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Merge pull request #19630 from rhatdan/kube
Expand env variables for cmds/entrypoint with format $(ENV)
This commit is contained in:
OpenShift Merge Robot
1
go.mod
1
go.mod
@ -71,6 +71,7 @@ require (
|
||||
google.golang.org/protobuf v1.31.0
|
||||
gopkg.in/inf.v0 v0.9.1
|
||||
gopkg.in/yaml.v3 v3.0.1
|
||||
k8s.io/kubernetes v1.28.0
|
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sigs.k8s.io/yaml v1.3.0
|
||||
)
|
||||
|
||||
|
||||
8
go.sum
8
go.sum
@ -1525,6 +1525,7 @@ k8s.io/api v0.20.6/go.mod h1:X9e8Qag6JV/bL5G6bU8sdVRltWKmdHsFUGS3eVndqE8=
|
||||
k8s.io/apimachinery v0.20.1/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
|
||||
k8s.io/apimachinery v0.20.4/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
|
||||
k8s.io/apimachinery v0.20.6/go.mod h1:ejZXtW1Ra6V1O5H8xPBGz+T3+4gfkTCeExAHKU57MAc=
|
||||
k8s.io/apimachinery v0.26.5 h1:hTQVhJao2piX7vSgCn4Lwd6E0o/+TJIH4NqRf+q4EmE=
|
||||
k8s.io/apiserver v0.20.1/go.mod h1:ro5QHeQkgMS7ZGpvf4tSMx6bBOgPfE+f52KwvXfScaU=
|
||||
k8s.io/apiserver v0.20.4/go.mod h1:Mc80thBKOyy7tbvFtB4kJv1kbdD0eIH8k8vianJcbFM=
|
||||
k8s.io/apiserver v0.20.6/go.mod h1:QIJXNt6i6JB+0YQRNcS0hdRHJlMhflFmsBDeSgT1r8Q=
|
||||
@ -1542,22 +1543,29 @@ k8s.io/cri-api v0.20.6/go.mod h1:ew44AjNXwyn1s0U4xCKGodU7J1HzBeZ1MpGrpa5r8Yc=
|
||||
k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
|
||||
k8s.io/gengo v0.0.0-20200428234225-8167cfdcfc14/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
|
||||
k8s.io/gengo v0.0.0-20201113003025-83324d819ded/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
|
||||
k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
|
||||
k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
|
||||
k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
|
||||
k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
|
||||
k8s.io/klog/v2 v2.100.1 h1:7WCHKK6K8fNhTqfBhISHQ97KrnJNFZMcQvKp7gP/tmg=
|
||||
k8s.io/kube-openapi v0.0.0-20200805222855-6aeccd4b50c6/go.mod h1:UuqjUnNftUyPE5H64/qeyjQoUZhGpeFDVdxjTeEVN2o=
|
||||
k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd/go.mod h1:WOJ3KddDSol4tAGcJo0Tvi+dK12EcqSLqcWsryKMpfM=
|
||||
k8s.io/kubernetes v1.13.0/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
|
||||
k8s.io/kubernetes v1.28.0 h1:p8qq/VoNHnBWinLEi5LO2IvCfzFouN7Jhdz8+L++V+U=
|
||||
k8s.io/kubernetes v1.28.0/go.mod h1:rBQpjGYlLBV0KuOLw8EG45N5EBCskWiPpi0xy5liHMI=
|
||||
k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
|
||||
k8s.io/utils v0.0.0-20230505201702-9f6742963106 h1:EObNQ3TW2D+WptiYXlApGNLVy0zm/JIBVY9i+M4wpAU=
|
||||
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
|
||||
rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
|
||||
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
|
||||
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
|
||||
sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.14/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
|
||||
sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.15/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
|
||||
sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
|
||||
sigs.k8s.io/structured-merge-diff/v4 v4.0.1/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
|
||||
sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
|
||||
sigs.k8s.io/structured-merge-diff/v4 v4.0.3/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
|
||||
sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE=
|
||||
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
|
||||
sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
|
||||
sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo=
|
||||
|
||||
@ -36,6 +36,7 @@ import (
|
||||
"github.com/opencontainers/selinux/go-selinux"
|
||||
"github.com/sirupsen/logrus"
|
||||
