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https://github.com/NixOS/nixpkgs.git
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54 lines
1.7 KiB
Nix
54 lines
1.7 KiB
Nix
{ lib, stdenv }:
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{ paths, disabledDefaultBackends ? [] }:
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with lib;
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let
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installSanePath = path: ''
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if [ -e "${path}/lib/sane" ]; then
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find "${path}/lib/sane" -maxdepth 1 -not -type d | while read backend; do
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symlink "$backend" "$out/lib/sane/$(basename "$backend")"
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done
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fi
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if [ -e "${path}/etc/sane.d" ]; then
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find "${path}/etc/sane.d" -maxdepth 1 -not -type d | while read conf; do
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name="$(basename $conf)"
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if [ "$name" = "dll.conf" ] || [ "$name" = "saned.conf" ] || [ "$name" = "net.conf" ]; then
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cat "$conf" >> "$out/etc/sane.d/$name"
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else
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symlink "$conf" "$out/etc/sane.d/$name"
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fi
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done
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fi
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if [ -e "${path}/etc/sane.d/dll.d" ]; then
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find "${path}/etc/sane.d/dll.d" -maxdepth 1 -not -type d | while read conf; do
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symlink "$conf" "$out/etc/sane.d/dll.d/$(basename $conf)"
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done
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fi
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'';
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disableBackend = backend: ''
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grep -q '${backend}' $out/etc/sane.d/dll.conf || { echo '${backend} is not a default plugin in $SANE_CONFIG_DIR/dll.conf'; exit 1; }
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substituteInPlace $out/etc/sane.d/dll.conf --replace '${backend}' '# ${backend} disabled in nixos config'
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'';
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in
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stdenv.mkDerivation {
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name = "sane-config";
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phases = "installPhase";
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installPhase = ''
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function symlink () {
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local target=$1 linkname=$2
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if [ -e "$linkname" ]; then
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echo "warning: conflict for $linkname. Overriding $(readlink $linkname) with $target."
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fi
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ln -sfn "$target" "$linkname"
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}
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mkdir -p $out/etc/sane.d $out/etc/sane.d/dll.d $out/lib/sane
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''
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+ (concatMapStrings installSanePath paths)
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+ (concatMapStrings disableBackend disabledDefaultBackends);
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}
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