> N.B. If you're interested in building Midipix using this script, please join

the project's IRC channel #midipix on Libera and ask for the address of the

internal repositories required in order to build Midipix.

> N.B. Due to the present state of the (largely) automated package upstream

updates integration script and, despite frequent contributions, lack of

human resources, it bears mentioning that the 3rd party packages built

and distributed by this script are often not up to date with their resp.

upstream and *may* hence be **insecure**. It is advised that this be taken

into account when deploying and using Midipix distributions.

[//]: # "{{{ Table of contents"

# Table of Contents

1. [What is Midipix, and how is it different?](#1-what-is-midipix-and-how-is-it-different)  

2. [Building and deployment](#2-building-and-deployment)  

	2.1. [Building, installing, and using a Midipix distribution](#21-building-installing-and-using-a-midipix-distribution)  

		2.1.1. [Build-time dependencies](#211-build-time-dependencies)  

			2.1.1.1. [Alpine-specific notate bene](#2111-alpine-specific-notate-bene)  

	2.2. [Deployment](#22-deployment)  

	2.3. [System requirements](#23-system-requirements)  

	2.4. [Troubleshooting](#24-troubleshooting)  

3. [Common concepts and tasks / FAQ](#3-common-concepts-and-tasks-faq)  

	3.1. [Common tasks](#31-common-tasks)  

	3.2. [Adding a package](#32-adding-a-package)  

	3.3. [Addressing build failure](#33-addressing-build-failure)  

	3.4. [Package archive files and Git repositories](#34-package-archive-files-and-git-repositories)  

	3.5. [Patches and ``vars`` files](#35-patches-and-vars-files)  

4. [Reference](#4-reference)  

	4.1. [Build steps](#41-build-steps)  

	4.2. [Build variables](#42-build-variables)  

	4.3. [File installation DSL](#43-file-installation-dsl)  

	4.4. [Package variables](#44-package-variables)  

		4.4.1. [Package variable types](#441-package-variable-types)  

		4.4.2. [Package variables](#442-package-variables)  

	4.5. [Fault-tolerant & highly optimised 3D laser show-equipped usage screen](#45-fault-tolerant--highly-optimised-3d-laser-show-equipped-usage-screen)  

	4.6. [``pkgtool.sh``](#46-pkgtoolsh)  

	4.7. [Bourne shell coding rules](#47-bourne-shell-coding-rules)  

5. [References](#5-references)  

[//]: "}}}"

[//]: # "{{{ 1. What is Midipix, and how is it different?"

## 1. What is Midipix, and how is it different?

midipix is a development environment that lets you create programs

for Windows using the standard C and POSIX APIs. No compromises made,

no shortcuts taken.  

If you are interested in cross-platform programming that reclaims

the notion of write once, compile everywhere; if you believe that the

'standard' in the C Standard Library should not be a null signifier;

and if you like cooking your code without #ifdef hell and low-level

minutiae, then this page is for you.  

midipix makes cross-platform programming better, simpler and faster,

specifically by bringing a modern, conforming C Runtime Library to the

Windows platform. While the idea itself is not new, the approach taken

in midipix to code portability is radically different from that found

in other projects.  

*(reproduced from [[2](https://midipix.org/#sec-midipix)])*

[Back to top](#table-of-contents)

[//]: "}}}"

[//]: # "{{{ 2. Building and deployment"

## 2. Building and deployment

[//]: # "}}}"

[//]: # "{{{ 2.1. Building, installing, and using a Midipix distribution"

### 2.1. Building, installing and using a Midipix distribution

A Midipix distribution consists of the following:

* the native Midipix toolchain, consisting of perk, gcc, its dependencies,

  and binutils,

* musl, a lightweight, fast, simple, and free libc[[1](https://www.musl-libc.org/faq.html)] used by Midipix,

* the Midipix runtime components that bridge the gap between the libc and the

  executive subsystems of all Windows NT-derived Windows OS starting with and

  including Windows XP, and

* a steadily increasing number of 3rd party open source packages, as expected in

  any modern POSIX-compliant \*nix environment, including GNU coreutils, shells,

  libraries such as ncurses, libressl, as well as Perl and Python.

Install the build-time dependencies listed in section [2.1.1](#211-build-time-dependencies),

clone this repository (e.g. ``git clone https://dev.midipix.org/build/midipix_build``)

and run the following command line:

```shell

./build.sh -a nt64 -b release -D zipdist -P -v

```

By default, the build will take place within ``${HOME}/midipix/nt64/release``

and package archive files and/or Git repositores will be downloaded into

``${HOME}/midipix/dlcache``. Consult sections [4.2](#42-build-variables) and

[4.4](#44-package-variables) for the list of available build/package variables

and how to override them.  

