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Feature `mounts` schema rejects the `--mount` options the spec promises (e.g. `volume-subpath`)

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难度
4/5
预计耗时
3-5 天
新手友好度
53/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
docker, docker-compose, json

调研方向

Start with the Mount definition around line 314 of schemas/devContainerFeature.schema.json and compare it with the feature spec’s description of Docker --mount options. Then trace where feature mounts are converted for docker run and Compose; the issue points to devcontainers/cli#881 and #1314 for related readonly behavior. Done means the schema accepts the requested options and implementations pass them through to both Docker and Compose.

由索引模型根据 Issue 内容生成。

描述

The features spec says each mounts entry "accepts the same values as the Docker CLI --mount flag" (devcontainer-features.md), but the schema only allows three keys. Mount in schemas/devContainerFeature.schema.json (line 314) is an object with source, target and type, and "additionalProperties": false. So options like readonly or volume-subpath can't be declared by a feature.

Use case: several features sharing one named volume, each mounting only its own subfolder, which Docker supports since Engine 26.0 and Compose since 2.26.0:

"mounts": [{ "source": "programs", "target": "/opt/texlive", "type": "volume", "volume-subpath": "texlive" }]

Proposal: allow the --mount options in the Mount schema (at least readonly and volume-subpath), and have implementations pass them through to docker run --mount and to Compose's long volume syntax.

Related: #754 (string vs. object mounts), devcontainers/cli#881 and devcontainers/cli#1314 (the CLI drops readonly).

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环境准备

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