nixpkgs/pkgs/build-support/build-fhs-chrootenv/default.nix
2014-09-06 00:25:49 +02:00

220 lines
6.8 KiB
Nix

{ buildEnv, nixpkgs, nixpkgs_i686, system
, stdenv, glibc, glibc_multi, glibcLocales
, bashInteractive, coreutils, less, shadow, su
, gawk, gcc, gcc_multi, diffutils, findutils, gnused, gnugrep
, gnutar, gzip, bzip2, xz
} :
{ name, pkgs ? [], profile ? ""
, targetPkgs ? null, multiPkgs ? null
, extraBuildCommands ? "", extraBuildCommandsMulti ? ""
}:
assert pkgs != [] -> targetPkgs == null && multiPkgs == null;
assert targetPkgs != null -> multiPkgs != null;
assert multiPkgs != null -> targetPkgs != null;
assert targetPkgs != null -> pkgs == [];
# HOWTO:
# If pkgs is defined buildFHSChrootEnv will run in legacy mode. This means
# it will build all pkgs contained in pkgs and basePkgs and then just merge
# all of their contents together via buildEnv.
#
# The new way is to define both targetPkgs and multiPkgs. These two are
# functions which get a pkgs environment supplied and should then return a list
# of packages based this environment.
# For example: targetPkgs = pkgs: [ pkgs.nmap ];
#
# All packages (most likeley programs) placed in targetPkgs will only be
# installed once--matching the hosts architecture (64bit on x86_64 and 32bit on
# x86). These packages will populate the chroot directory tree.
#
# Packages (most likeley libraries) defined in multiPkgs will be installed once
# on x86 systems and twice on x86_64 systems.
# On x86 they will just be merge with the packages defined in targetPkgs.
# On x86_64 they will be added to targetPkgs and in addition their 32bit
# versions will also be installed. The final directory should look as follows:
# /lib will include 32bit libraries from multiPkgs
# /lib32 will link to /lib
# /lib64 will include 64bit libraries from multiPkgs and targetPkgs
# /x86 will contain a complete 32bit environment composed by multiPkgs
let
is64Bit = system == "x86_64-linux";
# enable multi builds on x86_64 hosts if pakgs_target/multi are defined
isMultiBuild = is64Bit && targetPkgs != null;
isTargetBuild = !isMultiBuild;
# list of packages (usually programs) which will only be installed for the
# hosts architecture
targetPaths = if targetPkgs == null
then pkgs
else targetPkgs nixpkgs ++ multiPkgs nixpkgs;
# list of pckages which should be build for both x86 and x86_64 on x86_64
# systems
multiPaths = if isMultiBuild
then multiPkgs nixpkgs_i686
else [];
# base packages of the chroot
# these match the hosts architecture, gcc/glibc_multi will be choosen
# on multi builds
choosenGcc = if isMultiBuild then gcc_multi else gcc;
basePkgs =
[ (if isMultiBuild then glibc_multi else glibc)
choosenGcc
bashInteractive coreutils less shadow su
gawk diffutils findutils gnused gnugrep
gnutar gzip bzip2 xz
];
# Compose a global profile for the chroot environment
profilePkg = nixpkgs.stdenv.mkDerivation {
name = "${name}-chrootenv-profile";
buildCommand = ''
mkdir -p $out/etc
cat >> $out/etc/profile << "EOF"
export PS1='${name}-chrootenv:\u@\h:\w\$ '
${profile}
EOF
'';
};
# Composes a /usr like directory structure
staticUsrProfileTarget = buildEnv {
name = "system-profile-target";
paths = basePkgs ++ [ profilePkg ] ++ targetPaths;
};
staticUsrProfileMulti = buildEnv {
name = "system-profile-multi";
paths = multiPaths;
};
# References to shell scripts that set up or tear down the environment
initSh = ./init.sh.in;
mountSh = ./mount.sh.in;
loadSh = ./load.sh.in;
umountSh = ./umount.sh.in;
destroySh = ./destroy.sh.in;
linkProfile = profile: ''
for i in ${profile}/{etc,bin,sbin,share,var}; do
if [ -x "$i" ]
then
ln -s "$i"
fi
done
'';
# the target profile is the actual profile that will be used for the chroot
setupTargetProfile = ''
${linkProfile staticUsrProfileTarget}
${setupLibDirs}
mkdir -m0755 usr
cd usr
${linkProfile staticUsrProfileTarget}
${setupLibDirs}
cd ..
