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a1bf5ca29f
As the name implies, "get_data(size)" will allocate and return a given
amount of memory. Allocating memory for a large blob object may cause the
system to run out of memory. Before preparing to replace calling of
"get_data()" to unpack large blob objects in latter commits, refactor
"get_data()" to reduce memory footprint for dry_run mode.
Because in dry_run mode, "get_data()" is only used to check the
integrity of data, and the returned buffer is not used at all, we can
allocate a smaller buffer and use it as zstream output. Make the function
return NULL in the dry-run mode, as no callers use the returned buffer.
The "find [...]objects/?? -type f | wc -l" test idiom being used here
is adapted from the same "find" use added to another test in
d9545c7f46 (fast-import: implement unpack limit, 2016-04-25).
Suggested-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Han Xin <chiyutianyi@gmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
41 lines
1 KiB
Bash
Executable file
41 lines
1 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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}
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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=$(echo HEAD | git pack-objects --revs pack)
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'
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test_expect_success 'set memory limitation to 1MB' '
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GIT_ALLOC_LIMIT=1m &&
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export GIT_ALLOC_LIMIT
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'
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test_expect_success 'unpack-objects failed under memory limitation' '
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prepare_dest &&
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test_must_fail git -C dest.git unpack-objects <pack-$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 &&
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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_done
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