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introduce GIT_INDEX_VERSION environment variable

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Respect a GIT_INDEX_VERSION environment variable, when a new index is
initialized.  Setting the environment variable will not cause existing
index files to be converted to another format, but will only affect
newly written index files.  This can be used to initialize repositories
with index-v4.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Thomas Gummerer
2014-02-23 21:49:57 +01:00
committed by Junio C Hamano
parent 5f95c9f850
commit 136347d718
3 changed files with 74 additions and 1 deletions
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21
read-cache.c
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@ -1219,6 +1219,25 @@ static struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int reall
#define INDEX_FORMAT_DEFAULT 3
static unsigned int get_index_format_default(void)
{
char *envversion = getenv("GIT_INDEX_VERSION");
if (!envversion) {
return INDEX_FORMAT_DEFAULT;
} else {
char *endp;
unsigned int version = strtoul(envversion, &endp, 10);
if (*endp ||
version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
warning(_("GIT_INDEX_VERSION set, but the value is invalid.\n"
"Using version %i"), INDEX_FORMAT_DEFAULT);
version = INDEX_FORMAT_DEFAULT;
}
return version;
}
}
/*
* dev/ino/uid/gid/size are also just tracked to the low 32 bits
* Again - this is just a (very strong in practice) heuristic that
@ -1795,7 +1814,7 @@ int write_index(struct index_state *istate, int newfd)
}
if (!istate->version)
istate->version = INDEX_FORMAT_DEFAULT;
istate->version = get_index_format_default();
/* demote version 3 to version 2 when the latter suffices */
if (istate->version == 3 || istate->version == 2)