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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>
183 lines
4 KiB
Bash
Executable file
183 lines
4 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2005 Johannes Schindelin
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#
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test_description='Testing multi_ack pack fetching
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'
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. ./test-lib.sh
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# Test fetch-pack/upload-pack pair.
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# Some convenience functions
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add () {
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name=$1
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text="$@"
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branch=`echo $name | sed -e 's/^\(.\).*$/\1/'`
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parents=""
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shift
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while test $1; do
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parents="$parents -p $1"
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shift
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done
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echo "$text" > test.txt
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git update-index --add test.txt
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tree=$(git write-tree)
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# make sure timestamps are in correct order
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sec=$(($sec+1))
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commit=$(echo "$text" | GIT_AUTHOR_DATE=$sec \
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git commit-tree $tree $parents 2>>log2.txt)
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export $name=$commit
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echo $commit > .git/refs/heads/$branch
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eval ${branch}TIP=$commit
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}
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count_objects () {
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ls .git/objects/??/* 2>>log2.txt | wc -l | tr -d " "
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}
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test_expect_object_count () {
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message=$1
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count=$2
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output="$(count_objects)"
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test_expect_success \
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"new object count $message" \
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"test $count = $output"
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}
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pull_to_client () {
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number=$1
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heads=$2
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count=$3
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no_strict_count_check=$4
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cd client
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test_expect_success "$number pull" \
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"git-fetch-pack -k -v .. $heads"
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case "$heads" in *A*) echo $ATIP > .git/refs/heads/A;; esac
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case "$heads" in *B*) echo $BTIP > .git/refs/heads/B;; esac
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git symbolic-ref HEAD refs/heads/`echo $heads | sed -e 's/^\(.\).*$/\1/'`
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test_expect_success "fsck" 'git fsck --full > fsck.txt 2>&1'
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test_expect_success 'check downloaded results' \
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'mv .git/objects/pack/pack-* . &&
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p=`ls -1 pack-*.pack` &&
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git unpack-objects <$p &&
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git fsck --full'
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test_expect_success "new object count after $number pull" \
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'idx=`echo pack-*.idx` &&
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pack_count=`git show-index <$idx | wc -l` &&
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test $pack_count = $count'
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test -z "$pack_count" && pack_count=0
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if [ -z "$no_strict_count_check" ]; then
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test_expect_success "minimal count" "test $count = $pack_count"
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else
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test $count != $pack_count && \
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echo "WARNING: $pack_count objects transmitted, only $count of which were needed"
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fi
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rm -f pack-*
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cd ..
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}
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# Here begins the actual testing
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# A1 - ... - A20 - A21
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# \
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# B1 - B2 - .. - B70
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# client pulls A20, B1. Then tracks only B. Then pulls A.
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(
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mkdir client &&
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cd client &&
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git init 2>> log2.txt &&
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git config transfer.unpacklimit 0
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)
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add A1
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prev=1; cur=2; while [ $cur -le 10 ]; do
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add A$cur $(eval echo \$A$prev)
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prev=$cur
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cur=$(($cur+1))
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done
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add B1 $A1
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echo $ATIP > .git/refs/heads/A
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echo $BTIP > .git/refs/heads/B
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git symbolic-ref HEAD refs/heads/B
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pull_to_client 1st "B A" $((11*3))
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add A11 $A10
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prev=1; cur=2; while [ $cur -le 65 ]; do
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add B$cur $(eval echo \$B$prev)
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prev=$cur
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cur=$(($cur+1))
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done
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pull_to_client 2nd "B" $((64*3))
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pull_to_client 3rd "A" $((1*3)) # old fails
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test_expect_success "clone shallow" "git-clone --depth 2 file://`pwd`/. shallow"
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(cd shallow; git count-objects -v) > count.shallow
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test_expect_success "clone shallow object count" \
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"test \"in-pack: 18\" = \"$(grep in-pack count.shallow)\""
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count_output () {
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sed -e '/^in-pack:/d' -e '/^packs:/d' -e '/: 0$/d' "$1"
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}
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test_expect_success "clone shallow object count (part 2)" '
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test -z "$(count_output count.shallow)"
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'
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test_expect_success "fsck in shallow repo" \
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"(cd shallow; git fsck --full)"
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#test_done; exit
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add B66 $B65
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add B67 $B66
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test_expect_success "pull in shallow repo" \
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"(cd shallow; git pull .. B)"
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(cd shallow; git count-objects -v) > count.shallow
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test_expect_success "clone shallow object count" \
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"test \"count: 6\" = \"$(grep count count.shallow)\""
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add B68 $B67
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add B69 $B68
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test_expect_success "deepening pull in shallow repo" \
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"(cd shallow; git pull --depth 4 .. B)"
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(cd shallow; git count-objects -v) > count.shallow
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test_expect_success "clone shallow object count" \
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"test \"count: 12\" = \"$(grep count count.shallow)\""
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test_expect_success "deepening fetch in shallow repo" \
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"(cd shallow; git fetch --depth 4 .. A:A)"
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(cd shallow; git count-objects -v) > count.shallow
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test_expect_success "clone shallow object count" \
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"test \"count: 18\" = \"$(grep count count.shallow)\""
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test_expect_failure "pull in shallow repo with missing merge base" \
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"(cd shallow; git pull --depth 4 .. A)"
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test_done
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