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chroot

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• Started 12 years ago by alanyih
• Latest reply from alanyih
• This topic is not a support question

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1. 

   alanyih
   

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   Create a chroot (use last tazdev)

   cross.txt

   26 Create a chroot (use last tazdev)
   27 ---------------------------------
   28 # tazdev gen-chroot --arch=arm
   29 # tazdev chroot
   30
   31 Clone cookutils to get last cook and cross

   # wget http://mirror.slitaz.org/packages/cooking/tazdev-1.9.tazpkg
   # tazpkg -i tazdev-1.9.tazpkg

   Posted 11 years ago #
2. 

   alanyih
   

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   qemu-arm-static chroot

   1.
   root@slitaz:~# uname -a
   Linux slitaz 2.6.37-slitaz #1 SMP Fri May 10 17:42:01 CST 2013 i686 GNU/Linux

   2.
   root@slitaz:~# tazdev -c /opt/rootfs-armhf/

   Mounting virtual filesystems... [ Done ]
   Chrooting to: /opt/rootfs-armhf/

   3.
   root@slitaz:/# uname -m
   armv6l

   4.
   root@slitaz:/# readelf -A /lib/libc-2.13.so
   Attribute Section: aeabi
   File Attributes
   Tag_CPU_name: "6"
   Tag_CPU_arch: v6
   Tag_ARM_ISA_use: Yes
   Tag_THUMB_ISA_use: Thumb-1
   Tag_FP_arch: VFPv2
   Tag_ABI_PCS_wchar_t: 4
   Tag_ABI_FP_denormal: Needed
   Tag_ABI_FP_exceptions: Needed
   Tag_ABI_FP_number_model: IEEE 754
   Tag_ABI_align_needed: 8-byte
   Tag_ABI_align_preserved: 8-byte, except leaf SP
   Tag_ABI_enum_size: int
   Tag_ABI_HardFP_use: SP and DP
   Tag_ABI_VFP_args: VFP registers
   Tag_DIV_use: Not allowed

   5.
   root@slitaz:/# head -5 /var/lib/tazpkg/installed.md5
   bbb30be1a2c704154f58e2df501e35fd busybox-1.20.2-armhf.tazpkg
   a82e5ffd86838571addf3eee3f418c7b dropbear-2012.55-armhf.tazpkg
   7015c541e061e277c07f023073faad92 gcc-lib-base-4.6.3-armhf.tazpkg
   d165510417ebc3d1e6bf37c96b9db8d8 gettext-base-0.18.1.1-armhf.tazpkg
   2f4a5d282889c6fbd228a974822bd0d9 glibc-base-2.13-armhf.tazpkg

   6.
   root@slitaz:/# tazpkg list | tail -2
   18 packages installed

   7.
   root@slitaz:/# du -sh /
   13.4M /
   root@slitaz:/#

   

   Attachments

   1. qemu-arm-static.jpg (117.6 KB, 1,681 downloads) 11 years old

   Posted 11 years ago #
3. 

   alanyih
   

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   Administrator

   qemu user mode and binfmt_misc

   1.1 Features
   http://qemu.weilnetz.de/qemu-doc.html#Introduction

   QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.

   QEMU has two operating modes:

   Full system emulation. In this mode, QEMU emulates a full system (for example a PC), including one or several processors and various peripherals. It can be used to launch different Operating Systems without rebooting the PC or to debug system code.

   User mode emulation. In this mode, QEMU can launch processes compiled for one CPU on another CPU. It can be used to launch the Wine Windows API emulator (http://www.winehq.org) or to ease cross-compilation and cross-debugging.

   Kernel Support for miscellaneous (your favourite) Binary Formats v1.1
   ==============================================================
   https://www.kernel.org/doc/Documentation/binfmt_misc.txt

   This Kernel feature allows you to invoke almost (for restrictions see below)
   every program by simply typing its name in the shell.
   This includes for example compiled Java(TM), Python or Emacs programs.

   To achieve this you must tell binfmt_misc which interpreter has to be invoked
   with which binary. Binfmt_misc recognises the binary-type by matching some bytes
   at the beginning of the file with a magic byte sequence (masking out specified
   bits) you have supplied. Binfmt_misc can also recognise a filename extension
   aka '.com' or '.exe'.

