125 lines
4.5 KiB
Bash
Executable file
125 lines
4.5 KiB
Bash
Executable file
#!/bin/sh
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# Debootstrap a target system
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#
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# Copyright © 2021-2022 Guilhem Moulin <guilhem@debian.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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set -eu
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PATH="/usr/sbin:/usr/bin:/sbin:/bin"
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export PATH
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ESSENTIAL="/media/__essential__"
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TEMPDIR="$(mktemp --tmpdir --directory "debootstrap.XXXXXXXXXX")"
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trap "rm -rf -- \"$TEMPDIR\"" EXIT INT TERM
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sed -rn "/^Package:\\s*/I {s///;s/$/ install/p}" "$ESSENTIAL/Packages" >"$TEMPDIR/Packages.sel"
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install -m0644 /dev/null "/var/lib/dpkg/status"
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dpkg --update-avail "$ESSENTIAL/Packages"
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dpkg --set-selections <"$TEMPDIR/Packages.sel"
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mkdir -- "$TEMPDIR/dpkg"
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mkdir -- "$TEMPDIR/dpkg/files" "$TEMPDIR/dpkg/depends" "$TEMPDIR/dpkg/pre-depends"
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# extract metadata (package names, file names, Depends and Pre-Depends
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# for easier processing)
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for deb in "$ESSENTIAL"/*.deb; do
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pkg=$(dpkg-deb --show --showformat="\${Package}" "$deb")
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case "$pkg" in
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# special case: base-files Pre-Depends on awk but we only have mawk (or gawk)
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mawk|gawk) pkg="awk";;
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esac
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printf "%s\\n" "$pkg" >>"$TEMPDIR/dpkg/avail"
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printf "%s\\n" "$deb" >"$TEMPDIR/dpkg/files/$pkg"
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dpkg-deb --show --showformat="\${Pre-Depends}\\n" "$deb" >"$TEMPDIR/predeps"
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dpkg-deb --show --showformat="\${Depends}\\n" "$deb" >"$TEMPDIR/deps"
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sed -ri "s/,\\s*/\\n/g" -- "$TEMPDIR/predeps" "$TEMPDIR/deps"
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sed -i "s/[[:blank:]:].*//; /^[[:blank:]]*$/d" -- "$TEMPDIR/predeps" "$TEMPDIR/deps"
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mv -T -- "$TEMPDIR/predeps" "$TEMPDIR/dpkg/pre-depends/$pkg"
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mv -T -- "$TEMPDIR/deps" "$TEMPDIR/dpkg/depends/$pkg"
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done
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if [ -L /bin ] && [ -L /sbin ] && [ -L /lib ]; then
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# TODO remove this once Bookworm is released, assuming
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# init-system-helpers no longer has "Depends: usrmerge | usr-is-merged"
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sed -i "s/^usrmerge$/usr-is-merged/" -- "$TEMPDIR/dpkg/depends/init-system-helpers"
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fi
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# recursively append dependencies to $OUT; abort and return 1 if one of
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# the (recursive) dependency has an unsatisfied Pre-Depends
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resolve_deps() {
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local pkg="$1" dep
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while read -r dep; do
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if grep -Fxq -e "$dep" <"$TEMPDIR/dpkg/avail"; then
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# $pkg has an unsatisfied Pre-Depends, can't proceed further
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return 1
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fi
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done <"$TEMPDIR/dpkg/pre-depends/$pkg"
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while read -r dep; do
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if grep -Fxq -e "$dep" <"$TEMPDIR/dpkg/avail" && ! grep -Fxq -e "$dep" <"$OUT"; then # break cycles
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printf "%s\\n" "$dep" >>"$OUT"
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resolve_deps "$dep" || return $?
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fi
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done <"$TEMPDIR/dpkg/depends/$pkg"
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return 0
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}
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# dump to $OUT a list of packages that can be installed (only packages
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# without unsatisfied pre-dependencies, and typically packages that are
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# pre-dependencies of other packages) -- using `dpkg --predep-package`
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# would be convenient but it doesn't work with recursive dependencies,
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# cf. #539133
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can_install_next() {
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local pkg
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while read -r pkg; do
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printf "%s\\n" "$pkg" >"$OUT"
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if resolve_deps "$pkg"; then
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return 0
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fi
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done <"$TEMPDIR/dpkg/avail"
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echo "PANIC: No remaining dependencies are satisfiable!" >&2
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cat <"$TEMPDIR/dpkg/avail" >&2
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exit 1
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}
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# keep going until all available packages are installed
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OUT="$TEMPDIR/pkg.list"
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XARGS_IN="$TEMPDIR/deb.list"
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while [ -s "$TEMPDIR/dpkg/avail" ]; do
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can_install_next || exit 1
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echo -n ">>> Installing: " >&2
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paste -sd" " <"$OUT" >&2
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while read -r pkg; do
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cat "$TEMPDIR/dpkg/files/$pkg"
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done <"$OUT" >"$XARGS_IN"
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xargs -a"$XARGS_IN" -d"\\n" dpkg -i
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grep -Fx -vf "$OUT" <"$TEMPDIR/dpkg/avail" >"$TEMPDIR/dpkg/avail.new" || true
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mv -T -- "$TEMPDIR/dpkg/avail.new" "$TEMPDIR/dpkg/avail"
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done
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echo apt apt >/var/lib/dpkg/cmethopt
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echo "deb [trusted=yes] file:/media/dists /" >/etc/apt/sources.list
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cat >/etc/apt/apt.conf.d/99debootstrap <<-EOF
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Acquire::Languages "none";
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APT::Install-Recommends "false";
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APT::Install-Suggests "false";
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EOF
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apt-get -oAcquire::Languages="none" -oAPT::Sandbox::User="root" -qq update
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