rust/src/main.rs: Add bootc entry point

[jmarrero]

closes #4469

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[jmarrero]

This seems to work:

[jmarrero@silverblue debug]$ cat Dockerfile 
FROM quay.io/fedora/fedora-coreos:stable
ADD rpm-ostree /usr/bin/rpm-ostree
RUN ln -s /usr/bin/rpm-ostree /usr/bin/bootc
RUN bootc --help

[jmarrero@silverblue debug]$ podman build .
STEP 1/4: FROM quay.io/fedora/fedora-coreos:stable
STEP 2/4: ADD rpm-ostree /usr/bin/rpm-ostree
--> Using cache 5496e78b39f5e067233edeafb7e311604d7b2a985b61f644bc6f1c391af2b096
--> 5496e78b39f5
STEP 3/4: RUN ln -s /usr/bin/rpm-ostree /usr/bin/bootc
--> Using cache b6c95d0b62e0fb4caba319b71a8a741a1041a532f7b630e79161c03aafaa3fd3
--> b6c95d0b62e0
STEP 4/4: RUN bootc --help
[rust/src/main.rs:99] "CALLNAME:  {:?}" = "CALLNAME:  {:?}"
[rust/src/main.rs:99] &callname = "bootc"
Deploy and upgrade via bootable container images

Usage: bootc <COMMAND>

Commands:
  upgrade                Look for updates to the booted container image
  switch                 Target a new container image reference to boot
  edit                   Change host specification
  status                 Display status
  usr-overlay            Add a transient writable overlayfs on `/usr` that will be discarded on reboot
  install                Install to the target block device
  install-to-filesystem  Install to the target filesystem
  help                   Print this message or the help of the given subcommand(s)

Options:
  -h, --help  Print help
COMMIT

[jmarrero]

Need to figure out why this is failing in CI and not locally.

[2023-07-20T02:09:20.702Z] error: could not compile `k8s-openapi` (lib)

[2023-07-20T02:09:20.702Z] 

[2023-07-20T02:09:20.702Z] Caused by:

[2023-07-20T02:09:20.703Z]   process didn't exit successfully: `rustc --crate-name k8s_openapi --edition=2021 /home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/vendor/k8s-openapi/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C panic=abort -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="api"' --cfg 'feature="default"' --cfg 'feature="http"' --cfg 'feature="percent-encoding"' --cfg 'feature="url"' --cfg 'feature="v1_25"' -C metadata=df2f859b7d5968ca -C extra-filename=-df2f859b7d5968ca --out-dir /home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps -L dependency=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps --extern base64=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libbase64-83b2a0613e736ac7.rmeta --extern bytes=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libbytes-b4ce8976458143d9.rmeta --extern chrono=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libchrono-7cd2d65cb1a546a9.rmeta --extern http=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libhttp-aea824e4d5883e1c.rmeta --extern percent_encoding=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libpercent_encoding-aef2ed335e558e08.rmeta --extern serde=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libserde-9d08324affe04c50.rmeta --extern serde_value=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libserde_value-629348bdbe71a350.rmeta --extern serde_json=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/libserde_json-c807c23fc8bf2876.rmeta --extern url=/home/jenkins/agent/workspace/rpm-ostree_PR-4506/rpm-ostree-2023.5.19.geffeac4d/target/release/deps/liburl-d85b157bbcc6509e.rmeta --cap-lints allow -Copt-level=3 -Cdebuginfo=2 -Ccodegen-units=1 -Cforce-frame-pointers=yes -Clink-arg=-Wl,-z,relro -Clink-arg=-Wl,-z,now -Clink-arg=-specs=/usr/lib/rpm/redhat/redhat-package-notes --cap-lints=warn --cfg 'k8s_openapi_enabled_version="1.25"'` (signal: 9, SIGKILL: kill)

[2023-07-20T02:09:20.703Z] warning: build failed, waiting for other jobs to finish...

[cgwalters]

/test all

[cgwalters]

To dig into the Jenkins pods https://console-openshift-console.apps.ocp.fedoraproject.org/k8s/ns/coreos-ci/core~v1~Pod

[cgwalters]

Looks sane to me!

[cgwalters]

One thing we could consider doing here (as a followup, no reason not to merge this as is):

• Introduce /usr/libexec/rpm-ostree-bootc as a distinct binary. We'd need to rework the buildsystem for this. But a key advantage of this that that binary would not link to librpm (for example).
• Then we can introduce an rpm-ostree-bootc subpackage of the main rpm-ostree.spec
• Then we can add just that tool into a container image, without dragging in the full rpm-ostree stack.

[cgwalters]

(I think this will conflict textually (but not semantically) with #4510 - but can we get that one in first?)

[jmarrero]

(I think this will conflict textually (but not semantically) with #4510 - but can we get that one in first?)

of course

[jmarrero]

Will open a follow up with docs too, after that: #4506 (comment)

[cgwalters]

@jmarrero this also broke the build on ppc64le/s390x https://download.copr.fedorainfracloud.org/results/@CoreOS/continuous/centos-stream-9-s390x/06225783-rpm-ostree/build.log.gz - it's actually a bootc bug though

[jmarrero]

@jmarrero this also broke the build on ppc64le/s390x https://download.copr.fedorainfracloud.org/results/@CoreOS/continuous/centos-stream-9-s390x/06225783-rpm-ostree/build.log.gz - it's actually a bootc bug though

We are vendoring from main, so if we fix:
containers/bootc#112 (the issue I oppened for this) then we should not need to back this out.) Ill look into this Monday, we are getting close to needing a release so if the fix is not obvious to me I will back this out for until I figure it out.