Tekton build Docker image with Kaniko - please provide a valid path to a Dockerfile within the build context with --dockerfile - tekton

Question

I am new to Tekton (https://tekton.dev/) and I am trying to
Clone the repository
Build a docker image with the Dockerfile
I have a Tekton pipeline and when I try to execute it, I get the following error:
Error: error resolving dockerfile path: please provide a valid path to a Dockerfile within the build context with --dockerfile
Please find the Tekton manifests below:
1. Pipeline.yml
apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
name: clone-read
spec:
description: |
This pipeline clones a git repo, then echoes the README file to the stout.
params:
- name: repo-url
type: string
description: The git repo URL to clone from.
- name: image-name
type: string
description: for Kaniko
- name: image-path
type: string
description: path of Dockerfile for Kaniko
workspaces:
- name: shared-data
description: |
This workspace contains the cloned repo files, so they can be read by the
next task.
tasks:
- name: fetch-source
taskRef:
name: git-clone
workspaces:
- name: output
workspace: shared-data
params:
- name: url
value: $(params.repo-url)
- name: show-readme
runAfter: ["fetch-source"]
taskRef:
name: show-readme
workspaces:
- name: source
workspace: shared-data
- name: build-push
runAfter: ["show-readme"]
taskRef:
name: kaniko
workspaces:
- name: source
workspace: shared-data
params:
- name: IMAGE
value: $(params.image-name)
- name: CONTEXT
value: $(params.image-path)
1. PipelineRun.yml
apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
name: clone-read-run
spec:
pipelineRef:
name: clone-read
podTemplate:
securityContext:
fsGroup: 65532
workspaces:
- name: shared-data
volumeClaimTemplate:
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
# - name: git-credentials
# secret:
# secretName: git-credentials
params:
- name: repo-url
value: https://github.com/iamdempa/tekton-demos.git
- name: image-name
value: "python-test"
- name: image-path
value: $(workspaces.shared-data.path)/BuildDockerImage2
And here's my repository structure:
. . .
.
├── BuildDockerImage2
│ ├── 1.show-readme.yml
│ ├── 2. Pipeline.yml
│ ├── 3. PipelineRun.yml
│ └── Dockerfile
├── README.md
. . .
7 directories, 25 files
Could someone help me what is wrong here?
Thank you

Answer 1

I was able to find the issue. Issue was with the way I have provided the path.
In the kaniko task, the CONTEXT variable determines the path of the Dockerfile. And the default value is set to ./ and with some additional prefix as below:
$(workspaces.source.path)/$(params.CONTEXT)
That mean, the path of the workspaces is already being appended and I don't need to append that part as I mentioned in the image-path value below:
$(workspaces.shared-data.path)/BuildDockerImage2
Instead, I had to put just the folder name as below:
- name: image-path
value: BuildDockerImage2
This fixed the problem I had.