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![SZEDER Gábor](/assets/img/avatar_default.png)
Running tests with GIT_TEST_SPLIT_INDEX=1 is supposed to turn on the split index feature and trigger index splitting (mostly) randomly. Alas, this has been broken since6e37c8ed3c
(read-cache.c: fix writing "link" index ext with null base oid, 2019-02-13), and GIT_TEST_SPLIT_INDEX=1 hasn't triggered any index splitting since then. This patch makes GIT_TEST_SPLIT_INDEX work again, though it doesn't restore the pre-6e37c8ed3c behavior. To understand the bug, the fix, and the behavior change we first have to look at how GIT_TEST_SPLIT_INDEX used to work before6e37c8ed3c
: There are two places where we check the value of GIT_TEST_SPLIT_INDEX, and before6e37c8ed3c
they worked like this: 1) In the lower-level do_write_index(), where, if GIT_TEST_SPLIT_INDEX is enabled, we call init_split_index(). This call merely allocates and zero-initializes 'istate->split_index', but does nothing else (i.e. doesn't fill the base/shared index with cache entries, doesn't actually write a shared index file, etc.). Pertinent to this issue, the hash of the base index remains all zeroed out. 2) In the higher-level write_locked_index(), but only when 'istate->split_index' has already been initialized. Then, if GIT_TEST_SPLIT_INDEX is enabled, it randomly sets the flag that triggers index splitting later in this function. This randomness comes from the first byte of the hash of the base index via an 'if ((first_byte & 15) < 6)' condition. However, if 'istate->split_index' hasn't been initialized (i.e. it is still NULL), then write_locked_index() just calls do_write_locked_index(), which internally calls the above mentioned do_write_index(). This means that while GIT_TEST_SPLIT_INDEX=1 usually triggered index splitting randomly, the first two index writes were always deterministic (though I suspect this was unintentional): - The initial index write never splits the index. During the first index write write_locked_index() is called with 'istate->split_index' still uninitialized, so the check in 2) is not executed. It still calls do_write_index(), though, which then executes the check in 1). The resulting all zero base index hash then leads to the 'link' extension being written to '.git/index', though a shared index file is not written: $ rm .git/index $ GIT_TEST_SPLIT_INDEX=1 git update-index --add file $ test-tool dump-split-index .git/index own c6ef71168597caec8553c83d9d0048f1ef416170 base 0000000000000000000000000000000000000000 100644 d00491fd7e5bb6fa28c517a0bb32b8b506539d4d 0 file replacements: deletions: $ ls -l .git/sharedindex.* ls: cannot access '.git/sharedindex.*': No such file or directory - The second index write always splits the index. When the index written in the previous point is read, 'istate->split_index' is initialized because of the presence of the 'link' extension. So during the second write write_locked_index() does run the check in 2), and the first byte of the all zero base index hash always fulfills the randomness condition, which in turn always triggers the index splitting. - Subsequent index writes will find the 'link' extension with a real non-zero base index hash, so from then on the check in 2) is executed and the first byte of the base index hash is as random as it gets (coming from the SHA-1 of index data including timestamps and inodes...). All this worked until6e37c8ed3c
came along, and stopped writing the 'link' extension if the hash of the base index was all zero: $ rm .git/index $ GIT_TEST_SPLIT_INDEX=1 git update-index --add file $ test-tool dump-split-index .git/index own abbd6f6458d5dee73ae8e210ca15a68a390c6fd7 not a split index $ ls -l .git/sharedindex.* ls: cannot access '.git/sharedindex.*': No such file or directory So, since the first index write with GIT_TEST_SPLIT_INDEX=1 doesn't write a 'link' extension, in the second index write 'istate->split_index' remains uninitialized, and the check in 2) is not executed, and ultimately the index is never split. Fix this by modifying write_locked_index() to make sure to check GIT_TEST_SPLIT_INDEX even if 'istate->split_index' is still uninitialized, and initialize it if necessary. The check for GIT_TEST_SPLIT_INDEX and separate init_split_index() call in do_write_index() thus becomes unnecessary, so remove it. Furthermore, add a test to 't1700-split-index.sh' to make sure that GIT_TEST_SPLIT_INDEX=1 will keep working (though only check the index splitting on the first index write, because after that it will be random). Note that this change does not restore the pre-6e37c8ed3c behaviour, as it will deterministically split the index already on the first index write. Since GIT_TEST_SPLIT_INDEX is purely a developer aid, there is no backwards compatibility issue here. The new behaviour did trigger test failures in 't0003-attributes.sh' and 't1600-index.sh', though, which have been fixed in preparatory patches in this series. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Acked-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
548 lines
15 KiB
Bash
Executable file
548 lines
15 KiB
Bash
Executable file
#!/bin/sh
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test_description='split index mode tests'
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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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# We need total control of index splitting here
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sane_unset GIT_TEST_SPLIT_INDEX
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# Testing a hard coded SHA against an index with an extension
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# that can vary from run to run is problematic so we disable
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# those extensions.
