```
export MINIO_IDENTITY_OPENID_CLAIM_NAME=groups
```

and add relevant policies on MinIO using `mc admin policy create myminio/ <group_name> group-access.json`

## Explore Further

- [MinIO STS Quickstart Guide](https://docs.min.io/community/minio-object-store/developers/security-token-service.html)

func (h *headerGNU) magic() []byte       { return h[257:][:6] }
func (h *headerGNU) version() []byte     { return h[263:][:2] }
func (h *headerGNU) userName() []byte    { return h[265:][:32] }
func (h *headerGNU) groupName() []byte   { return h[297:][:32] }
func (h *headerGNU) devMajor() []byte    { return h[329:][:8] }
func (h *headerGNU) devMinor() []byte    { return h[337:][:8] }
func (h *headerGNU) accessTime() []byte  { return h[345:][:12] }

	groupPolicyMappingLoadStartTime := UTCNow()
	groupPolicyMappingsList := listedConfigItems[policyDBGroupsListKey]
	for _, item := range groupPolicyMappingsList {
		groupName := strings.TrimSuffix(item, ".json")
		if err := iamOS.loadMappedPolicy(ctx, groupName, regUser, true, cache.iamGroupPolicyMap); err != nil && !errors.Is(err, errNoSuchPolicy) {
			return fmt.Errorf("unable to load the policy mapping for the group: %w", err)
		}
	}

	// Unpack format specific fields.
	if format > formatV7 {
		ustar := tr.blk.toUSTAR()
		hdr.Uname = p.parseString(ustar.userName())
		hdr.Gname = p.parseString(ustar.groupName())
		hdr.Devmajor = p.parseNumeric(ustar.devMajor())
		hdr.Devminor = p.parseNumeric(ustar.devMinor())

		var prefix string
		switch {
		case format.has(FormatUSTAR | FormatPAX):
			hdr.Format = format

	verifyString(h.Name, len(v7.name()), "Name", paxPath)
	verifyString(h.Linkname, len(v7.linkName()), "Linkname", paxLinkpath)
	verifyString(h.Uname, len(ustar.userName()), "Uname", paxUname)
	verifyString(h.Gname, len(ustar.groupName()), "Gname", paxGname)
	verifyNumeric(h.Mode, len(v7.mode()), "Mode", paxNone)
	verifyNumeric(int64(h.Uid), len(v7.uid()), "Uid", paxUid)
	verifyNumeric(int64(h.Gid), len(v7.gid()), "Gid", paxGid)

	fmtNum(v7.gid(), int64(hdr.Gid))
	fmtNum(v7.size(), hdr.Size)
	fmtNum(v7.modTime(), modTime.Unix())

	ustar := tw.blk.toUSTAR()
	fmtStr(ustar.userName(), hdr.Uname)
	fmtStr(ustar.groupName(), hdr.Gname)
	fmtNum(ustar.devMajor(), hdr.Devmajor)
	fmtNum(ustar.devMinor(), hdr.Devminor)

	return &tw.blk
}

// writeRawFile writes a minimal file with the given name and flag type.