b3f72cd95e
udevd and a one-shot trigger run from schinit, 10-schos.conf no longer lists event0/event1, and the docs say what udev covers and what it does not. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao
346 lines
14 KiB
Shell
346 lines
14 KiB
Shell
#!/bin/sh
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# Build the apk-managed root: Alpine's minirootfs, with SchOS installed into
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# it as an apk package.
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#
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# tools/posix/mkaroot.sh SYSROOT OUTDIR APK_STATIC MINIROOTFS KEYDIR VERSION \
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# LOCK ALPINEDIR
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#
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# SYSROOT the staged SchOS userland (sysroot/), what the ramdisk root is
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# OUTDIR gets root/ (the tree for mkschfs) and repo/ (the SchOS repository)
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# APK_STATIC Alpine's static apk, from ports/alpine
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# MINIROOTFS Alpine's minirootfs tarball, from ports/alpine
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# KEYDIR where the repository signing key lives; made on first use
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# VERSION schos-base's apk version, e.g. 0.1_git20261024-r0
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# LOCK ports/alpine/world.lock: the Alpine packages to install
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# ALPINEDIR where those are, already fetched and checked (dist/alpine)
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#
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# What comes out is a root apk can manage: `apk add` installs anything from
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# Alpine, and `apk upgrade` updates SchOS from its own repository, which is
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# copied into the root at /var/lib/schos/repo and listed after Alpine's.
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#
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# schos-base is the sysroot less what Alpine's own packages own. Those are:
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#
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# /bin/sh busybox-binsh. Alpine's package scripts are written for
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# ash; mksh stays, as /bin/mksh, and schinit's recovery
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# shell looks for it first because it is static.
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# /lib/ld-musl-* musl. Every SchOS program is static and does not use it.
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# /etc/passwd, /etc/group
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# alpine-baselayout-data. Root's shell becomes zsh below,
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# the one edit SchOS makes to them.
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# /etc/profile alpine-baselayout-data. SchOS's goes to profile.d.
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#
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# /etc/os-release and /etc/motd are SchOS's and taken over with `replaces`.
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# Alpine's programs replace SchOS's where both have one:
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#
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# zsh Alpine's, from world. SchOS keeps its zshrc and zshenv,
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# taken over with `replaces`.
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# pci.ids, usb.ids Alpine's hwdata-pci and hwdata-usb, from world; Xorg
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# depends on hwdata-pci and two owners of one file is an
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# error apk will not install past.
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# busybox's commands cat, sed, find and the rest: Alpine's package scripts
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# are written against busybox's, and toybox's same-named
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# links are left out. toybox keeps what busybox lacks.
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#
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# Runs as an ordinary user. apk's scripts need a chroot, so the install runs
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# with --no-scripts and this script makes the one change schos-base's
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# post-install would; on a running SchOS the script itself runs.
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set -eu
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[ $# -eq 8 ] || { echo "usage: $0 SYSROOT OUTDIR APK_STATIC MINIROOTFS KEYDIR VERSION LOCK ALPINEDIR" >&2; exit 2; }
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abs() { case "$1" in /*) echo "$1" ;; *) echo "$(pwd)/$1" ;; esac; }
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SYSROOT=$(abs "$1"); OUT=$(abs "$2"); APK=$(abs "$3")
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MINI=$(abs "$4"); KEYDIR=$(abs "$5"); VERSION=$6
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LOCK=$(abs "$7"); ADIR=$(abs "$8")
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KEY=$KEYDIR/schos-local.rsa
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ROOT=$OUT/root
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REPO=$OUT/repo/x86_64
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PKG=$OUT/pkg
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# --- the signing key ----------------------------------------------------------
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#
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# One per build tree, never committed: whoever builds SchOS signs their own
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# packages, and the root they build trusts exactly that key besides Alpine's.
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if [ ! -f "$KEY" ]; then
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mkdir -p "$KEYDIR"
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openssl genrsa -out "$KEY" 2048 2>/dev/null
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openssl rsa -in "$KEY" -pubout -out "$KEY.pub" 2>/dev/null
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echo "mkaroot: made repository key $KEY"
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fi
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rm -rf "$OUT"
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mkdir -p "$ROOT" "$REPO" "$PKG/root"
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# First, because what busybox provides is read from it.
