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113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
package updater
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import (
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"github.com/samalba/dockerclient"
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)
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// Ideally, we'd just be able to take the ContainerConfig from the old container
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// and use it as the starting point for creating the new container; however,
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// the ContainerConfig that comes back from the Inspect call merges the default
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// configuration (the stuff specified in the metadata for the image itself)
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// with the overridden configuration (the stuff that you might specify as part
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// of the "docker run"). In order to avoid unintentionally overriding the
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// defaults in the new image we need to separate the override options from the
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// default options. To do this we have to compare the ContainerConfig for the
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// running container with the ContainerConfig from the image that container was
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// started from. This function returns a ContainerConfig which contains just
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// the override options.
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func GenerateContainerConfig(oldContainerInfo *dockerclient.ContainerInfo, oldImageConfig *dockerclient.ContainerConfig) *dockerclient.ContainerConfig {
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config := oldContainerInfo.Config
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if config.WorkingDir == oldImageConfig.WorkingDir {
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config.WorkingDir = ""
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}
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if config.User == oldImageConfig.User {
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config.User = ""
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}
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if sliceEqual(config.Cmd, oldImageConfig.Cmd) {
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config.Cmd = []string{}
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}
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if sliceEqual(config.Entrypoint, oldImageConfig.Entrypoint) {
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config.Entrypoint = []string{}
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}
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config.Env = arraySubtract(config.Env, oldImageConfig.Env)
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config.Labels = stringMapSubtract(config.Labels, oldImageConfig.Labels)
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config.Volumes = structMapSubtract(config.Volumes, oldImageConfig.Volumes)
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config.ExposedPorts = structMapSubtract(config.ExposedPorts, oldImageConfig.ExposedPorts)
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for p, _ := range oldContainerInfo.HostConfig.PortBindings {
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config.ExposedPorts[p] = struct{}{}
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}
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return config
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}
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func sliceEqual(s1, s2 []string) bool {
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if len(s1) != len(s2) {
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return false
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}
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for i := range s1 {
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if s1[i] != s2[i] {
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return false
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}
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}
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return true
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}
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func stringMapSubtract(m1, m2 map[string]string) map[string]string {
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m := map[string]string{}
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for k1, v1 := range m1 {
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if v2, ok := m2[k1]; ok {
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if v2 != v1 {
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m[k1] = v1
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}
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} else {
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m[k1] = v1
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}
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}
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return m
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}
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func structMapSubtract(m1, m2 map[string]struct{}) map[string]struct{} {
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m := map[string]struct{}{}
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for k1, v1 := range m1 {
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if _, ok := m2[k1]; !ok {
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m[k1] = v1
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}
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}
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return m
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}
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func arraySubtract(a1, a2 []string) []string {
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a := []string{}
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for _, e1 := range a1 {
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found := false
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for _, e2 := range a2 {
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if e1 == e2 {
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found = true
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break
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}
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}
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if !found {
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a = append(a, e1)
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}
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}
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return a
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}
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