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https://github.com/git/git.git
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06f3867865
When opening a MIDX bitmap, we the pack-bitmap machinery eagerly calls `prepare_midx_pack()` on each of the packs contained in the MIDX. This is done in order to populate the array of `struct packed_git *`s held by the MIDX, which we need later on in `load_reverse_index()`, since it calls `load_pack_revindex()` on each of the MIDX'd packs, and requires that the caller provide a pointer to a `struct packed_git`. When opening one of these packs fails, the pack-bitmap code will `die()` indicating that it can't open one of the packs in the MIDX. This indicates that the MIDX is somehow broken with respect to the current state of the repository. When this is the case, we indeed cannot make use of the MIDX bitmap to speed up reachability traversals. However, it does not mean that we can't perform reachability traversals at all. In other failure modes, that same function calls `warning()` and then returns -1, indicating to its caller (`open_bitmap()`) that we should either look for a pack bitmap if one is available, or perform normal object traversal without using bitmaps at all. There is no reason why this case should cause us to die. If we instead continued (by jumping to `cleanup` as this patch does) and avoid using bitmaps altogether, we may again try and query the MIDX, which will also fail. But when trying to call `fill_midx_entry()` fails, it also returns a signal of its failure, and prompts the caller to try and locate the object elsewhere. In other words, the normal object traversal machinery works fine in the presence of a corrupt MIDX, so there is no reason that the MIDX bitmap machinery should abort in that case when we could easily continue. Note that we *could* in theory try again to load a MIDX bitmap after calling `reprepare_packed_git()`. Even though the `prepare_packed_git()` code is careful to avoid adding a pack that we already have, `prepare_midx_pack()` is not. So if we got part of the way through calling `prepare_midx_pack()` on a stale MIDX, and then tried again on a fresh MIDX that contains some of the same packs, we would end up with a loop through the `->next` pointer. For now, let's do the simplest thing possible and fallback to the non-bitmap code when we detect a stale MIDX so that the complete fix as above can be implemented carefully. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
517 lines
13 KiB
Bash
Executable File
517 lines
13 KiB
Bash
Executable File
#!/bin/sh
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test_description='exercise basic multi-pack bitmap functionality'
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. ./test-lib.sh
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. "${TEST_DIRECTORY}/lib-bitmap.sh"
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# We'll be writing our own midx and bitmaps, so avoid getting confused by the
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# automatic ones.
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GIT_TEST_MULTI_PACK_INDEX=0
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GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
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# This test exercise multi-pack bitmap functionality where the object order is
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# stored and read from a special chunk within the MIDX, so use the default
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# behavior here.
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sane_unset GIT_TEST_MIDX_WRITE_REV
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sane_unset GIT_TEST_MIDX_READ_RIDX
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bitmap_reuse_tests() {
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from=$1
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to=$2
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writeLookupTable=false
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for i in $3-${$#}
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do
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case $i in
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"pack.writeBitmapLookupTable") writeLookupTable=true;;
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esac
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done
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test_expect_success "setup pack reuse tests ($from -> $to)" '
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rm -fr repo &&
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git init repo &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit_bulk 16 &&
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git tag old-tip &&
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git config core.multiPackIndex true &&
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if test "MIDX" = "$from"
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then
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git repack -Ad &&
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git multi-pack-index write --bitmap
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else
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git repack -Adb
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fi
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)
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'
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test_expect_success "build bitmap from existing ($from -> $to)" '
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit_bulk --id=further 16 &&
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git tag new-tip &&
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if test "MIDX" = "$to"
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then
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git repack -d &&
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git multi-pack-index write --bitmap
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else
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git repack -Adb
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fi
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)
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'
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test_expect_success "verify resulting bitmaps ($from -> $to)" '
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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git for-each-ref &&
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git rev-list --test-bitmap refs/tags/old-tip &&
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git rev-list --test-bitmap refs/tags/new-tip
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)
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'
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}
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test_midx_bitmap_cases () {
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writeLookupTable=false
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writeBitmapLookupTable=
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for i in "$@"
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do
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case $i in
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"pack.writeBitmapLookupTable")
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writeLookupTable=true
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writeBitmapLookupTable="$i"
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;;
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esac
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done
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test_expect_success 'setup test_repository' '
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rm -rf * .git &&
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git init &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"'
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'
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midx_bitmap_core
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bitmap_reuse_tests 'pack' 'MIDX' "$writeBitmapLookupTable"
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bitmap_reuse_tests 'MIDX' 'pack' "$writeBitmapLookupTable"
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bitmap_reuse_tests 'MIDX' 'MIDX' "$writeBitmapLookupTable"
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test_expect_success 'missing object closure fails gracefully' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit loose &&
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test_commit packed &&
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# Do not pass "--revs"; we want a pack without the "loose"
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# commit.
