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Use Proxmox for a template before reaching for linuxcontainers.org #23

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400905e
Ask Proxmox for a template before reaching for linuxcontainers.org
MickLesk Sep 4, 2026
5df7aa7
incus: check the local image cache before asking the remote
MickLesk Sep 4, 2026
314726b
incus: trim comment
MickLesk Sep 4, 2026
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24 changes: 13 additions & 11 deletions incus/backend.func
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Original file line number Diff line number Diff line change
Expand Up @@ -90,24 +90,26 @@ _incus_resolve_launch_image() {
candidates+=("images:ubuntu/${ver}.04" "images:ubuntu/${ver}.04/cloud")
fi

local cand local_match
local cand local_aliases

# Local first: no round-trip, and works without internet.
local_aliases=$(incus image list -f csv,noheader -c l 2>/dev/null || true)
for cand in "${candidates[@]}"; do
if [[ -n "$local_aliases" ]] &&
grep -qxF "${cand#images:}" <<<"$local_aliases" &&
incus image info "${cand#images:}" &>/dev/null; then
INCUS_LAUNCH_IMAGE="${cand#images:}"
return 0
fi
done

for cand in "${candidates[@]}"; do
if incus image info "$cand" &>/dev/null; then
INCUS_LAUNCH_IMAGE="$cand"
return 0
fi
done

# Local image fingerprint/alias match (already copied)
local_match=$(incus image list -f csv,noheader 2>/dev/null |
awk -F, -v os="$os" -v ver="$ver" '
tolower($0) ~ os && $0 ~ ver { print $1; exit }
' || true)
if [[ -n "$local_match" ]] && incus image info "$local_match" &>/dev/null; then
INCUS_LAUNCH_IMAGE="$local_match"
return 0
fi

# Last resort: try remote launch of primary (incus may pull on demand)
INCUS_LAUNCH_IMAGE="images:${os}/${ver}"
return 1
Expand Down
53 changes: 31 additions & 22 deletions pve/backend.func
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Expand Up @@ -2367,8 +2367,31 @@ create_lxc_container() {
}

# Downloads an ARM64 LXC rootfs template to $1.
# Debian: fetches latest release from community-scripts/debian-arm64-lxc on GitHub.
# Others: fetches from jenkins.linuxcontainers.org.
# Does Proxmox offer this OS/version/arch? Local first, then the catalog.
_pveam_offers_template() {
local search pattern
search="${PCT_OSTYPE}-${PCT_OSVERSION:-}"
case "$PCT_OSTYPE" in
debian | ubuntu) pattern="-standard_" ;;
alpine | fedora | rocky | centos) pattern="-default_" ;;
*) pattern="" ;;
esac

if pveam list "$TEMPLATE_STORAGE" 2>/dev/null |
awk -v s="$search" -v p="$pattern" -v a="$ARCH" \
'$1 ~ s && $1 ~ p && $1 ~ ("_" a "\\.(tar\\.zst|tar\\.xz|tar\\.gz)$") {found=1}
END {exit !found}'; then
return 0
fi

_pveam_update >/dev/null 2>&1 || true
_pveam_available |
grep -E "_${ARCH}\.(tar\.zst|tar\.xz|tar\.gz)([[:space:]]|$)" |
awk '{print $2}' |
grep -qE "^${search}.*${pattern}"
}

# Only reached when pveam has nothing for this arch.
download_arm64_template() {
local dest="$1" url

Expand All @@ -2377,21 +2400,7 @@ create_lxc_container() {
exit 217
}

if [[ "$PCT_OSTYPE" == "debian" ]]; then
url=$(
curl -fsSL "https://api.github.com/repos/community-scripts/debian-arm64-lxc/releases/latest" |
jq -r --arg v "$CUSTOM_TEMPLATE_VARIANT" \
'.assets[].browser_download_url | select(test("debian-" + $v + "-arm64-rootfs\\.tar\\.xz$"))' |
head -n1
)

[[ -n "$url" ]] || {
msg_error "Could not find Debian ${CUSTOM_TEMPLATE_VARIANT} ARM64 template URL."
exit 225
}
else
url="https://jenkins.linuxcontainers.org/job/image-${PCT_OSTYPE}/architecture=arm64,release=${CUSTOM_TEMPLATE_VARIANT},variant=default/lastStableBuild/artifact/rootfs.tar.xz"
fi
url="https://jenkins.linuxcontainers.org/job/image-${PCT_OSTYPE}/architecture=arm64,release=${CUSTOM_TEMPLATE_VARIANT},variant=default/lastStableBuild/artifact/rootfs.tar.xz"

msg_info "Downloading ${PCT_OSTYPE^} ${CUSTOM_TEMPLATE_VARIANT} ARM64 template"
local patched="${dest%/*}/.${dest##*/}.patched"
Expand Down Expand Up @@ -2603,9 +2612,8 @@ create_lxc_container() {
# ------------------------------------------------------------------------------
CUSTOM_TEMPLATE_VARIANT=""

if [[ "$ARCH" == "arm64" ]]; then
# ARM64: use custom template download from linuxcontainers.org / GitHub
msg_info "Preparing ARM64 template"
if [[ "$ARCH" == "arm64" ]] && ! _pveam_offers_template; then
msg_info "No Proxmox template for ${PCT_OSTYPE} on ${ARCH}, using linuxcontainers.org"

CUSTOM_TEMPLATE_VARIANT=$(arm64_template_variant "$PCT_OSTYPE" "${PCT_OSVERSION:-}") || {
msg_error "No ARM64 template mapping for ${PCT_OSTYPE} ${PCT_OSVERSION:-latest}"
Expand Down Expand Up @@ -2730,12 +2738,13 @@ create_lxc_container() {

mapfile -t LOCAL_TEMPLATES < <(
pveam list "$TEMPLATE_STORAGE" 2>/dev/null |
awk -v search="${TEMPLATE_SEARCH}-" -v pattern="${TEMPLATE_PATTERN}" '$1 ~ search && $1 ~ pattern {print $1}' |
awk -v search="${TEMPLATE_SEARCH}-" -v pattern="${TEMPLATE_PATTERN}" -v arch="${ARCH}" \
'$1 ~ search && $1 ~ pattern && $1 ~ ("_" arch "\\.(tar\\.zst|tar\\.xz|tar\\.gz)$") {print $1}' |
sed 's|.*/||' | sort -t - -k 2 -V || true
)
mapfile -t ONLINE_TEMPLATES < <(
_pveam_available |
grep -E '\.(tar\.zst|tar\.xz|tar\.gz)$' |
grep -E "_${ARCH}\.(tar\.zst|tar\.xz|tar\.gz)([[:space:]]|$)" |
awk '{print $2}' |
grep -E "^${TEMPLATE_SEARCH}-.*${TEMPLATE_PATTERN}" |
sort -t - -k 2 -V 2>/dev/null || true
Expand Down
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