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    Post Download Scripts - Not Executing

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    • Tom ElliottT
      Tom Elliott
      last edited by

      Sorry to spam, but I do need to say it.

      I think your postdownload script was operating properly, though I’ve not tested it myself.

      You are trying to edit /etc/fstab and as @mrayzies stated, this is the in memory filesystem, not the filesystem of which you’re trying to fix.

      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

      Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

      Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

      1 Reply Last reply Reply Quote 0
      • D
        dholtz-docbox @Tom Elliott
        last edited by

        @Tom-Elliott : That makes sense, regarding the mount. This was also true for the values returned by my CURRENT assignment, via. blkid, where its UUID also did not reflect the host machine’s swap UUID. What I am interested in now is what you mentioned about removing the UUID for the swap and defining it for the partition itself. Would you mind elaborating on this a little for me? I am digging around trying to understand more about how to configure this, and I feel you are hinting on something similar to where I should be headed.

        The image I am handling by-the-way, currently, is just an Ubuntu 14.04 desktop installation. So I have done nothing special to it other than install it, shut the machine down, and capture its image. I figured this would be the best starting place for a lot of things, but it is starting to sound like that is a loaded gun. That I need to configure a few things at a minimum to ensure subsequent images are deployed more smoothly?

        -Dustin

        Tom ElliottT 1 Reply Last reply Reply Quote 0
        • Tom ElliottT
          Tom Elliott @dholtz-docbox
          last edited by

          @dholtz-docbox I need to see the fstab in question, but typically the UUID is used as the “reference” to the device/partition what have you.

          So instead of setting fstab for swap as:

          UUID=SOME-UUID-HERE swap swap defaults 0 0

          You could set as:
          /dev/sda2 swap swap defaults 0 0

          Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

          Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

          Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

          D 1 Reply Last reply Reply Quote 1
          • D
            dholtz-docbox @Tom Elliott
            last edited by dholtz-docbox

            @Tom-Elliott :

            Each of our machines look similar to…

            # / was on /dev/nvme0n1p2 during installation
            UUID=61d640da-5df9-4a71-b6bc-cc28d8a8c9c8 /               ext4    errors=remount-ro 0       1
            # /boot/efi was on /dev/nvme0n1p1 during installation
            UUID=030B-0954  /boot/efi       vfat    defaults        0       1
            # swap was on /dev/nvme0n1p3 during installation
            UUID=f0207d3c-a9b2-492e-93ca-fe37a59473d6 none            swap    sw              0       0
            

            Are you saying that I can just change these to…

            # / was on /dev/nvme0n1p2 during installation
            /dev/nvme0n1p2 /               ext4    errors=remount-ro 0       1
            # /boot/efi was on /dev/nvme0n1p1 during installation
            /dev/nvme0n1p1  /boot/efi       vfat    defaults        0       1
            # swap was on /dev/nvme0n1p3 during installation
            /dev/nvme0n1p3 none            swap    sw              0       0
            

            … and be good-to-go? Then image with the drives labeled as such, instead? I have been looking around for more details on doing something like this, but all I can find are people who lost their drives UUID and need to re-assign it. It’s overwhelming the amount of issues people have in simply manually assigning it, it really drowns out any other questions about fstab and what you can do with it and when.

            -Dustin

            Tom ElliottT 1 Reply Last reply Reply Quote 0
            • Tom ElliottT
              Tom Elliott @dholtz-docbox
              last edited by

              @dholtz-docbox Yes, you should be good to go. Now I don’t know which partition is which.

              One of the things FOG does automatically though, is reset the UUID to match of what the OS was expecting. So I don’t know why you need to change the UUID to begin with.

              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

              Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

              Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

              1 Reply Last reply Reply Quote 0
              • M
                mrayzies
                last edited by

                @dholtz-docbox

                For this image, what do you have defined for “Image Type” and “Partition”? Perhaps you have something misconfigured here which is why the UUID of the SWAP space is not set properly?

                I’d guess that you should have “Multiple Partition Image - Single Disk (Not Resizable) - (2)” and “Everything - (1)” respectively.

                D 1 Reply Last reply Reply Quote 0
                • D
                  dholtz-docbox @mrayzies
                  last edited by

                  @mrayzies :

                  Oh. My. Gosh. I have been using Single Disk - Resizable this whole time! I thought this was the correct configuration, one DRIVE, which is resizable for each partition. When did this change, out of curiosity? When I first downloaded the FOG Project, I swear the multiple partition selection did not exist. This has me wicked excited! I was just about to go home too. Time for one more test!

