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  1. RHEL
  2. RHEL-52240

[RHEL EPIC] Create --compat-volumes option to Build and Farm Build - RHEL 10.0 Beta

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    • Create --compat-volumes option to Build and Farm Build - RHEL 9.5
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      • The command works as documented.
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      The following needs to be verified in order for this epic to be considered complete: The command works as documented.
    • rhel-sst-container-tools
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    • QE ack, Dev ack, Docs ack, PXE ack
    • Enhancement
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      .The `--compat-volumes` option is available for Podman and Buildah

      You can use the new `--compat-volumes` option with the `buildah build`, `podman build`, and `podman farm build` commands.
      This option triggers special handling for the contents of directories marked using the `VOLUME` instruction such that their contents can subsequently only be modified by `ADD` and `COPY` instructions. Any changes made in those locations by `RUN` Instructions will be discarded. Previously, this behavior was the default, but it is now disabled by default.
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      .The `--compat-volumes` option is available for Podman and Buildah You can use the new `--compat-volumes` option with the `buildah build`, `podman build`, and `podman farm build` commands. This option triggers special handling for the contents of directories marked using the `VOLUME` instruction such that their contents can subsequently only be modified by `ADD` and `COPY` instructions. Any changes made in those locations by `RUN` Instructions will be discarded. Previously, this behavior was the default, but it is now disabled by default.
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      Description

      SME: rhn-engineering-nalin 

      The --compat-volumes option has been added to the Buildah build command, along with the Podman `build` and `farm build` commands.

      It was created with this PR in Buildah: https://github.com/containers/buildah/pull/5604.

      This change aligns the build process with Docker's BuildKit. There has been confusion when users have tried using an image created in BuildKit on Podman, and there have been incompatibilities.

      The old behavior of handling volumes in the builds can be turned on by setting the `--compat-volumes` option to true in the command line.  The default for the option is false, which emulates BuildKit's functionality.

       

      Man page entry for reference:

      {}--compat-volumes{}

      Handle directories marked using the VOLUME instruction (both in this build, and
      those inherited from base images) such that their contents can only be modified
      by ADD and COPY instructions. Any changes made in those locations by RUN
      instructions will be reverted. Before the introduction of this option, this
      behavior was the default, but it is now disabled by default.

       

            [RHEL-52240] [RHEL EPIC] Create --compat-volumes option to Build and Farm Build - RHEL 10.0 Beta

            Tom Sweeney added a comment -

            ypu@redhat.com or ddarrah@redhat.com Can this be marked as qe_complete or can testing start up for this ASAP please?

            Tom Sweeney added a comment - ypu@redhat.com  or  ddarrah@redhat.com  Can this be marked as qe_complete or can testing start up for this ASAP please?

            Gabriela Necasova added a comment -

            Just FYI: I added a RN doc text - the same as we have for RHEL 9.5 Epic: https://issues.redhat.com/browse/RHEL-52239 

            Gabriela Necasova added a comment - Just FYI: I added a RN doc text - the same as we have for RHEL 9.5 Epic: https://issues.redhat.com/browse/RHEL-52239  

            Nalin Dahyabhai added a comment -

            Adding a pointer to the release-1.37 branch's version of the fix which went in to the main branch.

            Nalin Dahyabhai added a comment - Adding a pointer to the release-1.37 branch's version of the fix which went in to the main branch.

            Nalin Dahyabhai added a comment -

            Confirmed, this is broken if the --layers flag is used, and podman enables it by default while buildah doesn't, so the integration tests that accompanied the original patch didn't catch it. Working on it in https://github.com/containers/buildah/pull/5729 .

            Nalin Dahyabhai added a comment - Confirmed, this is broken if the --layers flag is used, and podman enables it by default while buildah doesn't, so the integration tests that accompanied the original patch didn't catch it. Working on it in https://github.com/containers/buildah/pull/5729 .

              tsweeney@redhat.com Tom Sweeney
              tsweeney@redhat.com Tom Sweeney
              Container Runtime Eng Bot Container Runtime Eng Bot
              Container Runtime Bugs Bot Container Runtime Bugs Bot
              Gabriela Necasova Gabriela Necasova
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