mirror of
https://github.com/git/git.git
synced 2024-11-06 09:13:01 +01:00
3d5c418ff5
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>
116 lines
2.3 KiB
Bash
Executable file
116 lines
2.3 KiB
Bash
Executable file
#!/bin/sh
|
|
#
|
|
# Copyright (C) 2006 Martin Waitz <tali@admingilde.org>
|
|
#
|
|
|
|
test_description='test clone --reference'
|
|
. ./test-lib.sh
|
|
|
|
base_dir=`pwd`
|
|
|
|
test_expect_success 'preparing first repository' \
|
|
'test_create_repo A && cd A &&
|
|
echo first > file1 &&
|
|
git add file1 &&
|
|
git commit -m initial'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'preparing second repository' \
|
|
'git clone A B && cd B &&
|
|
echo second > file2 &&
|
|
git add file2 &&
|
|
git commit -m addition &&
|
|
git repack -a -d &&
|
|
git prune'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'cloning with reference (-l -s)' \
|
|
'git clone -l -s --reference B A C'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'existence of info/alternates' \
|
|
'test `wc -l <C/.git/objects/info/alternates` = 2'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'pulling from reference' \
|
|
'cd C &&
|
|
git pull ../B'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'that reference gets used' \
|
|
'cd C &&
|
|
echo "0 objects, 0 kilobytes" > expected &&
|
|
git count-objects > current &&
|
|
diff expected current'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'cloning with reference (no -l -s)' \
|
|
'git clone --reference B file://`pwd`/A D'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'existence of info/alternates' \
|
|
'test `wc -l <D/.git/objects/info/alternates` = 1'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'pulling from reference' \
|
|
'cd D && git pull ../B'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'that reference gets used' \
|
|
'cd D && echo "0 objects, 0 kilobytes" > expected &&
|
|
git count-objects > current &&
|
|
diff expected current'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'updating origin' \
|
|
'cd A &&
|
|
echo third > file3 &&
|
|
git add file3 &&
|
|
git commit -m update &&
|
|
git repack -a -d &&
|
|
git prune'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'pulling changes from origin' \
|
|
'cd C &&
|
|
git pull origin'
|
|
|
|
cd "$base_dir"
|
|
|
|
# the 2 local objects are commit and tree from the merge
|
|
test_expect_success 'that alternate to origin gets used' \
|
|
'cd C &&
|
|
echo "2 objects" > expected &&
|
|
git count-objects | cut -d, -f1 > current &&
|
|
diff expected current'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_expect_success 'pulling changes from origin' \
|
|
'cd D &&
|
|
git pull origin'
|
|
|
|
cd "$base_dir"
|
|
|
|
# the 5 local objects are expected; file3 blob, commit in A to add it
|
|
# and its tree, and 2 are our tree and the merge commit.
|
|
test_expect_success 'check objects expected to exist locally' \
|
|
'cd D &&
|
|
echo "5 objects" > expected &&
|
|
git count-objects | cut -d, -f1 > current &&
|
|
diff expected current'
|
|
|
|
cd "$base_dir"
|
|
|
|
test_done
|