Support feature subcommand #2837

musaprg · 2024-06-29T15:46:14Z

derived from #2395, and fixes #815

This PR introduces a new youki features subcommand, which returns the Features Structure¹ defined in the OCI runtime spec. Features Structure is written in JSON format and contains runtime features supported by the youki.

TODO

Add seccomp support information based on the feature flags
- Waiting for the response of Add seccomp into feature flags of youki to be compiled in #2924

https://github.com/opencontainers/runtime-spec/blob/main/features.md ↩

crates/youki/Cargo.toml

YJDoc2 · 2024-09-20T04:57:36Z

Hey @musaprg , just wanted to confirm if you are following up on this, or might be busy with something else. No worries if you can't continue, but let us know. Thanks!

musaprg · 2024-09-21T09:02:30Z

@YJDoc2 Hi. sorry I have been a bit busy these days, but I'm still working on it. I'll update the dependency and add missing implementations.

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@@            Coverage Diff             @@
##             main    #2837      +/-   ##
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+ Coverage   66.76%   67.04%   +0.28%     
==========================================
  Files         131      131              
  Lines       16673    16831     +158     
==========================================
+ Hits        11131    11285     +154     
- Misses       5542     5546       +4

crates/youki/Cargo.toml

Signed-off-by: Darrell Tang <[email protected]> change struct name to resolve conflict Signed-off-by: Darrell Tang <[email protected]> fix annotation references Signed-off-by: Darrell Tang <[email protected]> set as Strings Signed-off-by: Darrell Tang <[email protected]> use serde Signed-off-by: Darrell Tang <[email protected]> pretty print Signed-off-by: Darrell Tang <[email protected]> clean up names to match runc features output Signed-off-by: Darrell Tang <[email protected]> rearrange structs and constants Signed-off-by: Darrell Tang <[email protected]> fix lint issues Signed-off-by: Darrell Tang <[email protected]> try to source caps dynamically Signed-off-by: Darrell Tang <[email protected]> try to source namespaces dynamically Signed-off-by: Darrell Tang <[email protected]> fix query_caps Signed-off-by: Darrell Tang <[email protected]> fix match statements Signed-off-by: Darrell Tang <[email protected]> fix linting issues Signed-off-by: Darrell Tang <[email protected]> fix extra line for linting Signed-off-by: Darrell Tang <[email protected]> Fix format Signed-off-by: Kotaro Inoue <[email protected]>

Signed-off-by: Kotaro Inoue <[email protected]>

musaprg · 2024-09-28T15:19:34Z

@YJDoc2 @utam0k Hi, this PR is ready for review now. Could you check it at your convenience?
I don't think supporting seccomp support information in this PR would be necessary. I can implement it in another PR once #2924 gets merged. Thanks!

YJDoc2

Couple of comments.

crates/youki/src/commands/features.rs

Signed-off-by: Kotaro Inoue <[email protected]>

crates/youki/src/commands/features.rs

Signed-off-by: Kotaro Inoue <[email protected]>

YJDoc2 · 2024-09-30T04:43:38Z

Hey @musaprg , I ran this on my system and compared with runc's output, and there are some differences -

youki's output

`./youki features`

{ "ociVersionMin": "1.0.0", "ociVersionMax": "1.0.2", "hooks": [ "prestart", "createRuntime", "createContainer", "startContainer", "poststart", "poststop" ], "mountOptions": [ "async", "atime", "bind", "defaults", "dev", "diratime", "dirsync", "exec", "mand", "noatime", "nodev", "nodiratime", "noexec", "nomand", "norelatime", "nosuid", "nostrictatime", "private", "rbind", "rdev", "relatime", "remount", "rnoatime", "rnodev", "rnodiratime", "rnoexec", "rnorelatime", "rnosuid", "rnostrictatime", "ro", "rprivate", "rrw", "rshared", "rsuid", "rsymfollow", "rslave", "rstrictatime", "runbindable", "rw", "shared", "slave", "strictatime", "suid", "sync", "unbindable" ], "linux": { "namespaces": [ "pid", "network", "uts", "ipc", "mount", "user", "cgroup", "time" ], "capabilities": [], "cgroup": { "v1": false, "v2": false, "systemd": false, "systemdUser": false, "rdma": false }, "seccomp": null, "apparmor": { "enabled": true }, "selinux": { "enabled": false }, "intelRdt": { "enabled": true }, "mountExtensions": { "idmap": { "enabled": false } } }, "annotations": null, "potentiallyUnsafeConfigAnnotations": null }