Parallelisation is enabled by the above command line for both packages that can

be built independently of each other and ``make(1)`` via ``-j``, limited to the

amount of logical processors on the build host divided by two (2).

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 2.1.1. Build-time dependencies"

### 2.1.1. Build-time dependencies

* **Alpine Linux**:

  binutils bison bzip2 cmake coreutils curl findutils g++ gawk gcc git grep gzip libc-dev linux-headers lzip m4 make musl-dev net-tools patch perl perl-xml-parser procps sed tar util-linux util-linux-dev wget xz zip

* **Arch Linux**:

  binutils bison bzip2 cmake coreutils curl findutils gawk gcc git grep gzip lzip m4 make net-tools patch perl perl-xml-parser procps-ng sed tar util-linux util-linux-libs wget xz zip

* **Debian/-derived Linux**:

  binutils bison bzip2 cmake coreutils curl findutils g++ gawk gcc git grep gzip hostname libc6-dev libxml-parser-perl lzip m4 make patch perl procps sed tar util-linux uuid-dev wget xz-utils zip

* **Gentoo Linux**:

  binutils bison bzip2 cmake coreutils curl findutils gawk =gcc-7.5.0-r1 dev-vcs/git grep gzip lzip m4 make patch perl dev-perl/XML-Parser procps sed tar util-linux libuuid wget xz-utils zip

* **OpenSUSE Linux**:

  binutils bison bzip2 cmake coreutils curl findutils gawk gcc gcc-c++ git grep gzip hostname linux-glibc-devel lzip m4 make patch perl perl-XML-Parser procps sed tar util-linux libuuid1 wget xz zip

#### The distro matrix:

|  Alpine Linux:  |    Arch Linux:     |   Debian/-derived Linux:   |    Gentoo Linux:    |  OpenSUSE Linux:  |

| --------------- | ------------------ | -------------------------- | ------------------- | ----------------- |

| binutils        | binutils           | binutils                   | binutils            | binutils          |

| bison           | bison              | bison                      | bison               | bison             |

| bzip2           | bzip2              | bzip2                      | bzip2               | bzip2             |

| cmake           | cmake              | cmake                      | cmake               | cmake             |

| coreutils       | coreutils          | coreutils                  | coreutils           | coreutils         |

| curl            | curl               | curl                       | curl                | curl              |

| findutils       | findutils          | findutils                  | findutils           | findutils         |

| g++             | -                  | g++                        | -                   | gcc-c++           |

| gawk            | gawk               | gawk                       | gawk                | gawk              |

| gcc             | gcc                | gcc                        | =gcc-7.5.0-r1       | gcc               |

| git             | git                | git                        | dev-vcs/git         | git               |

| grep            | grep               | grep                       | grep                | grep              |

| gzip            | gzip               | gzip                       | gzip                | gzip              |

| -               | -                  | hostname                   | -                   | hostname          |

| libc-dev        | -                  | libc6-dev                  | -                   | linux-glibc-devel |

| linux-headers   | -                  | -                          | -                   | -                 |

| lzip            | lzip               | lzip                       | lzip                | lzip              |

| m4              | m4                 | m4                         | m4                  | m4                |

| make            | make               | make                       | make                | make              |

| musl-dev        | -                  | -                          | -                   | -                 |

| net-tools       | net-tools          | -                          | -                   | -                 |

| patch           | patch              | patch                      | patch               | patch             |

| perl            | perl               | perl                       | perl                | perl              |

| perl-xml-parser | perl-xml-parser    | libxml-parser-perl         | dev-perl/XML-Parser | perl-XML-Parser   |

| procps          | procps-ng          | procps                     | procps              | procps            |

| sed             | sed                | sed                        | sed                 | sed               |

| tar             | tar                | tar                        | tar                 | tar               |

| util-linux      | util-linux         | util-linux                 | util-linux          | util-linux        |

| util-linux-dev  | util-linux-libs    | uuid-dev                   | libuuid             | libuuid1          |

| -               | vi                 | -                          | -                   | -                 |

| wget            | wget               | wget                       | wget                | wget              |

| xz              | xz                 | xz-utils                   | xz-utils            | xz                |

| zip             | zip                | zip                        | zip                 | zip               |

> N.B. Busybox is not supported. Awk implementations other than GNU Awk are not supported.  

> N.B. clang is not supported.  

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 2.1.1.1. Alpine-specific notate bene"

#### 2.1.1.1. Alpine-specific notate bene

Some packages (*coreutils*, *grep*, and *tar*, among others) override Alpine's

BusyBox utilities of the same name, as the latter are either non-conformant or

defective.

