Date: Tue, 16 Feb 2016 12:00:59 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: =?utf-8?Q?Edward_Tomasz_Napiera=C5=82a?= <trasz@FreeBSD.org> Cc: "hackers@freebsd.org" <hackers@freebsd.org> Subject: Re: autofs problem Message-ID: <6FFA90F6-7870-40B6-8BDE-281B899B62D7@cs.huji.ac.il> In-Reply-To: <20160215214159.GA6160@brick.home> References: <39973B1A-BBB9-4CB7-B352-A42C14B61E0F@cs.huji.ac.il> <20160215214159.GA6160@brick.home>
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> On 15 Feb 2016, at 23:41, Edward Tomasz Napiera=C5=82a = <trasz@FreeBSD.org> wrote: >=20 > On 0214T1655, Daniel Braniss wrote: >> Hi, >> I=E2=80=99m converting our (very) old am-utils maps to use the new = autofs, >> so I wrote a python script that queries the am-utils map, and = =E2=80=98generates=E2=80=99 >> one that autofs likes. >> so autofs_master has: >> =E2=80=A6 >> /cs auto_cs >>=20 >> auto_cs is a python script and is executable. >>=20 >> at the moment I=E2=80=99m stuck with what am-utils type=3Dlink >> so I=E2=80=99m using -fstype=3Dnullfs :/cs/some-path, but before this = can work I need >> to trigger autofs with the /cs/some-path, so before the script = returns I do a >> os.stat('/cs/some-path') >> but this returns an error, mainly because it is not caught by autofs! >> doing the same in the command line works, and later the nullfs too, = (i=E2=80=99m afraid >> of what the auto unmount will do later, but that=E2=80=99s another = issue) >>=20 >> is this by design? or is there some better way? >=20 > It's by design - basically, autofs(4) has code to explicitly disable = triggering > by anything running with the same SID (session id) as the = automountd(8). This > is to prevent some obvious (and some less than obvious and quite hard = to debug) > deadlocks. Thus, any script ran by automountd(8) works as if the = autofs mounts > "weren't there". >=20 > You might be able to work around this by somehow calling setsid() from > the Python script before triggering. bingo!, that did it thanks, danny
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