Merge pull request #16030 from abbradar/fhs-refactor
Improvements for FHS user chrootenv
This commit is contained in:
Nikolay Amiantov
GitHub
commit
b341de88e9
11 changed files with 99 additions and 308 deletions
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@ -171,42 +171,18 @@ c = lib.makeOverridable f { a = 1; b = 2; }</programlisting>
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<section xml:id="sec-fhs-environments">
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<title>buildFHSChrootEnv/buildFHSUserEnv</title>
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<title>buildFHSUserEnv</title>
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<para>
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<function>buildFHSChrootEnv</function> and
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<function>buildFHSUserEnv</function> provide a way to build and run
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FHS-compatible lightweight sandboxes. They get their own isolated root with
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binded <filename>/nix/store</filename>, so their footprint in terms of disk
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<function>buildFHSUserEnv</function> provides a way to build and run
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FHS-compatible lightweight sandboxes. It creates an isolated root with
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bound <filename>/nix/store</filename>, so its footprint in terms of disk
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space needed is quite small. This allows one to run software which is hard or
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unfeasible to patch for NixOS -- 3rd-party source trees with FHS assumptions,
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games distributed as tarballs, software with integrity checking and/or external
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self-updated binaries.
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</para>
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<para>
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<function>buildFHSChrootEnv</function> allows to create persistent
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environments, which can be constructed, deconstructed and entered by
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multiple users at once. A downside is that it requires
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<literal>root</literal> access for both those who create and destroy and
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those who enter it. It can be useful to create environments for daemons that
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one can enter and observe.
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</para>
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<para>
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<function>buildFHSUserEnv</function> uses Linux namespaces feature to create
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self-updated binaries. It uses Linux namespaces feature to create
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temporary lightweight environments which are destroyed after all child
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processes exit. It does not require root access, and can be useful to create
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sandboxes and wrap applications.
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</para>
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<para>
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Those functions both rely on <function>buildFHSEnv</function>, which creates
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an actual directory structure given a list of necessary packages and extra
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build commands.
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<function>buildFHSChrootEnv</function> and <function>buildFHSUserEnv</function>
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both accept those arguments which are passed to
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<function>buildFHSEnv</function>:
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processes exit, without root user rights requirement. Accepted arguments are:
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</para>
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<variablelist>
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@ -220,14 +196,16 @@ c = lib.makeOverridable f { a = 1; b = 2; }</programlisting>
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<term><literal>targetPkgs</literal></term>
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<listitem><para>Packages to be installed for the main host's architecture
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(i.e. x86_64 on x86_64 installations).</para></listitem>
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(i.e. x86_64 on x86_64 installations). Along with libraries binaries are also
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installed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>multiPkgs</literal></term>
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<listitem><para>Packages to be installed for all architectures supported by
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a host (i.e. i686 and x86_64 on x86_64 installations).</para></listitem>
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a host (i.e. i686 and x86_64 on x86_64 installations). Only libraries are
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installed by default.</para></listitem>
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</varlistentry>
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<varlistentry>
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@ -240,29 +218,33 @@ c = lib.makeOverridable f { a = 1; b = 2; }</programlisting>
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<varlistentry>
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<term><literal>extraBuildCommandsMulti</literal></term>
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<listitem><para>Like <literal>extraBuildCommandsMulti</literal>, but
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<listitem><para>Like <literal>extraBuildCommands</literal>, but
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executed only on multilib architectures.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>extraOutputsToInstall</literal></term>
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<listitem><para>Additional derivation outputs to be linked for both
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target and multi-architecture packages.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>extraInstallCommands</literal></term>
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<listitem><para>Additional commands to be executed for finalizing the
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derivation with runner script.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>runScript</literal></term>
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<listitem><para>A command that would be executed inside the sandbox and
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passed all the command line arguments. It defaults to
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<literal>bash</literal>.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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Additionally, <function>buildFHSUserEnv</function> accepts
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<literal>runScript</literal> parameter, which is a command that would be
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executed inside the sandbox and passed all the command line arguments. It
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default to <literal>bash</literal>.
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</para>
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<para>
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It also uses <literal>CHROOTENV_EXTRA_BINDS</literal> environment variable
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for binding extra directories in the sandbox to outside places. The format of
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the variable is <literal>/mnt=test-mnt:/data</literal>, where
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<literal>/mnt</literal> would be mounted as <literal>/test-mnt</literal>
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and <literal>/data</literal> would be mounted as <literal>/data</literal>.
