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history.go
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history.go
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/*
Copyright 2016 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"fmt"
"io"
"github.com/gosuri/uitable"
"github.com/spf13/cobra"
"k8s.io/helm/pkg/helm"
"k8s.io/helm/pkg/proto/hapi/chart"
"k8s.io/helm/pkg/proto/hapi/release"
"k8s.io/helm/pkg/timeconv"
)
var historyHelp = `
History prints historical revisions for a given release.
A default maximum of 256 revisions will be returned. Setting '--max'
configures the maximum length of the revision list returned.
The historical release set is printed as a formatted table, e.g:
$ helm history angry-bird --max=4
REVISION UPDATED STATUS CHART DESCRIPTION
1 Mon Oct 3 10:15:13 2016 SUPERSEDED alpine-0.1.0 Initial install
2 Mon Oct 3 10:15:13 2016 SUPERSEDED alpine-0.1.0 Upgraded successfully
3 Mon Oct 3 10:15:13 2016 SUPERSEDED alpine-0.1.0 Rolled back to 2
4 Mon Oct 3 10:15:13 2016 DEPLOYED alpine-0.1.0 Upgraded successfully
`
type historyCmd struct {
max int32
rls string
out io.Writer
helmc helm.Interface
colWidth uint
}
func newHistoryCmd(c helm.Interface, w io.Writer) *cobra.Command {
his := &historyCmd{out: w, helmc: c}
cmd := &cobra.Command{
Use: "history [flags] RELEASE_NAME",
Long: historyHelp,
Short: "fetch release history",
Aliases: []string{"hist"},
PreRunE: func(_ *cobra.Command, _ []string) error { return setupConnection() },
RunE: func(cmd *cobra.Command, args []string) error {
switch {
case len(args) == 0:
return errReleaseRequired
case his.helmc == nil:
his.helmc = newClient()
}
his.rls = args[0]
return his.run()
},
}
f := cmd.Flags()
f.Int32Var(&his.max, "max", 256, "maximum number of revision to include in history")
f.UintVar(&his.colWidth, "col-width", 60, "specifies the max column width of output")
return cmd
}
func (cmd *historyCmd) run() error {
r, err := cmd.helmc.ReleaseHistory(cmd.rls, helm.WithMaxHistory(cmd.max))
if err != nil {
return prettyError(err)
}
if len(r.Releases) == 0 {
return nil
}
fmt.Fprintln(cmd.out, formatHistory(r.Releases, cmd.colWidth))
return nil
}
func formatHistory(rls []*release.Release, colWidth uint) string {
tbl := uitable.New()
tbl.MaxColWidth = colWidth
tbl.AddRow("REVISION", "UPDATED", "STATUS", "CHART", "DESCRIPTION")
for i := len(rls) - 1; i >= 0; i-- {
r := rls[i]
c := formatChartname(r.Chart)
t := timeconv.String(r.Info.LastDeployed)
s := r.Info.Status.Code.String()
v := r.Version
d := r.Info.Description
tbl.AddRow(v, t, s, c, d)
}
return tbl.String()
}
func formatChartname(c *chart.Chart) string {
if c == nil || c.Metadata == nil {
// This is an edge case that has happened in prod, though we don't
// know how: https://github.com/kubernetes/helm/issues/1347
return "MISSING"
}
return fmt.Sprintf("%s-%s", c.Metadata.Name, c.Metadata.Version)
}