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read-cache: force split index mode with GIT_TEST_SPLIT_INDEX

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This could be used to run the whole test suite with split
indexes. Index splitting is carried out at random. "git read-tree"
also resets the index and forces splitting at the next update.

I had a lot of headaches with the test suite, which proves it
exercises split index pretty good.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2014-06-13 19:19:49 +07:00 committed by Junio C Hamano
parent 5a092ceb6b
commit d6e3c181bc
1 changed files with 9 additions and 1 deletions
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10
read-cache.c
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@ -1885,8 +1885,11 @@ static int do_write_index(struct index_state *istate, int newfd,
}
}
if (!istate->version)
if (!istate->version) {
istate->version = get_index_format_default();
if (getenv("GIT_TEST_SPLIT_INDEX"))
init_split_index(istate);
}
/* demote version 3 to version 2 when the latter suffices */
if (istate->version == 3 || istate->version == 2)
@ -2077,6 +2080,11 @@ int write_locked_index(struct index_state *istate, struct lock_file *lock,
return do_write_locked_index(istate, lock, flags);
}
if (getenv("GIT_TEST_SPLIT_INDEX")) {
int v = si->base_sha1[0];
if ((v & 15) < 6)
istate->cache_changed |= SPLIT_INDEX_ORDERED;
}
if (istate->cache_changed & SPLIT_INDEX_ORDERED) {
int ret = write_shared_index(istate, lock, flags);
if (ret)