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<literal>extraBindMounts</literal> array argument to
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<function>buildFHSUserEnv</function> function is prepended to this variable.
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Latter entries take priority if defined several times -- i.e. in case of
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<literal>/data=data1:/data=data2</literal> the actual bind path would be
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<literal>/data2</literal>.
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</para>
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<para>
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One can create a simple environment using a <literal>shell.nix</literal>
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like that:
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@ -1,48 +0,0 @@
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{ stdenv } : { env, extraInstallCommands ? "" } :
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let
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# References to shell scripts that set up or tear down the environment
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initSh = ./init.sh.in;
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mountSh = ./mount.sh.in;
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loadSh = ./load.sh.in;
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umountSh = ./umount.sh.in;
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destroySh = ./destroy.sh.in;
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name = env.pname;
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in stdenv.mkDerivation {
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name = "${name}-chrootenv";
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preferLocalBuild = true;
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buildCommand = ''
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mkdir -p $out/bin
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cd $out/bin
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sed -e "s|@chrootEnv@|${env}|g" \
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-e "s|@name@|${name}|g" \
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-e "s|@shell@|${stdenv.shell}|g" \
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${initSh} > init-${name}-chrootenv
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chmod +x init-${name}-chrootenv
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sed -e "s|@shell@|${stdenv.shell}|g" \
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-e "s|@name@|${name}|g" \
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${mountSh} > mount-${name}-chrootenv
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chmod +x mount-${name}-chrootenv
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sed -e "s|@shell@|${stdenv.shell}|g" \
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-e "s|@name@|${name}|g" \
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${loadSh} > load-${name}-chrootenv
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chmod +x load-${name}-chrootenv
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sed -e "s|@shell@|${stdenv.shell}|g" \
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-e "s|@name@|${name}|g" \
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${umountSh} > umount-${name}-chrootenv
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chmod +x umount-${name}-chrootenv
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sed -e "s|@chrootEnv@|${env}|g" \
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-e "s|@shell@|${stdenv.shell}|g" \
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-e "s|@name@|${name}|g" \
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${destroySh} > destroy-${name}-chrootenv
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chmod +x destroy-${name}-chrootenv
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${extraInstallCommands}
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'';
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}
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@ -1,22 +0,0 @@
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#! @shell@ -e
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chrootenvDest=/run/chrootenv/@name@
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# Remove bind mount points
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rmdir $chrootenvDest/{dev,nix/store,nix,proc,sys,host-etc,home,var,run,tmp}
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# Remove symlinks to the software that should be part of the chroot system profile
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for i in @chrootEnv@/*
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do
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if [ "$i" != "@chrootEnv@/etc" ] && [ "$i" != "@chrootEnv@/var" ]
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then
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rm $chrootenvDest/$(basename $i)
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fi
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done
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# Remove the remaining folders
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rm -Rf $chrootenvDest/{etc,root}
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rm -Rf /tmp/chrootenv-@name@
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# Remove the chroot environment folder
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rmdir $chrootenvDest
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@ -1,22 +0,0 @@
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#! @shell@ -e
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chrootenvDest=/run/chrootenv/@name@
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# Create some mount points for stuff that must be bind mounted
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mkdir -p $chrootenvDest/{nix/store,dev,proc,sys,host-etc,host-tmp,home,var,run}
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# Symlink the software that should be part of the chroot system profile
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for i in @chrootEnv@/*
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do
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if [ "$i" != "@chrootEnv@/var" ]
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then
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ln -s "$i" "$chrootenvDest"
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fi
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done
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# Create root folder
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mkdir $chrootenvDest/root
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# Create tmp folder
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mkdir -m1777 $chrootenvDest/tmp
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mkdir -m1777 -p /tmp/chrootenv-@name@
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@ -1,13 +0,0 @@
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#! @shell@ -e
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chrootenvDest=/run/chrootenv/@name@
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# Enter the LFS chroot environment
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sudo chroot --userspec "$USER:${GROUPS[0]}" --groups "${GROUPS[0]}" $chrootenvDest /usr/bin/env -i \
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TERM="$TERM" \
