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https://github.com/git/git
synced 2024-07-16 10:38:05 +00:00
4d4e49fff1
When a commit is parsed, it pretends to have a different (possibly empty) list of parents if there is graft information for that commit. But there is a bug that could occur when a commit is parsed, the graft information is updated (for example, when a shallow file is rewritten), and the same commit is subsequently used: the parents of the commit do not conform to the updated graft information, but the information at the time of parsing. This is usually not an issue, as a commit is usually introduced into the repository at the same time as its graft information. That means that when we try to parse that commit, we already have its graft information. But it is an issue when fetching a shallow point directly into a repository with submodules. The function assign_shallow_commits_to_refs() parses all sought objects (including the shallow point, which we are directly fetching). In update_shallow() in fetch-pack.c, assign_shallow_commits_to_refs() is called before commit_shallow_file(), which means that the shallow point would have been parsed before graft information is updated. Once a commit is parsed, it is no longer sensitive to any graft information updates. This parsed commit is subsequently used when we do a revision walk to search for submodules to fetch, meaning that the commit is considered to have parents even though it is a shallow point (and therefore should be treated as having no parents). Therefore, whenever graft information is updated, mark the commits that were previously grafts and the commits that are newly grafts as unparsed. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
297 lines
8.3 KiB
Bash
Executable file
297 lines
8.3 KiB
Bash
Executable file
#!/bin/sh
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test_description='fetch/clone from a shallow clone'
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GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
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export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
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. ./test-lib.sh
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commit() {
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echo "$1" >tracked &&
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git add tracked &&
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git commit -m "$1"
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}
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test_expect_success 'setup' '
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commit 1 &&
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commit 2 &&
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commit 3 &&
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commit 4 &&
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git config --global transfer.fsckObjects true &&
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test_oid_cache <<-\EOF
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perl sha1:s/0034shallow %s/0036unshallow %s/
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perl sha256:s/004cshallow %s/004eunshallow %s/
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EOF
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'
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test_expect_success 'setup shallow clone' '
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git clone --no-local --depth=2 .git shallow &&
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git --git-dir=shallow/.git log --format=%s >actual &&
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test_write_lines 4 3 >expect &&
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test_cmp expect actual
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'
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test_expect_success 'clone from shallow clone' '
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git clone --no-local shallow shallow2 &&
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(
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cd shallow2 &&
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git fsck &&
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git log --format=%s >actual &&
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test_write_lines 4 3 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch from shallow clone' '
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(
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cd shallow &&
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commit 5
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) &&
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(
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cd shallow2 &&
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git fetch &&
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git fsck &&
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git log --format=%s origin/main >actual &&
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test_write_lines 5 4 3 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch --depth from shallow clone' '
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(
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cd shallow &&
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commit 6
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) &&
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(
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cd shallow2 &&
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git fetch --depth=2 &&
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git fsck &&
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git log --format=%s origin/main >actual &&
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test_write_lines 6 5 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch --unshallow from shallow clone' '
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(
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cd shallow2 &&
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git fetch --unshallow &&
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git fsck &&
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git log --format=%s origin/main >actual &&
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test_write_lines 6 5 4 3 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch --unshallow from a full clone' '
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git clone --no-local --depth=2 .git shallow3 &&
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(
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cd shallow3 &&
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git log --format=%s >actual &&
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test_write_lines 4 3 >expect &&
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test_cmp expect actual &&
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git -c fetch.writeCommitGraph fetch --unshallow &&
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git log origin/main --format=%s >actual &&
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test_write_lines 4 3 2 1 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch something upstream has but hidden by clients shallow boundaries' '
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# the blob "1" is available in .git but hidden by the
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# shallow2/.git/shallow and it should be resent
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! git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) >/dev/null &&
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echo 1 >1.t &&
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git add 1.t &&
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git commit -m add-1-back &&
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(
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cd shallow2 &&
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git fetch ../.git +refs/heads/main:refs/remotes/top/main &&
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git fsck &&
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git log --format=%s top/main >actual &&
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test_write_lines add-1-back 4 3 >expect &&
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test_cmp expect actual
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) &&
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git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) >/dev/null
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'
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test_expect_success 'fetch that requires changes in .git/shallow is filtered' '
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(
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cd shallow &&
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git checkout --orphan no-shallow &&
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commit no-shallow
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) &&
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git init notshallow &&
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(
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cd notshallow &&
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git fetch ../shallow/.git refs/heads/*:refs/remotes/shallow/* &&
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git for-each-ref --format="%(refname)" >actual.refs &&
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echo refs/remotes/shallow/no-shallow >expect.refs &&
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test_cmp expect.refs actual.refs &&
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git log --format=%s shallow/no-shallow >actual &&
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echo no-shallow >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch --update-shallow' '
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(
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cd shallow &&
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git checkout main &&
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commit 7 &&
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git tag -m foo heavy-tag HEAD^ &&
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git tag light-tag HEAD^:tracked
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) &&
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(
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cd notshallow &&
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git fetch --update-shallow ../shallow/.git refs/heads/*:refs/remotes/shallow/* &&
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git fsck &&
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git for-each-ref --sort=refname --format="%(refname)" >actual.refs &&
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cat <<-\EOF >expect.refs &&