runc's output

`runc features`

{ "ociVersionMin": "1.0.0", "ociVersionMax": "1.0.2-dev", "hooks": [ "prestart", "createRuntime", "createContainer", "startContainer", "poststart", "poststop" ], "mountOptions": [ "acl", "async", "atime", "bind", "defaults", "dev", "diratime", "dirsync", "exec", "iversion", "lazytime", "loud", "mand", "noacl", "noatime", "nodev", "nodiratime", "noexec", "noiversion", "nolazytime", "nomand", "norelatime", "nostrictatime", "nosuid", "nosymfollow", "private", "ratime", "rbind", "rdev", "rdiratime", "relatime", "remount", "rexec", "rnoatime", "rnodev", "rnodiratime", "rnoexec", "rnorelatime", "rnostrictatime", "rnosuid", "rnosymfollow", "ro", "rprivate", "rrelatime", "rro", "rrw", "rshared", "rslave", "rstrictatime", "rsuid", "rsymfollow", "runbindable", "rw", "shared", "silent", "slave", "strictatime", "suid", "symfollow", "sync", "tmpcopyup", "unbindable" ], "linux": { "namespaces": [ "cgroup", "ipc", "mount", "network", "pid", "user", "uts" ], "capabilities": [ "CAP_CHOWN", "CAP_DAC_OVERRIDE", "CAP_DAC_READ_SEARCH", "CAP_FOWNER", "CAP_FSETID", "CAP_KILL", "CAP_SETGID", "CAP_SETUID", "CAP_SETPCAP", "CAP_LINUX_IMMUTABLE", "CAP_NET_BIND_SERVICE", "CAP_NET_BROADCAST", "CAP_NET_ADMIN", "CAP_NET_RAW", "CAP_IPC_LOCK", "CAP_IPC_OWNER", "CAP_SYS_MODULE", "CAP_SYS_RAWIO", "CAP_SYS_CHROOT", "CAP_SYS_PTRACE", "CAP_SYS_PACCT", "CAP_SYS_ADMIN", "CAP_SYS_BOOT", "CAP_SYS_NICE", "CAP_SYS_RESOURCE", "CAP_SYS_TIME", "CAP_SYS_TTY_CONFIG", "CAP_MKNOD", "CAP_LEASE", "CAP_AUDIT_WRITE", "CAP_AUDIT_CONTROL", "CAP_SETFCAP", "CAP_MAC_OVERRIDE", "CAP_MAC_ADMIN", "CAP_SYSLOG", "CAP_WAKE_ALARM", "CAP_BLOCK_SUSPEND", "CAP_AUDIT_READ", "CAP_PERFMON", "CAP_BPF", "CAP_CHECKPOINT_RESTORE" ], "cgroup": { "v1": true, "v2": true, "systemd": true, "systemdUser": true }, "seccomp": { "enabled": true, "actions": [ "SCMP_ACT_ALLOW", "SCMP_ACT_ERRNO", "SCMP_ACT_KILL", "SCMP_ACT_KILL_PROCESS", "SCMP_ACT_KILL_THREAD", "SCMP_ACT_LOG", "SCMP_ACT_NOTIFY", "SCMP_ACT_TRACE", "SCMP_ACT_TRAP" ], "operators": [ "SCMP_CMP_EQ", "SCMP_CMP_GE", "SCMP_CMP_GT", "SCMP_CMP_LE", "SCMP_CMP_LT", "SCMP_CMP_MASKED_EQ", "SCMP_CMP_NE" ], "archs": [ "SCMP_ARCH_AARCH64", "SCMP_ARCH_ARM", "SCMP_ARCH_MIPS", "SCMP_ARCH_MIPS64", "SCMP_ARCH_MIPS64N32", "SCMP_ARCH_MIPSEL", "SCMP_ARCH_MIPSEL64", "SCMP_ARCH_MIPSEL64N32", "SCMP_ARCH_PPC", "SCMP_ARCH_PPC64", "SCMP_ARCH_PPC64LE", "SCMP_ARCH_RISCV64", "SCMP_ARCH_S390", "SCMP_ARCH_S390X", "SCMP_ARCH_X32", "SCMP_ARCH_X86", "SCMP_ARCH_X86_64" ] }, "apparmor": { "enabled": true }, "selinux": { "enabled": true } }, "annotations": { "io.github.seccomp.libseccomp.version": "2.5.3", "org.opencontainers.runc.checkpoint.enabled": "true", "org.opencontainers.runc.commit": "v1.1.13-0-g58aa920", "org.opencontainers.runc.version": "1.1.13" } }

