(RemoteRepository._copy_repository_tarball): Use osutils.mkdtemp
instead of tempfile.mkdtemp.

* bzrlib/osutils.py:
(_mac_mkdtemp): Add docstring.

* bzrlib/mail_client.py:
(ExternalMailClient.compose): Use osutils.mkdtemp instead of
tempfile.mkdtemp.

* bzrlib/diff.py:
(DiffFromTool.__init__): Use osutils.mkdtemp instead of
tempfile.mkdtemp.

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Lines of Context:
doc/developers/gc.txt
 
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Garbage Collection
 
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==================
 
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Garbage collection is used to remove data from a repository that is no longer referenced.
 
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Generally this involves locking the repository and scanning all its branches
 
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then generating a new repository with less data.
 
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Least work we can hope to perform
 
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---------------------------------
 
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* Read all branches to get initial references - tips + tags.
 
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* Read through the revision graph to find unreferenced revisions. A cheap HEADS
 
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  list might help here by allowing comparison of the initial references to the
 
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  HEADS - any unreferenced head is garbage.
 
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* Walk out via inventory deltas to get the full set of texts and signatures to preserve.
 
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* Copy to a new repository
 
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* Bait and switch back to the original
 
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* Remove the old repository.
 
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A possibility to reduce this would be to have a set of grouped 'known garbage
 
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free' data - 'ancient history' which can be preserved in total should its HEADS
 
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be fully referenced - and where the HEADS list is deliberate cheap (e.g. at the
 
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top of some index).
 
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possibly - null data in place without saving size.