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 2.2. Deployment"

### 2.2. Deployment

On successful completion of the build, a ZIP archive containing the Midipix

distribution will be created inside ``${PREFIX}`` (see section [4.2](#42-build-variables).)

Create a directory on the target machine and extract the contents of the distribution

ZIP archive into it, run ``bash.bat``, and then ``/install.sh`` inside the resulting

self-contained Midipix installation shell window.  

Make sure to consult the notate bene below:  

> N.B. The pathname of the target directory containing ``bash.bat`` and all other

distribution files must not contain whitespaces.  

> N.B. The Midipix installer defaults to ``/dev/fs/c/midipix (C:\midipix)``. If left

unchanged, the distribution ZIP archive must not be extracted into a directory of the

same pathname.  

> N.B. The user installing and using Midipix must have been delegated the ``SeCreateSymbolicLinkPrivilege``

("Create symbolic links") privilege[[3](https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/user-rights-assignment)] and additionally be a non-administrator account

owing to the UAC-related filtering policy of tokens introduced by Windows Vista[[4](https://docs.microsoft.com/en-us/previous-versions/dotnet/articles/bb530410%28v%3dmsdn%2e10%29)].  

> N.B. On Windows 10 and 11, Windows Defender as well as SmartScreen must be disabled.

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 2.3. System requirements"

### 2.3. System requirements

The following build-time system requirements are assessed on build hosts

equipped with the following hardware at minimum:

* Intel(R) Xeon(R) CPU W3520 @ 2.67GHz (8 cores)

* 7200 RPM SATA 3.1 HDD

* 6 GB RAM

| Target architecture | Build kind | Distribution kinds selected | Average build time | Disk space required | Peak RAM usage |

| ------------------- | ---------- | --------------------------- | ------------------ | ------------------- | -------------- |

| nt64                | debug      | (none)                      | 2 hours            | 57.62 GB            | 3.55 GB        |

| nt64                | release    | (none)                      | 1 hours 45 minutes | 36.51 GB            | 3.21 GB        |

Package archive files and/or Git repositories additionally consume at least

1.82 GB.

*(last update: Thu, 05 Mar 2020 09:25:41 +0000)*

These are the Midipix distribution disk space system requirements:

| Target architecture | Build kind | Distribution | Installation directory | Archive file |

| ------------------- | ---------- | ------------ | ---------------------- | ------------ |

| nt64                | debug      | 7.3 GB       |  2.3 GB                | 2.1 GB       |

| nt64                | release    | 3.2 GB       |  913 MB                | 830 MB       |

The installation directory and archive file may be safely deleted post-installation.

*(last update: Thu, 07 Jan 2021 18:20:06 +0000)*

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 2.4. Troubleshooting"

### 2.4. Troubleshooting

Midipix presently provides, inter alia, strace-like functionality via

ntctty's logging capabilities. This is available both through the regular

``strace(1)`` command as distributed, which however **must** be provided

with an absolute pathname without consideration for ``${PATH}``, as well

as directly via ``ntctty.exe`` for a session by running ``ntctty.exe``

with the ``--log-level 7`` option, e.g.:

```shell

$ #strace ls -la /        # (incorrect, relative pathname)

$ strace /bin/ls -la /    # (correct, absolute pathname)

$ ntctty.exe --log-level 7 -e /bin/ls -la /

$ ntctty.exe --log-level=7 -e /bin/ls -la /

$ ntctty.exe --log-level 7 -e /bin/sh -c "ls -la /"

$ ntctty.exe --log-level=7 -e /bin/sh -c "ls -la /"

```

By default, ``ntctty.exe`` log files are written into the /var/log/ntctty

directory; this may be adjusted with the ``--log-dir`` and/or

``--log-file`` options. ``strace(1)`` logs to stderr by default.

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 3. Common concepts and tasks"

## 3. Common concepts and tasks

[//]: # "}}}"

[//]: # "{{{ 3.1. Common tasks"

### 3.1. Common tasks

Rebuild set of packages in isolation:

```shell

./build.sh [ ... ] -r mc,zsh

```

Restart the ``@install`` (shorthand alias) step, with implicit ``finish``, of the

``mc`` and ``zsh`` packages.

```shell

./build.sh [ ... ] -r mc,zsh:@install

```

Rebuild set of packages along w/ their dependencies, if any, as needed, or forcibly,

respectively:

```shell

./build.sh [ ... ] -r \*mc,zsh

./build.sh [ ... ] -r \*\*mc,zsh

```

Forcibly rebuild all reverse dependencies of a set of packages:

```shell

./build.sh [ ... ] -r \*\*\*glib,libflac

```

Restart the ``@configure``, ``@build``, and ``@install`` (shorthand alias) steps of the

``coreutils`` package:

```shell

./build.sh -r coreutils:@configure,@build,@install

```

Rebuild entire build groups including or excluding group dependencies, respectively:

```shell

./build.sh [ ... ] -r ALL native_runtime

./build.sh [ ... ] -r ALL =native_runtime

```

Forcibly (re)download all archive files and/or Git repositories associated with all packages:

```shell

./build.sh [ ... ] -r ALL:@fetch,finish

```

> N.B. the "finish" (pseudo-)build step must be included here and in similar use cases so that all

affected packages are marked as having finished building in order to correctly satisfy package-package

dependencies.

