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rev-parse: add a --show-object-format option

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Add an option to print the object format used for input, output, or
storage. This allows shell scripts to discover the hash algorithm in
use.

Since the transition plan allows for multiple input algorithms, document
that we may provide multiple results for input, and the format that the
results may take. While we don't support this now, documenting it early
means that script authors can future-proof their scripts for when we do.

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
2019-10-28 00:58:55 +00:00
committed by Junio C Hamano
parent 1bcef51204
commit 2eabd38313
3 changed files with 33 additions and 0 deletions
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11
builtin/rev-parse.c
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@ -918,6 +918,17 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
show_datestring("--min-age=", arg);
continue;
}
if (opt_with_value(arg, "--show-object-format", &arg)) {
const char *val = arg ? arg : "storage";
if (strcmp(val, "storage") &&
strcmp(val, "input") &&
strcmp(val, "output"))
die("unknown mode for --show-object-format: %s",
arg);
puts(the_hash_algo->name);
continue;
}
if (show_flag(arg) && verify)
die_no_single_rev(quiet);
continue;