   First you must mount binfmt_misc:
   mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc

   Ref:
   https://wiki.edubuntu.org/UbuntuDevelopment/Ports

   Posted 11 years ago #
4. 

   alanyih
   

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   Administrator

   rootfs-armhf

   1.
   # wget http://mirror.slitaz.org/packages/cooking/util-linux-mount-2.21.1.tazpkg
   # tazpkg -i util-linux-mount-2.21.1.tazpkg

   # wget http://arm.balinor.net/slitaz/armhf/slitaz-armhf-mini-2012-12-14.zip
   # unzip slitaz-armhf-mini-2012-12-14.zip

   2.
   root@slitaz:~# file slitaz-armhf-mini-2012-12-14.img
   slitaz-armhf-mini-2012-12-14.img: x86 boot sector; partition 1: ID=0x6, starthead 1, startsector 63, 48132 sectors; partition 2: ID=0x83, starthead 0, startsector 48195, 915705 sectors, code offset 0xb8

   root@slitaz:~# fdisk -lu slitaz-armhf-mini-2012-12-14.img

   Disk slitaz-armhf-mini-2012-12-14.img: 536 MB, 536870912 bytes
   255 heads, 63 sectors/track, 65 cylinders, total 1048576 sectors
   Units = sectors of 1 * 512 = 512 bytes

   Device Boot Start End Blocks Id System
   slitaz-armhf-mini-2012-12-14.img1 63 48194 24066 6 FAT16
   slitaz-armhf-mini-2012-12-14.img2 48195 963899 457852+ 83 Linux
   root@slitaz:~#

   3.
   root@slitaz:~# mount -o,offset=$((48195*512)) slitaz-armhf-mini-2012-12-14.img /mnt/raspi

   4.
   root@slitaz:~# cp -a /mnt/raspi /opt/rootfs-armhf

   5.
   root@slitaz:~# ls -l /opt/rootfs-armhf
   total 68
   drwxr-xr-x 2 root root 4096 Dec 3 2012 bin
   drwxr-xr-x 2 root root 4096 Dec 14 2012 boot
   drwxr-xr-x 8 root root 4096 Dec 3 2012 dev
   drwxr-xr-x 7 root root 4096 Dec 14 2012 etc
   drwxr-xr-x 2 root root 4096 Dec 3 2012 home
   lrwxrwxrwx 1 root root 12 Jun 19 20:03 init -> /bin/busybox
   drwxr-xr-x 2 root root 4096 Dec 3 2012 lib
   drwx------ 2 root root 4096 Dec 3 2012 lost+found
   drwxr-xr-x 5 root root 4096 Dec 3 2012 media
   drwxr-xr-x 2 root root 4096 Dec 3 2012 mnt
   drwxr-xr-x 2 root root 4096 Dec 3 2012 proc
   drwxr-x--- 2 root root 4096 Dec 3 2012 root
   drwxr-xr-x 2 root root 4096 Dec 3 2012 run
   drwxr-xr-x 2 root root 4096 Dec 3 2012 sbin
   drwxr-xr-x 2 root root 4096 Dec 3 2012 sys
   drwxrwxrwt 2 root root 4096 Dec 3 2012 tmp
   drwxr-xr-x 8 root root 4096 Dec 14 2012 usr
   drwxr-xr-x 11 root root 4096 Dec 3 2012 var

   root@slitaz:~# file /opt/rootfs-armhf/lib/libc-2.13.so
   /opt/rootfs-armhf/lib/libc-2.13.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, stripped

   root@slitaz:~# du -sh /opt/rootfs-armhf
   9.2M /opt/rootfs-armhf
   root@slitaz:~#

   Posted 11 years ago #
5. 

   alanyih
   

   offline

   Administrator

   Chrooting to: /opt/rootfs-armhf/

   root@slitaz:~# ls -l /opt/rootfs-armhf

   1. download qemu-arm-static-1.1.2.tazpkg
   http://tiny.cc/rh7wyw
   # tazpkg -i qemu-arm-static-1.1.2.tazpkg

   2. copy qemu-arm-static to rootfs-armhf
   # cp /usr/bin/qemu-arm-static /opt/rootfs-armhf/usr/bin

   3. Mount the binfmt_misc handler
   # modprobe binfmt_misc
   # mount -t binfmt_misc binfmt_misc /proc/sys/fs/binfmt_misc

   4. register our format with the kernel via the procfs
   root@slitaz:~# echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:' > /proc/sys/fs/binfmt_misc/register

   5. check register
   root@slitaz:~# cat /proc/sys/fs/binfmt_misc/arm
   enabled
   interpreter /usr/bin/qemu-arm-static
   flags:
   offset 0
   magic 7f454c4601010100000000000000000002002800
   mask ffffffffffffff00ffffffffffff00fffeffffff