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DISPLAY="$DISPLAY" \
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HOME="$HOME" \
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XDG_RUNTIME_DIR="$XDG_RUNTIME_DIR" \
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LANG="$LANG" \
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SSL_CERT_FILE="$SSL_CERT_FILE" \
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/bin/bash --login
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@ -1,34 +0,0 @@
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#! @shell@ -e
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chrootenvDest=/run/chrootenv/@name@
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# Bind mount the Nix store
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mount --bind /nix/store $chrootenvDest/nix/store
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# Bind mount some kernel related stuff
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mount --bind /dev $chrootenvDest/dev
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mount --bind /dev/pts $chrootenvDest/dev/pts
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mount --bind /dev/shm $chrootenvDest/dev/shm
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mount --bind /proc $chrootenvDest/proc
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mount --bind /sys $chrootenvDest/sys
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# Bind mount home directories
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mount --bind /home $chrootenvDest/home
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# Bind mount state directories
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mount --bind /var $chrootenvDest/var
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mount --rbind /run $chrootenvDest/run
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# Bind mount the host system's /etc
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mount --bind /etc $chrootenvDest/host-etc
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# Bind mount the host system's /tmp
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mount --bind /tmp $chrootenvDest/host-tmp
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# Bind mount /tmp
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mount --bind /tmp/chrootenv-@name@ $chrootenvDest/tmp
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# Expose sockets in /tmp
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for i in /tmp/.*-unix; do
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ln -s "/host-tmp/$(basename "$i")" "$chrootenvDest/$i"
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done
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@ -1,6 +0,0 @@
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#! @shell@ -e
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chrootenvDest=/run/chrootenv/@name@
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# Unmount all (r)bind mounts
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umount -l $chrootenvDest/{dev/pts,dev/shm,dev,nix/store,proc,sys,host-etc,host-tmp,home,var,tmp,run}
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@ -2,16 +2,15 @@
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# Bind mounts hierarchy: from => to (relative)
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# If 'to' is nil, path will be the same
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mounts = { '/nix/store' => nil,
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'/dev' => nil,
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mounts = { '/' => 'host',
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'/proc' => nil,
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'/sys' => nil,
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'/etc' => 'host-etc',
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'/tmp' => 'host-tmp',
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'/home' => nil,
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'/nix' => nil,
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'/tmp' => nil,
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'/var' => nil,
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'/run' => nil,
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'/root' => nil,
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'/dev' => nil,
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'/home' => nil,
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}
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# Propagate environment variables
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@ -62,12 +61,15 @@ $mount = make_fcall 'mount', [Fiddle::TYPE_VOIDP,
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Fiddle::TYPE_INT
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# Read command line args
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abort "Usage: chrootenv swdir program args..." unless ARGV.length >= 2
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swdir = Pathname.new ARGV[0]
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execp = ARGV.drop 1
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abort "Usage: chrootenv program args..." unless ARGV.length >= 1
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execp = ARGV
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# Populate extra mounts
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if not ENV["CHROOTENV_EXTRA_BINDS"].nil?
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$stderr.puts "CHROOTENV_EXTRA_BINDS is discussed for deprecation."
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$stderr.puts "If you have a usecase, please drop a note in issue #16030."
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$stderr.puts "Notice that we now bind-mount host FS to '/host' and symlink all directories from it to '/' by default."
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for extra in ENV["CHROOTENV_EXTRA_BINDS"].split(':')
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paths = extra.split('=')
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if not paths.empty?
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@ -132,24 +134,6 @@ if $cpid == 0
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Dir.chroot root
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Dir.chdir '/'
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# Symlink swdir hierarchy
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mount_dirs = Set.new mounts.map { |_, v| Pathname.new v }
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link_swdir = lambda do |swdir, prefix|
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swdir.find do |path|
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rel = prefix.join path.relative_path_from(swdir)
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# Don't symlink anything in binded or symlinked directories
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Find.prune if mount_dirs.include? rel or rel.symlink?
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if not rel.directory?
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# File does not exist; make a symlink and bail out
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rel.make_symlink path
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Find.prune
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end
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# Recursively follow symlinks
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link_swdir.call path.readlink, rel if path.symlink?
