Re: DEVLINKS and DEVNAME variables in RUN rules

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Tuesday 24 January 2006 22:43, Kay Sievers wrote:
> On Tue, Jan 24, 2006 at 09:05:51PM +0300, Andrey Borzenkov wrote:
> > On Tuesday 24 January 2006 19:24, Olivier Blin wrote:
> > > I'd like to use the DEVNAME and DEVLINKS (thanks Kay) environment
> > > variables in a RUN rule. Unfortunately, they're not exported yet when
> > > the command to be executed is computed (i.e. when the format is
> > > applied). So, for now, I'm using a dumb trick:
> > > RUN+="/bin/sh -c '/sbin/pam_console_setowner $$DEVICE $$DEVNAME
> > > $$DEVLINKS'"
> > >
> > > Would it be possible to have the format applied right before the RUN
> > > command is run?
> >
> > Like this? This seems to work for me:
> >
> > Jan 24 21:04:24 cooker udevd-event[16049]: name_list_add: adding
> > '/sbin/pam_console_setowner $env{DEVICE} $env{DEVNAME} $env{DEVLINKS}'
>
> Applied.
>

OK the following patch documents this difference (and the fact that RUN is 
using substitutons at all). I am still curious if there is real life use for 
something like `PROGRAM="check" RUN="callout %c{1}"'.

regards

- -andrey

Subject: [PATCH] Document when substitutions are applied for RUN and other 
keys

Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>


- ---

 udev.8 |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

333ee12327b6792c9ba7cb75e89786cd8d5a171c
diff --git a/udev.8 b/udev.8
index 8eb63c2..675bb7e 100644
- --- a/udev.8
+++ b/udev.8
@@ -164,10 +164,15 @@ The 
 \fBNAME\fR, 
 \fBSYMLINK\fR, 
 \fBPROGRAM\fR, 
- -\fBOWNER\fR 
- -and 
+\fBOWNER\fR,
 \fBGROUP\fR 
- -fields support simple printf\-like string substitutions:
+and 
+\fBRUN\fR 
+fields support simple printf\-like string substitutions. For \fBRUN\fR they
+are applied immediately before program is launched, after all rules have
+been processed. It allows use of complete environment set up by earlier rules
+including exported variables. For all other fields substitutions are applied
+when rule is being processed. The supported substitutions are:
 .TP
 \fB$kernel\fR, \fB%k\fR
 The kernel name for this device.
- -- 
1.1.4
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