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git pack-objects $objdir/pack/pack <<-EOF &&
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$(git rev-parse packed)
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EOF
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test_must_fail git multi-pack-index write --bitmap 2>err &&
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grep "doesn.t have full closure" err &&
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test_path_is_missing $midx
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)
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'
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midx_bitmap_partial_tests
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test_expect_success 'removing a MIDX clears stale bitmaps' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit base &&
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git repack &&
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git multi-pack-index write --bitmap &&
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# Write a MIDX and bitmap; remove the MIDX but leave the bitmap.
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stale_bitmap=$midx-$(midx_checksum $objdir).bitmap &&
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rm $midx &&
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# Then write a new MIDX.
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test_commit new &&
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git repack &&
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git multi-pack-index write --bitmap &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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test_path_is_missing $stale_bitmap
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)
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'
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test_expect_success 'pack.preferBitmapTips' '
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit_bulk --message="%s" 103 &&
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git log --format="%H" >commits.raw &&
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sort <commits.raw >commits &&
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git log --format="create refs/tags/%s %H" HEAD >refs &&
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git update-ref --stdin <refs &&
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git multi-pack-index write --bitmap &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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test-tool bitmap list-commits | sort >bitmaps &&
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comm -13 bitmaps commits >before &&
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test_line_count = 1 before &&
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perl -ne "printf(\"create refs/tags/include/%d \", $.); print" \
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<before | git update-ref --stdin &&
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rm -fr $midx-$(midx_checksum $objdir).bitmap &&
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rm -fr $midx &&
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git -c pack.preferBitmapTips=refs/tags/include \
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multi-pack-index write --bitmap &&
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test-tool bitmap list-commits | sort >bitmaps &&
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comm -13 bitmaps commits >after &&
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! test_cmp before after
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)
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'
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test_expect_success 'writing a bitmap with --refs-snapshot' '
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit one &&
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test_commit two &&
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git rev-parse one >snapshot &&
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git repack -ad &&
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# First, write a MIDX which see both refs/tags/one and
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# refs/tags/two (causing both of those commits to receive
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# bitmaps).
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git multi-pack-index write --bitmap &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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test-tool bitmap list-commits | sort >bitmaps &&
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grep "$(git rev-parse one)" bitmaps &&
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grep "$(git rev-parse two)" bitmaps &&
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rm -fr $midx-$(midx_checksum $objdir).bitmap &&
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rm -fr $midx &&
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# Then again, but with a refs snapshot which only sees
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# refs/tags/one.
