3923a7d3f8
This got... long... and complicated. But I think it's a really good demonstration of getting redo to do complicated things elegantly. At least, I hope it is.
34 lines
780 B
Text
34 lines
780 B
Text
redo-ifchange template.json "$1.layers"
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layers=$(cat "$1.layers")
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dir=$3.tmp
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rm -rf "$dir"
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mkdir -p "$dir"
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# Build all layers in parallel
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for layer in $layers; do
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echo "$layer.list.sha256"
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echo "$layer.layer"
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done | xargs redo-ifchange
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ids=
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parent=
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for layer in $layers; do
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read cid <$layer.list.sha256
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echo "layer: $cid $layer" >&2
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# docker seems to order its image tarballs latest-first,
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# so the base layer is last. We'll create in order from
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# base layer to final layer, but create a tarball in the
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# opposite order.
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ids="$cid $ids" # prepend
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mkdir "$dir/$cid"
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echo "1.0" >$dir/$cid/VERSION
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./dockjson.py "$layer" "$parent" >$dir/$cid/json
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ln "$layer.layer" "$dir/$cid/layer.tar"
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parent=$layer
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done <$1.layers
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tar -C "$dir" -cf - $ids >$3
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rm -rf "$dir"
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