'';
# this will happen on x86_64 host:
# /x86 -> links to the whole profile defined by multiPaths
# /lib, /lib32 -> links to 32bit binaries
# /lib64 -> links to 64bit binaries
# /usr/lib* -> same as above
setupMultiProfile = if isTargetBuild then "" else ''
mkdir -m0755 x86
cd x86
${linkProfile staticUsrProfileMulti}
cd ..
'';
setupLibDirs = if isTargetBuild then setupLibDirs_target
else setupLibDirs_multi;
# setup library paths only for the targeted architecture
setupLibDirs_target = ''
mkdir -m0755 lib
# copy content of targetPaths
cp -rsf ${staticUsrProfileTarget}/lib/* lib/
'';
# setup /lib, /lib32 and /lib64
setupLibDirs_multi = ''
mkdir -m0755 lib
mkdir -m0755 lib64
ln -s lib lib32
# copy glibc stuff
cp -rsf ${staticUsrProfileTarget}/lib/32/* lib/
# copy content of multiPaths (32bit libs)
cp -rsf ${staticUsrProfileMulti}/lib/* lib/
# copy content of targetPaths (64bit libs)
cp -rsf ${staticUsrProfileTarget}/lib/* lib64/
# most 64bit only libs put their stuff into /lib
# some pkgs (like gcc_multi) put 32bit libs into and /lib 64bit libs into /lib64
# by overwriting these we will hopefully catch all these cases
# in the end /lib should only contain 32bit and /lib64 only 64bit libs
cp -rsf ${staticUsrProfileTarget}/lib64/* lib64/
# copy gcc libs (and may overwrite exitsting wrongly placed libs)
cp -rsf ${choosenGcc.gcc}/lib/* lib/
cp -rsf ${choosenGcc.gcc}/lib64/* lib64/
'';
in stdenv.mkDerivation {
name = "${name}-chrootenv";
buildCommand = ''
mkdir -p "$out/sw"
cd "$out/sw"
${setupTargetProfile}
${setupMultiProfile}
cd ..
mkdir -p bin
cd bin
sed -e "s|@chrootEnv@|$out|g" \
-e "s|@name@|${name}|g" \
-e "s|@shell@|${stdenv.shell}|g" \
${initSh} > init-${name}-chrootenv
chmod +x init-${name}-chrootenv
sed -e "s|@shell@|${stdenv.shell}|g" \
-e "s|@name@|${name}|g" \
${mountSh} > mount-${name}-chrootenv
chmod +x mount-${name}-chrootenv
sed -e "s|@shell@|${stdenv.shell}|g" \
-e "s|@name@|${name}|g" \
${loadSh} > load-${name}-chrootenv
chmod +x load-${name}-chrootenv
sed -e "s|@shell@|${stdenv.shell}|g" \
-e "s|@name@|${name}|g" \
${umountSh} > umount-${name}-chrootenv
chmod +x umount-${name}-chrootenv
sed -e "s|@chrootEnv@|$out|g" \
-e "s|@shell@|${stdenv.shell}|g" \
-e "s|@name@|${name}|g" \
${destroySh} > destroy-${name}-chrootenv
chmod +x destroy-${name}-chrootenv
cd ..
cd "$out/sw"
${extraBuildCommands}
cd "$out/sw"
${if isMultiBuild then extraBuildCommandsMulti else ""}
cd ..
'';
}