api: add support for multiple uid/gid idmappings #179
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Currently, only single mapping for uid/gid is supported. However, for userns, mutiple uid/gid mappings can be setted. This commit follows how fuse-overlayfs support this feature. containers/fuse-overlayfs@3378869 Signed-off-by: Qi Wang <mpiglet@outlook.com>
When running test_clone_fuse_file as non-root, the test will fail.
```
---- transport::fusedev::linux_session::tests::test_clone_fuse_file stdout ----
thread 'transport::fusedev::linux_session::tests::test_clone_fuse_file' panicked at src/transport/fusedev/linux_session.rs:680:20:
called `Result::unwrap()` on an `Err` value: SessionFailure("Unexpected exit code when running fusermount: Some(1)")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
Signed-off-by: Qi Wang <mpiglet@outlook.com>
yawqi
requested review from
bergwolf,
imeoer,
jiangliu,
liubogithub and
eryugey
as code owners
bergwolf
reviewed
Dec 28, 2023
| fn id_remap(&self, ctx: &mut Context) -> io::Result<()> { | ||
| Ok(()) | ||
| } | ||
| fn id_remap(&self, ctx: &mut Context) {} |
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The API change doesn't seem necessary?
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Currently, only single uid/gid idmapping supported. However, in userns, multiple idmappings can be setted. Besides, in the fuse-overlayfs project, multiple idmappings are supported.
https://github.com/containers/fuse-overlayfs/blob/18f4d6768ab2178f0147c1bac0ccfd7d44841a56/README.md?plain=1#L16
This commit will be used to support kata-containers/kata-containers#8170. Currently, there is no idmap mount support for virtiofs in kernel side. So the support from the virtiofs server side can be used as a temporary workaround.
This comment containerd/containerd#7063 (comment) provides a way to solve the rootfs' idmapping problem. Although it is not used in their implementation at last, but can be used for us to support userns in kata in the first place.