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sane_unset GIT_TEST_FSMONITOR
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sane_unset GIT_TEST_INDEX_THREADS
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# Create a file named as $1 with content read from stdin.
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# Set the file's mtime to a few seconds in the past to avoid racy situations.
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create_non_racy_file () {
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cat >"$1" &&
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test-tool chmtime =-5 "$1"
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}
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test_expect_success 'setup' '
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test_oid_cache <<-EOF
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own_v3 sha1:8299b0bcd1ac364e5f1d7768efb62fa2da79a339
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own_v3 sha256:38a6d2925e3eceec33ad7b34cbff4e0086caa0daf28f31e51f5bd94b4a7af86b
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base_v3 sha1:39d890139ee5356c7ef572216cebcd27aa41f9df
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base_v3 sha256:c9baeadf905112bf6c17aefbd7d02267afd70ded613c30cafed2d40cb506e1ed
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own_v4 sha1:432ef4b63f32193984f339431fd50ca796493569
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own_v4 sha256:6738ac6319c25b694afa7bcc313deb182d1a59b68bf7a47b4296de83478c0420
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base_v4 sha1:508851a7f0dfa8691e9f69c7f055865389012491
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base_v4 sha256:3177d4adfdd4b6904f7e921d91d715a471c0dde7cf6a4bba574927f02b699508
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EOF
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'
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test_expect_success 'enable split index' '
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git config splitIndex.maxPercentChange 100 &&
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git update-index --split-index &&
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test-tool dump-split-index .git/index >actual &&
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indexversion=$(test-tool index-version <.git/index) &&
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# NEEDSWORK: Stop hard-coding checksums.
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if test "$indexversion" = "4"
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then
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own=$(test_oid own_v4)
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base=$(test_oid base_v4)
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else
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own=$(test_oid own_v3)
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base=$(test_oid base_v3)
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fi &&
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cat >expect <<-EOF &&
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own $own
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base $base
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'add one file' '
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create_non_racy_file one &&
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git update-index --add one &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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base $base
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100644 $EMPTY_BLOB 0 one
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'disable split index' '
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git update-index --no-split-index &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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BASE=$(test-tool dump-split-index .git/index | sed -n "s/^own/base/p") &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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not a split index
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EOF
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test_cmp expect actual
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'
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test_expect_success 'enable split index again, "one" now belongs to base index"' '
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git update-index --split-index &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'modify original file, base index untouched' '
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echo modified | create_non_racy_file one &&
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file1_blob=$(git hash-object one) &&
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git update-index one &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $file1_blob 0 one
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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q_to_tab >expect <<-EOF &&
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$BASE
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100644 $file1_blob 0Q
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replacements: 0
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'add another file, which stays index' '
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create_non_racy_file two &&
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git update-index --add two &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $file1_blob 0 one
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100644 $EMPTY_BLOB 0 two
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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q_to_tab >expect <<-EOF &&
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$BASE
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100644 $file1_blob 0Q
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100644 $EMPTY_BLOB 0 two
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replacements: 0
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'remove file not in base index' '
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git update-index --force-remove two &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $file1_blob 0 one
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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q_to_tab >expect <<-EOF &&
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$BASE
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100644 $file1_blob 0Q
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replacements: 0
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'remove file in base index' '
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git update-index --force-remove one &&
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git ls-files --stage >ls-files.actual &&
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test_must_be_empty ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions: 0
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EOF
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test_cmp expect actual
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'
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test_expect_success 'add original file back' '
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create_non_racy_file one &&
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git update-index --add one &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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100644 $EMPTY_BLOB 0 one
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replacements:
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deletions: 0
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EOF
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test_cmp expect actual
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'
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test_expect_success 'add new file' '
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create_non_racy_file two &&
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git update-index --add two &&
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git ls-files --stage >actual &&
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cat >expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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100644 $EMPTY_BLOB 0 two
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EOF
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test_cmp expect actual
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'
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test_expect_success 'unify index, two files remain' '
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git update-index --no-split-index &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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100644 $EMPTY_BLOB 0 two
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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not a split index
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EOF
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test_cmp expect actual
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'
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test_expect_success 'rev-parse --shared-index-path' '
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test_create_repo split-index &&
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(
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cd split-index &&
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git update-index --split-index &&
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echo .git/sharedindex* >expect &&
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git rev-parse --shared-index-path >actual &&
