`packer-plugin-ansible` patched to generate newer keys, https://github.com/hashicorp/packer-plugin-ansible/issues/69

PKGBUILD

# Maintainer: Laura Demkowicz-Duffy <[email protected]>
_pkgname=packer-plugin-ansible
pkgname=${_pkgname}-patch
pkgver=1.0.1
pkgrel=1
pkgdesc="Packer ansible plugin with patch applied"
arch=('x86_64')
url="https://github.com/hashicorp/packer-plugin-ansible/issues/69"
license=('MPL2')
depends=(ansible packer)
makedepends=(go)
source=("git+https://github.com/hashicorp/${_pkgname}.git#tag=v${pkgver}"
		"rsa_gone.patch")
noextract=()
md5sums=('SKIP'
         '563c1207ec4a7a893b567cf2ededa41a')
validpgpkeys=()

prepare() {
	cd "$_pkgname"
	patch -p1 -i "$srcdir/rsa_gone.patch"
}

build() {
	cd "$_pkgname"
	GOPATH=$(mktemp -d) go build
}

package() {
	cd "$_pkgname"
	install -Dm 0755 packer-plugin-ansible $pkgdir/usr/bin/packer-plugin-ansible
}

rsa_gone.patch

diff --unified --recursive --text packer-plugin-ansible.orig/provisioner/ansible/provisioner.go packer-plugin-ansible.new/provisioner/ansible/provisioner.go
--- packer-plugin-ansible.orig/provisioner/ansible/provisioner.go	2022-02-25 02:40:53.469060985 +0000
+++ packer-plugin-ansible.new/provisioner/ansible/provisioner.go	2022-02-25 02:46:01.313196247 +0000
@@ -7,8 +7,9 @@
 	"bufio"
 	"bytes"
 	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
 	"crypto/rand"
-	"crypto/rsa"
 	"crypto/x509"
 	"encoding/pem"
 	"errors"
@@ -943,7 +944,7 @@
 		return userKey, nil
 	}

-	key, err := rsa.GenerateKey(rand.Reader, 2048)
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 	if err != nil {
 		return nil, errors.New("Failed to generate key pair")
 	}
@@ -954,9 +955,12 @@

 	// To support Ansible calling back to us we need to write
 	// this file down
-	privateKeyDer := x509.MarshalPKCS1PrivateKey(key)
+	privateKeyDer, err := x509.MarshalPKCS8PrivateKey(key)
+	if err != nil {
+		return nil, errors.New("Failed to marshal private key")
+	}
 	privateKeyBlock := pem.Block{
-		Type:    "RSA PRIVATE KEY",
+		Type:    "PRIVATE KEY",
 		Headers: nil,
 		Bytes:   privateKeyDer,
 	}
@@ -999,7 +1003,7 @@
 		return signer, nil
 	}

-	key, err := rsa.GenerateKey(rand.Reader, 2048)
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 	if err != nil {
 		return nil, errors.New("Failed to generate server key pair")
 	}