fsck: improve committer/author check

fsck allows a name with > character in it like "name> <email>". Also for
"name email>" fsck says "missing space before email".

More precisely, it seeks for a first '<', checks that ' ' preceeds it.
Then seeks to '<' or '>' and checks that it is the '>'. Missing space is
reported if either '<' is not found or it's not preceeded with ' '.

Change it to following. Seek to '<' or '>', check that it is '<' and is
preceeded with ' '. Seek to '<' or '>' and check that it is '>'. So now
"name> <email>" is rejected as "bad name". More strict name check is the
only change in what is accepted.

Report 'missing space' only if '<' is found and is not preceeded with a
space.

Signed-off-by: Dmitry Ivankov <divanorama@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

fsck.c

@@ -224,13 +224,15 @@ static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
 
 static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
 {
-	if (**ident == '<' || **ident == '\n')
+	if (**ident == '<')
-		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
-	*ident += strcspn(*ident, "<\n");
-	if ((*ident)[-1] != ' ')
 		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
+	*ident += strcspn(*ident, "<>\n");
+	if (**ident == '>')
+		return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
 	if (**ident != '<')
 		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
+	if ((*ident)[-1] != ' ')
+		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
 	(*ident)++;
 	*ident += strcspn(*ident, "<>\n");
 	if (**ident != '>')

t/t1450-fsck.sh

@@ -110,7 +110,7 @@ test_expect_success 'email with embedded > is not okay' '
 	grep "error in commit $new" out
 '
 
-test_expect_failure 'missing < email delimiter is reported nicely' '
+test_expect_success 'missing < email delimiter is reported nicely' '
 	git cat-file commit HEAD >basis &&
 	sed "s/<//" basis >bad-email-2 &&
 	new=$(git hash-object -t commit -w --stdin <bad-email-2) &&
@@ -122,7 +122,7 @@ test_expect_failure 'missing < email delimiter is reported nicely' '
 	grep "error in commit $new.* - bad name" out
 '
 
-test_expect_failure 'missing email is reported nicely' '
+test_expect_success 'missing email is reported nicely' '
 	git cat-file commit HEAD >basis &&
 	sed "s/[a-z]* <[^>]*>//" basis >bad-email-3 &&
 	new=$(git hash-object -t commit -w --stdin <bad-email-3) &&
@@ -134,7 +134,7 @@ test_expect_failure 'missing email is reported nicely' '
 	grep "error in commit $new.* - missing email" out
 '
 
-test_expect_failure '> in name is reported' '
+test_expect_success '> in name is reported' '
 	git cat-file commit HEAD >basis &&
 	sed "s/ </> </" basis >bad-email-4 &&
 	new=$(git hash-object -t commit -w --stdin <bad-email-4) &&