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 3.2. Adding a package"

## 3.2. Adding a package

Packages are grouped into *build groups* according to sets of common package

variable defaults, such as ``${PKG_CFLAGS_CONFIGURE}, ${PKG_LDFLAGS_CONFIGURE}``

and ``${PKG_CONFIGURE_ARGS}``, and semantic interrelatedness, such as the

``native_runtime`` build group comprising the Midipix runtime components.

Packages may belong to more than one build group such as when subsumed by a shorthand

build group e.g. the ``dev_packages`` build group, as long as the default set of build

groups or as overriden on the command line does not entail group membership conflicts.  

Build groups files beneath ``groups.d/`` named ``[0-9][0-9][0-9].<group name>.group``

contain package variable defaults, optionally the alphabetically sorted list of contained

packages, if any, in ``<upper case group name>_PACKAGES``, and their package variables

sorted alphabetically with the exception of ``${PKG_DEPENDS}`` (if present,)

``${PKG_SHA256SUM}``, ``${PKG_URL}``, and ``${PKG_VERSION}``, and/or ``${PKG_URLS_GIT}``,

which are specified in this order. Build group files require the following epilogue, the

parameters enclosed in square brackets being optional:

```shell

ex_pkg_register_group "<group name>" "${RTL_FILEOP_SOURCE_FNAME}" [["owner|copy"] ["auto|noauto"]];

# vim:filetype=sh textwidth=0

```

If ``copy`` is specified, the build group will copy all of its packages from their respective

build groups without taking ownership thereof, if ``owner`` is specified, the default, the build

group owns all of its packages. If ``noauto`` is specified, the build group will not be added to

the list of build groups to build by default, if ``auto`` is specified, the build group will be

added to the list of build groups to build by default.  

Additionally, single package files may be added beneath ``groups.d/[0-9][0-9][0-9].<group name>.d/``,

named ``<package name>.package`` containing the package's variables, with the following epilogue,

the parameters enclosed in square brackets being optional:

```shell

ex_pkg_register "<package_name>" "${RTL_FILEOP_SOURCE_FNAME}" ["<group name>"];

# vim:filetype=sh textwidth=0

```

1. Pick a build group according to the criteria mentioned and specifiy the set of package

variables required (see above and section [4.4](#44-package-variables)) in either the

corresponding group file or a single package file; in the former case, do also add the

package to the build group's list of contained packages.

2. Consult section [3.5](#35-patches-and-vars-files) if the package to be added

requires patches or additional code amending or replacing package build steps

or the entire package build. Consult section [4.1](#41-build-steps) for a list

of package build steps and how they are overriden.

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 3.3. Addressing build failure"

## 3.3. Addressing build failure

During package build, standard error and output are redirected into a log file beneath

``${BUILD_WORKDIR}`` named ``${PKG_NAME}_stderrout.log``, following a package variable

dump. If ``-V build`` was specified, package logs will additionally be printed to standard

output. If ``-V xtrace`` was specified, ``xtrace`` will be set during package builds for

rudimentary debugging purposes. Additionally, packages using GNU autotools will, if

package configuration failed or appears relevant, log the configuration process in detail

in, most usually, ``${PKG_BUILD_DIR}/config.log``.  

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 3.4. Package archive files and Git repositories"

### 3.4. Package archive files and Git repositories

Packages may have either or both of a SHA-256 message digest checked and to be extracted tarball

(set in ``${PKG_URL}``, ``${PKG_FNAME}``, and ``${PKG_SHA256SUM}``) and/or Git repository or set

thereof (set in ``${PKG_URLS_GIT}``.) Complementing these, an implicitly inferred or, in the

presence of both, explicit primary source directory is specified for each package in ``${PKG_SUBDIR}``.

Furthermore, these may be subject to download caching and/or setting up as well as maintaining

mirrors, including automatic cleanup as well as deduplication in both cases.  

