Auto-updater ate 266 GB by reinstalling OpenCode every 10 minutes

Description

A long-running opencode2 serve --service process filled ~/.npm/_cacache with 266 GB of OpenCode beta packages.

After npm updates the executable, the running server keeps its original compiled version in memory. Its ten-minute update loop still thinks it is outdated, so it installs the same latest version again.

My logs repeat this indefinitely:

update check current=0.0.0-next-16473 latest=0.0.0-beta-17498
updated OpenCode from=0.0.0-next-16473 to=0.0.0-beta-17498 method=npm

# ten minutes later

update check current=0.0.0-next-16473 latest=0.0.0-beta-17498
updated OpenCode from=0.0.0-next-16473 to=0.0.0-beta-17498 method=npm

The service ran unattended for roughly three weeks:

265.97GiB  ~/.npm/_cacache

The current beta source still schedules checks every ten minutes and compares against the immutable OPENCODE_VERSION.

Related to #38567 and #41495, but this happens after successful updates and continues until the disk fills.

Plugins

None required.

OpenCode version

0.0.0-next-16473, repeatedly updating through the beta channel.

Steps to reproduce

Use a disposable environment because this can consume substantial disk space.

root=/var/tmp/opencode-updater-repro
mkdir -p "$root/home" "$root/npm-prefix" "$root/npm-cache"

export HOME="$root/home"
export NPM_CONFIG_PREFIX="$root/npm-prefix"
export NPM_CONFIG_CACHE="$root/npm-cache"
export PATH="$NPM_CONFIG_PREFIX/bin:$PATH"

npm install -g @opencode-ai/cli@0.0.0-beta-18219
opencode2 serve --service

Then:

1. Let the first automatic update complete.
2. Confirm the globally installed package is now newer.
3. Leave the original server running for another ten minutes.
4. Check the OpenCode and npm logs.
5. The server installs the same latest package again because its reported current version never changes.
6. Each cycle adds more packages to the npm cache.

grep -E "update check|updated OpenCode" \
  "$HOME/.local/share/opencode/log/opencode.log"

du -sh "$NPM_CONFIG_CACHE"

Screenshot and/or share link

N/A

Operating System

Fedora Linux 44, kernel 7.1.5-200.fc44.x86_64

Terminal

Ghostty