2020-08-15 22:50:46 +00:00
|
|
|
#!/bin/sh
|
2021-02-04 16:40:35 +00:00
|
|
|
#
|
|
|
|
|
# mmdebstrap does have a --merged-usr option but only as a no-op for
|
|
|
|
|
# debootstrap compatibility
|
|
|
|
|
#
|
|
|
|
|
# Using this hook script, you can emulate what debootstrap does to set up
|
|
|
|
|
# merged /usr via directory symlinks, even using the exact same shell function
|
2021-09-03 10:04:40 +00:00
|
|
|
# that debootstrap uses by running mmdebstrap with:
|
|
|
|
|
#
|
|
|
|
|
# --setup-hook=/usr/share/mmdebstrap/hooks/merged-usr/setup00.sh
|
|
|
|
|
#
|
|
|
|
|
# Alternatively, you can setup merged-/usr by installing the usrmerge package:
|
|
|
|
|
#
|
|
|
|
|
# --include=usrmerge
|
2021-02-04 16:40:35 +00:00
|
|
|
#
|
|
|
|
|
# mmdebstrap will not include this functionality via a --merged-usr option
|
|
|
|
|
# because there are many reasons against implementing merged-/usr that way:
|
|
|
|
|
#
|
|
|
|
|
# https://wiki.debian.org/Teams/Dpkg/MergedUsr
|
|
|
|
|
# https://wiki.debian.org/Teams/Dpkg/FAQ#Q:_Does_dpkg_support_merged-.2Fusr-via-aliased-dirs.3F
|
|
|
|
|
# https://lists.debian.org/20190219044924.GB21901@gaara.hadrons.org
|
|
|
|
|
# https://lists.debian.org/YAkLOMIocggdprSQ@thunder.hadrons.org
|
|
|
|
|
# https://lists.debian.org/20181223030614.GA8788@gaara.hadrons.org
|
|
|
|
|
#
|
|
|
|
|
# In addition, the merged-/usr-via-aliased-dirs approach violates an important
|
|
|
|
|
# principle of component based software engineering one of the core design
|
|
|
|
|
# ideas/goals of mmdebstrap: All the information to create a chroot of a Debian
|
|
|
|
|
# based distribution should be included in its packages and their metadata.
|
|
|
|
|
# Using directory symlinks as used by debootstrap contradicts this principle.
|
|
|
|
|
# The information whether a distribution uses this approach to merged-/usr or
|
|
|
|
|
# not is not anymore contained in its packages but in a tool from the outside.
|
|
|
|
|
#
|
2021-09-03 10:04:40 +00:00
|
|
|
# Example real world problem: I'm using debbisect to bisect Debian unstable
|
|
|
|
|
# between 2015 and today. For which snapshot.d.o timestamp should a merged-/usr
|
|
|
|
|
# chroot be created and for which ones not?
|
|
|
|
|
#
|
2021-02-04 16:40:35 +00:00
|
|
|
# The problem is not the idea of merged-/usr but the problem is the way how it
|
|
|
|
|
# got implemented in debootstrap via directory symlinks. That way of rolling
|
|
|
|
|
# out merged-/usr is bad from the dpkg point-of-view and completely opposite of
|
|
|
|
|
# the vision with which in mind I wrote mmdebstrap.
|
2020-08-15 22:50:46 +00:00
|
|
|
|
|
|
|
|
set -exu
|
|
|
|
|
|
2020-08-25 14:03:23 +00:00
|
|
|
TARGET="$1"
|
2020-08-15 22:50:46 +00:00
|
|
|
|
2020-08-25 14:03:23 +00:00
|
|
|
if [ -e "$TARGET/var/lib/dpkg/arch" ]; then
|
|
|
|
|
ARCH=$(head -1 "$TARGET/var/lib/dpkg/arch")
|
|
|
|
|
else
|
|
|
|
|
ARCH=$(dpkg --print-architecture)
|
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
if [ -e /usr/share/debootstrap/functions ]; then
|
|
|
|
|
. /usr/share/debootstrap/functions
|
|
|
|
|
doing_variant () { [ $1 != "buildd" ]; }
|
|
|
|
|
MERGED_USR="yes"
|
2020-12-01 23:43:45 +00:00
|
|
|
# until https://salsa.debian.org/installer-team/debootstrap/-/merge_requests/48 gets merged
|
|
|
|
|
link_dir=""
|
2020-08-25 14:03:23 +00:00
|
|
|
setup_merged_usr
|
|
|
|
|
else
|
2020-09-06 08:29:06 +00:00
|
|
|
link_dir=""
|
2020-08-25 14:03:23 +00:00
|
|
|
case $ARCH in
|
|
|
|
|
hurd-*) exit 0;;
|
|
|
|
|
amd64) link_dir="lib32 lib64 libx32" ;;
|
|
|
|
|
i386) link_dir="lib64 libx32" ;;
|
|
|
|
|
mips|mipsel) link_dir="lib32 lib64" ;;
|
|
|
|
|
mips64*|mipsn32*) link_dir="lib32 lib64 libo32" ;;
|
|
|
|
|
powerpc) link_dir="lib64" ;;
|
|
|
|
|
ppc64) link_dir="lib32 lib64" ;;
|
|
|
|
|
ppc64el) link_dir="lib64" ;;
|
|
|
|
|
s390x) link_dir="lib32" ;;
|
|
|
|
|
sparc) link_dir="lib64" ;;
|
|
|
|
|
sparc64) link_dir="lib32 lib64" ;;
|
|
|
|
|
x32) link_dir="lib32 lib64 libx32" ;;
|
|
|
|
|
esac
|
|
|
|
|
link_dir="bin sbin lib $link_dir"
|
|
|
|
|
|
|
|
|
|
for dir in $link_dir; do
|
|
|
|
|
ln -s usr/"$dir" "$TARGET/$dir"
|
|
|
|
|
mkdir -p "$TARGET/usr/$dir"
|
|
|
|
|
done
|
|
|
|
|
fi
|
