pnpm fetch

将 lockfile 中列出包下载到虚拟存储中，包清单被忽略。

使用场景

此命令专门用于加速构建 docker 镜像。

You may have read the official guide to writing a Dockerfile for a Node.js app, if you haven't read it yet, you may want to read it first.

从该指南中，我们学会了如何为使用 pnpm 的项目编写优化的 Dockerfile ，这将类似于

FROM node:14

WORKDIR /path/to/somewhere

RUN curl -f https://get.pnpm.io/v6.16.js | node - add --global pnpm

# Files required by pnpm install
COPY .npmrc package.json pnpm-lock.yaml .pnpmfile.cjs ./

# If you patched any package, include patches before install too
COPY patches patches

RUN pnpm install --frozen-lockfile --prod

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]

As long as there are no changes to .npmrc, package.json, pnpm-lock.yaml, .pnpmfile.cjs, docker build cache is still valid up to the layer of RUN pnpm install --frozen-lockfile --prod, which cost most of the time when building a docker image.

However, modification to package.json may happen much more frequently than we expect, because it does not only contain dependencies, but may also contain the version number, scripts, and arbitrary configuration for any other tool.

维护构建 monorepo 项目的 Dockerfile 也很困难，它可能 看起来像

FROM node:14

WORKDIR /path/to/somewhere

RUN curl -f https://get.pnpm.io/v6.16.js | node - add --global pnpm

# Files required by pnpm install
COPY .npmrc package.json pnpm-lock.yaml .pnpmfile.cjs ./

# If you patched any package, include patches before install too
COPY patches patches

# for each sub-package, we have to add one extra step to copy its manifest
# to the right place, as docker have no way to filter out only package.json with
# single instruction
COPY packages/foo/package.json packages/foo/
COPY packages/bar/package.json packages/bar/

RUN pnpm install --frozen-lockfile --prod

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]

如您所见，当您添加或删除子包时，必须更新 Dockerfile。

pnpm fetch solves the above problem perfectly by providing the ability to load packages into the virtual store using only information from a lockfile.

FROM node:14

WORKDIR /path/to/somewhere

RUN curl -f https://get.pnpm.io/v6.16.js | node - add --global pnpm

# pnpm fetch does require only lockfile
COPY pnpm-lock.yaml ./

# If you patched any package, include patches before running pnpm fetch
COPY patches patches

RUN pnpm fetch --prod


ADD . ./
RUN pnpm install -r --offline --prod


EXPOSE 8080
CMD [ "node", "server.js" ]

It works for both simple and monorepo projects, --offline enforces pnpm not to communicate with the package registry as all needed packages are already present in the virtual store.

As long as the lockfile is not changed, the build cache is valid up to the layer, so RUN pnpm install -r --offline --prod, will save you much time.

配置项

--dev, -D

只会获取开发包

--prod, -P

不会获取开发包