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Old 06-27-2015, 05:08 PM   #1
tamr
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Recommended method(s) to change PATH and define aliases

I know about /etc/profile and I have read lots of forum posts here saying one should avoid making changes to the read-only root file system (and I understand why).

I'm wondering what the recommended and simplest methods are for changing the PATH and defining aliases when logging in to my Kindle over wifi and USBNet?

Ideally I'd like something akin to /etc/profile.d/ but it's not a firm requirement.

I know about bash for Kindle and aliases under BusyBox but I'd like to use whatever capabilities exist with a freshly jailbroken kindle and not have to install other binaries, and if possible avoid modifying the read-only root file system.
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Old 06-27-2015, 05:18 PM   #2
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You are using Bushbox ASH, in case you need to search for details.

Same as any other shell program, just "source", A.K.A ".", a script file having the commands you need to get yourself setup as desired.

Sure, you do have to type the name of that "source filename" shell script.
But that shouldn't be too much work.

(If it is, stop thinking of using the command line for anything, you will be doing a lot of typing.)
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Old 06-27-2015, 09:25 PM   #3
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Thanks, knc1. Yeah, I know Kindle is running ash and that it'll run /etc/profile, and (on the Kindle) /var/tmp/root/.profile. The man pages I found for it weren't geared toward embedded Linux with a read-only rootfs. Based on your reply, am I correct that the Kindle's BusyBox ash has no capability to have something like .profile run off of /mnt/us when I login? That is, I do need to modify /etc/profile after all?
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Old 06-27-2015, 09:40 PM   #4
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no.
just enter:
source /mnt/us/my_setup_script.sh
each time you get a new command line shell (yes, you can login more than once, this is a multi-user system).

of course, you have to provide the content of /mnt/us/my_setup_script.sh (which is the whole point here).
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Old 06-27-2015, 10:08 PM   #5
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I guess I wasn't clear. I'm not looking for a manual method (like handtyping 'source...' after I login) but an automatic one like I can do on other Linux distros. I thought the second link in my original post (aliases under BusyBox) would help explain what I was going for.

I'm experimenting with Scratchbox cross compiling and I'm using the command line a lot on the Kindle, and launching multiple Kindle shell sessions.

Thanks for the replies, though. I'll just change /etc/profile to source something in /mnt/us.
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Old 06-27-2015, 10:33 PM   #6
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USBNet ships w/ zsh, which does expects its zshrc to live in somewhere in us/usbnet/etc (it also ships w/ my own ZSH config), but, again, you'd need to exec zsh at some point (because switching the root shell seems like a terrible idea).

I didn't find any satisfactory way to painlessly automatically use zsh over SSH without touching anything on the Kindle rootfs (though there might be some hints about my attempts in the readme, or at worst in the commit logs).

Last edited by NiLuJe; 06-27-2015 at 10:36 PM.
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Old 06-28-2015, 12:25 AM   #7
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Quote:
Originally Posted by tamr View Post
I guess I wasn't clear.
I'm not looking for a manual method (like handtyping 'source...' after I login) but an automatic one like I can do on other Linux distros.
- - - -
Perhaps I wasn't clear.
If the typing of one command is a deal breaker for you, your in the wrong business.
Go back to a GUI world, the command line environment isn't for you.

- - - -

Plus, check twobob's work, I think he solved your problem case.
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Old 06-28-2015, 01:56 AM   #8
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knc1 -- I don't see why it should be problematic to want to avoid extra typing. Does the average linux distro expect users to manually source their .profile/bashrc/etc? No, so why should it be any different on the Kindle...
If it cannot be done, then that is a shame and perhaps it will need to be done manually... but it isn't at all unreasonable to check!
Or are you saying you manually source setup scripts every single time you open a shell on your computer, out of some atavistic desire to prove your CLI powers?


@tamr -- I don't think there is really any good way to do that on the Kindle, but you could build it into your ssh connection, e.g. :

Code:
ssh -t root@kindle 'source /mnt/us/my_startup_script.sh; sh -i'
Or ideally mechanize it in your ~/.ssh/config


Because scripting was designed to ease repetitive busywork.

Last edited by eschwartz; 06-28-2015 at 02:00 AM.
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Old 06-28-2015, 04:08 AM   #9
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That is probably the wrong end of the connection.

First, setup public key authentication with the Kindle (see the USBnetworking documentation on that - or that ssh thread tutorial I wrote here).

Then that should be the program= option on the public key line in the **Kindle's authorized_keys** file.
(Duh... **not** in my ssh tutorial here, you'll have to go to the 'web for that.)

I am not sure if dropbear sshd (the default in our USBnetworking package) supports the command= option on the public key line in the authorized_keys file, but;
The USBnetworking package also has the openssh sshd included.

Note: the ssh servers in the USBnetworking package are built to use an authorized_keys file in (USB) 'user storage'

- - - - -

The quick and dirty about remote, per key, program execution:

Without this option on a key line (it is per key) in the remote authorized_keys file, the default (for OpenSSH, sshd) is to run: /bin/sh
With this (program= ...) option on a key line, that is what is executed by the remote end (rather than /bin/sh).

man sshd
is really your friend here:
http://linux.die.net/man/8/sshd

Last edited by knc1; 06-28-2015 at 04:27 AM.
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