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dockerTools.buildLayeredImage: prepare to exclude some paths

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Without changing behavior, since this code is fiddly, make it possible
to add a filtering step before packaging individual paths.
This commit is contained in:
Graham Christensen 2019-12-16 12:57:04 -05:00
parent aec80dddc0
commit 700f4c5388
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1 changed files with 8 additions and 3 deletions
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11
pkgs/build-support/docker/default.nix
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@ -319,15 +319,20 @@ rec {
| jshon -d config \
| jshon -s "1970-01-01T00:00:01Z" -i created > generic.json
# WARNING!
# The following code is fiddly w.r.t. ensuring every layer is
# created, and that no paths are missed. If you change the
# following head and tail call lines, double-check that your
# code behaves properly when the number of layers equals:
# maxLayers-1, maxLayers, and maxLayers+1
head -n $((maxLayers - 1)) $paths | cat -n | xargs -P$NIX_BUILD_CORES -n2 ${storePathToLayer}
if [ $(cat $paths | wc -l) -ge $maxLayers ]; then
tail -n+$maxLayers $paths | xargs ${storePathToLayer} $maxLayers
paths() {
cat $paths
}
paths | head -n $((maxLayers - 1)) | cat -n | xargs -P$NIX_BUILD_CORES -n2 ${storePathToLayer}
if [ $(paths | wc -l) -ge $maxLayers ]; then
paths | tail -n+$maxLayers | xargs ${storePathToLayer} $maxLayers
fi
echo "Finished building layer '$name'"