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authorJunio C Hamano <gitster@pobox.com>2007-08-02 06:42:36 (GMT)
committerJunio C Hamano <gitster@pobox.com>2007-08-02 06:42:36 (GMT)
commit3d5c418ff56645e13bdbd8c9f7d84fdaf7c8494b (patch)
tree1f1a596ee7b69399e2b233d20c7770639e6150e0 /Documentation/urls.txt
parent72a4f4b657846af6c65360d92aa09d8b7f3dfbb0 (diff)
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git-clone: aggressively optimize local clone behaviour.
This changes the behaviour of cloning from a repository on the local machine, by defaulting to "-l" (use hardlinks to share files under .git/objects) and making "-l" a no-op. A new option, --no-hardlinks, is also added to cause file-level copy of files under .git/objects while still avoiding the normal "pack to pipe, then receive and index pack" network transfer overhead. The old behaviour of local cloning without -l nor -s is availble by specifying the source repository with the newly introduced file:///path/to/repo.git/ syntax (i.e. "same as network" cloning). * With --no-hardlinks (i.e. have all .git/objects/ copied via cpio) would not catch the source repository corruption, and also risks corrupted recipient repository if an alpha-particle hits memory cell while indexing and resolving deltas. As long as the recipient is created uncorrupted, you have a good back-up. * same-as-network is expensive, but it would catch the breakage of the source repository. It still risks corrupted recipient repository due to hardware failure. As long as the recipient is created uncorrupted, you have a good back-up. * The new default on the same filesystem, as long as the source repository is healthy, it is very likely that the recipient would be, too. Also it is very cheap. You do not get any back-up benefit, though. None of the method is resilient against the source repository corruption, so let's discount that from the comparison. Then the difference with and without --no-hardlinks matters primarily if you value the back-up benefit or not. If you want to use the cloned repository as a back-up, then it is cheaper to do a clone with --no-hardlinks and two git-fsck (source before clone, recipient after clone) than same-as-network clone, especially as you are likely to do a git-fsck on the recipient if you are so paranoid anyway. Which leads me to believe that being able to use file:/// is probably a good idea, if only for testability, but probably of little practical value. We default to hardlinked clone for everyday use, and paranoids can use --no-hardlinks as a way to make a back-up. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation/urls.txt')
-rw-r--r--Documentation/urls.txt16
1 files changed, 10 insertions, 6 deletions
diff --git a/Documentation/urls.txt b/Documentation/urls.txt
index 781df41..b38145f 100644
--- a/Documentation/urls.txt
+++ b/Documentation/urls.txt
@@ -15,11 +15,11 @@ to name the remote repository:
- ssh://{startsb}user@{endsb}host.xz/~/path/to/repo.git
===============================================================
-SSH is the default transport protocol. You can optionally specify
-which user to log-in as, and an alternate, scp-like syntax is also
-supported. Both syntaxes support username expansion,
-as does the native git protocol. The following three are
-identical to the last three above, respectively:
+SSH is the default transport protocol over the network. You can
+optionally specify which user to log-in as, and an alternate,
+scp-like syntax is also supported. Both syntaxes support
+username expansion, as does the native git protocol. The following
+three are identical to the last three above, respectively:
===============================================================
- {startsb}user@{endsb}host.xz:/path/to/repo.git/
@@ -27,8 +27,12 @@ identical to the last three above, respectively:
- {startsb}user@{endsb}host.xz:path/to/repo.git
===============================================================
-To sync with a local directory, use:
+To sync with a local directory, you can use:
===============================================================
- /path/to/repo.git/
+- file:///path/to/repo.git/
===============================================================
+
+They are mostly equivalent, except when cloning. See
+gitlink:git-clone[1] for details.