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end
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end
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link_swdir.call swdir, Pathname.new('')
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# New environment
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new_env = Hash[ envvars.map { |x| [x, ENV[x]] } ]
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@ -1,28 +1,29 @@
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{ runCommand, lib, writeText, writeScriptBin, stdenv, ruby } :
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{ env, runScript ? "bash", extraBindMounts ? [], extraInstallCommands ? "", meta ? {}, passthru ? {} } :
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{ callPackage, runCommand, lib, writeScript, stdenv, coreutils, ruby }:
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let buildFHSEnv = callPackage ./env.nix { }; in
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args@{ name, runScript ? "bash", extraBindMounts ? [], extraInstallCommands ? "", meta ? {}, passthru ? {}, ... }:
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let
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name = env.pname;
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env = buildFHSEnv (removeAttrs args [ "runScript" "extraBindMounts" "extraInstallCommands" "meta" "passthru" ]);
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# Sandboxing script
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chroot-user = writeScriptBin "chroot-user" ''
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chroot-user = writeScript "chroot-user" ''
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#! ${ruby}/bin/ruby
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${builtins.readFile ./chroot-user.rb}
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'';
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init = run: writeText "${name}-init" ''
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source /etc/profile
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# Make /tmp directory
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mkdir -m 1777 /tmp
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# Expose sockets in /tmp
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for i in /host-tmp/.*-unix; do
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ln -s "$i" "/tmp/$(basename "$i")"
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init = run: writeScript "${name}-init" ''
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#! ${stdenv.shell}
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for i in ${env}/* /host/*; do
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path="/''${i##*/}"
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[ -e "$path" ] || ${coreutils}/bin/ln -s "$i" "$path"
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done
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[ -d "$1" ] && [ -r "$1" ] && cd "$1"
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shift
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source /etc/profile
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exec ${run} "$@"
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'';
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@ -32,7 +33,7 @@ in runCommand name {
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env = runCommand "${name}-shell-env" {
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shellHook = ''
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export CHROOTENV_EXTRA_BINDS="${lib.concatStringsSep ":" extraBindMounts}:$CHROOTENV_EXTRA_BINDS"
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exec ${chroot-user}/bin/chroot-user ${env} bash ${init "bash"} "$(pwd)"
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exec ${chroot-user} ${init "bash"} "$(pwd)"
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'';
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} ''
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echo >&2 ""
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@ -46,7 +47,7 @@ in runCommand name {
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cat <<EOF >$out/bin/${name}
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#! ${stdenv.shell}
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export CHROOTENV_EXTRA_BINDS="${lib.concatStringsSep ":" extraBindMounts}:\$CHROOTENV_EXTRA_BINDS"
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exec ${chroot-user}/bin/chroot-user ${env} bash ${init runScript} "\$(pwd)" "\$@"
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exec ${chroot-user} ${init runScript} "\$(pwd)" "\$@"
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EOF
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chmod +x $out/bin/${name}
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${extraInstallCommands}
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|
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@ -1,7 +1,7 @@
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{ nixpkgs, nixpkgs_i686, system
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} :
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{ stdenv, buildEnv, writeText, pkgs, pkgsi686Linux, system }:
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{ name, profile ? ""
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, pkgs ? null, targetPkgs ? pkgs: [], multiPkgs ? pkgs: []
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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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@ -22,37 +22,32 @@
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# /lib will link to /lib32
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let
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isMultiBuild = pkgs == null && multiPkgs != null && system == "x86_64-linux";
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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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# support deprecated "pkgs" option.
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targetPkgs' =
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if pkgs != null
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then builtins.trace "buildFHSEnv: 'pkgs' option is deprecated, use 'targetPkgs'" (pkgs': pkgs)
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else targetPkgs;
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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' nixpkgs ++ (if multiPkgs == null then [] else multiPkgs nixpkgs);
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targetPaths = targetPkgs pkgs ++ (if multiPkgs == null then [] else multiPkgs pkgs);
|
||||
|
||||
# list of packages which are installed for both x86 and x86_64 on x86_64
|
||||
# systems
|
||||
multiPaths = multiPkgs nixpkgs_i686;
|
||||
multiPaths = multiPkgs pkgsi686Linux;
