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54 lines
1.5 KiB
54 lines
1.5 KiB
#!/bin/bash -eu
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# Any failing command in a pipe will cause an error, instead
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# of just an error in the last command in the pipe
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set -o pipefail
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# Log commands executed
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set -x
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# Simple way of getting the docker build tag:
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tag=$(docker build -q - <<\EOF
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FROM debian:bullseye
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RUN apt-get update && apt-get install -y build-essential
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EOF
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)
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# But -q suppresses the log output. If you want to keep it,
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# you could use the following fancier way:
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exec {pfd}<><(:) # get a new pipe
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docker build - <<\EOF |
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FROM debian:bullseye
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RUN apt-get update && apt-get install -y build-essential
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EOF
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tee >(awk '/Successfully built/{print $3}' >&$pfd) # parse output to pipe
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read tag <&$pfd # read tag back from pipe
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exec {pfd}<&- # close pipe
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# Alternatively, you can use the -t option to docker build
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# to give the built image a name to refer to later. But then
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# you need to ensure that it does not conflict with any other
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# images, and handle cases where multiple instances of the
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# job attempt to update the tagged image.
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# If you want the image to be cleaned up on exit:
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trap "docker rmi $tag" EXIT
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# Now use the image to build something:
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docker run -i --rm \
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-v "$PWD:$PWD" \
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-w "$PWD" \
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-u $(id -u):$(id -g) \
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$tag /bin/bash -eux \
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<<EOF
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# The passed options mean we keep our current working
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# directory and user, so no permission problems on the
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# artifacts produced within the container.
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echo 'main(){puts("hello world");}' | gcc -x c -static -o hello -
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EOF
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# Test the result
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./hello
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