                  -Dustin

                  1 Reply Last reply Reply Quote 0
                  • george1421G
                    george1421 Moderator @mrayzies
                    last edited by

                    @mrayzies You came to the same conclusion I did (as I was finishing mowing the grass tonight, and still thinking about this issue). The fstab being empty is on the FOS Engine linux OS, that I can understand. Your mount command is needed to connect to the target’s local hard drive (which is not mounted automatically by FOS). We have to do this if we want to tweak the unattend.xml in the windows realm of the post install scripts.

                    Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

                    1 Reply Last reply Reply Quote 0
                    • D
                      dholtz-docbox
                      last edited by

                      Testing this today - had to leave work last night. I am hoping this will solve it. It feels promising, heh.

                      -Dustin

                      1 Reply Last reply Reply Quote 0
                      • Tom ElliottT
                        Tom Elliott @dholtz-docbox
                        last edited by Tom Elliott

                        @dholtz-docbox said in Post Download Scripts - Not Executing:

                        Server
                        • FOG Version: 1.3.0-rc11
                        • OS: Ubuntu 14.04
                        Description

                        I am near the end of what I need from the FOG project, and everything seems to be functioning pretty solid so far. However, I am having issues kicking off post download scripts.

                        I have followed the following two articles to no success…

                        • https://forums.fogproject.org/topic/7740/the-magical-mystical-fog-post-download-script-under-construction/3
                        • https://wiki.fogproject.org/wiki/index.php/Auto_driver_Install

                        My /images/postdownloadscripts/fog.postdownload looks like…

                        #!/bin/sh
                        
                        . ${postdownpath}update_swap_uuid.sh
                        

                        And update_swap_uuid.sh looks like…

                        #!/bin/bash
                        
                        ORIGINAL=$(grep -v '#' /etc/fstab | grep swap | cut -d ' ' -f1 | cut -d '=' -f2)
                        CURRENT=$(blkid | grep 'swap' | cut -d ' ' -f2 | cut -d '"' -f2)
                        TIME=$(date +%Y%m%d%H%M%S)
                        
                        if [ "$ORIGINAL" = "$CURRENT" ];
                        then
                          exit
                        fi
                        
                        # NOTE: Backup 'fstab'
                        cp /etc/fstab "/etc/fstab.$TIME.backup"
                        
                        # NOTE: Overwrite ORIGINAL with CURRENT swap UUID
                        sed -i -e "s/$ORIGINAL/$CURRENT/g" /etc/fstab
                        

                        I have had no issues using the update script itself, so I am not sure why FOG would have an issue with it.

                        I have also given ‘755’ rights to the whole postdownloadscripts/ directory.

                        Am I forgetting something or doing something incorrectly? I have tried little permutations of editing the fog.postdownload and update scripts, as well as hunting for settings and permissions to allow access to these contents.

                        Also, where would I look for any indication that these are being run? I have looked very closely through the entire process and have seen no output text about running this particular region of scripts.

                        Many thanks for your time!

                        -Dustin

                        You can change your update_swap_uuid.sh to something like:

                        #!/bin/bash
                        # First we need to get the partitions of this disk (typically $hd in resize or single disk nonresize)
                        getPartitions "$hd"
                        # Now to iterate the parts
                        for part in $parts; do
                             # Print a nice message
                             dots "Mounting partition $part"
                             # Attempt the mount
                             mount $part /mnt >/dev/null 2>&1
                             # It didn't mount, inform and start at top
                             if [[ ! $? -eq 0 ]]; then
                                 echo "Failed to mount the partition"
                                 continue
                             fi
                             # Test to see if fstab exists on this part
                             # If not un-mount the directory and print the message for the user and start from top of loop
                             if [[ ! -f /mnt/etc/fstab ]]; then
                                 umount /mnt
                                 echo "Done, fstab not on this partition"
                                 continue
                             fi
                             # File was found
                             echo "Done"
                             # Let the user know what is happening
                             dots "Checking and updating swap UUID"
                             # Get the fstab uuid currently setup
                             ORIGINAL=$(grep -v '#' /mnt/etc/fstab | grep swap | cut -d ' ' -f1 | cut -d '=' -f2)
                             # Get the current real partition swap
                             CURRENT=$(blkid | grep 'swap' | cut -d ' ' -f2 | cut -d '"' -f2)
                             # Get the current date/time
                             TIME=$(date +%Y%m%d%H%M%S)
                        
                             # Check if the original is the same as the current if so
                             # if so, unmount and inform start at top
                             if [[ $ORIGINAL == $CURRENT ]]; then
                                 umount /mnt
                                 echo "Done, UUID unchanged"
                                 continue
                             fi
                        
