43 lines
1.4 KiB
Nix
43 lines
1.4 KiB
Nix
{ stdenv, fetchurl }:
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let version = "3.19"; in
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stdenv.mkDerivation rec {
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name = "freefall-${version}";
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src = fetchurl {
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sha256 = "0v40b5l6dcviqgl47bxlcbimz7kawmy1c2909axi441jwlgm2hmy";
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url = "mirror://kernel/linux/kernel/v3.x/linux-${version}.tar.xz";
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};
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buildPhase = ''
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cd Documentation/laptops
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# Default time-out is a little low, probably because the AC/lid status
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# functions were never implemented. Because no-one still uses HDDs, right?
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substituteInPlace freefall.c --replace "alarm(2)" "alarm(5)"
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cc -o freefall freefall.c
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'';
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installPhase = ''
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mkdir -p $out/bin
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install freefall $out/bin
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'';
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meta = with stdenv.lib; {
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description = "Free-fall protection for spinning HP/Dell laptop hard drives";
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longDescription = ''
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ATA/ATAPI-7 specifies the IDLE IMMEDIATE command with unload feature.
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Issuing this command should cause the drive to switch to idle mode and
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unload disk heads. This feature is being used in modern laptops in
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conjunction with accelerometers and appropriate software to implement
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a shock protection facility. The idea is to stop all I/O operations on
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the internal hard drive and park its heads on the ramp when critical
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situations are anticipated. This has no effect on SSD devices!
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'';
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license = licenses.gpl2;
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platforms = with platforms; linux;
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maintainers = with maintainers; [ nckx ];
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};
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}
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