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git multi-pack-index write --bitmap --refs-snapshot=snapshot &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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test-tool bitmap list-commits | sort >bitmaps &&
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grep "$(git rev-parse one)" bitmaps &&
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! grep "$(git rev-parse two)" bitmaps
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)
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'
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test_expect_success 'write a bitmap with --refs-snapshot (preferred tips)' '
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit_bulk --message="%s" 103 &&
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git log --format="%H" >commits.raw &&
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sort <commits.raw >commits &&
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git log --format="create refs/tags/%s %H" HEAD >refs &&
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git update-ref --stdin <refs &&
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git multi-pack-index write --bitmap &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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test-tool bitmap list-commits | sort >bitmaps &&
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comm -13 bitmaps commits >before &&
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test_line_count = 1 before &&
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(
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grep -vf before commits.raw &&
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# mark missing commits as preferred
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sed "s/^/+/" before
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) >snapshot &&
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rm -fr $midx-$(midx_checksum $objdir).bitmap &&
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rm -fr $midx &&
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git multi-pack-index write --bitmap --refs-snapshot=snapshot &&
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test-tool bitmap list-commits | sort >bitmaps &&
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comm -13 bitmaps commits >after &&
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! test_cmp before after
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)
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'
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test_expect_success 'hash-cache values are propagated from pack bitmaps' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit base &&
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test_commit base2 &&
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git repack -adb &&
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test-tool bitmap dump-hashes >pack.raw &&
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test_file_not_empty pack.raw &&
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sort pack.raw >pack.hashes &&
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test_commit new &&
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git repack &&
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git multi-pack-index write --bitmap &&
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test-tool bitmap dump-hashes >midx.raw &&
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sort midx.raw >midx.hashes &&
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# ensure that every namehash in the pack bitmap can be found in
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# the midx bitmap (i.e., that there are no oid-namehash pairs
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# unique to the pack bitmap).
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comm -23 pack.hashes midx.hashes >dropped.hashes &&
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test_must_be_empty dropped.hashes
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)
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'
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test_expect_success 'no .bitmap is written without any objects' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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empty="$(git pack-objects $objdir/pack/pack </dev/null)" &&
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cat >packs <<-EOF &&
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pack-$empty.idx
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EOF
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git multi-pack-index write --bitmap --stdin-packs \
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<packs 2>err &&
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grep "bitmap without any objects" err &&
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test_path_is_file $midx &&
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test_path_is_missing $midx-$(midx_checksum $objdir).bitmap
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)
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'
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test_expect_success 'graceful fallback when missing reverse index' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
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test_commit base &&
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# write a pack and MIDX bitmap containing base
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git repack -adb &&
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git multi-pack-index write --bitmap &&
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GIT_TEST_MIDX_READ_RIDX=0 \
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git rev-list --use-bitmap-index HEAD 2>err &&
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! grep "ignoring extra bitmap file" err
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)
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'
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}
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test_midx_bitmap_cases
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test_midx_bitmap_cases "pack.writeBitmapLookupTable"
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test_expect_success 'multi-pack-index write writes lookup table if enabled' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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test_commit base &&
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git config pack.writeBitmapLookupTable true &&
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git repack -ad &&
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GIT_TRACE2_EVENT="$(pwd)/trace" \
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git multi-pack-index write --bitmap &&
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grep "\"label\":\"writing_lookup_table\"" trace
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)
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'
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test_expect_success 'preferred pack change with existing MIDX bitmap' '
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git init preferred-pack-with-existing &&
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(
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cd preferred-pack-with-existing &&
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test_commit base &&
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test_commit other &&
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git rev-list --objects --no-object-names base >p1.objects &&
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git rev-list --objects --no-object-names other >p2.objects &&
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p1="$(git pack-objects "$objdir/pack/pack" \
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--delta-base-offset <p1.objects)" &&
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p2="$(git pack-objects "$objdir/pack/pack" \
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--delta-base-offset <p2.objects)" &&
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# Generate a MIDX containing the first two packs,
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# marking p1 as preferred, and ensure that it can be
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# successfully cloned.
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git multi-pack-index write --bitmap \
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--preferred-pack="pack-$p1.pack" &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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git clone --no-local . clone1 &&
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# Then generate a new pack which sorts ahead of any
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# existing pack (by tweaking the pack prefix).