                             # NOTE: Backup 'fstab'
                             cp /mnt/etc/fstab "/mnt/etc/fstab.$TIME.backup"
                        
                             # NOTE: Overwrite ORIGINAL with CURRENT swap UUID
                             sed -i -e "s/$ORIGINAL/$CURRENT/g" /mnt/etc/fstab >/dev/null 2>&1
                             # If the sed fails inform, un-mount, start at top
                             if [[ ! $? -eq 0 ]]; then
                                 echo "Failed to update file"
                                 umount /mnt
                                 continue
                            fi
                            # All succeeded inform and unmount
                            echo "Done, UUID updated"
                            umount /mnt
                        done
                        

                        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                        D 1 Reply Last reply Reply Quote 0
                        • D
                          dholtz-docbox
                          last edited by

                          Setting the image to “Multiple Partition Image - Single Disk (Not Resizable) - (2)” did not work either.

                          I guess what stumps me is why I am having this issue, or what I need to do to avoid it. There isn’t even anything special about the drive I am imaging, it’s just a fresh installation of Ubuntu 14.04 Desktop. How do you guys generally configure your swap partition? Linux needs this swap partition, so it is awkward to me that I am not seeing more resources on this issue while having received it so easily.

                          I am trying to avoid the post download scripts solution at the moment, and am looking into other ways of configuring the system before imaging. At the moment, I have tried just using the physical name in lieu of the UUID for the swap drive and am testing this as I write this.

                          I will continue posting my progress.

                          -Dustin

                          1 Reply Last reply Reply Quote 0
                          • D
                            dholtz-docbox @Tom Elliott
                            last edited by

                            @Tom-Elliott :

                            Oh, that’s awesome! I am still learning how to do more with the system through shell scripts, so this is very cool to read through. I will update my current script to reflect this and give it a whirl. It might not be the best solution, but I can figure out another solution if this one works for this particular milestone.

                            -Dustin

                            Tom ElliottT 1 Reply Last reply Reply Quote 0
                            • Tom ElliottT
                              Tom Elliott @dholtz-docbox
                              last edited by

                              @dholtz-docbox I’m only looping the found partitions to make things a bit more dynamic. But if you know the FOS system recognizes the disk as /dev/sda and you also know the root etc/fstab will be on partition 1, you can forgo the loop and simply mount the /dev/sda1 and make your edits directly.

                              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                              Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                              Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                              D 1 Reply Last reply Reply Quote 0
                              • D
                                dholtz-docbox @Tom Elliott
                                last edited by

                                @Tom-Elliott : What is the best way for me to learn what I can do in the FOS? I couldn’t locate a primary resource on the FOG wiki regarding it and its available functionality. I wouldn’t mind knowing more about how people use this side of FOG, it is starting to feel like it’s the strongest tool in the whole arsenal.

                                Also, I was able to capture + deploy the image fine if I used the physical partitions name in lieu of the UUID.

                                /dev/sda5, none, swap, sw, 0, 0
                                

                                My primary concern in this solution is the what-if scenario. Should I be concerned about whether this link will change on its own? That would be my primary concern, correct? Someone changing the sym-link between /dev/sda5 and its underlying UUID?

                                Thanks for going back-and-forth with me on this. I don’t have a lot of people to talk with about topics like this.

                                -Dustin

                                Tom ElliottT 1 Reply Last reply Reply Quote 0
                                • Tom ElliottT
                                  Tom Elliott @dholtz-docbox
                                  last edited by

                                  @dholtz-docbox You’re absolutely right that postdownload scripts is a very powerful tool. It can also be very destructive, but “with great power comes great responsibility…” or something like that.

                                  Essentially, postdownload scripts can be ANYTHING you want them to be. They have the power to iterate over the freshly imaged system to change whatever you may need, however you may need to do it.

                                  Yes, links can change, but chances are you’ll know of those changes the first time you go to work with them. With post download scripts, you can modify EVERYTHING, even HOW the scripts run. For example, on the fog.postdownload you can add if statements to do different things based on whatever you deem necessary. You don’t, necessarily, even need to just source your own scripts, you could just script it directly in the fog.postdownload script. I prefer separating my scripts for modularity reasons.

                                  I don’t mind giving input here and there as it helps EVERYBODY.

                                  Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                                  Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                  Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                  1 Reply Last reply Reply Quote 1
                                  • D
                                    dholtz-docbox
                                    last edited by dholtz-docbox

                                    I had to table these efforts, as I have been unable to successfully clone and deploy an extended linux image without having the swap drive hiccup during the cloning/imaging process. I will return to this as soon as time permits, but I have a few tentative workarounds for this milestone.

                                    -Dustin

                                    1 Reply Last reply Reply Quote 0
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