yamlv3 "gopkg.in/yaml.v3"
|
||||
"k8s.io/kubernetes/third_party/forked/golang/expansion"
|
||||
"sigs.k8s.io/yaml"
|
||||
)
|
||||
|
||||
@ -82,6 +83,7 @@ func (ic *ContainerEngine) createServiceContainer(ctx context.Context, name stri
|
||||
}
|
||||
s.Name = name
|
||||
|
||||
expandForKube(s)
|
||||
runtimeSpec, spec, opts, err := generate.MakeContainer(ctx, ic.Libpod, s, false, nil)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("creating runtime spec for service container: %w", err)
|
||||
@ -786,6 +788,7 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
|
||||
}
|
||||
|
||||
specGen.SdNotifyMode = define.SdNotifyModeIgnore
|
||||
expandForKube(specGen)
|
||||
rtSpec, spec, opts, err := generate.MakeContainer(ctx, ic.Libpod, specGen, false, nil)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
@ -854,6 +857,7 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
|
||||
}
|
||||
|
||||
specGen.RawImageName = container.Image
|
||||
expandForKube(specGen)
|
||||
rtSpec, spec, opts, err := generate.MakeContainer(ctx, ic.Libpod, specGen, false, nil)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
@ -1574,3 +1578,13 @@ func getMountLabel(securityContext *v1.PodSecurityContext) (string, error) {
|
||||
}
|
||||
return con.Get(), nil
|
||||
}
|
||||
|
||||
func expandForKube(s *specgen.SpecGenerator) {
|
||||
mapping := expansion.MappingFuncFor(s.Env)
|
||||
for i, subCmd := range s.Entrypoint {
|
||||
s.Entrypoint[i] = expansion.Expand(subCmd, mapping)
|
||||
}
|
||||
for i, subCmd := range s.Command {
|
||||
s.Command[i] = expansion.Expand(subCmd, mapping)
|
||||
}
|
||||
}
|
||||
|
||||
@ -278,4 +278,95 @@ LABEL marge=mom
|
||||
Expect(inspectData[0].Config.Labels).To(Not(HaveKey("marge")))
|
||||
})
|
||||
|
||||
var testYAMLForEnvExpand = `
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
creationTimestamp: "2021-08-05T17:55:51Z"
|
||||
labels:
|
||||
app: foobar
|
||||
name: echo_pod
|
||||
spec:
|
||||
containers:
|
||||
- command:
|
||||
- /bin/sh
|
||||
- -c
|
||||
- 'echo paren$(FOO) brace${FOO} dollardollarparen$$(FOO) interp$(FOO)olate'
|
||||
env:
|
||||
- name: PATH
|
||||
value: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
|
||||
- name: TERM
|
||||
value: xterm
|
||||
- name: container
|
||||
value: podman
|
||||
- name: FOO
|
||||
value: BAR
|
||||
image: foobar
|
||||
name: foobar
|
||||
resources: {}
|
||||
securityContext:
|
||||
allowPrivilegeEscalation: true
|
||||
privileged: false
|
||||
readOnlyRootFilesystem: false
|
||||
seLinuxOptions: {}
|
||||
tty: true
|
||||
workingDir: /
|
||||
restartPolicy: Never
|
||||
dnsConfig: {}
|
||||
status: {}
|
||||
`
|
||||
It("Check that command is expanded", func() {
|
||||
// Setup
|
||||
yamlDir := filepath.Join(tempdir, RandomString(12))
|
||||
err := os.Mkdir(yamlDir, 0755)
|
||||
Expect(err).ToNot(HaveOccurred(), "mkdir "+yamlDir)
|
||||
err = writeYaml(testYAMLForEnvExpand, filepath.Join(yamlDir, "echo.yaml"))
|
||||
Expect(err).ToNot(HaveOccurred())
|
||||
app1Dir := filepath.Join(yamlDir, "foobar")
|
||||
err = os.Mkdir(app1Dir, 0755)
|
||||
Expect(err).ToNot(HaveOccurred())
|
||||
err = writeYaml(playBuildFile+`ENV FOO foo-from-buildfile
|
||||
COPY FOO /bin/FOO
|
||||
`, filepath.Join(app1Dir, "Containerfile"))
|
||||
Expect(err).ToNot(HaveOccurred())
|
||||
// Write a file to be copied
|
||||
err = writeYaml(copyFile, filepath.Join(app1Dir, "copyfile"))
|
||||
Expect(err).ToNot(HaveOccurred())
|
||||
|
||||
// Shell expansion of $(FOO) in container needs executable FOO
|
||||
err = writeYaml(`#!/bin/sh
|
||||
echo GOT-HERE
|
||||
`, filepath.Join(app1Dir, "FOO"))
|
||||
Expect(err).ToNot(HaveOccurred())
|
||||
err = os.Chmod(filepath.Join(app1Dir, "FOO"), 0555)
|
||||
Expect(err).ToNot(HaveOccurred(), "chmod FOO")
|
||||
|
||||