|
||||
|
||||
# base packages of the chroot
|
||||
# these match the host's architecture, glibc_multi is used for multilib
|
||||
# builds.
|
||||
basePkgs = with nixpkgs;
|
||||
basePkgs = with pkgs;
|
||||
[ (if isMultiBuild then glibc_multi else glibc)
|
||||
gcc.cc.lib bashInteractive coreutils less shadow su
|
||||
(toString gcc.cc.lib) bashInteractive coreutils less shadow su
|
||||
gawk diffutils findutils gnused gnugrep
|
||||
gnutar gzip bzip2 xz glibcLocales
|
||||
];
|
||||
baseMultiPkgs = with nixpkgs_i686;
|
||||
[ gcc.cc.lib
|
||||
baseMultiPkgs = with pkgsi686Linux;
|
||||
[ (toString gcc.cc.lib)
|
||||
];
|
||||
|
||||
etcProfile = nixpkgs.writeText "profile" ''
|
||||
etcProfile = writeText "profile" ''
|
||||
export PS1='${name}-chrootenv:\u@\h:\w\$ '
|
||||
export LOCALE_ARCHIVE='/usr/lib/locale/locale-archive'
|
||||
export LD_LIBRARY_PATH='/run/opengl-driver/lib:/run/opengl-driver-32/lib:/usr/lib:/usr/lib32'
|
||||
|
|
@ -67,7 +62,7 @@ let
|
|||
'';
|
||||
|
||||
# Compose /etc for the chroot environment
|
||||
etcPkg = nixpkgs.stdenv.mkDerivation {
|
||||
etcPkg = stdenv.mkDerivation {
|
||||
name = "${name}-chrootenv-etc";
|
||||
buildCommand = ''
|
||||
mkdir -p $out/etc
|
||||
|
|
@ -77,38 +72,38 @@ let
|
|||
ln -s ${etcProfile} profile
|
||||
|
||||
# compatibility with NixOS
|
||||
ln -s /host-etc/static static
|
||||
ln -s /host/etc/static static
|
||||
|
||||
# symlink some NSS stuff
|
||||
ln -s /host-etc/passwd passwd
|
||||
ln -s /host-etc/group group
|
||||
ln -s /host-etc/shadow shadow
|
||||
ln -s /host-etc/hosts hosts
|
||||
ln -s /host-etc/resolv.conf resolv.conf
|
||||
ln -s /host-etc/nsswitch.conf nsswitch.conf
|
||||
ln -s /host/etc/passwd passwd
|
||||
ln -s /host/etc/group group
|
||||
ln -s /host/etc/shadow shadow
|
||||
ln -s /host/etc/hosts hosts
|
||||
ln -s /host/etc/resolv.conf resolv.conf
|
||||
ln -s /host/etc/nsswitch.conf nsswitch.conf
|
||||
|
||||
# symlink sudo and su stuff
|
||||
ln -s /host-etc/login.defs login.defs
|
||||
ln -s /host-etc/sudoers sudoers
|
||||
ln -s /host-etc/sudoers.d sudoers.d
|
||||
ln -s /host/etc/login.defs login.defs
|
||||
ln -s /host/etc/sudoers sudoers
|
||||
ln -s /host/etc/sudoers.d sudoers.d
|
||||
|
||||
# symlink other core stuff
|
||||
ln -s /host-etc/localtime localtime
|
||||
ln -s /host-etc/machine-id machine-id
|
||||
ln -s /host-etc/os-release os-release
|
||||
ln -s /host/etc/localtime localtime
|
||||
ln -s /host/etc/machine-id machine-id
|
||||
ln -s /host/etc/os-release os-release
|
||||
|
||||
# symlink PAM stuff
|
||||
ln -s /host-etc/pam.d pam.d
|
||||
ln -s /host/etc/pam.d pam.d
|
||||
|
||||
# symlink fonts stuff
|
||||
ln -s /host-etc/fonts fonts
|
||||
ln -s /host/etc/fonts fonts
|
||||
|
||||
# symlink ALSA stuff
|
||||
ln -s /host-etc/asound.conf asound.conf
|
||||
ln -s /host/etc/asound.conf asound.conf
|
||||
|
||||
# symlink SSL certs
|
||||
mkdir -p ssl
|
||||
ln -s /host-etc/ssl/certs ssl/certs
|
||||
ln -s /host/etc/ssl/certs ssl/certs
|
||||
|
||||
# symlink /etc/mtab -> /proc/mounts (compat for old userspace progs)
|
