canonical/multipass

Allow specifying wildcards (`*`) for `--[ug]id-map` on mounts

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#1,200 opened on Nov 30, 2019

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enhancementgood first issuehelp wantedmediumneeds triage

Description

What are the host-side ids to use when running multipass mount? I am accessing files through a user other than "multipass".

Without specifying -u and -g, I see from "multipass info", the following map: "UID map: -2:default". From the code, it looks like both the host and instance ids should be unsigned integers.

Contributor guide

Tech stack
cpp
Domain
cli
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the current implementation of ` uid map` and ` gid map` in the mount command, likely in the source files related to mount handling (e.g., `src/client/cli/cmd/mount.cpp`). Check the existing UID/GID mapping logic and how wildcards could be parsed and applied. Review the 10 comments on this issue for any proposed solutions or further clarification on expected behavior. Ensure that adding wildcard support does not break existing integer based mappings.