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tar -xzf "$MINI" -C "$ROOT"
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# --- schos-base ---------------------------------------------------------------
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cp -a "$SYSROOT/." "$PKG/root/"
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P=$PKG/root
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mv "$P/bin/sh" "$P/bin/mksh"
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rm -f "$P"/lib/ld-musl-*.so.1 "$P/etc/passwd" "$P/etc/group"
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rm -rf "$P/bin/zsh" "$P/bin/zsh-5.9" "$P/bin/zsh.old" "$P/usr/share/zsh"
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# pci.ids and usb.ids are Alpine's hwdata-pci and hwdata-usb, in world.
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rm -rf "$P/usr/share/hwdata"
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# Every busybox link in the minirootfs, out of the package.
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(cd "$ROOT" && find bin sbin usr/bin usr/sbin -type l) | while read -r l; do
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case "$(readlink "$ROOT/$l")" in
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*/busybox) rm -f "$P/$l" ;;
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esac
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done
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# SchOS's profile without the three lines Alpine's already sets, and sets
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# better: PATH with sbin, HOME from passwd, TERM from the console job.
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mkdir -p "$P/etc/profile.d"
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grep -v '^export \(PATH\|HOME\|TERM\)=' "$P/etc/profile" > "$P/etc/profile.d/schos.sh"
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rm -f "$P/etc/profile"
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# How startx starts the X server for root: Alpine's xserverrc. (It used to add
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# -dumbSched, Xorg's switch for reading input on the main loop, because when SchOS
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# had no threads the server crashed on its way out the first time a client
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# disconnected, in pthread_join on a thread that was never made. SchOS has threads
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# now; X was run without the switch under QEMU -- clients connecting and
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# disconnecting, an xterm starting and exiting -- and it stays up.) The file is
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# root's own rather than /etc/X11/xinit/xserverrc, which belongs to the xinit
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# package.
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mkdir -p "$P/root"
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cat > "$P/root/.xserverrc" <<'XEOF'
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#!/bin/sh
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# The VT X runs on is the one startx was started from. startx works that out
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# only when `uname -s` says Linux, and SchOS's says SchIFT.
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vt=$(tty | sed -n 's|^/dev/tty\([0-9][0-9]*\)$|vt\1|p')
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exec /usr/bin/X -nolisten tcp $vt "$@"
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XEOF
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# What startx runs inside it: Window Maker, which world installs. Without this
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# xinit falls back to twm and an xterm, neither of which is in the image.
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cat > "$P/root/.xinitrc" <<'XEOF'
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#!/bin/sh
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exec wmaker
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XEOF
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# X's input devices are found, not named: udevd (etc/schinit/udevd.job) turns
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# the kernel's uevents into /run/udev data, and Xorg asks libudev for every
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# device with ID_INPUT set. That was a hand-written list of event0 and event1
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# while SchOS had no udev. The file is SchOS's, in xorg.conf.d, which no Alpine
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# package writes into; what is left here is the options the defaults do not
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# give, and the framebuffer driver.
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mkdir -p "$P/etc/X11/xorg.conf.d"
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cat > "$P/etc/X11/xorg.conf.d/10-schos.conf" <<'XEOF'
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Section "ServerFlags"
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# Ctrl+Alt+Backspace ends X.
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Option "DontZap" "false"
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EndSection
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Section "InputClass"
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Identifier "SchOS keyboards"
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MatchIsKeyboard "on"
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Option "XkbRules" "evdev"
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Option "XkbOptions" "terminate:ctrl_alt_bksp"
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EndSection
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Section "Device"
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Identifier "fb"
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Driver "fbdev"
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EndSection
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Section "Screen"
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Identifier "screen"
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Device "fb"
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EndSection
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Section "ServerLayout"
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Identifier "schos"
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Screen "screen"
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EndSection
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XEOF
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# bwrap, without the sandbox. glycin -- which loads every image gdk-pixbuf is
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# asked for, so every GTK icon -- runs its loaders under bubblewrap and has no
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# other way to start them. Real bwrap needs user and mount namespaces, which
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# SchOS does not have. This takes the same arguments, keeps what they say
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# about the environment and the directory, and runs the program as it is:
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# no isolation at all, and it says so in its name. It replaces bubblewrap's own
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# /usr/bin/bwrap, which glycin depends on and which cannot run here.
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mkdir -p "$P/usr/bin"
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cat > "$P/usr/bin/bwrap" <<'BEOF'
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#!/bin/sh
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# SchOS: bubblewrap's command line, with no sandbox behind it. SchOS has no
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# namespaces; what the options say about the environment and the working
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# directory is honoured, and everything about isolation is ignored.
