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32ed3314c1
The `test_cmp` function is meant to provide nicer output than `cmp` when
expected and actual output of Git commands disagree. The implicit
assumption is that the output is line-based and human readable.
However, aaf81223f4 (unpack-objects: use stream_loose_object() to
unpack large objects, 2022-06-11) introduced a call that compares the
contents of pack files, which are distinctly not line-based nor human
readable.
This causes problems because on Windows, we hand off to the Bash
function `mingw_test_cmp` that compares the lines while ignoring line
ending differences. And this Bash function spends an insane amount of
cycles trying to read in that binary pack file, so that it is almost
indistinguishable from an infinite loop.
For example, t5351 took 1486 seconds in the CI run at
https://github.com/git/git/runs/7398490747?check_suite_focus=true#step:5:171,
to complete. And yes, that is almost half an hour.
Since Git's tests already use `cmp` consistently when comparing pack
files, let's change this instance to use `cmp` instead of `test_cmp`,
too, and fix that performance problem.
Now t5351 takes all of 22 seconds.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
102 lines
2.8 KiB
Bash
Executable file
102 lines
2.8 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2022 Han Xin
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#
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test_description='git unpack-objects with large objects'
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. ./test-lib.sh
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prepare_dest () {
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test_when_finished "rm -rf dest.git" &&
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git init --bare dest.git &&
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git -C dest.git config core.bigFileThreshold "$1"
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}
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test_expect_success "create large objects (1.5 MB) and PACK" '
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test-tool genrandom foo 1500000 >big-blob &&
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test_commit --append foo big-blob &&
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test-tool genrandom bar 1500000 >big-blob &&
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test_commit --append bar big-blob &&
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PACK=$(echo HEAD | git pack-objects --revs pack) &&
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git verify-pack -v pack-$PACK.pack >out &&
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sed -n -e "s/^\([0-9a-f][0-9a-f]*\).*\(commit\|tree\|blob\).*/\1/p" \
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<out >obj-list
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'
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test_expect_success 'set memory limitation to 1MB' '
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GIT_ALLOC_LIMIT=1m &&
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export GIT_ALLOC_LIMIT
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'
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test_expect_success 'unpack-objects failed under memory limitation' '
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prepare_dest 2m &&
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test_must_fail git -C dest.git unpack-objects <pack-$PACK.pack 2>err &&
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grep "fatal: attempting to allocate" err
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'
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test_expect_success 'unpack-objects works with memory limitation in dry-run mode' '
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prepare_dest 2m &&
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git -C dest.git unpack-objects -n <pack-$PACK.pack &&
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test_stdout_line_count = 0 find dest.git/objects -type f &&
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test_dir_is_empty dest.git/objects/pack
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'
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test_expect_success 'unpack big object in stream' '
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prepare_dest 1m &&
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git -C dest.git unpack-objects <pack-$PACK.pack &&
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test_dir_is_empty dest.git/objects/pack
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'
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check_fsync_events () {
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local trace="$1" &&
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shift &&
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cat >expect &&
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sed -n \
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-e '/^{"event":"data",.*"category":"fsync",/ {
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s/.*"category":"fsync",//;
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s/}$//;
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p;
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}' \
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<"$trace" >actual &&
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test_cmp expect actual
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}
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BATCH_CONFIGURATION='-c core.fsync=loose-object -c core.fsyncmethod=batch'
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test_expect_success 'unpack big object in stream (core.fsyncmethod=batch)' '
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prepare_dest 1m &&
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GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
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GIT_TEST_FSYNC=true \
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git -C dest.git $BATCH_CONFIGURATION unpack-objects <pack-$PACK.pack &&
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if grep "core.fsyncMethod = batch is unsupported" trace2.txt
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then
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flush_count=7
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else
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flush_count=1
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fi &&
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check_fsync_events trace2.txt <<-EOF &&
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"key":"fsync/writeout-only","value":"6"
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"key":"fsync/hardware-flush","value":"$flush_count"
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EOF
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test_dir_is_empty dest.git/objects/pack &&
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git -C dest.git cat-file --batch-check="%(objectname)" <obj-list >current &&
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cmp obj-list current
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'
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test_expect_success 'do not unpack existing large objects' '
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prepare_dest 1m &&
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git -C dest.git index-pack --stdin <pack-$PACK.pack &&
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git -C dest.git unpack-objects <pack-$PACK.pack &&
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# The destination came up with the exact same pack...
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DEST_PACK=$(echo dest.git/objects/pack/pack-*.pack) &&
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cmp pack-$PACK.pack $DEST_PACK &&
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# ...and wrote no loose objects
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test_stdout_line_count = 0 find dest.git/objects -type f ! -name "pack-*"
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'
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test_done
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