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https://github.com/k3s-io/k3s.git
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51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
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// Copyright 2020 The Kubernetes Authors.
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// SPDX-License-Identifier: Apache-2.0
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package image
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import (
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"regexp"
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"strings"
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)
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// IsImageMatched returns true if the value of t is identical to the
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// image name in the full image name and tag as given by s.
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func IsImageMatched(s, t string) bool {
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// Tag values are limited to [a-zA-Z0-9_.{}-].
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// Some tools like Bazel rules_k8s allow tag patterns with {} characters.
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// More info: https://github.com/bazelbuild/rules_k8s/pull/423
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pattern, _ := regexp.Compile("^" + t + "(@sha256)?(:[a-zA-Z0-9_.{}-]*)?$")
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return pattern.MatchString(s)
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}
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// Split separates and returns the name and tag parts
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// from the image string using either colon `:` or at `@` separators.
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// Note that the returned tag keeps its separator.
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func Split(imageName string) (name string, tag string) {
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// check if image name contains a domain
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// if domain is present, ignore domain and check for `:`
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ic := -1
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if slashIndex := strings.Index(imageName, "/"); slashIndex < 0 {
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ic = strings.LastIndex(imageName, ":")
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} else {
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lastIc := strings.LastIndex(imageName[slashIndex:], ":")
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// set ic only if `:` is present
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if lastIc > 0 {
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ic = slashIndex + lastIc
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}
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}
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ia := strings.LastIndex(imageName, "@")
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if ic < 0 && ia < 0 {
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return imageName, ""
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}
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i := ic
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if ia > 0 {
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i = ia
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}
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name = imageName[:i]
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tag = imageName[i:]
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return
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}
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