targets: dockerfile changes in line zero #9690

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Dear sir or madam,

i got a dockerfile in which i want to update the Image Tag in the FROM Line.

I am using:

name: external-deps

sources:
  quayio-keycloak:
    kind: dockerimage
    spec:
      image: "quay.io/keycloak/keycloak"
      versionFilter:
        kind: semver

targets:
  set-keycloak-version-in-dockerfile:
      kind: dockerfile
      sourceid: quayio-keycloak
      spec:
        file: "_Keycloak/Dockerfile"
        instruction:
          keyword: FROM
          matcher: quay.io/keycloak/keycloak

FROM quay.io/keycloak/keycloak:26.4.0 AS final
WORKDIR /opt/keycloak

COPY ["providers", "providers"]
COPY ["themes", "themes"]

ENTRYPOINT ["/opt/keycloak/bin/kc.sh"]

and I am getting an error
ERROR: something went wrong in "target#set-keycloak-version-in-dockerfile" : ✗ No line found matching the keyword "FROM" and the matcher "quay.io/keycloak/keycloak"

If i add a first line it is working...

# syntax=docker/dockerfile:1
FROM quay.io/keycloak/keycloak:26.4.0 AS final
WORKDIR /opt/keycloak

COPY ["providers", "providers"]
COPY ["themes", "themes"]

ENTRYPOINT ["/opt/keycloak/bin/kc.sh"]

Expected Behavior

It should run the change to the current major version in both cases.

Steps To Reproduce

1. Create a Dockerfile

FROM quay.io/keycloak/keycloak:26.4.0 AS final
WORKDIR /opt/keycloak

COPY ["providers", "providers"]
COPY ["themes", "themes"]

ENTRYPOINT ["/opt/keycloak/bin/kc.sh"]

2. Create an manifest.yaml

name: external-deps

sources:
  quayio-keycloak:
    kind: dockerimage
    spec:
      image: "quay.io/keycloak/keycloak"
      versionFilter:
        kind: semver

targets:
  set-keycloak-version-in-dockerfile:
      kind: dockerfile
      sourceid: quayio-keycloak
      spec:
        file: "_Keycloak/Dockerfile"
        instruction:
          keyword: FROM
          matcher: quay.io/keycloak/keycloak

5. run "updatecli --debug pipeline apply --config manifest.yaml"

Environment

- OS:
Linux XXXXXX 5.15.153.1-microsoft-standard-WSL2 #1 SMP Fri Mar 29 23:14:13 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux ("WSL" "Ubuntu Jammy")
- updatecli:
VERSION

Application:    0.119.0
Golang     :    1.26.5 linux/amd64
Build Time :    2026-07-09T15:27:02Z

Pipeline Graph

OpenTelemetry Trace

No response

Anything else?

No response