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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| package cmd | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
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| "github.com/felicianotech/sonar/sonar/docker" | ||
| "github.com/spf13/cobra" | ||
|
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| semver "github.com/hashicorp/go-version" | ||
| ) | ||
|
|
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| var ( | ||
| method string | ||
|
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| headCmd = &cobra.Command{ | ||
| Use: "head <image-name>", | ||
| Short: "Returns the head (sequentially last) tag of the image", | ||
| Long: `Returns what is considered to be the most recent or latest tag for | ||
| an image, based on a criteria. By default, this criteria (or method) is date | ||
| but SemVer is also supported.`, | ||
| Args: cobra.ExactArgs(1), | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
|
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| dockerTags, err := docker.GetAllTags(args[0]) | ||
| if err != nil { | ||
| return fmt.Errorf("Failed retrieving Docker tags: %s", err) | ||
| } else if len(dockerTags) == 0 { | ||
| return fmt.Errorf("The image %s doesn't have any tags.", args[0]) | ||
| } | ||
|
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| // start off with the first tag before we start comparing so that | ||
| // we're not comparing nil | ||
| headTag := dockerTags[0] | ||
|
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| for _, tag := range dockerTags { | ||
|
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| if method == "date" { | ||
|
|
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| if tag.Date.After(headTag.Date) { | ||
| headTag = tag | ||
| } | ||
| } else if method == "semver" { | ||
|
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| headTagV, err := semver.NewSemver(headTag.Name) | ||
| if err != nil { | ||
| // headTag isn't a semver tag so let's reset to the current | ||
| // tag in the loop and start over | ||
| headTag = tag | ||
| continue | ||
| } | ||
|
|
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| tagV, err := semver.NewSemver(tag.Name) | ||
| if err != nil { | ||
| // the tag to compare isn't a semver tag so let's skip | ||
| continue | ||
| } | ||
|
|
||
| if headTagV.LessThan(tagV) { | ||
| headTag = tag | ||
| } | ||
| } | ||
| } | ||
|
|
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| if method == "semver" { | ||
|
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| _, err := semver.NewSemver(headTag.Name) | ||
| if err != nil { | ||
| return fmt.Errorf("The image %s doesn't contain at least 1 valid semver tag.", args[0]) | ||
| } | ||
| } | ||
|
|
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| fmt.Println(headTag.Name) | ||
|
|
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| return nil | ||
| }, | ||
| } | ||
| ) | ||
|
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| func init() { | ||
|
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| headCmd.PersistentFlags().StringP("method", "m", "date", "Criteria to calculate the head tag. Supported values are 'date' (default) or 'semver'.") | ||
| tagsCmd.AddCommand(headCmd) | ||
| } |