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builtin/show-index: provide options to determine hash algo

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show-index is capable of reading any possible index file whether or not
the index is inside a repository.  However, because our index files lack
metadata about the hash algorithm in use, it's not possible to
autodetect the algorithm that a particular index file is using.

In order to allow us to read index files of any algorithm, let's set up
the .git directory gently so that we default to the algorithm for the
current repository, and add an --object-format option to allow users to
override this setting and continue to run show-index outside of a
repository altogether.  Let's also document this new option so that
people can find it and use it.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2020-05-25 19:59:12 +00:00
committed by Junio C Hamano
parent 1610dda8ae
commit 88a09a557c
3 changed files with 35 additions and 7 deletions
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29
builtin/show-index.c
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@ -1,9 +1,12 @@
#include "builtin.h"
#include "cache.h"
#include "pack.h"
#include "parse-options.h"
static const char show_index_usage[] =
"git show-index";
static const char *const show_index_usage[] = {
"git show-index [--object-format=<hash-algorithm>]",
NULL
};
int cmd_show_index(int argc, const char **argv, const char *prefix)
{
@ -11,10 +14,26 @@ int cmd_show_index(int argc, const char **argv, const char *prefix)
unsigned nr;
unsigned int version;
static unsigned int top_index[256];
const unsigned hashsz = the_hash_algo->rawsz;
unsigned hashsz;
const char *hash_name = NULL;
int hash_algo;
const struct option show_index_options[] = {
OPT_STRING(0, "object-format", &hash_name, N_("hash-algorithm"),
N_("specify the hash algorithm to use")),
OPT_END()
};
argc = parse_options(argc, argv, prefix, show_index_options, show_index_usage, 0);
if (hash_name) {
hash_algo = hash_algo_by_name(hash_name);
if (hash_algo == GIT_HASH_UNKNOWN)
die(_("Unknown hash algorithm"));
repo_set_hash_algo(the_repository, hash_algo);
}
hashsz = the_hash_algo->rawsz;
if (argc != 1)
usage(show_index_usage);
if (fread(top_index, 2 * 4, 1, stdin) != 1)
die("unable to read header");
if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {