linux-kernel - [patch] Make initramfs printk a warning on incorrect cpio type

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Date:	Sat, 04 Nov 2006 23:25:15 +0100
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	viro@...iv.linux.org.uk, akpm@...l.org
Subject: [patch] Make initramfs printk a warning on incorrect cpio type

It turns out that the "-c" option of cpio is highly unportable even
between distros let alone unix variants, and may actually make the wrong
type of cpio archive. I just wasted quite some time on this, and the
kernel can detect this and warn about it (it's __init memory so it gets
thrown away and thus there is no runtime overhead)

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>

--- linux-2.6.18/init/initramfs.c.old	2006-11-04 23:18:30.000000000 +0100
+++ linux-2.6.18/init/initramfs.c	2006-11-04 23:19:19.000000000 +0100
@@ -182,6 +182,10 @@ static int __init do_collect(void)
 
 static int __init do_header(void)
 {
+	if (memcmp(collected, "070707", 6)==0) {
+		error("incorrect cpio method used: use -H newc option");
+		return 1;
+	}
 	if (memcmp(collected, "070701", 6)) {
 		error("no cpio magic");
 		return 1;

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