   6. chroot rootfs-armhf
   root@slitaz:~# tazdev -c /opt/rootfs-armhf/

   Mounting virtual filesystems... [ Done ]
   Chrooting to: /opt/rootfs-armhf/

   7.
   root@slitaz:/# uname -m
   armv6l

   8.
   root@slitaz:/# echo -e 'nameserver 8.8.8.8\n' > /etc/resolv.conf
   root@slitaz:/# nslookup 'www.slitaz.org'
   Server: 8.8.8.8
   Address 1: 8.8.8.8 google-public-dns-a.google.com

   Name: 'www.slitaz.org'
   Address 1: 94.23.61.29 pangolin.pimentvert.com
   Address 2: 91.121.171.224 ks362096.kimsufi.com
   root@slitaz:/#

   Posted 11 years ago #
6. 

   alanyih
   

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   GNU C Library (EGLIBC) stable release version 2.13,

   GNU C Library stable release version 2.13,

   root@slitaz:~# file /opt/rootfs-armhf/lib/libc-2.13.so
   /opt/rootfs-armhf/lib/libc-2.13.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, stripped

   1. slitaz-armhf: eglibc-2.13
   root@slitaz:/# file /lib/libc-2.13.so
   /lib/libc-2.13.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, stripped
   root@slitaz:/#

   root@slitaz:/# /lib/libc-2.13.so
   GNU C Library (EGLIBC) stable release version 2.13, by Roland McGrath et al.
   Copyright (C) 2011 Free Software Foundation, Inc.
   This is free software; see the source for copying conditions.
   There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
   PARTICULAR PURPOSE.
   Compiled by GNU CC version 4.6.3.
   Compiled on a Linux 3.2.14 system on 2012-06-30.
   Available extensions:
   crypt add-on version 2.1 by Michael Glad and others
   GNU Libidn by Simon Josefsson
   Native POSIX Threads Library by Ulrich Drepper et al
   Support for some architectures added on, not maintained in glibc core.
   BIND-8.2.3-T5B
   libc ABIs: UNIQUE
   For bug reporting instructions, please see:
   <http://www.eglibc.org/issues/>.

   2.
   root@slitaz:/# exit

   Unmounting virtual filesystems... [ Done ]

   3. slitaz-4.0: glibc-2.13
   root@slitaz:~# uname -a
   Linux slitaz 2.6.37-slitaz #1 SMP Fri May 10 17:42:01 CST 2013 i686 GNU/Linux

   root@slitaz:~# file /lib/libc-2.13.so
   /lib/libc-2.13.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.30, stripped

   root@slitaz:~# /lib/libc-2.13.so
   GNU C Library stable release version 2.13, by Roland McGrath et al.
   Copyright (C) 2011 Free Software Foundation, Inc.
   This is free software; see the source for copying conditions.
   There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
   PARTICULAR PURPOSE.
   Compiled by GNU CC version 4.5.2.
   Compiled on a Linux 2.6.37 system on 2012-03-13.
   Available extensions:
   crypt add-on version 2.1 by Michael Glad and others
   GNU Libidn by Simon Josefsson
   Native POSIX Threads Library by Ulrich Drepper et al
   BIND-8.2.3-T5B
   libc ABIs: UNIQUE IFUNC
   For bug reporting instructions, please see:
   <http://www.gnu.org/software/libc/bugs.html>.

   root@slitaz:~#

   Posted 11 years ago #
7. 

   alanyih
   

   offline

   Administrator

   Compiling with qemu-arm-static chroot

   Target: arm-slitaz-linux-gnueabi

   --build=arm-slitaz-linux-gnueabi --host=arm-slitaz-linux-gnueabi

   1.
   root@slitaz:~# uname -a
   Linux slitaz 2.6.37-slitaz #1 SMP Fri May 10 17:42:01 CST 2013 i686 GNU/Linux

   2.
   root@slitaz:~# tazdev -c /opt/rootfs-armhf

   Mounting virtual filesystems... [ Done ]
   Chrooting to: /opt/rootfs-armhf

   3.
   root@slitaz:/# gcc -v
   Using built-in specs.
   COLLECT_GCC=/usr/bin/gcc
   COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-slitaz-linux-gnueabi/4.6.3/lto-wrapper
   Target: arm-slitaz-linux-gnueabi
   Configured with: /home/slitaz/wok/gcc/source/gcc-4.6.3/configure --prefix=/usr --libexecdir=/usr/lib --enable-languages=c,c++ --enable-shared --enable-c99 --enable-long-long --enable-__cxa_atexit --with-system-zlib --enable-plugin --disable-multilib --disable-libssp --disable-checking --disable-werror --disable-bootstrap --enable-clocale=gnu --enable-lto --enable-threads=posix --with-arch=armv6 --with-fpu=vfp --with-float=hard --with-pkgversion=SliTaz --build=arm-slitaz-linux-gnueabi --host=arm-slitaz-linux-gnueabi
   Thread model: posix
   gcc version 4.6.3 (SliTaz)

