199 lines
6 KiB
Nix
199 lines
6 KiB
Nix
{ stdenv, buildEnv, writeText, pkgs, pkgsi686Linux, system }:
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{ name, profile ? ""
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, targetPkgs ? pkgs: [], multiPkgs ? pkgs: []
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, extraBuildCommands ? "", extraBuildCommandsMulti ? ""
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, extraOutputsToInstall ? []
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}:
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# HOWTO:
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# All packages (most likely programs) returned from targetPkgs will only be
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# installed once--matching the host's architecture (64bit on x86_64 and 32bit on
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# x86).
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#
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# Packages (most likely libraries) returned from multiPkgs are installed
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# once on x86 systems and twice on x86_64 systems.
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# On x86 they are merged with packages from targetPkgs.
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# On x86_64 they are added to targetPkgs and in addition their 32bit
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# versions are also installed. The final directory structure looks as
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# follows:
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# /lib32 will include 32bit libraries from multiPkgs
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# /lib64 will include 64bit libraries from multiPkgs and targetPkgs
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# /lib will link to /lib32
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let
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is64Bit = system == "x86_64-linux";
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isMultiBuild = multiPkgs != null && is64Bit;
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isTargetBuild = !isMultiBuild;
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# list of packages (usually programs) which are only be installed for the
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# host's architecture
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targetPaths = targetPkgs pkgs ++ (if multiPkgs == null then [] else multiPkgs pkgs);
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# list of packages which are installed for both x86 and x86_64 on x86_64
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# systems
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multiPaths = multiPkgs pkgsi686Linux;
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# base packages of the chroot
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# these match the host's architecture, glibc_multi is used for multilib
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# builds.
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basePkgs = with pkgs;
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[ (if isMultiBuild then glibc_multi else glibc)
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(toString gcc.cc.lib) bashInteractive coreutils less shadow su
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gawk diffutils findutils gnused gnugrep
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gnutar gzip bzip2 xz glibcLocales
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];
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baseMultiPkgs = with pkgsi686Linux;
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[ (toString gcc.cc.lib)
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];
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etcProfile = writeText "profile" ''
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export PS1='${name}-chrootenv:\u@\h:\w\$ '
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export LOCALE_ARCHIVE='/usr/lib/locale/locale-archive'
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export LD_LIBRARY_PATH='/run/opengl-driver/lib:/run/opengl-driver-32/lib:/usr/lib:/usr/lib32'
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export PATH='/run/wrappers/bin:/usr/bin:/usr/sbin'
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export TZDIR='/etc/zoneinfo'
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# Force compilers and other tools to look in default search paths
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unset NIX_ENFORCE_PURITY
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export NIX_CC_WRAPPER_${stdenv.cc.infixSalt}_TARGET_HOST=1
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export NIX_CFLAGS_COMPILE='-idirafter /usr/include'
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export NIX_CFLAGS_LINK='-L/usr/lib -L/usr/lib32'
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export NIX_LDFLAGS='-L/usr/lib -L/usr/lib32'
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export PKG_CONFIG_PATH=/usr/lib/pkgconfig
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export ACLOCAL_PATH=/usr/share/aclocal
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${profile}
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'';
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# Compose /etc for the chroot environment
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etcPkg = stdenv.mkDerivation {
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name = "${name}-chrootenv-etc";
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buildCommand = ''
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mkdir -p $out/etc
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cd $out/etc
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# environment variables
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ln -s ${etcProfile} profile
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# compatibility with NixOS
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ln -s /host/etc/static static
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# symlink some NSS stuff
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ln -s /host/etc/passwd passwd
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ln -s /host/etc/group group
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ln -s /host/etc/shadow shadow
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ln -s /host/etc/hosts hosts
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ln -s /host/etc/resolv.conf resolv.conf
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ln -s /host/etc/nsswitch.conf nsswitch.conf
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# symlink sudo and su stuff
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ln -s /host/etc/login.defs login.defs
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ln -s /host/etc/sudoers sudoers
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ln -s /host/etc/sudoers.d sudoers.d
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# symlink other core stuff
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ln -s /host/etc/localtime localtime
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ln -s /host/etc/zoneinfo zoneinfo
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ln -s /host/etc/machine-id machine-id
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ln -s /host/etc/os-release os-release
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# symlink PAM stuff
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ln -s /host/etc/pam.d pam.d
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# symlink fonts stuff
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ln -s /host/etc/fonts fonts
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# symlink ALSA stuff
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ln -s /host/etc/asound.conf asound.conf
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# symlink SSL certs
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mkdir -p ssl
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ln -s /host/etc/ssl/certs ssl/certs
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# symlink /etc/mtab -> /proc/mounts (compat for old userspace progs)
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ln -s /proc/mounts mtab
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'';
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};
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# Composes a /usr-like directory structure
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staticUsrProfileTarget = buildEnv {
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name = "${name}-usr-target";
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paths = [ etcPkg ] ++ basePkgs ++ targetPaths;
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extraOutputsToInstall = [ "out" "lib" "bin" ] ++ extraOutputsToInstall;
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ignoreCollisions = true;
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};
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staticUsrProfileMulti = buildEnv {
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name = "${name}-usr-multi";
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paths = baseMultiPkgs ++ multiPaths;
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extraOutputsToInstall = [ "out" "lib" ] ++ extraOutputsToInstall;
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ignoreCollisions = true;
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};
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# setup library paths only for the targeted architecture
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setupLibDirs_target = ''
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# link content of targetPaths
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cp -rsHf ${staticUsrProfileTarget}/lib lib
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ln -s lib lib${if is64Bit then "64" else "32"}
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'';
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# setup /lib, /lib32 and /lib64
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setupLibDirs_multi = ''
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mkdir -m0755 lib32
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mkdir -m0755 lib64
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ln -s lib64 lib
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# copy glibc stuff
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cp -rsHf ${staticUsrProfileTarget}/lib/32/* lib32/ && chmod u+w -R lib32/
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# copy content of multiPaths (32bit libs)
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[ -d ${staticUsrProfileMulti}/lib ] && cp -rsHf ${staticUsrProfileMulti}/lib/* lib32/ && chmod u+w -R lib32/
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# copy content of targetPaths (64bit libs)
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cp -rsHf ${staticUsrProfileTarget}/lib/* lib64/ && chmod u+w -R lib64/
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# symlink 32-bit ld-linux.so
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ln -Ls ${staticUsrProfileTarget}/lib/32/ld-linux.so.2 lib/
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'';
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setupLibDirs = if isTargetBuild then setupLibDirs_target
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else setupLibDirs_multi;
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# the target profile is the actual profile that will be used for the chroot
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setupTargetProfile = ''
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mkdir -m0755 usr
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cd usr
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${setupLibDirs}
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for i in bin sbin share include; do
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if [ -d "${staticUsrProfileTarget}/$i" ]; then
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cp -rsHf "${staticUsrProfileTarget}/$i" "$i"
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fi
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done
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cd ..
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for i in var etc; do
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if [ -d "${staticUsrProfileTarget}/$i" ]; then
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cp -rsHf "${staticUsrProfileTarget}/$i" "$i"
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fi
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done
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for i in usr/{bin,sbin,lib,lib32,lib64}; do
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if [ -d "$i" ]; then
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ln -s "$i"
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fi
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done
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'';
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in stdenv.mkDerivation {
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name = "${name}-fhs";
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buildCommand = ''
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mkdir -p $out
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cd $out
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${setupTargetProfile}
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cd $out
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${extraBuildCommands}
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cd $out
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${if isMultiBuild then extraBuildCommandsMulti else ""}
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'';
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preferLocalBuild = true;
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}
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