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setup.sh: persistent Go cache + HOME so timer deploys build instead of OOM/erroring

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The self-update timer runs setup.sh as a systemd oneshot with no $HOME, so
`go build` aborted with "module cache not found: neither GOMODCACHE nor GOPATH
is set" before compiling — auto-deploys silently pulled new code but never
rebuilt or restarted. On top of that, a cold cache made the 458MB droplet
OOM-kill the compiler.

Set explicit, root-owned, persistent Go caches (/var/cache/agentbbs/{go,go-build})
plus HOME and GOMAXPROCS=1 in setup.sh, and add HOME=/root to the generated
agentbbs-update.service. A warm persistent cache means incremental redeploys
recompile almost nothing, keeping peak memory within RAM+swap; combined with
the existing `go build -p=1` the compiler no longer gets OOM-killed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Anthony Ettinger 2026-06-14 10:31:29 +00:00
parent cbc9069964
commit 31c00cd65a
1 changed files with 18 additions and 0 deletions
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18
setup.sh
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@ -111,6 +111,21 @@ if [ "$("$GO_ROOT/bin/go" version 2>/dev/null | awk '{print $3}')" != "go${GO_VE
fi
export PATH="$GO_ROOT/bin:$PATH"
# Persistent, root-owned Go caches. Two reasons this matters on this box:
# 1. The self-update timer runs setup.sh as a systemd oneshot with no $HOME, so
# a bare `go build` aborts with "module cache not found: neither GOMODCACHE
# nor GOPATH is set" before it compiles a thing. Setting these explicitly
# (not relying on $HOME) fixes timer-driven redeploys.
# 2. A warm cache means an incremental redeploy recompiles only what changed, so
# the 458MB droplet stops OOM-killing the compiler on every build. Combined
# with GOMAXPROCS=1 + `go build -p=1`, peak memory stays within RAM+swap.
export HOME="${HOME:-/root}"
export GOPATH="${GOPATH:-/var/cache/agentbbs/go}"
export GOMODCACHE="${GOMODCACHE:-$GOPATH/pkg/mod}"
export GOCACHE="${GOCACHE:-/var/cache/agentbbs/go-build}"
export GOMAXPROCS=1
mkdir -p "$GOPATH" "$GOCACHE"
# ---- 3. service user + rootless podman prerequisites -----------------------
if ! id "$SVC_USER" >/dev/null 2>&1; then
log "creating service user $SVC_USER"
@ -304,6 +319,9 @@ Wants=network-online.target
[Service]
Type=oneshot
# systemd oneshots start with no HOME; set one so git (and Go, via setup.sh)
# behave the same as an interactive root deploy instead of erroring.
Environment=HOME=/root
Environment=REPO=${REPO}
Environment=BRANCH=${BRANCH}
Environment=SRC_DIR=${SRC_DIR}