Sourcing a file in a script

Hi all,

So I have a short bash script written with the goal of being able to download a zip folder containing credentials for a software program, unzip them and source them. Unfortunately the sourcing is not taking place, or if it is, it only lasts during the execution of the script and not outside it. Problem is I need it to be effective outside of the script. So, the script looks like so:

get-creds.sh

#!/bin/bash

yum install unzip -y
mkdir .creds
cd .creds
/usr/sbin/euca_conf --get-credentials admin.zip
unzip admin.zip
source eucarc
cd

I execute it from the terminal like so: ./folder/folder/folder/get-creds.sh

how can I set up the script so that that source command works outside the script as well? The credentials file needs to be sourced to run some commands and I want it as automated as possible.

Thanks

Do the creds change from download to download?
If not, just leave eucarc somewhere (one directory above?) and use source /path/to/eucarc
in your ~/.bashrc file.

basically, you can't

once the bash script exits, its environment is 'lost'

However..

instead of using a script, add a function

in your ~/.bashrc

get-creds () {
yum install unzip -y
mkdir .creds
pushd .creds
    /usr/sbin/euca_conf --get-credentials admin.zip
    unzip admin.zip
    source eucarc
popd
}

source your ~/.bashrc ( new shell is automatic )
then type

get-creds

Warning:
I didn't fix your script

• yum will fail if not root
• yum may run needlessly
• .creds is created in current dir

check if you already have unzip

[[ -x $(which unzip) ]] || sudo yum install unzip -y

consider a tempdir ( does .creds need to hang around? )

TempDir=$(mktemp -d)
pushd $TempDir
   .. do stuff
popd
rm -r $TempDir # cleanup
unset $TempDir # cleanup

Yes the creds will change from download to download.

The script will be run as the initial install, users may need to source the cred file again at a later point manually if they exit the terminal/close the remote session or whatever. Or if for some reason the programs database needs overwritten new credentials will have to be downloaded and sourced. The path however will not change, unless the user messes up and puts it somewhere else in the scenario that they need to be redownloaded.

Originally Posted by Firerat basically, you can't once the bash script exits, its environment is 'lost' However.. instead of using a script, add a function in your ~/.bashrc get-creds () { yum install unzip -y mkdir .creds pushd .creds /usr/sbin/euca_conf --get-credentials admin.zip unzip admin.zip source eucarc popd } source your ~/.bashrc ( new shell is automatic ) then type get-creds Warning: I didn't fix your script yum will fail if not root yum may run needlessly .creds is created in current dir check if you already have unzip [[ -x $(which unzip) ]] || sudo yum install unzip -y consider a tempdir ( does .creds need to hang around? ) TempDir=$(mktemp -d) pushd $TempDir .. do stuff popd rm -r $TempDir # cleanup unset $TempDir # cleanup

I'm not sure that will work for my scenario. These scripts are supposed to be part of an install suite that will make the installation process of some bundled software more simple for the people we distribute it to...unless I create a script that modifies or overwrites the bashrc with a version matching what I'd need it to look like. Also, yes the .creds directory needs to stick around permanently.

Originally Posted by TenaciousRock I'm not sure that will work for my scenario. These scripts are supposed to be part of an install suite that will make the installation process of some bundled software more simple for the people we distribute it to...unless I create a script that modifies or overwrites the bashrc with a version matching what I'd need it to look like. Also, yes the .creds directory needs to stick around permanently.

use your imagination

wow.

I shall use my imagination then

#!/bin/bash

BaseCamp=$HOME/.YourCompany
CredDir=${BaseCamp}/creds
SourceFile=${BaseCamp}/.SomeNamerc

[[ ! -d "$BaseCamp" ]] && mkdir "$BaseCamp"
[[ -x $(which unzip) ]] || \
    (
       echo "unzip utility required , please install"
       echo "yum install unzip -y"
       # be more verbose with your msg
       exit 1
    ) 
[[ ! -d "$CredDir" ]] && mkdir "$CredDir"

[[ ! -e "$SourceFile" ]] && \
    (
       cat > $SourceFile <<-END
	get-creds () {
	pushd $HOME/.YourCompany/creds
	    /usr/sbin/euca_conf --get-credentials admin.zip
	    unzip -qq -o admin.zip
	    source eucarc
	popd # echo some message
	}
	[[ -e $HOME/.YourCompany/creds/eucarc ]] \
	    && source $HOME/.YourCompany/creds/eucarc \
	    || get-creds
	END
    ) ######
      # http://mywiki.wooledge.org/BashGuide/InputAndOutput
      # Heredocs And Herestrings, I used tabs..
      ####

grep -q "$SourceFile" $HOME/.bashrc || \
    (
      echo "source $SourceFile" >> $HOME/.bashrc
      echo "some message about source file install"
      echo "message on use ( how to call the function(s) )"
    )
# end install script
# an example, you know the requirements better than i do

Warning:
basic script, no real error checks

http://www.tldp.org/LDP/Bash-Beginners-Guide/html/
http://www.tldp.org/LDP/abs/html/
http://mywiki.wooledge.org/BashGuide
http://www.gnu.org/software/bash/manual/bashref.html

Yeah that is way over my head lol

thanks

If you want to make life easy for your clients you will need to learn some scripting


looking back I would change the cat > $SourceFile <<-END

       cat > $SourceFile <<-END
	[[ -e $HOME/.YourCompany/creds/eucarc ]] \
	    || (
	          mkdir $HOME/.YourCompany/creds 2>/dev/null
	          pushd $HOME/.YourCompany/creds
	              /usr/sbin/euca_conf --get-credentials admin.zip
	              unzip -qq -o admin.zip
	          popd # echo some message
	       )
	source $HOME/.YourCompany/creds/eucarc
	END

but as well as needing to be more robust ( check for errors )
it should also include an uninstall function, to cleanup the users ~/.bashrc and so on