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    how to build blktap from sources?

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    • olivierlambertO Offline
      olivierlambert Vates 🪐 Co-Founder CEO
      last edited by

      It's now done 🙂

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      • stormiS Offline
        stormi Vates 🪐 XCP-ng Team @r1
        last edited by stormi

        @r1 Why is centos-release-xen.x86_64 needed?

        Also, I found out that in order for blktap to build, I had to install kernel-headers from a rebuilt kernel from the source RPM from XS source ISO. It won't work with stock centos kernel, at least not when starting the container with "docker run" rather than "./run.py" (the latter adds a useful repository containing build dependencies for most xenserver-related packages, but its contents is evolving as development continues, so in order to build packages for XCP-ng 7.5, I prefer to avoid relying on it. And of course the similar build repository for the branch that corresponds to XS 7.5 is internal to Citrix only).

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        • R Offline
          r1 XCP-ng Team
          last edited by r1

          @stormi I had discussion on GitHub with Citrix dev who recommended to use either latest kernel headers or one can use them from a rebuilt kernel. Rebuilt kernel headers is the right way to do this.

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          • borzelB Offline
            borzel XCP-ng Center Team
            last edited by borzel

            Can you provide a bit more info, how to do it?

            I managed to build the package, but it was not the right version and with the wrong headers. Do you have something like a commandlist to give me some hints?

            I'm playing around with ZFS and would build my own blktap-package to modify and test some things.

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            • nraynaudN Offline
              nraynaud XCP-ng Team
              last edited by

              Yes, it's quite complicated.

              You need xenserver-build-env, and a repo of someone else's already compiled RPMs.

              I added the repo to my Dockerfile:
              COPY xcp-ng.repo /etc/yum.repos.d/xcp-ng-base.repo

              Then I created a launch script:

              #!/usr/bin/env bash
              
              (cd ../blktap && git diff 41bdd82242104ecea3f654f12704fe8122dfdf41 ) > nr-remove-odirect.patch
              docker build -t xenserver/xenserver-build-env .
              python run.py -v `pwd`:/builddir -v `pwd`/repo-7.4:/repo-7.4 -s /Volumes/7.4.0\ Source/SPackages/blktap-3.5.0-1.12.src.rpm /builddir/build-blktap-inside-docker.sh
              

              build-blktap-inside-docker.sh is here:

              #!/usr/bin/env bash
              
              set -ex
              
              sudo yum -y remove kernel-headers
              sudo rpm -ivh /repo-7.4/x86_64/kernel-headers-4.4.52-3.2.2.x86_64.rpm
              rpm -ivh local-SRPMs/blktap-3.5.0-1.12.src.rpm
              sudo yum-builddep -y blktap
              
              cp /builddir/nr-remove-odirect.patch rpmbuild/SOURCES/
              cp /builddir/blktap.spec rpmbuild/SPECS/
              rpmbuild -ba rpmbuild/SPECS/blktap.spec
              cp rpmbuild/RPMS/x86_64/blktap-3.5.0-1.12test.x86_64.rpm /builddir
              

              The specfile just has a patch added and its version changed:

              Patch54: nr-remove-odirect.patch
              

              good luck.

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              • borzelB Offline
                borzel XCP-ng Center Team
                last edited by

                hui ... will try that ...

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                • borzelB Offline
                  borzel XCP-ng Center Team
                  last edited by

                  @nraynaud said in how to build blktap from sources?:

                  repo-7.4

                  whats inside this directory? content of the XenServer 7.4 source iso?

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                  • borzelB Offline
                    borzel XCP-ng Center Team
                    last edited by

                    ahh... maybe this? https://updates.xcp-ng.org/7/dev/builddeps/x86_64/Packages/

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                    • borzelB Offline
                      borzel XCP-ng Center Team
                      last edited by

                      ok, got it working! my own blktap is running 🙂 Thanks for your help!

                      nraynaudN 1 Reply Last reply Reply Quote 0
                      • nraynaudN Offline
                        nraynaud XCP-ng Team @borzel
                        last edited by

                        @borzel sorry, I missed your question, glad you got it working.

                        what changes are you making?

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                        • borzelB Offline
                          borzel XCP-ng Center Team
                          last edited by borzel

                          First just playing around to get knowledge of this, maybe I find some usefull things. Don't know exactly, but I want to understand a bit more what I'm using here.

                          Can sometimes be handy to know such things. Everytime I learned something I was using it later at work or privat 🙂

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                          • olivierlambertO Offline
                            olivierlambert Vates 🪐 Co-Founder CEO
                            last edited by

                            Good idea 🙂 We are glad to have more potential contributors on board. More the XCP-ng knowledge is spread, better the community!

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                            • R Offline
                              r1 XCP-ng Team
                              last edited by

                              @borzel Congratulations! And I can relate to the feeling 🙂

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                              • stormiS Offline
                                stormi Vates 🪐 XCP-ng Team
                                last edited by stormi

                                There's now a new and reproducible way to build blktap in a clean environment:

                                https://github.com/xcp-ng/xcp-ng-build-env

                                I will not copy the readme here, but basically, you can do something like that:

                                Preparation

                                # create the build image, target current dev branch of XCP-ng (which is the future 7.5)
                                # There's no support for 7.4 because of different repository structure and missing devel packages
                                # You need to do it just once, though doing it from time to time won't hurt.
                                ./build.sh dev
                                
                                # create an useful alias for later. You should probably add it to you .bashrc so that it stays
                                # The --rm part is not mandatory but I find it useful to keep docker's disk usage low.
                                alias xcp-build="$(pwd)/run.py --rm"
                                

                                Build

                                Here I'll show you how to build from our new git repositories. Not all packages are present there, but blktap is and this is a good occasion to make you become accustomed to using them since that's where we'll commit patches and also experimental stuff.

                                # from the directory of your choice...
                                git clone https://github.com/xcp-ng-rpms/blktap.git # or a forked version if you intend to send pull requests
                                cd blktap
                                # ... here make changes... or not...
                                # use our shiny new alias to build it
                                xcp-build --build-local . # or simply 'xcp-build -l .'
                                

                                The resulting built RPMs will be in the SRPMS and RPMS subdirectories of your git working directory.

                                Just tested with blktap. If it fails at building another package, open a separate thread and I'll try to fix it.

                                Bonus: build with experimental changes applied

                                Our blktap package can be built with an experimental patch for better ZFS support. Build it this way:

                                xcp-build --build-local . --define 'xcp_ng_section extras'
                                
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                                • borzelB Offline
                                  borzel XCP-ng Center Team
                                  last edited by borzel

                                  If someone fails to build, maybe the git-lfs in not properly initialised. To fetch the lfs-files after git clone you can do a git lfs fetch.
                                  weird ... after the second time installing git-lfs and again cloning the repo, it worked... 😮

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