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2007-08-01git-clone: aggressively optimize local clone behaviour.Libravatar Junio C Hamano1-1/+1
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>
2007-02-04git-clone --reference: saner handling of borrowed symrefs.Libravatar Junio C Hamano1-1/+39
When using --reference to borrow objects from a neighbouring repository while cloning, we copy the entire set of refs under temporary "refs/reference-tmp/refs" space and set up the object alternates. However, a textual symref copied this way would not point at the right place, and causes later steps to emit error messages (which is harmless but still alarming). This is most visible when using a clone created with the separate-remote layout as a reference, because such a repository would have refs/remotes/origin/HEAD with 'ref: refs/remotes/origin/master' as its contents. Although we do not create symbolic-link based refs anymore, they have the same problem because they are always supposed to be relative to refs/ hierarchy (we dereference by hand, so it only is good for HEAD and nothing else). In either case, the solution is simply to remove them after copying under refs/reference-tmp; if a symref points at a true ref, that true ref itself is enough to ensure that objects reachable from it do not needlessly get fetched. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-21Revert "prune: --grace=time"Libravatar Junio C Hamano1-2/+2
This reverts commit 9b088c4e394df84232cfd37aea78349a495b09c1. Protecting 'mature' objects does not make it any safer. We should admit that git-prune is inherently unsafe when run in parallel with other operations without involving unwarranted locking overhead, and with the latest git, even rebase and reset would not immediately create crufts anyway.
2007-01-20prune: --grace=timeLibravatar Matthias Lederhofer1-2/+2
This option gives grace period to objects that are unreachable from the refs from getting pruned. The default value is 24 hours and may be changed using gc.prunegrace. Signed-off-by: Matthias Lederhofer <matled@gmx.net> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-07-10Fix more typos, primarily in the codeLibravatar Pavel Roskin1-1/+1
The only visible change is that git-blame doesn't understand "--compability" anymore, but it does accept "--compatibility" instead, which is already documented. Signed-off-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-07clone: keep --reference even with -l -sLibravatar Martin Waitz1-0/+78
Both -l -s and --reference update objects/info/alternates and used to write over each other. Signed-off-by: Martin Waitz <tali@admingilde.org> Signed-off-by: Junio C Hamano <junkio@cox.net>