A list of pertinent package variables and their formats follows:  

| Name           | Format                                          |

| -------------- | ----------------------------------------------- |

| PKG_FNAME      | ``<single file name>``                          |

| PKG_SHA256SUM  | ``<SHA-256 message digest>``                    |

| PKG_SUBDIR     | ``<relative or single directory name>``         |

| PKG_URL        | ``scheme:[//authority]path[?query][#fragment]`` |

| PKG_URLS_GIT   | ``[subdir=]URL[@branch]``                       |

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 3.5. Patches and ``vars`` files"

## 3.5. Patches and ``vars`` files

Package patches are applied prior and/or subsequent to (GNU autotools or similar) package

configuration during the ``configure_patch_pre`` and/or ``configure_patch`` build steps,

respectively (see section [4.1](#41-build-steps).) Patch files are searched for beneath

``patches/`` with the following globs and in-order:

* ``${PKG_NAME}-${PKG_VERSION}_pre.local.patch``

  or ``${PKG_NAME}_pre.local.patch`` (for packages lacking ``${PKG_VERSION}``)

* ``${PKG_NAME}-${PKG_VERSION}_pre.local@${BUILD_HNAME}.patch``

  or ``${PKG_NAME}_pre.local@${BUILD_HNAME}.patch`` (for packages lacking ``${PKG_VERSION}``)

* ``${PKG_NAME}/*.patch``

* ``${PKG_NAME}-${PKG_VERSION}.local.patch``

  or ``${PKG_NAME}.local.patch`` (for packages lacking ``${PKG_VERSION}``)

* ``${PKG_NAME}-${PKG_VERSION}.local@${BUILD_HNAME}.patch``

  or ``${PKG_NAME}.local@${BUILD_HNAME}.patch`` (for packages lacking ``${PKG_VERSION}``)

* ``${PKG_PATCHES_EXTRA}`` (if set)

If the default set of package build steps does not suffice, such as if additional commands

must be executed after package configuration or prior to building, or if an entire or all

build step must be replaced, overrides may be specified in the form of functions in the

package's ``vars/${PKG_NAME}.vars`` as well as ``vars.<group name>/${PKG_NAME}.vars``

``vars`` file(s). Consult section [4.1](#41-build-steps) for a list of package build steps

and how they are overriden.

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 4. Reference"

## 4. Reference

[//]: # "}}}"

[//]: # "{{{ 4.1. Build steps"

## 4.1. Build steps

Package builds are divided up into consecutively executed build steps until

completion or aborted on failure unless relaxed mode is enabled by passing

``-R``.  

Each build step corresponds to a function in the corresponding ``subr/pkg_*.subr``

script and may be overriden entirely by a function named ``pkg_<package name>_<build step>()``

or composed in terms of prior and/or subsequent execution by a function named

``pkg_<package name>_<build step>_pre()`` and/or ``pkg_<package name>_<build step>_post()``,

respectively, in the package's ``vars`` file. If a function named ``pkg_<package name>_all()``

exists, it will override all build steps.  

Build step functions receive the following arguments in the order specified:

| Name          | Description                                              |

| ------------- | -------------------------------------------------------- |

| \_group\_name | Package name                                             |

| \_pkg\_name   | Group name                                               |

| \_restart\_at | Optional list of build steps to restart package build at |

Build step status is tracked on a per-package basis by state files beneath

``${BUILD_WORKDIR}`` following the format ``.<package name>.<build step>``;

package build completion corresponds to the pseudo-build step ``finish``.

| Name                | Description                                                                                                                                                                                                                                              |

| ------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

| fetch_clean         | Delete and create ``${PKG_SUBDIR}``                                                                                                                                                                                                                      |

| fetch_download      | Download package archive & verify w/ SHA-256 message digest and/or clone Git repository/ies                                                                                                                                                              |

| fetch_extract       | Extract package archive, if any                                                                                                                                                                                                                          |

| configure_clean     | Delete and create ``${PKG_BUILD_DIR}``                                                                                                                                                                                                                   |

| configure_patch_pre | Apply ``chainport`` patches and/or patches beneath ``patches/`` prior to (GNU autotools or similar) configuration                                                                                                                                        |

| configure_autotools | Bootstrap (GNU autools or similar) environment, and install ``config.sub`` and ``config.cache``                                                                                                                                                          |

| configure_patch     | Apply patches beneath ``patches/`` and/or set in ``${PKG_PATCHES_EXTRA}`` after (GNU autotools or similar) configuration                                                                                                                                 |

| configure           | Perform package (GNU autools or similar or CMake) configuration w/ configuration-time set of environment variables                                                                                                                                       |

| build_clean         | Clean ``${PKG_BUILD_DIR}`` w/ ``make clean`` invocation                                                                                                                                                                                                  |