os.Setenv("FOO", "make sure we use FOO from kube file, not env")
|
||||
defer os.Unsetenv("FOO")
|
||||
|
||||
// Switch to temp dir and restore it afterwards
|
||||
cwd, err := os.Getwd()
|
||||
Expect(err).ToNot(HaveOccurred())
|
||||
Expect(os.Chdir(yamlDir)).To(Succeed())
|
||||
defer func() { (Expect(os.Chdir(cwd)).To(BeNil())) }()
|
||||
|
||||
session := podmanTest.Podman([]string{"play", "kube", "echo.yaml"})
|
||||
session.WaitWithDefaultTimeout()
|
||||
Expect(session).Should(Exit(0))
|
||||
|
||||
logs := podmanTest.Podman([]string{"logs", "echo_pod-foobar"})
|
||||
logs.WaitWithDefaultTimeout()
|
||||
Expect(logs).Should(Exit(0))
|
||||
Expect(logs.OutputToString()).To(Equal("parenBAR braceBAR dollardollarparenGOT-HERE interpBARolate"))
|
||||
|
||||
inspect := podmanTest.Podman([]string{"container", "inspect", "echo_pod-foobar"})
|
||||
inspect.WaitWithDefaultTimeout()
|
||||
Expect(inspect).Should(Exit(0))
|
||||
inspectData := inspect.InspectContainerToJSON()
|
||||
Expect(inspectData).ToNot(BeEmpty())
|
||||
|
||||
// dollar-paren are expanded by podman, never seen by container
|
||||
Expect(inspectData[0].Args).To(HaveLen(2))
|
||||
Expect(inspectData[0].Args[1]).To(Equal("echo parenBAR brace${FOO} dollardollarparen$(FOO) interpBARolate"))
|
||||
})
|
||||
})
|
||||
|
||||
202
vendor/k8s.io/kubernetes/LICENSE
generated
vendored
Normal file
202
vendor/k8s.io/kubernetes/LICENSE
generated
vendored
Normal file
@ -0,0 +1,202 @@
|
||||
|
||||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
|
||||
|
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1. Definitions.
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||||
"License" shall mean the terms and conditions for use, reproduction,
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||||
by You to the Licensor shall be under the terms and conditions of
|
||||
this License, without any additional terms or conditions.
|
||||
Notwithstanding the above, nothing herein shall supersede or modify
|
||||
the terms of any separate license agreement you may have executed
|
||||
with Licensor regarding such Contributions.
|
||||
|
||||
6. Trademarks. This License does not grant permission to use the trade
|
||||
names, trademarks, service marks, or product names of the Licensor,
|
||||
except as required for reasonable and customary use in describing the
|
||||
origin of the Work and reproducing the content of the NOTICE file.
|
||||
|
||||
7. Disclaimer of Warranty. Unless required by applicable law or
|
||||
agreed to in writing, Licensor provides the Work (and each
|
||||
Contributor provides its Contributions) on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
||||
implied, including, without limitation, any warranties or conditions
|
||||
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
|
||||
PARTICULAR PURPOSE. You are solely responsible for determining the
|
||||
appropriateness of using or redistributing the Work and assume any
|
||||
risks associated with Your exercise of permissions under this License.
|
||||
|
||||
8. Limitation of Liability. In no event and under no legal theory,
|
||||
whether in tort (including negligence), contract, or otherwise,
|
||||
unless required by applicable law (such as deliberate and grossly
|
||||
negligent acts) or agreed to in writing, shall any Contributor be
|
||||
liable to You for damages, including any direct, indirect, special,
|
||||
incidental, or consequential damages of any character arising as a
|
||||
result of this License or out of the use or inability to use the
|
||||
Work (including but not limited to damages for loss of goodwill,
|
||||
work stoppage, computer failure or malfunction, or any and all
|
||||
other commercial damages or losses), even if such Contributor
|
||||
has been advised of the possibility of such damages.
