Date: Mon, 20 Nov 2017 09:36:56 -0600 From: Karl Denninger <karl@denninger.net> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: MSDOS Filesystem question related to "read-only" files Message-ID: <f4ccb904-63fd-4641-89c8-09357fbb5a1c@denninger.net>
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This is a cryptographically signed message in MIME format. --------------ms040008050806070601010508 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I'm running into an interesting issue here and wondering if there's a way to do this under FreeBSD. MSDOS filesystems have a "primitive" permission capability; specifically, they can have a "Read-only" attribute on a file.=C2=A0 It l= ooks like OpenBSD supports this from reading their man pages. FreeBSD doesn't appear to.=C2=A0 When you mount a msdos filesystem (e.g. = a USB stick) whoever owns the parent directory where you mount it gives you the permissions and "ownership" of files on said filesystem.=C2=A0 Al= l good so far.=C2=A0 But attempting to chmod a file to remove write permiss= ion "succeeds" (returns success) but does nothing. Is this capability simply not present on FreeBSD?=C2=A0 I'm interested in= using it as a means of "flagging" files on a USB stick in an application that I do not want to remove if the stick fills (basically, to "protect" them from being aged off) and it appears there's no way to do it, other than to use something unique in the filename that I would then have to pay attention to. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms040008050806070601010508 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw 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