||||
ln -s /proc/mounts mtab
|
||||
|
|
@ -116,26 +111,25 @@ let
|
|||
};
|
||||
|
||||
# Composes a /usr-like directory structure
|
||||
staticUsrProfileTarget = nixpkgs.buildEnv {
|
||||
staticUsrProfileTarget = buildEnv {
|
||||
name = "${name}-usr-target";
|
||||
paths = [ etcPkg ] ++ basePkgs ++ targetPaths;
|
||||
extraOutputsToInstall = [ "lib" "out" ] ++ extraOutputsToInstall;
|
||||
extraOutputsToInstall = [ "out" "lib" "bin" ] ++ extraOutputsToInstall;
|
||||
ignoreCollisions = true;
|
||||
};
|
||||
|
||||
staticUsrProfileMulti = nixpkgs.buildEnv {
|
||||
staticUsrProfileMulti = buildEnv {
|
||||
name = "${name}-usr-multi";
|
||||
paths = baseMultiPkgs ++ multiPaths;
|
||||
extraOutputsToInstall = [ "lib" "out" ] ++ extraOutputsToInstall;
|
||||
extraOutputsToInstall = [ "out" "lib" ] ++ extraOutputsToInstall;
|
||||
ignoreCollisions = true;
|
||||
};
|
||||
|
||||
# setup library paths only for the targeted architecture
|
||||
setupLibDirs_target = ''
|
||||
mkdir -m0755 lib
|
||||
|
||||
# copy content of targetPaths
|
||||
cp -rsHf ${staticUsrProfileTarget}/lib/* lib/
|
||||
# link content of targetPaths
|
||||
cp -rsHf ${staticUsrProfileTarget}/lib lib
|
||||
ln -s lib lib${if is64Bit then "64" else "32"}
|
||||
'';
|
||||
|
||||
# setup /lib, /lib32 and /lib64
|
||||
|
|
@ -184,7 +178,7 @@ let
|
|||
done
|
||||
'';
|
||||
|
||||
in nixpkgs.stdenv.mkDerivation {
|
||||
in stdenv.mkDerivation {
|
||||
name = "${name}-fhs";
|
||||
buildCommand = ''
|
||||
mkdir -p $out
|
||||
|
|
@ -196,7 +190,4 @@ in nixpkgs.stdenv.mkDerivation {
|
|||
${if isMultiBuild then extraBuildCommandsMulti else ""}
|
||||
'';
|
||||
preferLocalBuild = true;
|
||||
passthru = {
|
||||
pname = name;
|
||||
};
|
||||
}
|
||||
|
|
@ -118,29 +118,7 @@ in
|
|||
|
||||
buildEnv = callPackage ../build-support/buildenv { }; # not actually a package
|
||||
|
||||
buildFHSEnv = callPackage ../build-support/build-fhs-chrootenv/env.nix {
|
||||
nixpkgs = pkgs;
|
||||
nixpkgs_i686 = pkgsi686Linux;
|
||||
};
|
||||
|
||||
chrootFHSEnv = callPackage ../build-support/build-fhs-chrootenv { };
|
||||
userFHSEnv = callPackage ../build-support/build-fhs-userenv {
|
||||
ruby = ruby_2_1;
|
||||
};
|
||||
|
||||
buildFHSChrootEnv = args: chrootFHSEnv {
|
||||
env = buildFHSEnv (removeAttrs args [ "extraInstallCommands" ]);
|
||||
extraInstallCommands = args.extraInstallCommands or "";
|
||||
};
|
||||
|
||||
buildFHSUserEnv = args: userFHSEnv {
|
||||
env = buildFHSEnv (removeAttrs args [ "runScript" "extraBindMounts" "extraInstallCommands" "meta" "passthru" ]);
|
||||
runScript = args.runScript or "bash";
|
||||
extraBindMounts = args.extraBindMounts or [];
|
||||
extraInstallCommands = args.extraInstallCommands or "";
|
||||
meta = args.meta or {};
|
||||
passthru = args.passthru or {};
|
||||
};
|
||||
buildFHSUserEnv = callPackage ../build-support/build-fhs-userenv { };
|
||||
|
||||
buildMaven = callPackage ../build-support/build-maven.nix {};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue