add more informative error messages to git-mktag

Signed-off-by: Björn Engelmann <BjEngelmann@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/mktag.c b/mktag.c
index f1598dbd215811ead04d4f02c4d29012db699ac9..f0fe5285b24d5a19c7d41b437a18a3851ae90802 100644 (file)
--- a/mktag.c
+++ b/mktag.c
@@ -46,41 +46,45 @@ static int verify_tag(char *buffer, unsigned long size)
        const char *object, *type_line, *tag_line, *tagger_line;
 
        if (size < 64)
-               return -1;
+               return error("wanna fool me ? you obviously got the size wrong !\n");
+
        buffer[size] = 0;
 
        /* Verify object line */
        object = buffer;
        if (memcmp(object, "object ", 7))
-               return -1;
+               return error("char%d: does not start with \"object \"\n", 0);
+
        if (get_sha1_hex(object + 7, sha1))
-               return -1;
+               return error("char%d: could not get SHA1 hash\n", 7);
 
        /* Verify type line */
        type_line = object + 48;
        if (memcmp(type_line - 1, "\ntype ", 6))
-               return -1;
+               return error("char%d: could not find \"\\ntype \"\n", 47);
 
        /* Verify tag-line */
        tag_line = strchr(type_line, '\n');
        if (!tag_line)
-               return -1;
+               return error("char%td: could not find next \"\\n\"\n", type_line - buffer);
        tag_line++;
        if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n')
-               return -1;
+               return error("char%td: no \"tag \" found\n", tag_line - buffer);
 
        /* Get the actual type */
        typelen = tag_line - type_line - strlen("type \n");
        if (typelen >= sizeof(type))
-               return -1;
+               return error("char%td: type too long\n", type_line+5 - buffer);
+
        memcpy(type, type_line+5, typelen);
        type[typelen] = 0;
 
        /* Verify that the object matches */
        if (get_sha1_hex(object + 7, sha1))
-               return -1;
+               return error("char%d: could not get SHA1 hash but this is really odd since i got it before !\n", 7);
+
        if (verify_object(sha1, type))
-               return -1;
+               return error("char%d: could not verify object %s\n", 7, sha1);
 
        /* Verify the tag-name: we don't allow control characters or spaces in it */
        tag_line += 4;
@@ -90,14 +94,14 @@ static int verify_tag(char *buffer, unsigned long size)
                        break;
                if (c > ' ')
                        continue;
-               return -1;
+               return error("char%td: could not verify tag name\n", tag_line - buffer);
        }
 
        /* Verify the tagger line */
        tagger_line = tag_line;
 
        if (memcmp(tagger_line, "tagger", 6) || (tagger_line[6] == '\n'))
-               return -1;
+               return error("char%td: could not find \"tagger\"\n", tagger_line - buffer);
 
        /* The actual stuff afterwards we don't care about.. */
        return 0;