   4.
   root@slitaz:/# echo 'int main() { return 0; }' > test.c

   root@slitaz:/# gcc -o test.o test.c

   root@slitaz:/# ls -l test*
   -rw-r--r-- 1 root root 25 Jun 9 13:59 test.c
   -rwxr-xr-x 1 root root 6790 Jun 9 13:59 test.o

   5.
   root@slitaz:/# file test.o
   test.o: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, not stripped

   root@slitaz:/# readelf -A test.o
   Attribute Section: aeabi
   File Attributes
   Tag_CPU_name: "6"
   Tag_CPU_arch: v6
   Tag_ARM_ISA_use: Yes
   Tag_THUMB_ISA_use: Thumb-1
   Tag_FP_arch: VFPv2
   Tag_ABI_PCS_wchar_t: 4
   Tag_ABI_FP_denormal: Needed
   Tag_ABI_FP_exceptions: Needed
   Tag_ABI_FP_number_model: IEEE 754
   Tag_ABI_align_needed: 8-byte
   Tag_ABI_align_preserved: 8-byte, except leaf SP
   Tag_ABI_enum_size: int
   Tag_ABI_HardFP_use: SP and DP
   Tag_ABI_VFP_args: VFP registers
   Tag_DIV_use: Not allowed
   root@slitaz:/#

   Posted 11 years ago #
8. 

   jainkkapil
   

   offline

   Member

   Guys,
   there seems to be this as a bigger problem. Every time someone wants to start out on development, setting up the build system is a very big problem. Can we have something stable iso which has the required setup inbuilt? Whosoever is done with completing the setup can either create an iso out of his system and post it or just make a small script out of the process so that preparing the system is not a pain for everyone.

   Posted 11 years ago #
9. 

   alanyih
   

   offline

   Administrator

   Ref:
   http://forum.slitaz.org/topic/chroot/page/2#post-23303

   Slitaz Cookutils
   http://hg.slitaz.org/cookutils/raw-file/tip/doc/cookutils.en.html

   Slitaz armhf toolchain
   http://arm.balinor.net/slitaz/armhf/slitaz-arm-toolchain-armhf-20120630.tar.bz2

   yourself
   http://hg.slitaz.org/cookutils/file/3d20efa09240/doc/cross.txt

   1. slitaz-arm-toolchain-armhf-20120630.tar.bz2 =
   45 # cross download + 46 # cross compile

   2. keep it simple
   26 Create a chroot (use last tazdev)
   39 Setup the build environment, <strike>get source and compile a cross toolchain</strike>

   3. cross.txt
   http://hg.slitaz.org/cookutils/file/3d20efa09240/doc/cross.txt

   cookutils view doc/cross.txt @ 558:3d20efa09240

   [..]
   17 HOWTO:
   18 When building a cross toolchain it's better to understand what is a
   19 linker or C compiler such as GCC. The configure option --target is
   20 used by 'cross' to build cross-tools. When the toolchain is built on
   21 your machine you can then build packages with cook and the wok. Cross
   22 uses by default the same source tarballs as cook but the path can be
   23 changed via the config file. Configuration is: cross.conf. Here is a
   24 cmdline howto:
   25
   26 Create a chroot (use last tazdev)
   27 ---------------------------------
   28 # tazdev gen-chroot --arch=arm
   29 # tazdev chroot
   30
   31 Clone cookutils to get last cook and cross
   32 ------------------------------------------
   33 # tazpkg -gi mercurial
   34 # tazpkg -gi make
   35 # cd && hg clone http://hg.slitaz.org/cookutils
   36 # cd cookutils
   37 # make install-cross
   38
   39 Setup the build environment, get source and compile a cross toolchain
   40 ---------------------------------------------------------------------
   41 # cook arm-setup
   42 # cook setup
   43 (vi/nano /etc/slitaz/cross.conf)
   44 # cross check
   45 # cross download
   46 # cross compile
   47
   48 Test the cross toolchain
   49 ------------------------
   50 # cross testsuite
   51
   52 AUTHORS
   53 Written by Christophe Lincoln

   Posted 10 years ago #

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