The major differences I see here are capabilities list, cgroup and systemd info, also seccomp info. Can you take a look?

musaprg · 2024-10-03T15:56:35Z

@YJDoc2 IIUC, as for the systemd-related fields, it depends on the youki's feature flags indicating which feature should be compiled in. I guess executing cargo build without any feature flags won't include any cgroup features such as v1, v2, systemd, systemd-user. Could you try scripts/build.sh -o $PWD -c youki -f v2 for example?

musaprg · 2024-10-03T15:57:58Z

As for the seccomp information, #2924 is required to be merged, so I've just left it as null, which means unknown about seccomp support.

musaprg · 2024-10-03T16:01:03Z

As for capabilities, I probably misunderstood the spec. The capabilities listed there don't have to be actually supported on the kernel running youki. I've fixed it in b8f902a.

The recognized names of the capabilities, including capabilities that might not be supported by the host operating system. The runtime MUST recognize the elements in this array in the process.capabilities object of config.json.
https://github.com/opencontainers/runtime-spec/blob/main/features-linux.md#capabilities

Signed-off-by: Kotaro Inoue <[email protected]>

musaprg · 2024-10-03T16:10:10Z

I noticed that namespaces also should include all possible namespaces regardless of whether it's supported on the kernel. I've fixed it in a73d957.

The recognized names of the namespaces, including namespaces that might not be supported by the host operating system. The runtime MUST recognize the elements in this array as the type of linux.namespaces objects in config.json.

Signed-off-by: Kotaro Inoue <[email protected]>

utam0k · 2024-10-09T02:46:52Z

crates/youki/src/commands/features.rs

+}
+
+// Return a list of known mount options supported by youki
+fn known_mount_options() -> Vec<String> {


This may be slightly beyond the scope of this PR, but I'm considering methods to ensure this list is regularly updated. WDYT?

OK, I'll try.

Hey, unless either of you have done implementation of the updation, I think we should go ahead with hard-coded parts in this PR and merge once reviewed, and the dynamic values can be done in #2937 or so. WDYT?

Sorry, I have been a bit busy recently. Separating PR sounds good to me, but either would be fine. I'll continue working on #2937 in that case.

utam0k added the kind/feature label Jul 1, 2024

musaprg force-pushed the issue-815-support-feature-subcommand branch 2 times, most recently from 64ebe28 to 804e48b Compare July 7, 2024 03:23

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Add features structure type youki-dev/oci-spec-rs#184

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utam0k mentioned this pull request Jul 11, 2024

Support feature subcommand #2395

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Derive strum's EnumIter trait for enums youki-dev/oci-spec-rs#197

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Release v0.7.0 youki-dev/oci-spec-rs#210

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Bump oci-spec from 0.6.8 to 0.7.0 #2920

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Support feature subcommand

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Signed-off-by: Kotaro Inoue <[email protected]>

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fixup! Support feature subcommand

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fixup! Support feature subcommand

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fixup! Support feature subcommand

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fixup! Support feature subcommand

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fixup! Support feature subcommand

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