rev-parse: add an --output-object-format parameter

The new --output-object-format parameter returns the oid in the
specified format.

This is a generally useful plumbing facility.  It is useful for writing
test cases and for directly querying the translation maps.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index f26a7591e3737df6bcf190fc26f0fe2bf50fcd83..f0f9021f2a5a0b6a51798b71d61729efcc0be969 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -159,6 +159,18 @@ for another option.
        unfortunately named tag "master"), and show them as full
        refnames (e.g. "refs/heads/master").
 
+--output-object-format=(sha1|sha256|storage)::
+
+       Allow oids to be input from any object format that the current
+       repository supports.
+
+       Specifying "sha1" translates if necessary and returns a sha1 oid.
+
+       Specifying "sha256" translates if necessary and returns a sha256 oid.
+
+       Specifying "storage" translates if necessary and returns an oid in
+       encoded in the storage hash algorithm.
+
 Options for Objects
 ~~~~~~~~~~~~~~~~~~~
 

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 43e96765400c48433efa9a03062fd6f5d7614d9d..0ef3e658cc5bbdba07a71d4dbea3a496708020c4 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -25,6 +25,7 @@
 #include "submodule.h"
 #include "commit-reach.h"
 #include "shallow.h"
+#include "object-file-convert.h"
 
 #define DO_REVS                1
 #define DO_NOREV       2
@@ -675,6 +676,8 @@ static void print_path(const char *path, const char *prefix, enum format_type fo
 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 {
        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
+       const struct git_hash_algo *output_algo = NULL;
+       const struct git_hash_algo *compat = NULL;
        int did_repo_setup = 0;
        int has_dashdash = 0;
        int output_prefix = 0;
@@ -746,6 +749,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 
                        prepare_repo_settings(the_repository);
                        the_repository->settings.command_requires_full_index = 0;
+                       compat = the_repository->compat_hash_algo;
                }
 
                if (!strcmp(arg, "--")) {
@@ -833,6 +837,22 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                                flags |= GET_OID_QUIETLY;
                                continue;
                        }
+                       if (opt_with_value(arg, "--output-object-format", &arg)) {
+                               if (!arg)
+                                       die(_("no object format specified"));
+                               if (!strcmp(arg, the_hash_algo->name) ||
+                                   !strcmp(arg, "storage")) {
+                                       flags |= GET_OID_HASH_ANY;
+                                       output_algo = the_hash_algo;
+                                       continue;
+                               }
+                               else if (compat && !strcmp(arg, compat->name)) {
+                                       flags |= GET_OID_HASH_ANY;
+                                       output_algo = compat;
+                                       continue;
+                               }
+                               else die(_("unsupported object format: %s"), arg);
+                       }
                        if (opt_with_value(arg, "--short", &arg)) {
                                filter &= ~(DO_FLAGS|DO_NOREV);
                                verify = 1;
@@ -1083,6 +1103,9 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                }
                if (!get_oid_with_context(the_repository, name,
                                          flags, &oid, &unused)) {
+                       if (output_algo)
+                               repo_oid_to_algop(the_repository, &oid,
+                                                 output_algo, &oid);
                        if (verify)
                                revs_count++;
                        else