| build               | Call ``make(1)`` w/ build-time set of make variables                                                                                                                                                                                                     |

| install_clean       | Delete and create ``${PKG_DESTDIR}``                                                                                                                                                                                                                     |

| install_subdirs     | Create default directory hierarchy in ``${PKG_DESTDIR}``, optionally amended w/ ``${PKG_INSTALL_FILES_DESTDIR_EXTRA}``                                                                                                                                   |

| install_make        | Call ``make(1)`` w/ ``${PKG_INSTALL_TARGET}`` (defaults to ``install``) and installation-time set of make variables                                                                                                                                      |

| install_files       | Install ``${PKG_INSTALL_FILES}`` and/or ``${PKG_INSTALL_FILES_V2}``, fix directory and file mode bits within ``${PKG_DESTDIR}`` and optionally ``${PKG_DESTDIR_HOST}``, ``pkgconf(1)`` package files, and/or stripped binaries within ``${PKG_DESTDIR}`` |

|                     | Purge libtool ``.la`` files and install shared objects within ``${PKG_DESTDIR}`` w/ ``perk`` and corresponding symbolic links                                                                                                                            |

| install             | Install into ``${PKG_PREFIX}``, and optionally ``${PKG_DESTDIR_HOST}`` into ``${PREFIX}``, under mutex, and add package to ``${PREFIX}/pkglist.${PKG_BUILD_TYPE}`` (unless inhibited)                                                                    |

| install_rpm         | Build package RPM w/ auto-generated specifiation file based on ``etc/package.spec`` beneath ``${PREFIX_RPM}``                                                                                                                                            |

| clean               | Clean ``${PKG_BUILD_DIR}`` and/or ``${PKG_DESTDIR}`` and/or ``${PKG_DESTDIR_HOST}`` and/or ``${PKG_BASE_DIR}/${PKG_SUBDIR}`` as per ``-C build,dest,src``, resp., if any                                                                                 |

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 4.2. Build variables"

## 4.2. Build variables

The following variables are primarily defined in ``vars.env.d/*.env`` and may be

overriden on a per-build basis on the command-line, the environment, and/or

``${HOME}/midipix_build.vars``, ``${HOME}/.midipix_build.vars``, and/or

``../midipix_build.vars``, e.g.:

```shell

./build.sh -a nt64 -b release -D minipix,zipdist -P -v PREFIX_ROOT="${HOME}/midipix_tmp"

env ARCH=nt64 BUILD_KIND=release PREFIX_ROOT="${HOME}/midipix_tmp" ./build.sh -D minipix,zipdist -P -v

```

| Variable name    | Default value                        | Description                                                                   |

| ---------------- | ------------------------------------ | ----------------------------------------------------------------------------- |

| ARCH             | nt64                                 | Target 32-bit (nt32) or 64-bit (nt64) architecture                            |

| BUILD_DLCACHEDIR | ${PREFIX_ROOT}/dlcache               | Absolute pathname to package downloads cache root directory                   |

| BUILD_HNAME      | $(hostname)                          | Build system hostname                                                         |

| BUILD_KIND       | debug                                | Build w/ debugging (debug) or release compiler flags                          |

| PREFIX_LOCAL     | ${PREFIX}/localcross                 | Absolute pathname to local cross-toolchain root directory                     |

| BUILD_WORKDIR    | ${PREFIX}/tmp                        | Absolute pathname to temporary package build root directory                   |

| PREFIX           | ${PREFIX_ROOT}/${ARCH}/${BUILD_KIND} | Absolute pathname to architecture- & build type-specific build root directory |

| PREFIX_CROSS     | ${PREFIX}/${DEFAULT_TARGET}          | Absolute pathname to toolchain root directory                                 |

| PREFIX_MINGW32   | ${PREFIX}/x86_64-w64-mingw32         | Absolute pathname to MinGW toolchain root directory                           |

| PREFIX_MINIPIX   | ${PREFIX}/minipix                    | Absolute pathname to minipix distribution root directory                      |

| PREFIX_NATIVE    | ${PREFIX}/native                     | Absolute pathname to cross-compiled packages root directory                   |

| PREFIX_ROOT      | ${HOME}/midipix                      | Absolute pathname to top-level directory                                      |

| PREFIX_RPM       | ${PREFIX}/rpm                        | Absolute pathname to package RPM archive root directory                       |

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 4.3. File installation DSL"