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test_commit foo &&
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git pack-objects --all --unpacked $objdir/pack/pack0 &&
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# Generate a new MIDX which changes the preferred pack
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# to a pack contained in the existing MIDX.
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git multi-pack-index write --bitmap \
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--preferred-pack="pack-$p2.pack" &&
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test_path_is_file $midx &&
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test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
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# When the above circumstances are met, the preferred
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# pack should change appropriately and clones should
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# (still) succeed.
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git clone --no-local . clone2
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)
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'
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test_expect_success 'tagged commits are selected for bitmapping' '
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rm -fr repo &&
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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test_commit --annotate base &&
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git repack -d &&
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# Remove refs/heads/main which points at the commit directly,
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# leaving only a reference to the annotated tag.
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git branch -M main &&
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git checkout base &&
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git branch -d main &&
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git multi-pack-index write --bitmap &&
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git rev-parse HEAD >want &&
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test-tool bitmap list-commits >actual &&
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grep $(cat want) actual
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)
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'
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corrupt_file () {
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chmod a+w "$1" &&
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printf "bogus" | dd of="$1" bs=1 seek="12" conv=notrunc
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}
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test_expect_success 'git fsck correctly identifies good and bad bitmaps' '
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git init valid &&
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test_when_finished rm -rf valid &&
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test_commit_bulk 20 &&
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git repack -adbf &&
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# Move pack-bitmap aside so it is not deleted
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# in next repack.
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packbitmap=$(ls .git/objects/pack/pack-*.bitmap) &&
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mv "$packbitmap" "$packbitmap.bak" &&
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test_commit_bulk 10 &&
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git repack -b --write-midx &&
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midxbitmap=$(ls .git/objects/pack/multi-pack-index-*.bitmap) &&
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# Copy MIDX bitmap to backup. Copy pack bitmap from backup.
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cp "$midxbitmap" "$midxbitmap.bak" &&
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cp "$packbitmap.bak" "$packbitmap" &&
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# fsck works at first
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git fsck 2>err &&
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test_must_be_empty err &&
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corrupt_file "$packbitmap" &&
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test_must_fail git fsck 2>err &&
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grep "bitmap file '\''$packbitmap'\'' has invalid checksum" err &&
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cp "$packbitmap.bak" "$packbitmap" &&
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corrupt_file "$midxbitmap" &&
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test_must_fail git fsck 2>err &&
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grep "bitmap file '\''$midxbitmap'\'' has invalid checksum" err &&
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corrupt_file "$packbitmap" &&
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test_must_fail git fsck 2>err &&
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grep "bitmap file '\''$midxbitmap'\'' has invalid checksum" err &&
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grep "bitmap file '\''$packbitmap'\'' has invalid checksum" err
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'
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test_expect_success 'corrupt MIDX with bitmap causes fallback' '
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git init corrupt-midx-bitmap &&
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(
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cd corrupt-midx-bitmap &&
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test_commit first &&
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git repack -d &&
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test_commit second &&
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git repack -d &&
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git multi-pack-index write --bitmap &&
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checksum=$(midx_checksum $objdir) &&
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for f in $midx $midx-$checksum.bitmap
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do
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mv $f $f.bak || return 1
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done &&
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# pack everything together, invalidating the MIDX
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git repack -ad &&
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# then restore the now-stale MIDX
|
|
for f in $midx $midx-$checksum.bitmap
|
|
do
|
|
mv $f.bak $f || return 1
|
|
done &&
|
|
|
|
git rev-list --count --objects --use-bitmap-index HEAD >out 2>err &&
|
|
# should attempt opening the broken pack twice (once
|
|
# from the attempt to load it via the stale bitmap, and
|
|
# again when attempting to load it from the stale MIDX)
|
|
# before falling back to the non-MIDX case
|
|
test 2 -eq $(grep -c "could not open pack" err) &&
|
|
test 6 -eq $(cat out)
|
|
)
|
|
'
|
|
|
|
test_done
|