|
||||
|
||||
9. Accepting Warranty or Additional Liability. While redistributing
|
||||
the Work or Derivative Works thereof, You may choose to offer,
|
||||
and charge a fee for, acceptance of support, warranty, indemnity,
|
||||
or other liability obligations and/or rights consistent with this
|
||||
License. However, in accepting such obligations, You may act only
|
||||
on Your own behalf and on Your sole responsibility, not on behalf
|
||||
of any other Contributor, and only if You agree to indemnify,
|
||||
defend, and hold each Contributor harmless for any liability
|
||||
incurred by, or claims asserted against, such Contributor by reason
|
||||
of your accepting any such warranty or additional liability.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
APPENDIX: How to apply the Apache License to your work.
|
||||
|
||||
To apply the Apache License to your work, attach the following
|
||||
boilerplate notice, with the fields enclosed by brackets "[]"
|
||||
replaced with your own identifying information. (Don't include
|
||||
the brackets!) The text should be enclosed in the appropriate
|
||||
comment syntax for the file format. We also recommend that a
|
||||
file or class name and description of purpose be included on the
|
||||
same "printed page" as the copyright notice for easier
|
||||
identification within third-party archives.
|
||||
|
||||
Copyright [yyyy] [name of copyright owner]
|
||||
|
||||
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.
|
||||
27
vendor/k8s.io/kubernetes/third_party/forked/golang/LICENSE
generated
vendored
Normal file
27
vendor/k8s.io/kubernetes/third_party/forked/golang/LICENSE
generated
vendored
Normal file
@ -0,0 +1,27 @@
|
||||
Copyright (c) 2009 The Go Authors. All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are
|
||||
met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above
|
||||
copyright notice, this list of conditions and the following disclaimer
|
||||
in the documentation and/or other materials provided with the
|
||||
distribution.
|
||||
* Neither the name of Google Inc. nor the names of its
|
||||
contributors may be used to endorse or promote products derived from
|
||||
this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
22
vendor/k8s.io/kubernetes/third_party/forked/golang/PATENTS
generated
vendored
Normal file
22
vendor/k8s.io/kubernetes/third_party/forked/golang/PATENTS
generated
vendored
Normal file
@ -0,0 +1,22 @@
|
||||
Additional IP Rights Grant (Patents)
|
||||
|
||||
"This implementation" means the copyrightable works distributed by
|
||||
Google as part of the Go project.
|
||||
|
||||
Google hereby grants to You a perpetual, worldwide, non-exclusive,
|
||||
no-charge, royalty-free, irrevocable (except as stated in this section)
|
||||
patent license to make, have made, use, offer to sell, sell, import,
|
||||
transfer and otherwise run, modify and propagate the contents of this
|
||||
implementation of Go, where such license applies only to those patent
|
||||
claims, both currently owned or controlled by Google and acquired in
|
||||
the future, licensable by Google that are necessarily infringed by this
|
||||
implementation of Go. This grant does not include claims that would be
|
||||
infringed only as a consequence of further modification of this
|
||||
implementation. If you or your agent or exclusive licensee institute or
|
||||
order or agree to the institution of patent litigation against any
|
||||
entity (including a cross-claim or counterclaim in a lawsuit) alleging
|
||||
that this implementation of Go or any code incorporated within this
|
||||
implementation of Go constitutes direct or contributory patent
|
||||
infringement, or inducement of patent infringement, then any patent
|
||||
rights granted to you under this License for this implementation of Go
|
||||
shall terminate as of the date such litigation is filed.
|
||||
102
vendor/k8s.io/kubernetes/third_party/forked/golang/expansion/expand.go
generated
vendored
Normal file
102
vendor/k8s.io/kubernetes/third_party/forked/golang/expansion/expand.go
generated
vendored
Normal file
@ -0,0 +1,102 @@
|
||||
package expansion
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
)
|
||||
|
||||
const (
|
||||
operator = '$'
|
||||
referenceOpener = '('
|
||||
referenceCloser = ')'
|
||||
)
|
||||
|
||||
// syntaxWrap returns the input string wrapped by the expansion syntax.
