Difference between revisions of "Create Debian sysroots"

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(Prerequisites)
 
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=== Prerequisites ===
 
=== Prerequisites ===
  
[[Debian Linux Post Install Steps| Debian]] or [[Ubuntu Linux Post Install Steps | Ubuntu]] or any system that can run [https://wiki.debian.org/Debootstrap debootstrap].
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[[Debian Linux Post Install Steps| Debian]] or [[Ubuntu Linux Post Install Steps | Ubuntu]] or any system that can run [https://wiki.debian.org/Debootstrap debootstrap], with a configured QEMU user emulator. In practice only Debian and Ubuntu will work.
  
=== Install debootstrap ===
+
=== Install debootstrap and associated tools ===
  
  apt install -y debootstrap
+
  apt install -y binfmt-support qemu qemu-user-static debootstrap
  
 
=== Run debootstrap ===
 
=== Run debootstrap ===
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cd /tmp/sysroots
 
cd /tmp/sysroots
 
arches="amd64,x86_64-linux-gnu arm64,aarch64-linux-gnu mips,mips-linux-gnu mips64el,mips64el-linux-gnuabi64 ppc64el,powerpc64le-linux-gnu"
 
arches="amd64,x86_64-linux-gnu arm64,aarch64-linux-gnu mips,mips-linux-gnu mips64el,mips64el-linux-gnuabi64 ppc64el,powerpc64le-linux-gnu"
for arch in $arches; do IFS=","; set $arch; debootstrap --arch $1 --variant=buildd stable $2 http://deb.debian.org/debian; unset IFS; done</nowiki>
+
for arch in $arches; do IFS=","; set $arch; qemu-debootstrap --arch "$1" --variant=buildd stable "$2" http://deb.debian.org/debian; unset IFS; done</nowiki>
  
 
=== Fix symlinks ===
 
=== Fix symlinks ===
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  for arch in $arches; do IFS=","; set $arch; find "$2" -type l -lname '/*' -exec sh -c 'file="$0"; dir=$(dirname "$file"); target=$(readlink "$0"); prefix=$(dirname "$dir" | sed 's@[^/]*@\.\.@g'); newtarget="$prefix$target"; ln -snf $newtarget $file' {} \; ; unset IFS; done
 
  for arch in $arches; do IFS=","; set $arch; find "$2" -type l -lname '/*' -exec sh -c 'file="$0"; dir=$(dirname "$file"); target=$(readlink "$0"); prefix=$(dirname "$dir" | sed 's@[^/]*@\.\.@g'); newtarget="$prefix$target"; ln -snf $newtarget $file' {} \; ; unset IFS; done
 +
 +
== Host machine ==
 +
 +
=== Create directories ===
 +
 +
cd $HOME
 +
arches="x86_64-linux-gnu aarch64-linux-gnu mips-linux-gnu mips64el-linux-gnuabi64 powerpc64le-linux-gnu"
 +
for arch in $arches; do mkdir -p $HOME/cross/sysroot/$arch/{lib,usr/{include,lib}}; done
 +
 +
=== Copy sysroots ===
 +
 +
for arch in $arches; do for dir in /lib/ /usr/{include,lib}; do rsync -a ubuntu.local:/tmp/sysroots/$arch/$dir/ $HOME/cross/sysroot/$arch$dir; done; done
 +
 +
== Debootstrap machine (again) ==
 +
 +
=== Cleanup ===
 +
 +
Still as root:
 +
 +
rm -rf /tmp/sysroots
  
 
== See also ==
 
== See also ==
  
 
* [https://wiki.debian.org/Debootstrap debootstrap]
 
* [https://wiki.debian.org/Debootstrap debootstrap]
 +
* [https://www.debian.org/ports Debian ports]

Latest revision as of 14:55, 24 November 2019


Introduction

We'll create Debian sysroots suitable for a GCC cross compiler.

Debootstrap machine

Everything below runs on the debootstrap machine as root:

sudo -i

Prerequisites

Debian or Ubuntu or any system that can run debootstrap, with a configured QEMU user emulator. In practice only Debian and Ubuntu will work.

Install debootstrap and associated tools

apt install -y binfmt-support qemu qemu-user-static debootstrap

Run debootstrap

mkdir -p /tmp/sysroots
cd /tmp/sysroots
arches="amd64,x86_64-linux-gnu arm64,aarch64-linux-gnu mips,mips-linux-gnu mips64el,mips64el-linux-gnuabi64 ppc64el,powerpc64le-linux-gnu"
for arch in $arches; do IFS=","; set $arch; qemu-debootstrap --arch "$1" --variant=buildd stable "$2" http://deb.debian.org/debian; unset IFS; done

Fix symlinks

Debootstrap will create absolute symlinks, fix absolute symlinks to refer to the sysroot dir by changing them into relative symlinks.

for arch in $arches; do IFS=","; set $arch; find "$2" -type l -lname '/*' -exec sh -c 'file="$0"; dir=$(dirname "$file"); target=$(readlink "$0"); prefix=$(dirname "$dir" | sed 's@[^/]*@\.\.@g'); newtarget="$prefix$target"; ln -snf $newtarget $file' {} \; ; unset IFS; done

Host machine

Create directories

cd $HOME
arches="x86_64-linux-gnu aarch64-linux-gnu mips-linux-gnu mips64el-linux-gnuabi64 powerpc64le-linux-gnu"
for arch in $arches; do mkdir -p $HOME/cross/sysroot/$arch/{lib,usr/{include,lib}}; done

Copy sysroots

for arch in $arches; do for dir in /lib/ /usr/{include,lib}; do rsync -a ubuntu.local:/tmp/sysroots/$arch/$dir/ $HOME/cross/sysroot/$arch$dir; done; done

Debootstrap machine (again)

Cleanup

Still as root:

rm -rf /tmp/sysroots

See also