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test_cmp expect actual &&
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mkdir subdirectory &&
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cd subdirectory &&
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echo ../.git/sharedindex* >expect &&
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git rev-parse --shared-index-path >actual &&
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test_cmp expect actual
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)
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'
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test_expect_success 'set core.splitIndex config variable to true' '
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git config core.splitIndex true &&
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create_non_racy_file three &&
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git update-index --add three &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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100644 $EMPTY_BLOB 0 three
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100644 $EMPTY_BLOB 0 two
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'set core.splitIndex config variable to false' '
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git config core.splitIndex false &&
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git update-index --force-remove three &&
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git ls-files --stage >ls-files.actual &&
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cat >ls-files.expect <<-EOF &&
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100644 $EMPTY_BLOB 0 one
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100644 $EMPTY_BLOB 0 two
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EOF
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test_cmp ls-files.expect ls-files.actual &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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not a split index
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EOF
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test_cmp expect actual
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'
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test_expect_success 'set core.splitIndex config variable back to true' '
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git config core.splitIndex true &&
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create_non_racy_file three &&
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git update-index --add three &&
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BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions:
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EOF
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test_cmp expect actual &&
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create_non_racy_file four &&
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git update-index --add four &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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100644 $EMPTY_BLOB 0 four
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'check behavior with splitIndex.maxPercentChange unset' '
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git config --unset splitIndex.maxPercentChange &&
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create_non_racy_file five &&
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git update-index --add five &&
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BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions:
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EOF
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test_cmp expect actual &&
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create_non_racy_file six &&
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git update-index --add six &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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100644 $EMPTY_BLOB 0 six
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'check splitIndex.maxPercentChange set to 0' '
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git config splitIndex.maxPercentChange 0 &&
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create_non_racy_file seven &&
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git update-index --add seven &&
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BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions:
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EOF
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test_cmp expect actual &&
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create_non_racy_file eight &&
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git update-index --add eight &&
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BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
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test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
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cat >expect <<-EOF &&
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$BASE
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replacements:
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deletions:
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EOF
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test_cmp expect actual
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'
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test_expect_success 'shared index files expire after 2 weeks by default' '
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create_non_racy_file ten &&
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git update-index --add ten &&
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test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
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just_under_2_weeks_ago=$((5-14*86400)) &&
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test-tool chmtime =$just_under_2_weeks_ago .git/sharedindex.* &&
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create_non_racy_file eleven &&
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git update-index --add eleven &&
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test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
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just_over_2_weeks_ago=$((-1-14*86400)) &&
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test-tool chmtime =$just_over_2_weeks_ago .git/sharedindex.* &&
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create_non_racy_file twelve &&
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git update-index --add twelve &&
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test $(ls .git/sharedindex.* | wc -l) -le 2
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'
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test_expect_success 'check splitIndex.sharedIndexExpire set to 16 days' '
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git config splitIndex.sharedIndexExpire "16.days.ago" &&
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test-tool chmtime =$just_over_2_weeks_ago .git/sharedindex.* &&
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create_non_racy_file thirteen &&
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git update-index --add thirteen &&
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test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
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just_over_16_days_ago=$((-1-16*86400)) &&
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test-tool chmtime =$just_over_16_days_ago .git/sharedindex.* &&
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create_non_racy_file fourteen &&
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git update-index --add fourteen &&
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test $(ls .git/sharedindex.* | wc -l) -le 2
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'
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test_expect_success 'check splitIndex.sharedIndexExpire set to "never" and "now"' '
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git config splitIndex.sharedIndexExpire never &&
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just_10_years_ago=$((-365*10*86400)) &&
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test-tool chmtime =$just_10_years_ago .git/sharedindex.* &&
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create_non_racy_file fifteen &&
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git update-index --add fifteen &&
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test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
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git config splitIndex.sharedIndexExpire now &&
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just_1_second_ago=-1 &&
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test-tool chmtime =$just_1_second_ago .git/sharedindex.* &&
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create_non_racy_file sixteen &&
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git update-index --add sixteen &&
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test $(ls .git/sharedindex.* | wc -l) -le 2
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'
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test_expect_success POSIXPERM 'same mode for index & split index' '
|
|
git init same-mode &&
|
|
(
|
|
cd same-mode &&
|
|
test_commit A &&
|
|
test_modebits .git/index >index_mode &&
|
|
test_must_fail git config core.sharedRepository &&
|
|
git -c core.splitIndex=true status &&
|
|
shared=$(ls .git/sharedindex.*) &&
|
|
case "$shared" in
|
|
*" "*)
