Add README file

Comments from all package files have been relocated into the README
file.

Signed-off-by: Sébastien Gross <seb•ɑƬ•chezwam•ɖɵʈ•org>

1 files changed, 79 insertions, 0 deletions

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+# Package builder
+
+This directory contains files to build packages for several Linux
+distributions.
+
+# APK
+
+[APKBUILD]() containts all definition to build APK packages for Alpine
+linux.
+
+From a fresh install setup the build environment for a reqular user
+named `pkg-builder` (user name is up to you):
+
+```
+adduser pkg-builder
+addgroup pkg-builder abuild
+echo '%abuild ALL=(ALL) NOPASSWD:/sbin/apk, /bin/mkdir -p /etc/apk/keys, /bin/cp -i *.pub /etc/apk/keys/' > /etc/sudoers.d/abuild
+chmod 0400 /etc/sudoers.d/abuild
+apk add alpine-sdk
+```
+
+Build the package as `pkg-builder`:
+
+```
+abuild-keygen -nai
+abuild -r
+```
+
+# PKG
+
+[PKGBUILD]() contains all definition to build Archlinux packages.
+
+Run following commands:
+
+```
+sudo pacman -S --noconfirm fakeroot binutils namcap
+makepkg --noconfirm -Cfsir PKGBUILD
+```
+
+You can check the packages using `namcap`:
+
+```
+namcap -i squashfs-tools-*.pkg.tar.zst  PKGBUILD
+```
+
+# RPM
+
+[squashfs-tools-ng.spec]() contains all definitions to build RPM
+packages.
+
+## CentOS, Fedora
+
+Run following commands:
+
+```
+yum install -y rpm-build spectool
+rpmdev-setuptree
+spectool -g -R squashfs-tools-ng.spec
+rpmspec --parse squashfs-tools-ng.spec | grep BuildRequires | cut -d' ' -f2  | xargs sudo yum install -y
+rpmbuild --clean -ba squashfs-tools-ng.spec
+```
+
+## OpenSUSE
+
+Run following commands:
+
+```
+zypper install -y rpm-build
+rpmspec --parse squashfs-tools-ng.spec | grep Source0 | awk '{print $2}' | xargs  wget -N -P $(rpm --eval '%{_sourcedir}')
+rpmspec --parse squashfs-tools-ng.spec | grep BuildRequires | cut -d' ' -f2  | xargs sudo zypper install -y
+rpmbuild --clean -ba squashfs-tools-ng.spec
+```
+
+Note:
+* `spectool` does not natively exists on OpenSUSE, hence source has to
+   be downloaded manually.
+* `zypper` is used intead of `yum`.
+
+