ref-filter: implement '--points-at' option

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index ecb488822f903c56b5d14bdec3130c71817e1b65..049a95f1f113289a1a01f74a2485d1e9b282209f 100644 (file)
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -8,6 +8,7 @@
 #include "parse-options.h"
 #include "userdiff.h"
 #include "streaming.h"
+#include "tree-walk.h"
 
 static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
                        int unknown_type)
@@ -233,6 +234,7 @@ static void print_object_or_die(int fd, struct expand_data *data)
 
 struct batch_options {
        int enabled;
+       int follow_symlinks;
        int print_contents;
        const char *format;
 };
@@ -241,12 +243,44 @@ static int batch_one_object(const char *obj_name, struct batch_options *opt,
                            struct expand_data *data)
 {
        struct strbuf buf = STRBUF_INIT;
+       struct object_context ctx;
+       int flags = opt->follow_symlinks ? GET_SHA1_FOLLOW_SYMLINKS : 0;
+       enum follow_symlinks_result result;
 
        if (!obj_name)
           return 1;
 
-       if (get_sha1(obj_name, data->sha1)) {
-               printf("%s missing\n", obj_name);
+       result = get_sha1_with_context(obj_name, flags, data->sha1, &ctx);
+       if (result != FOUND) {
+               switch (result) {
+               case MISSING_OBJECT:
+                       printf("%s missing\n", obj_name);
+                       break;
+               case DANGLING_SYMLINK:
+                       printf("dangling %"PRIuMAX"\n%s\n",
+                              (uintmax_t)strlen(obj_name), obj_name);
+                       break;
+               case SYMLINK_LOOP:
+                       printf("loop %"PRIuMAX"\n%s\n",
+                              (uintmax_t)strlen(obj_name), obj_name);
+                       break;
+               case NOT_DIR:
+                       printf("notdir %"PRIuMAX"\n%s\n",
+                              (uintmax_t)strlen(obj_name), obj_name);
+                       break;
+               default:
+                       die("BUG: unknown get_sha1_with_context result %d\n",
+                              result);
+                       break;
+               }
+               fflush(stdout);
+               return 0;
+       }
+
+       if (ctx.mode == 0) {
+               printf("symlink %"PRIuMAX"\n%s\n",
+                      (uintmax_t)ctx.symlink_path.len,
+                      ctx.symlink_path.buf);
                fflush(stdout);
                return 0;
        }
@@ -333,7 +367,7 @@ static int batch_objects(struct batch_options *opt)
 
 static const char * const cat_file_usage[] = {
        N_("git cat-file (-t [--allow-unknown-type]|-s [--allow-unknown-type]|-e|-p|<type>|--textconv) <object>"),
-       N_("git cat-file (--batch | --batch-check) < <list-of-objects>"),
+       N_("git cat-file (--batch | --batch-check) [--follow-symlinks] < <list-of-objects>"),
        NULL
 };
 
@@ -351,9 +385,8 @@ static int batch_option_callback(const struct option *opt,
 {
        struct batch_options *bo = opt->value;
 
-       if (unset) {
-               memset(bo, 0, sizeof(*bo));
-               return 0;
+       if (bo->enabled) {
+               return 1;
        }
 
        bo->enabled = 1;
@@ -387,6 +420,8 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
                { OPTION_CALLBACK, 0, "batch-check", &batch, "format",
                        N_("show info about objects fed from the standard input"),
                        PARSE_OPT_OPTARG, batch_option_callback },
+               OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
+                        N_("follow in-tree symlinks (used with --batch or --batch-check)")),
                OPT_END()
        };
 
@@ -411,6 +446,10 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
                usage_with_options(cat_file_usage, options);
        }
 
+       if (batch.follow_symlinks && !batch.enabled) {
+               usage_with_options(cat_file_usage, options);
+       }
+
        if (batch.enabled)
                return batch_objects(&batch);