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Ensure nsswitch.conf config for netgo #441

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Nov 15, 2022
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Ensure nsswitch.conf config for netgo #441

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12 changes: 9 additions & 3 deletions 1.18/alpine3.15/Dockerfile
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12 changes: 9 additions & 3 deletions 1.18/alpine3.16/Dockerfile
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12 changes: 9 additions & 3 deletions 1.19/alpine3.15/Dockerfile
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12 changes: 9 additions & 3 deletions 1.19/alpine3.16/Dockerfile
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12 changes: 9 additions & 3 deletions Dockerfile-linux.template
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Original file line number Diff line number Diff line change
Expand Up @@ -10,10 +10,16 @@ FROM alpine:{{ alpine_version }}

RUN apk add --no-cache ca-certificates

# set up nsswitch.conf for Go's "netgo" implementation
# - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
# ensure that nsswitch.conf is set up for Go's "netgo" implementation
# - https://github.com/golang/go/blob/go1.19.3/src/net/conf.go#L227-L303
# - docker run --rm debian grep '^hosts:' /etc/nsswitch.conf
RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
# Alpine 3.16 includes nsswitch.conf
RUN set -eux; \
if [ -e /etc/nsswitch.conf ]; then \
grep '^hosts: files dns' /etc/nsswitch.conf; \
else \
echo 'hosts: files dns' > /etc/nsswitch.conf; \
fi
{{ ) else ( -}}
FROM buildpack-deps:{{ env.variant }}-scm

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