## 4.3. File installation DSL

File and directory installation, comprising e.g. copying, moving, creating

symbolic links, setting owner and/or permission metadata, are expressed in

a descriptive domain-specific language and integrated with package building

via the package variable ``${PKG_INSTALL_FILES_V2}``, applying during

``install_files`` after the ``install_make`` build step, and ``${PKG_INSTALL_FILES_DESTDIR}``

and ``${PKG_INSTALL_FILES_DESTDIR_EXTRA}`` during ``install_subdirs``. The

``${PKG_INSTALL_FILES_V2}`` must adhere to the following syntax specified in EBNF:  

```

(*

SH_GLOB_PATTERN      = any valid portable shell pattern (see sh(1)); superset of PATHNAME

SH_SUBSTRING_PATTERN = any valid portable substring processing shell pattern (see sh(1));

                       superset of PATHNAME

PARAMETER            = any valid portable shell variable name except that [0-9] may occur

                       the beginning

PATHNAME             = any valid filename, directory name, relative or absolute pathname

                       excluding the characters NUL and NL

 *)

spec                 = { op_flag, } op_unary, "=", op_spec, "\n", { spec } ;

                     | { op_flag, } op_binary, op_spec, "=" op_spec, "\n", { spec } ;

                     | "#" COMMENT ;

op_unary             = "-" | "/" | "t" ;

op_binary            = ":" | "!" | "@" | "+" | "g" | "m" | "o" | "T" ;

op_flag              = "?" ;

op_spec              = pattern_spec | PATHNAME | expr_spec | op_spec ;

pattern_spec         = "%<", SH_GLOB_PATTERN, ">" ;

expr_spec            = "%[", expr, { sexpr_spec }, "%]" ;

expr                 = [ "@" ], "0" .. "9" | "DNAME" | "FNAME" | "ITEM" | PARAMETER ;

sexpr_spec           = sexpr_op_unary, SH_SUBSTRING_PATTERN, { sexpr } ;

sexpr_op_unary       = "##" | "#" | "%%" | "%" ;

```

Single ``"="`` characters in ``spec``, the ``"%<"`` and ``"%["`` character

sequences in ``pattern_spec`` and ``expr_spec``, resp., and the ``sexpr_op_unary``

as well as ``sexpr_op_binary`` characters or character sequences may be

escaped with a single backslash (``"\"``.) ``SH_SUBSTRING_PATTERN`` differs

from ``SH_GLOB_PATTERN`` solely in that any of ``sexpr_op_unary`` and

``sexpr_op_binary`` occuring at the beginning of or in the former must

be escaped with a single backslash (``"\"``,) e.g. ``"#\#pattern"`` and

``"%\%pattern"``, etc. and ``"#pat\%ern"`` and ``%patt\#ern", etc., resp.  

Named parameters (``PARAMETER``) are supplied via the ``-p name=value``

argument to ``rtl_install()``, whereas numbered parameters are for

internal usage only; the ``"DNAME"``, ``"FNAME"``, and ``"ITEM"`` parameters

lazily evaluate to the directory name, file (aka base) name, and full

pathname of the current item being processed relative to a specification

with a pattern in it.

The following parameters are defined by default during ``install_files``:

| Name           | Value                                  |

| -------------  | -------------------------------------- |

| _builddir      | ${PKG_BUILD_DIR}                       |

| _destdir       | ${PKG_BASE_DIR}/${PKG_DESTDIR}         |

| _destdir_host  | ${PKG_BASE_DIR}/${PKG_DESTDIR_HOST}    |

| _files         | ${MIDIPIX_BUILD_PWD}/files/${PKG_NAME} |

| _name          | ${PKG_NAME}                            |

| _prefix        | ${PKG_PREFIX}                          |

| _prefix_host   | ${PREFIX}                              |

| _prefix_native | ${PREFIX_NATIVE}                       |

| _subdir        | ${PKG_BASE_DIR}/${PKG_SUBDIR}          |

| _target        | ${PKG_TARGET}                          |

| _version       | ${PKG_VERSION:-}                       |

| _workdir       | ${BUILD_WORKDIR}                       |

The following operation flags are defined:

| Flag      | Description              |

| --------- | ------------------------ |

| ``?``     | Continue on soft failure |

The following operations are defined:

| Operation      | Arity  | Description                                                      |

| -------------- | ------ | ---------------------------------------------------------------- |

| ``-``          | Unary  | Remove directories and/or files                                  |

| ``/``          | Unary  | Create directories or trees thereof                              |

| ``t``          | Unary  | touch(1) files and/or directories                                |

| ``:``          | Binary | Copy directories and/or files                                    |

| ``!``          | Binary | Move/rename directories and/or files                             |

| ``@``          | Binary | Create/update symbolic links                                     |

| ``+``          | Binary | Copy directories and/or files if newer and follow symbolic links |

| ``g``          | Binary | Set group owner of files and/or directories                      |

| ``m``          | Binary | Set mode bits of files and/or directories                        |

| ``o``          | Binary | Set user and/or group owner of files and/or directories          |

| ``T``          | Binary | touch(1) files and/or directories with timestamp                 |

