Porting Gentoo to DragonFly

Introduction Gentoo Benefits How I port

.

......Porting Gentoo to DragonFly

Naohiro Aota

03/20 2011

Naohiro Aota Porting Gentoo to DragonFly


.. Presentation Aims

To show Gentoo benefits

To get more Gentoo/BSD usersTo improve Gentoo/BSD




To show Gentoo benefitsTo get more Gentoo/BSD users

To improve Gentoo/BSD




To show Gentoo benefitsTo get more Gentoo/BSD usersTo improve Gentoo/BSD



.. Agenda

Gentoo and Gentoo/*BSDGentoo Benefits: Ports vs Portage(How I port Gentoo)



.. About DragonFly?

Visit http://www.dragonflybsd.org/


http://www.dragonflybsd.org/


.. About Gentoo

Linux distribution

without rpmwithout debbuild everything from sourcelike ports and pkgsrc



.. Portage

Package management and build systemebuild: package file

bash scriptexecuted within special environment



.. Getnoo/*BSD

one of Gentoo projectsBSD based Gentoo

like Debian/kFreeBSD



.. Gentoo/*BSD (2)

kernel C library/userlandDebian/kFreeBSD FreeBSD GNUGentoo/*BSD *BSD *BSD

Gentoo/*BSD support

FreeBSD (7.2 and 8.0 on x86)

unofficial amd64 is also available

NetBSD (5.0 on x86) (experiment)DragonFly (2.6.3) (unofficial)



.. Portage Repository

like Ports, Portage has local repository tree

FreeBSD Ports /usr/portseditors/emacsMakefile

Gentoo Portage /usr/portageapp-editors/emacsemacs-18.59-r6.ebuild<snip>emacs-23.3.ebuild

Use command line tool to install package

No “cd”, just “emerge foobar”



.. USE flag

FreeBSD ports

WITH_PNG=true

Gentoo Portage

USE=”png”



.. Why Gentoo?

Gentoo = build everything from source

Why not Ports?Why not pkgsrc?Why Gentoo?Talk about Gentoo benefits



.. Why Gentoo?

Gentoo = build everything from sourceWhy not Ports?Why not pkgsrc?Why Gentoo?

Talk about Gentoo benefits



.. Why Gentoo?

Gentoo = build everything from sourceWhy not Ports?Why not pkgsrc?Why Gentoo?Talk about Gentoo benefits



.. Able to select version

Old version providedeselect



.. eselect

FreeBSD ports

lang/python25, python26, python27, python31

Gentoo Portage

dev-lang/pythoneselect



.. Parallel build

Ports: build B -> C -> APortage: parallel package installation

build B and C in paralleland then build A



.. news item

notify important changes

Ports: DONT forget to read /usr/ports/UPDATINGPortage: notification displayed

package specific news

Ports: grep AFFECTS linePortage: hide not affecting news



.. multi repositories

handle multi repositoriesrepository management tool: layman

support many sync methodjust one command sync all repositories



.. sandbox

To avoid evil packages

Separate install process from systemAvoid read from/write to system



.. sandbox problem with DragonFly

sandbox read /proc to determine process nameDragonFly return different errnoUse LD_PRELOAD hack

static linked /bin/*dynamic lined libgcc



.. OpenRC

service management systemDependency based startupParallel startup/shutdown



.. Catalyst

release metatool used for creating releases based on GentooLinux

LiveCDinstall minimal file



.. Catalyst problem

Linuxism / GNUism / bashism

sed



.. Conclusion

Portage is much like Ports

but has superior features

Maintaining Portage package may help *BSD

Detect Linuxism, GNUism and bashismsending patch to upstream



.. Detail in porting

(maybe) boring technical details(maybe) sleep time ;)



.. roadmap

Install official DragonFlyInstall PortageCreate repository for DragonFlyWrite system packagesBuild, fix, and build . . .



.. Install Portage

Install Pythonand just unpack Portage sourcerun self test script

patch to fix mkdir(“/”) needed



.. Setup tree for DragonFly

Create own repository for x86-dfbsdRepository layout

repository namearchitecture supportDragonFly system package category



.. profiles

Specify system core packagesWhat package should not be usedWhat USE flag should/should not be used



.. baselayout

Gentoo primitive packageBasic configuration files/etc/hosts, shells . . .need to work on DragonFly



.. sandbox

Feature

a Gentoo utilSeparate install process from systemAvoid read from/write to system

Problem

/proc entryERANGE vs ENAMETOOLONG



.. OpenRC

Feature

Gentoo service management systemDependency based service startup and shutdown

Problem

When shutdown

Wait for all process to stopKernel thread (pid = -1) exists and cannot be killed



.. ld-elf.so.2 problem

Problem

Cannot load any librarycause segmentation fault

Solution

need to change binary formatfrom “em=freebsd”, “targ_emul=elf_i386_fbsd”to “em=386bsd”, “targ_emul=elf_i386”



.. linking problems

Problem

“sandbox” access check problemLD_PRELOAD hack not worked

/bin/* static linked

Solution

Changed to link dynamically to libc.so



.. libgcc linking problem

Problem

/bin/* dynamically linked to libgcc_s.so under /usr

Solution

Modify dragonfly-spec.h to link libgcc statically


Technology

Porting Gentoo to DragonFly