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refs/remotes/shallow/main
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refs/remotes/shallow/no-shallow
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refs/tags/heavy-tag
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refs/tags/light-tag
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EOF
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test_cmp expect.refs actual.refs &&
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git log --format=%s shallow/main >actual &&
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test_write_lines 7 6 5 4 3 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success 'fetch --update-shallow into a repo with submodules' '
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git init a-submodule &&
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test_commit -C a-submodule foo &&
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test_when_finished "rm -rf repo-with-sub" &&
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git init repo-with-sub &&
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git -C repo-with-sub submodule add ../a-submodule a-submodule &&
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git -C repo-with-sub commit -m "added submodule" &&
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git -C repo-with-sub fetch --update-shallow ../shallow/.git refs/heads/*:refs/remotes/shallow/*
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'
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test_expect_success 'fetch --update-shallow a commit that is also a shallow point into a repo with submodules' '
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test_when_finished "rm -rf repo-with-sub" &&
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git init repo-with-sub &&
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git -C repo-with-sub submodule add ../a-submodule a-submodule &&
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git -C repo-with-sub commit -m "added submodule" &&
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SHALLOW=$(cat shallow/.git/shallow) &&
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git -C repo-with-sub fetch --update-shallow ../shallow/.git "$SHALLOW":refs/heads/a-shallow
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'
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test_expect_success 'fetch --update-shallow (with fetch.writeCommitGraph)' '
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(
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cd shallow &&
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git checkout main &&
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commit 8 &&
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git tag -m foo heavy-tag-for-graph HEAD^ &&
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git tag light-tag-for-graph HEAD^:tracked
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) &&
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test_config -C notshallow fetch.writeCommitGraph true &&
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(
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cd notshallow &&
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git fetch --update-shallow ../shallow/.git refs/heads/*:refs/remotes/shallow/* &&
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git fsck &&
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git for-each-ref --sort=refname --format="%(refname)" >actual.refs &&
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cat <<-EOF >expect.refs &&
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refs/remotes/shallow/main
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refs/remotes/shallow/no-shallow
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refs/tags/heavy-tag
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refs/tags/heavy-tag-for-graph
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refs/tags/light-tag
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refs/tags/light-tag-for-graph
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EOF
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test_cmp expect.refs actual.refs &&
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git log --format=%s shallow/main >actual &&
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test_write_lines 8 7 6 5 4 3 >expect &&
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test_cmp expect actual
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)
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'
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test_expect_success POSIXPERM,SANITY 'shallow fetch from a read-only repo' '
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cp -R .git read-only.git &&
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test_when_finished "find read-only.git -type d -print | xargs chmod +w" &&
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find read-only.git -print | xargs chmod -w &&
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git clone --no-local --depth=2 read-only.git from-read-only &&
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git --git-dir=from-read-only/.git log --format=%s >actual &&
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test_write_lines add-1-back 4 >expect &&
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test_cmp expect actual
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'
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test_expect_success '.git/shallow is edited by repack' '
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git init shallow-server &&
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test_commit -C shallow-server A &&
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test_commit -C shallow-server B &&
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git -C shallow-server checkout -b branch &&
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test_commit -C shallow-server C &&
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test_commit -C shallow-server E &&
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test_commit -C shallow-server D &&
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d="$(git -C shallow-server rev-parse --verify D^0)" &&
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git -C shallow-server checkout main &&
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git clone --depth=1 --no-tags --no-single-branch \
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"file://$PWD/shallow-server" shallow-client &&
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: now remove the branch and fetch with prune &&
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git -C shallow-server branch -D branch &&
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git -C shallow-client fetch --prune --depth=1 \
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origin "+refs/heads/*:refs/remotes/origin/*" &&
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git -C shallow-client repack -adfl &&
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test_must_fail git -C shallow-client rev-parse --verify $d^0 &&
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! grep $d shallow-client/.git/shallow &&
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git -C shallow-server branch branch-orig $d &&
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git -C shallow-client fetch --prune --depth=2 \
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origin "+refs/heads/*:refs/remotes/origin/*"
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'
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. "$TEST_DIRECTORY"/lib-httpd.sh
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start_httpd
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REPO="$HTTPD_DOCUMENT_ROOT_PATH/repo"
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test_expect_success 'shallow fetches check connectivity before writing shallow file' '
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rm -rf "$REPO" client &&
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git init "$REPO" &&
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test_commit -C "$REPO" one &&
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test_commit -C "$REPO" two &&
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test_commit -C "$REPO" three &&
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git init client &&
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# Use protocol v2 to ensure that shallow information is sent exactly
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# once by the server, since we are planning to manipulate it.
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git -C "$REPO" config protocol.version 2 &&
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git -C client config protocol.version 2 &&
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git -C client fetch --depth=2 "$HTTPD_URL/one_time_perl/repo" main:a_branch &&
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# Craft a situation in which the server sends back an unshallow request
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# with an empty packfile. This is done by refetching with a shorter
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# depth (to ensure that the packfile is empty), and overwriting the
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# shallow line in the response with the unshallow line we want.
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printf "$(test_oid perl)" \
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"$(git -C "$REPO" rev-parse HEAD)" \
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"$(git -C "$REPO" rev-parse HEAD^)" \
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>"$HTTPD_ROOT_PATH/one-time-perl" &&
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test_must_fail env GIT_TEST_SIDEBAND_ALL=0 git -C client \
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fetch --depth=1 "$HTTPD_URL/one_time_perl/repo" \
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main:a_branch &&
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# Ensure that the one-time-perl script was used.
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! test -e "$HTTPD_ROOT_PATH/one-time-perl" &&
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# Ensure that the resulting repo is consistent, despite our failure to
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# fetch.
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git -C client fsck
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'
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# DO NOT add non-httpd-specific tests here, because the last part of this
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# test script is only executed when httpd is available and enabled.
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test_done
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