Don't require that the special/filesystem argument translates into

a block or character device; the rest of tunefs works just fine on
filesystem images in regular files. Instead, if getfsfile() failed
and if the specified filesystem is a directory then print a more
useful "unknown file system" error.

Also, _PATH_DEV already contains a trailing slash, so don't add
another one when constructing a device path, and use errx() instead
of err() in a case where errno is meangingless.

1 files changed, 4 insertions, 5 deletions

diff --git a/sbin/tunefs/tunefs.c b/sbin/tunefs/tunefs.c
index 80f08e0e..7861fd3 100644
--- a/sbin/tunefs/tunefs.c
+++ b/sbin/tunefs/tunefs.c
@@ -210,16 +210,15 @@ again:
 		if (*special != '/') {
 			if (*special == 'r')
 				special++;
-			(void)snprintf(device, sizeof(device), "%s/%s",
+			(void)snprintf(device, sizeof(device), "%s%s",
 				       _PATH_DEV, special);
 			special = device;
 			goto again;
 		}
 		err(1, "%s", special);
 	}
-	if ((st.st_mode & S_IFMT) != S_IFBLK &&
-	    (st.st_mode & S_IFMT) != S_IFCHR)
-		errx(10, "%s: not a block or character device", special);
+	if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR)
+		errx(10, "%s: unknown file system", special);
 	getsb(&sblock, special);
 
 	if (pflag) {
@@ -370,7 +369,7 @@ getsb(fs, file)
 	if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
 		err(4, "%s: bad super block", file);
 	if (fs->fs_magic != FS_MAGIC)
-		err(5, "%s: bad magic number", file);
+		errx(5, "%s: bad magic number", file);
 	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
 }