From: lws4art@gmail.com   
      
   Richard Kettlewell wrote:   
   > rsutton  writes:   
   >> Hi all,   
   >> I've been using linux (Ubuntu/Mint mainly) for 20 years and I still   
   >> find things that I don't understand.  I need some help!   
   >>   
   >> I have a need to run the following code after generating a virtual   
   >> machine in LXD.  The following code runs fine in the VM from the   
   >> terminal:   
   >> sudo su -   
   >> mount -t 9p config /mnt   
   >> cd /mnt   
   >> ./install.sh   
   >> exit   
   >>   
   >> However, when I converted the commands to my bash script and try to   
   >> run this code , it fails:   
   >> cd /mnt   
   >   
   > After this your current working directory is the /mnt directory in the   
   > root filesystem.   
   >   
   >> sudo mount -t 9p config /mnt   
   >   
   > After the mount command, the path /mnt refers to the root of the 9p   
   > filesystem (whatever that is). But your current working directory   
   > remains the (now hidden) /mnt directory of the root filesystem.   
   >   
   > So the answer is to move the ‘cd’ command in your script one line down.   
   >   
   >> sudo /mnt/install.sh   
   >>   .   
   >>   .   
   >>   
   >> The error it gives me is:   
   >> "This script must be run from within the 9p mount"   
   >   
      
   To further expand on what Richard here said, the hint was in the   
   differences in OP's original post. When he did it step by step by   
   command line he cd into mounted dir before running install.sh whereas hi   
   script did not.   
      
   The install.sh script must reference assets within the same directory as   
   the script AND the script assumes the pwd is that directory.   
      
   If you are the author of install.sh, what I do to prevent this problem   
   in my scripts:   
      
   SCRIPT_PATH="$(dirname "$(realpath "$0")")"   
   # reference some asset located with this script   
   source "$SCRIPT_PATH/some_asset"   
   # or alternatively cd to script directory first   
   cd $SCRIPT_PATH"   
   source ./some_other_asset   
      
      
   --   
   Take care,   
      
   Jonathan   
   -------------------   
   LITTLE WORKS STUDIO   
   http://www.LittleWorksStudio.com   
      
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