|
||||
func syntaxWrap(input string) string {
|
||||
return string(operator) + string(referenceOpener) + input + string(referenceCloser)
|
||||
}
|
||||
|
||||
// MappingFuncFor returns a mapping function for use with Expand that
|
||||
// implements the expansion semantics defined in the expansion spec; it
|
||||
// returns the input string wrapped in the expansion syntax if no mapping
|
||||
// for the input is found.
|
||||
func MappingFuncFor(context ...map[string]string) func(string) string {
|
||||
return func(input string) string {
|
||||
for _, vars := range context {
|
||||
val, ok := vars[input]
|
||||
if ok {
|
||||
return val
|
||||
}
|
||||
}
|
||||
|
||||
return syntaxWrap(input)
|
||||
}
|
||||
}
|
||||
|
||||
// Expand replaces variable references in the input string according to
|
||||
// the expansion spec using the given mapping function to resolve the
|
||||
// values of variables.
|
||||
func Expand(input string, mapping func(string) string) string {
|
||||
var buf bytes.Buffer
|
||||
checkpoint := 0
|
||||
for cursor := 0; cursor < len(input); cursor++ {
|
||||
if input[cursor] == operator && cursor+1 < len(input) {
|
||||
// Copy the portion of the input string since the last
|
||||
// checkpoint into the buffer
|
||||
buf.WriteString(input[checkpoint:cursor])
|
||||
|
||||
// Attempt to read the variable name as defined by the
|
||||
// syntax from the input string
|
||||
read, isVar, advance := tryReadVariableName(input[cursor+1:])
|
||||
|
||||
if isVar {
|
||||
// We were able to read a variable name correctly;
|
||||
// apply the mapping to the variable name and copy the
|
||||
// bytes into the buffer
|
||||
buf.WriteString(mapping(read))
|
||||
} else {
|
||||
// Not a variable name; copy the read bytes into the buffer
|
||||
buf.WriteString(read)
|
||||
}
|
||||
|
||||
// Advance the cursor in the input string to account for
|
||||
// bytes consumed to read the variable name expression
|
||||
cursor += advance
|
||||
|
||||
// Advance the checkpoint in the input string
|
||||
checkpoint = cursor + 1
|
||||
}
|
||||
}
|
||||
|
||||
// Return the buffer and any remaining unwritten bytes in the
|
||||
// input string.
|
||||
return buf.String() + input[checkpoint:]
|
||||
}
|
||||
|
||||
// tryReadVariableName attempts to read a variable name from the input
|
||||
// string and returns the content read from the input, whether that content
|
||||
// represents a variable name to perform mapping on, and the number of bytes
|
||||
// consumed in the input string.
|
||||
//
|
||||
// The input string is assumed not to contain the initial operator.
|
||||
func tryReadVariableName(input string) (string, bool, int) {
|
||||
switch input[0] {
|
||||
case operator:
|
||||
// Escaped operator; return it.
|
||||
return input[0:1], false, 1
|
||||
case referenceOpener:
|
||||
// Scan to expression closer
|
||||
for i := 1; i < len(input); i++ {
|
||||
if input[i] == referenceCloser {
|
||||
return input[1:i], true, i + 1
|
||||
}
|
||||
}
|
||||
|
||||
// Incomplete reference; return it.
|
||||
return string(operator) + string(referenceOpener), false, 1
|
||||
default:
|
||||
// Not the beginning of an expression, ie, an operator
|
||||
// that doesn't begin an expression. Return the operator
|
||||
// and the first rune in the string.
|
||||
return (string(operator) + string(input[0])), false, 1
|
||||
}
|
||||
}
|
||||
3
vendor/modules.txt
vendored
3
vendor/modules.txt
vendored
@ -1258,6 +1258,9 @@ gopkg.in/yaml.v2
|
||||
# gopkg.in/yaml.v3 v3.0.1
|
||||
## explicit
|
||||
gopkg.in/yaml.v3
|
||||
# k8s.io/kubernetes v1.28.0
|
||||
## explicit; go 1.20
|
||||
k8s.io/kubernetes/third_party/forked/golang/expansion
|
||||
# sigs.k8s.io/yaml v1.3.0
|
||||
## explicit; go 1.12
|
||||
sigs.k8s.io/yaml
|
||||
|
||||
Reference in New Issue
Block a user