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Signed-off-by: Gustavo Carvalho <gustavo.carvalho@container-solutions.com>
WalkthroughThe Dockerfile.standalone builder stage was restructured by moving the Changes
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Actionable comments posted: 1
Fix all issues with AI Agents 🤖
In @Dockerfile.standalone:
- Around line 11-12: The Dockerfile currently runs "RUN go mod download" after
"COPY . /app/", which invalidates layer caching; change the Dockerfile to first
COPY only dependency files (COPY go.mod go.sum ./), run "go mod download" to
cache module downloads, and then COPY the rest of the application source (e.g.,
COPY . /app/) so that modifying app code won't re-run the module download step.
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Dockerfile.standalone
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| COPY . /app/ | ||
| RUN go mod download |
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Docker layer caching is broken by this change.
Moving go mod download after COPY . /app/ breaks Docker's layer caching optimization. Now, any application code change invalidates the COPY layer, forcing dependencies to re-download on every build even when go.mod/go.sum haven't changed.
Best practice: copy only dependency files first, download modules, then copy the rest of the code.
🔎 Proposed fix to restore layer caching
WORKDIR /app
-COPY . /app/
+COPY go.mod go.sum /app/
RUN go mod download
+COPY . /app/
RUN go build -o external-secrets main.goThis ensures go mod download is cached unless go.mod or go.sum changes, dramatically speeding up builds when only application code is modified.
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| COPY . /app/ | |
| RUN go mod download | |
| WORKDIR /app | |
| COPY go.mod go.sum /app/ | |
| RUN go mod download | |
| COPY . /app/ | |
| RUN go build -o external-secrets main.go |
🤖 Prompt for AI Agents
In @Dockerfile.standalone around lines 11-12, The Dockerfile currently runs "RUN
go mod download" after "COPY . /app/", which invalidates layer caching; change
the Dockerfile to first COPY only dependency files (COPY go.mod go.sum ./), run
"go mod download" to cache module downloads, and then COPY the rest of the
application source (e.g., COPY . /app/) so that modifying app code won't re-run
the module download step.
Signed-off-by: Gustavo Carvalho <gustavo.carvalho@container-solutions.com>
Dockerfile.standalone Changes
Modified the builder stage's dependency handling:
go.modandgo.sumbefore dependency downloadCOPY . /app/), then executeRUN go mod downloadThis simplifies the build process but removes a caching optimization that previously prevented cache invalidation when only source code changed.