68 lines
1.8 KiB
Text
68 lines
1.8 KiB
Text
#! @shell@
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WORKING_DIRECTORY=$(mktemp -d "${TMPDIR:-/tmp}"/nix-reduce-build-XXXXXX);
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cd "$WORKING_DIRECTORY";
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if test -z "$1" ; then
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echo 'nix-reduce-build (paths or Nix expressions) -- (logins at remote computers)' >&2
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echo As in: >&2
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echo nix-reduce-build /etc/nixos/nixos -- user@somewhere.nowhere.example.org >&2
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exit;
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fi;
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while ! test "$1" = "--" || test "$1" = "" ; do
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echo "$1" >> initial; >&2
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shift;
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done
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shift;
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echo Will work on $(cat initial | wc -l) targets. >&2
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while read ; do
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case "$REPLY" in
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${NIX_STORE_PATH:-/nix/store}/*)
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echo "$REPLY" >> paths; >&2
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;;
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*)
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nix-instantiate "$REPLY" >> paths;
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;;
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esac;
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done < initial;
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echo Proceeding $(cat paths | wc -l) paths. >&2
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while read; do
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case "$REPLY" in
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*.drv)
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echo "$REPLY" >> derivers; >&2
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;;
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*)
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nix-store --query --deriver "$REPLY" >>derivers;
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;;
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esac;
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done < paths;
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echo Found $(cat derivers | wc -l) derivers. >&2
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cat derivers | xargs nix-store --query -R > derivers-closure;
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echo Proceeding at most $(cat derivers-closure | wc -l) derivers. >&2
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cat derivers-closure | egrep '[.]drv$' | xargs nix-store --query --outputs > wanted-paths;
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cat derivers-closure | egrep -v '[.]drv$' >> wanted-paths;
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echo Prepared $(cat wanted-paths | wc -l) paths to get. >&2
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cat wanted-paths | xargs nix-store --check-validity --print-invalid > needed-paths;
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echo We need $(cat needed-paths | wc -l) paths. >&2
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if test -z "$1" ; then
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cat needed-paths;
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fi;
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for i in "$@"; do
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cat needed-paths | while read; do
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nix-copy-closure --from "$i" --gzip "$REPLY" </dev/null || true;
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done;
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mv needed-paths wanted-paths;
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cat wanted-paths | xargs nix-store --check-validity --print-invalid > needed-paths;
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echo We still need $(cat needed-paths | wc -l) paths. >&2
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done;
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cd /
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rm -r "$WORKING_DIRECTORY"
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