The following expression modifiers are defined:

| Modifier       | Description                               |

| -------------- | ----------------------------------------- |

| ``@``          | Recursively reevaluate after substituting |

The following subexpression operators are defined:

| Operation      | Arity  | Description                                                      |

| -------------- | ------ | ---------------------------------------------------------------- |

| ``##``         | Unary  | Remove largest prefix from left-hand side                        |

| ``#``          | Unary  | Remove prefix from left-hand side                                |

| ``%%``         | Unary  | Remove largest postfix from right-hand side                      |

| ``%``          | Unary  | Remove postfix from right-hand side                              |

```shell

#

# Examples:

# 

#

# Create directory %[_minipix]/bin and copy all files

# in %[_minipix_dist]/bin/ to %[_minipix]/bin/ with

# identical file names.

/=%[_minipix]/bin

?%[_minipix_dist]/bin/%<*>=%[_minipix]/bin/%[FNAME]

#

# Rename all files in share/info/ matching *.info to

# their filenames with the `.info' postfix removed and

# `-2.64.info' appended and all files in share/man/man1/

# matching *.1 with the `.1' postfix removed and -2.64.1

# appended.

!share/info/%<*.info>=share/info/%[FNAME%.info]-2.64.info

!share/man/man1/%<*.1>=share/man/man1/%[FNAME%.1]-2.64.1

#

# Create/update symbolic links named include/ffi.h and

# include/ffitarget.h with ../lib/libffi-3.2.1/include/ffi.h

# and ../lib/libffi-3.2.1/include/ffitarget.h as targets, resp.

@../lib/libffi-3.2.1/include/ffi.h=include/ffi.h

@../lib/libffi-3.2.1/include/ffitarget.h=include/ffitarget.h

#

# Manual invocation:

PKG_INSTALL_FILES_V2="

        [ ... ]

";

rtl_install                                                     \

                -p "_builddir=${PKG_BASE_DIR}/${PKG_BUILD_DIR}" \

                -p "_minipix=${PREFIX_MINIPIX##*/}"             \

                -p "_minipix_dist=${PREFIX}/minipix_dist"       \

                -p "_native=${PREFIX_NATIVE##*/}"               \

                -p "_subdir=${PKG_BASE_DIR}/${PKG_SUBDIR}"      \

                -p "_target=${PKG_TARGET}"                      \

                -n -- "${PREFIX}"                               \

                "${PKG_INSTALL_FILES_V2}"; then

        return 1;

fi;

#

# Usage screen:

usage: rtl_install [-i] [-I ifs] [-n] [-p name=val] [-v] prefix spec_list

       -i...........: continue on soft errors

       -I ifs.......: process spec_list with ifs instead of NL

       -n...........: perform dry run

       -p name=val..: set named parameter

       -v...........: increase verbosity

       prefix.......: pathname prefix

       spec_list....: ifs-separated list of specs

```

[Back to top](#table-of-contents)

[//]: # "}}}"

[//]: # "{{{ 4.4. Package variables"

### 4.4. Package variables

The following variables are package-specific and receive their value from either

top-level defaults defined in ``vars.env.d/*.env``, build group-specific defaults from the

build group the package pertains to and defined in its corresponding file beneath

``groups.d/`` or ``groups.d/[0-9][0-9][0-9].<group name>.d/``, or package-specific overrides

defined either in the latter and/or in its corresponding file beneath ``vars/``, with one of

the following prefixes:

| Variable name prefix                              |

| ------------------------------------------------- |

| DEFAULT                                           |

| DEFAULT_``${BUILD_TYPE}``                         |

| DEFAULT_``${GROUP_NAME}``                         |

| ``${GROUP_NAME}``                                 |

| [PKG_``${RELATED_PACKAGE(S)}``]                   |

| [PKG_``${RELATED_PACKAGE(S)}``_``${BUILD_KIND}``] |

| PKG_``${NAME}``                                   |

| PKG_``${NAME}``_``${BUILD_KIND}``                 |

Additionally, overrides may be specified on a per-build basis on the command-

line, with each variable prefixed w/ ``PKG_``, e.g.:

``./build.sh [ ... ] PKG_ZSH_CC="/usr/bin/clang"``.  

The minimum set of package variables that must be provided is ``SHA256SUM, URL,

VERSION`` and/or ``URLS_GIT``, respectively.

[//]: # "{{{ 4.4.1 Package variable types"

## 4.4.1 Package variable types