add k8up package (#181)

The k8up CLI (`k8up cli restore`) has no package, so restores need a manual GitHub download on each host.

- add k8up package pinned to 2.16.0, matching the deployed operator
- verify the release tarball against upstream checksums.txt
- ship urfave/cli bash, zsh and fish completions
- build for el9 and fedora 42-44

Requires terraform-artifactapi github allowlist for k8up-io/k8up.

Reviewed-on: #181
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

rpms/k8up/metadata.yaml

@@ -0,0 +1,23 @@
+name: k8up
+github: k8up-io/k8up
+github_release_pattern: ^v2\.
+description: K8up Kubernetes backup operator command line client.
+arch: amd64
+platform: linux
+maintainer: K8up Authors
+homepage: https://github.com/k8up-io/k8up
+license: Apache-2.0
+dist_tag: true
+builds:
+- repository:
+  - almalinux/el9
+  image: git.unkin.net/unkin/almalinux9-rpmbuilder:latest
+  release: 1
+  version: 2.16.0
+- repository:
+  - fedora/42
+  - fedora/43
+  - fedora/44
+  image: git.unkin.net/unkin/almalinux9-rpmbuilder:latest
+  release: 1
+  version: 2.16.0

rpms/k8up/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/k8up-io/k8up/releases/download/v${PACKAGE_VERSION}"
+TARBALL="k8up_${PACKAGE_VERSION}_linux_amd64.tar.gz"
+
+wget -O "/app/${TARBALL}" "${BASE_URL}/${TARBALL}"
+wget -O /app/checksums.txt "${BASE_URL}/checksums.txt"
+
+cd /app
+grep " ${TARBALL}$" checksums.txt | sha256sum --check --strict -
+tar xf "/app/${TARBALL}" -C /app/ k8up
+
+envsubst < /app/resources/nfpm.yaml > /app/nfpm.yaml
+
+nfpm pkg --config /app/nfpm.yaml --target /app/dist --packager rpm

rpms/k8up/resources/completions/_k8up

@@ -0,0 +1,16 @@
+#compdef k8up
+
+local -a opts
+local cur
+cur=${words[-1]}
+if [[ "$cur" == "-"* ]]; then
+  opts=("${(@f)$(${words[@]:0:#words[@]-1} ${cur} --generate-bash-completion 2>/dev/null)}")
+else
+  opts=("${(@f)$(${words[@]:0:#words[@]-1} --generate-bash-completion 2>/dev/null)}")
+fi
+
+if [[ "${opts[1]}" != "" ]]; then
+  _describe 'values' opts
+else
+  _files
+fi

rpms/k8up/resources/completions/k8up

@@ -0,0 +1,34 @@
+
+: ${PROG:=$(basename ${BASH_SOURCE})}
+
+# Macs have bash3 for which the bash-completion package doesn't include
+# _init_completion. This is a minimal version of that function.
+_cli_init_completion() {
+  COMPREPLY=()
+  _get_comp_words_by_ref "$@" cur prev words cword
+}
+
+_cli_bash_autocomplete() {
+  if [[ "${COMP_WORDS[0]}" != "source" ]]; then
+    local cur opts base words
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    if declare -F _init_completion >/dev/null 2>&1; then
+      _init_completion -n "=:" || return
+    else
+      _cli_init_completion -n "=:" || return
+    fi
+    words=("${words[@]:0:$cword}")
+    if [[ "$cur" == "-"* ]]; then
+      requestComp="${words[*]} ${cur} --generate-bash-completion"
+    else
+      requestComp="${words[*]} --generate-bash-completion"
+    fi
+    opts=$(eval "${requestComp}" 2>/dev/null)
+    COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
+    return 0
+  fi
+}
+
+complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete $PROG
+unset PROG

rpms/k8up/resources/completions/k8up.fish

@@ -0,0 +1,11 @@
+function __k8up_complete
+    set -l words (commandline -opc)
+    set -l cur (commandline -ct)
+    if string match -q -- '-*' $cur
+        $words $cur --generate-bash-completion 2>/dev/null
+    else
+        $words --generate-bash-completion 2>/dev/null
+    end
+end
+
+complete -c k8up -f -a '(__k8up_complete)'

rpms/k8up/resources/nfpm.yaml

@@ -0,0 +1,48 @@
+# 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:
+  - k8up
+
+provides:
+  - k8up
+
+contents:
+  - src: /app/k8up
+    dst: /usr/bin/k8up
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
+  - src: /app/resources/completions/k8up
+    dst: /usr/share/bash-completion/completions/k8up
+    file_info:
+      mode: 0644
+      owner: root
+      group: root
+  - src: /app/resources/completions/_k8up
+    dst: /usr/share/zsh/site-functions/_k8up
+    file_info:
+      mode: 0644
+      owner: root
+      group: root
+  - src: /app/resources/completions/k8up.fish
+    dst: /usr/share/fish/vendor_completions.d/k8up.fish
+    file_info:
+      mode: 0644
+      owner: root
+      group: root