|
|
# we have more than one???
|
|
false ;;
|
|
*)
|
|
test_modebits "$shared" >split_index_mode &&
|
|
test_cmp index_mode split_index_mode ;;
|
|
esac
|
|
)
|
|
'
|
|
|
|
while read -r mode modebits
|
|
do
|
|
test_expect_success POSIXPERM "split index respects core.sharedrepository $mode" '
|
|
# Remove existing shared index files
|
|
git config core.splitIndex false &&
|
|
git update-index --force-remove one &&
|
|
rm -f .git/sharedindex.* &&
|
|
# Create one new shared index file
|
|
git config core.sharedrepository "$mode" &&
|
|
git config core.splitIndex true &&
|
|
create_non_racy_file one &&
|
|
git update-index --add one &&
|
|
echo "$modebits" >expect &&
|
|
test_modebits .git/index >actual &&
|
|
test_cmp expect actual &&
|
|
shared=$(ls .git/sharedindex.*) &&
|
|
case "$shared" in
|
|
*" "*)
|
|
# we have more than one???
|
|
false ;;
|
|
*)
|
|
test_modebits "$shared" >actual &&
|
|
test_cmp expect actual ;;
|
|
esac
|
|
'
|
|
done <<\EOF
|
|
0666 -rw-rw-rw-
|
|
0642 -rw-r---w-
|
|
EOF
|
|
|
|
test_expect_success POSIXPERM,SANITY 'graceful handling when splitting index is not allowed' '
|
|
test_create_repo ro &&
|
|
(
|
|
cd ro &&
|
|
test_commit initial &&
|
|
git update-index --split-index &&
|
|
test -f .git/sharedindex.*
|
|
) &&
|
|
cp ro/.git/index new-index &&
|
|
test_when_finished "chmod u+w ro/.git" &&
|
|
chmod u-w ro/.git &&
|
|
GIT_INDEX_FILE="$(pwd)/new-index" git -C ro update-index --split-index &&
|
|
chmod u+w ro/.git &&
|
|
rm ro/.git/sharedindex.* &&
|
|
GIT_INDEX_FILE=new-index git ls-files >actual &&
|
|
echo initial.t >expected &&
|
|
test_cmp expected actual
|
|
'
|
|
|
|
test_expect_success 'writing split index with null sha1 does not write cache tree' '
|
|
git config core.splitIndex true &&
|
|
git config splitIndex.maxPercentChange 0 &&
|
|
git commit -m "commit" &&
|
|
{
|
|
git ls-tree HEAD &&
|
|
printf "160000 commit $ZERO_OID\\tbroken\\n"
|
|
} >broken-tree &&
|
|
echo "add broken entry" >msg &&
|
|
|
|
tree=$(git mktree <broken-tree) &&
|
|
test_tick &&
|
|
commit=$(git commit-tree $tree -p HEAD <msg) &&
|
|
git update-ref HEAD "$commit" &&
|
|
GIT_ALLOW_NULL_SHA1=1 git reset --hard &&
|
|
test_might_fail test-tool dump-cache-tree >cache-tree.out &&
|
|
test_line_count = 0 cache-tree.out
|
|
'
|
|
|
|
test_expect_success 'do not refresh null base index' '
|
|
test_create_repo merge &&
|
|
(
|
|
cd merge &&
|
|
test_commit initial &&
|
|
git checkout -b side-branch &&
|
|
test_commit extra &&
|
|
git checkout main &&
|
|
git update-index --split-index &&
|
|
test_commit more &&
|
|
# must not write a new shareindex, or we wont catch the problem
|
|
git -c splitIndex.maxPercentChange=100 merge --no-edit side-branch 2>err &&
|
|
# i.e. do not expect warnings like
|
|
# could not freshen shared index .../shareindex.00000...
|
|
test_must_be_empty err
|
|
)
|
|
'
|
|
|
|
test_expect_success 'reading split index at alternate location' '
|
|
git init reading-alternate-location &&
|
|
(
|
|
cd reading-alternate-location &&
|
|
>file-in-alternate &&
|
|
git update-index --split-index --add file-in-alternate
|
|
) &&
|
|
echo file-in-alternate >expect &&
|
|
|
|
# Should be able to find the shared index both right next to
|
|
# the specified split index file ...
|
|
GIT_INDEX_FILE=./reading-alternate-location/.git/index \
|
|
git ls-files --cached >actual &&
|
|
test_cmp expect actual &&
|
|
|
|
# ... and, for backwards compatibility, in the current GIT_DIR
|
|
# as well.
|
|
mv -v ./reading-alternate-location/.git/sharedindex.* .git &&
|
|
GIT_INDEX_FILE=./reading-alternate-location/.git/index \
|
|
git ls-files --cached >actual &&
|
|
test_cmp expect actual
|
|
'
|
|
|
|
test_expect_success 'GIT_TEST_SPLIT_INDEX works' '
|
|
git init git-test-split-index &&
|
|
(
|
|
cd git-test-split-index &&
|
|
>file &&
|
|
GIT_TEST_SPLIT_INDEX=1 git update-index --add file &&
|
|
ls -l .git/sharedindex.* >actual &&
|
|
test_line_count = 1 actual
|
|
)
|
|
'
|
|
|
|
test_done
|