add kubectl-tree package (#180)

kubectl-tree is not packaged, and its own completion only covers flags while its `completion` scripts register for `kubectl` itself.

- add kubectl-tree 0.6.0 for el9 and fedora 42-44, checksum-verified via artifactapi
- add `kubectl_complete-tree` delegating flags to kubectl-tree and KIND/NAME to `kubectl get` completion

Requires terraform-artifactapi github allowlist entries for ahmetb/kubectl-tree.

Reviewed-on: #180
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

rpms/kubectl-tree/metadata.yaml

@@ -0,0 +1,22 @@
+name: kubectl-tree
+github: ahmetb/kubectl-tree
+description: kubectl plugin to browse Kubernetes object hierarchies as a tree.
+arch: amd64
+platform: linux
+maintainer: Ahmet Alp Balkan
+homepage: https://github.com/ahmetb/kubectl-tree
+license: Apache-2.0
+dist_tag: true
+builds:
+- repository:
+  - almalinux/el9
+  image: git.unkin.net/unkin/almalinux9-rpmbuilder:latest
+  release: 1
+  version: 0.6.0
+- repository:
+  - fedora/42
+  - fedora/43
+  - fedora/44
+  image: git.unkin.net/unkin/almalinux9-rpmbuilder:latest
+  release: 1
+  version: 0.6.0

rpms/kubectl-tree/resources/build.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/bash
+
+set -e
+
+BASE_URL="https://artifactapi.k8s.syd1.au.unkin.net/api/v1/remote/github/ahmetb/kubectl-tree/releases/download/v${PACKAGE_VERSION}"
+TARBALL="kubectl-tree_v${PACKAGE_VERSION}_linux_amd64.tar.gz"
+
+wget -O "/app/${TARBALL}" "${BASE_URL}/${TARBALL}"
+wget -O /app/checksums.txt "${BASE_URL}/kubectl-tree_${PACKAGE_VERSION}_checksums.txt"
+
+cd /app
+grep " ${TARBALL}$" checksums.txt | sha256sum --check --strict -
+tar xf "/app/${TARBALL}" -C /app/ kubectl-tree
+
+envsubst < /app/resources/nfpm.yaml > /app/nfpm.yaml
+
+nfpm pkg --config /app/nfpm.yaml --target /app/dist --packager rpm

rpms/kubectl-tree/resources/kubectl_complete-tree

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+# kubectl-tree only completes flags; its KIND NAME args match kubectl get
+for arg in "$@"; do last=$arg; done
+case "$last" in
+  -*) exec kubectl tree __complete "$@" ;;
+  *) exec kubectl __complete get "$@" ;;
+esac

rpms/kubectl-tree/resources/nfpm.yaml

@@ -0,0 +1,36 @@
+# nfpm.yaml
+
+name: ${PACKAGE_NAME}
+version: ${PACKAGE_VERSION}
+release: ${PACKAGE_RELEASE}
+arch: ${PACKAGE_ARCH}
+platform: ${PACKAGE_PLATFORM}
+section: default
+priority: extra
+description: "${PACKAGE_DESCRIPTION}"
+
+maintainer: ${PACKAGE_MAINTAINER}
+homepage: ${PACKAGE_HOMEPAGE}
+license: ${PACKAGE_LICENSE}
+
+disable_globbing: false
+
+replaces:
+  - kubectl-tree
+
+provides:
+  - kubectl-tree
+
+contents:
+  - src: /app/kubectl-tree
+    dst: /usr/bin/kubectl-tree
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
+  - src: /app/resources/kubectl_complete-tree
+    dst: /usr/bin/kubectl_complete-tree
+    file_info:
+      mode: 0755
+      owner: root
+      group: root