51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
// +build freebsd linux
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package configs
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import "fmt"
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// HostUID gets the root uid for the process on host which could be non-zero
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// when user namespaces are enabled.
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func (c Config) HostUID() (int, error) {
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if c.Namespaces.Contains(NEWUSER) {
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if c.UidMappings == nil {
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return -1, fmt.Errorf("User namespaces enabled, but no user mappings found.")
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}
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id, found := c.hostIDFromMapping(0, c.UidMappings)
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if !found {
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return -1, fmt.Errorf("User namespaces enabled, but no root user mapping found.")
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}
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return id, nil
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}
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// Return default root uid 0
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return 0, nil
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}
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// HostGID gets the root gid for the process on host which could be non-zero
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// when user namespaces are enabled.
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func (c Config) HostGID() (int, error) {
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if c.Namespaces.Contains(NEWUSER) {
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if c.GidMappings == nil {
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return -1, fmt.Errorf("User namespaces enabled, but no gid mappings found.")
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}
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id, found := c.hostIDFromMapping(0, c.GidMappings)
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if !found {
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return -1, fmt.Errorf("User namespaces enabled, but no root group mapping found.")
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}
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return id, nil
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}
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// Return default root gid 0
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return 0, nil
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}
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// Utility function that gets a host ID for a container ID from user namespace map
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// if that ID is present in the map.
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func (c Config) hostIDFromMapping(containerID int, uMap []IDMap) (int, bool) {
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for _, m := range uMap {
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if (containerID >= m.ContainerID) && (containerID <= (m.ContainerID + m.Size - 1)) {
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hostID := m.HostID + (containerID - m.ContainerID)
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return hostID, true
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}
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}
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return -1, false
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}
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