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manual-config: Always add config query functions

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If the config attrset is manually specified, we still want isYes,
isModule, etc. to work. But we let the passed in config attrset take
precedence, if for some reason the caller wants to provide their own
implementation of one or more of these functions.

Signed-off-by: Shea Levy <shea@shealevy.com>
This commit is contained in:
Shea Levy 2013-12-31 22:46:43 -05:00
parent 008992619f
commit fe185f0a18
1 changed files with 32 additions and 40 deletions
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72
pkgs/os-specific/linux/kernel/manual-config.nix
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@ -1,45 +1,16 @@
{ stdenv, runCommand, nettools, bc, perl, kmod, writeTextFile, ubootChooser }:
let
inherit (stdenv.lib)
hasAttr getAttr optionalAttrs optional optionalString maintainers platforms;
# Function to parse the config file into a nix expression
readConfig = configFile:
let
configAttrs = import "${runCommand "config.nix" {} ''
echo "{" > "$out"
while IFS='=' read key val; do
[ "x''${key#CONFIG_}" != "x$key" ] || continue
no_firstquote="''${val#\"}";
echo ' "'"$key"'" = "'"''${no_firstquote%\"}"'";' >> "$out"
done < "${configFile}"
echo "}" >> $out
''}";
config = configAttrs // rec {
attrName = attr: "CONFIG_" + attr;
isSet = attr: hasAttr (attrName attr) config;
getValue = attr: if isSet attr then getAttr (attrName attr) config else null;
isYes = attr: (isSet attr) && ((getValue attr) == "y");
isNo = attr: (isSet attr) && ((getValue attr) == "n");
isModule = attr: (isSet attr) && ((getValue attr) == "m");
isEnabled = attr: (isModule attr) || (isYes attr);
isDisabled = attr: (!(isSet attr)) || (isNo attr);
};
in
config;
in
{
readConfig = configfile: import (runCommand "config.nix" {} ''
echo "{" > "$out"
while IFS='=' read key val; do
[ "x''${key#CONFIG_}" != "x$key" ] || continue
no_firstquote="''${val#\"}";
echo ' "'"$key"'" = "'"''${no_firstquote%\"}"'";' >> "$out"
done < "${configfile}"
echo "}" >> $out
'').outPath;
in {
# The kernel version
version,
# The version of the kernel module directory
@ -52,12 +23,33 @@ in
configfile,
# Manually specified nixexpr representing the config
# If unspecified, this will be autodetected from the .config
config ? optionalAttrs allowImportFromDerivation (readConfig configfile),
config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
# Whether to utilize the controversial import-from-derivation feature to parse the config
allowImportFromDerivation ? false
}:
let config_ = config; in
let
inherit (stdenv.lib)
hasAttr getAttr optionalAttrs optional optionalString maintainers platforms;
config = let attrName = attr: "CONFIG_" + attr; in {
isSet = attr: hasAttr (attrName attr) config;
getValue = attr: if config.isSet attr then getAttr (attrName attr) config else null;
isYes = attr: (config.getValue attr) == "y";
isNo = attr: (config.getValue attr) == "n";
isModule = attr: (config.getValue attr) == "m";
isEnabled = attr: (config.isModule attr) || (config.isYes attr);
isDisabled = attr: (!(config.isSet attr)) || (config.isNo attr);
} // config_;
installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
#!${stdenv.shell} -e
mkdir -p $4