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clear= envs=
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while [ $# -gt 0 ]; do
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case "$1" in
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--clearenv) clear=1; shift ;;
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--setenv) envs="$envs $2=$3"; shift 3 ;;
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--unsetenv) unset "$2"; shift 2 ;;
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--chdir) cd "$2" || exit 1; shift 2 ;;
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--bind|--bind-try|--ro-bind|--ro-bind-try|--dev-bind|--dev-bind-try|\
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--symlink|--bind-data|--ro-bind-data|--file|--chmod) shift 3 ;;
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--dev|--proc|--tmpfs|--dir|--mqueue|--remount-ro|--seccomp|--add-seccomp-fd|\
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--uid|--gid|--hostname|--cap-add|--cap-drop|--lock-file|--sync-fd|\
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--info-fd|--json-status-fd|--block-fd|--userns-block-fd|--perms|--size|\
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--argv0|--exec-label|--file-label|--userns|--userns2|--pidns) shift 2 ;;
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--unshare-*|--share-net|--die-with-parent|--new-session|--as-pid-1|\
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--disable-userns|--assert-userns-disabled) shift ;;
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--) shift; break ;;
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-*) echo "bwrap: $1: not understood (SchOS runs bwrap without a sandbox)" >&2
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exit 1 ;;
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*) break ;;
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esac
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done
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[ $# -gt 0 ] || { echo "bwrap: no command" >&2; exit 1; }
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# shellcheck disable=SC2086
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if [ -n "$clear" ]; then exec env -i PATH="$PATH" $envs "$@"; fi
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# shellcheck disable=SC2086
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[ -n "$envs" ] && exec env $envs "$@"
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exec "$@"
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BEOF
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chmod 755 "$P/usr/bin/bwrap"
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# ALSA's default device, through the OSS plugin to /dev/dsp. The plug in front
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# converts whatever a program plays to what every SchOS audio driver accepts:
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# 16-bit stereo at 48 kHz (AC'97 without variable rate plays nothing else, and
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# the plugin refuses a rate the device rounds by more than 1%).
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mkdir -p "$P/etc"
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cat > "$P/etc/asound.conf" <<'AEOF'
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# SchOS: ALSA plays through OSS's /dev/dsp (kernel/dev/audio.c).
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pcm.!default {
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type plug
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slave {
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pcm "dsp"
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format S16_LE
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channels 2
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rate 48000
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}
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}
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pcm.dsp {
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type oss
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device /dev/dsp
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}
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ctl.!default {
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type hw
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card 0
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}
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AEOF
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# Mount points and runtime directories are alpine-baselayout's; an empty
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# directory here only duplicates it.
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for d in dev proc sys run tmp srv; do
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rmdir "$P/$d" 2>/dev/null || true
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done
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cat > "$PKG/post-install" <<'EOF'
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#!/bin/sh
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# Root logs in to zsh, as on every SchOS; Alpine's passwd says /bin/sh.
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sed -i 's|^\(root:[^:]*:0:0:[^:]*:[^:]*:\)/bin/sh$|\1/bin/zsh|' /etc/passwd
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for s in /bin/zsh /bin/mksh; do
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grep -qx "$s" /etc/shells 2>/dev/null || echo "$s" >> /etc/shells
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done
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# The machine's own name, which Alpine's hosts leaves out. Without it xauth
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# cannot resolve "schos:0", and startx says "bad display name" four times.
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grep -qw schos /etc/hosts || printf '127.0.1.1\tschos\n' >> /etc/hosts
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exit 0
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EOF
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cp "$PKG/post-install" "$PKG/post-upgrade"
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"$APK" mkpkg \
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--info name:schos-base \
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--info "version:$VERSION" \
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--info arch:x86_64 \
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--info "description:SchOS: init, console, tools and configuration" \
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--info license:GPL-2.0-or-later \
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--info url:https://github.com/Nexoniarz/SchOS \
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--info origin:schos-base \
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--info "depends:alpine-baselayout busybox musl apk-tools zsh" \
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--info "replaces:alpine-release alpine-baselayout zsh bubblewrap" \
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--files "$P" \
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--script "post-install:$PKG/post-install" \
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--script "post-upgrade:$PKG/post-upgrade" \
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--sign-key "$KEY" \
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--output "$REPO/schos-base-$VERSION.apk"
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"$APK" --keys-dir "$KEYDIR" mkndx --sign-key "$KEY" \
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--output "$REPO/APKINDEX.tar.gz" "$REPO"/*.apk
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# --- the root -----------------------------------------------------------------
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cp "$KEY.pub" "$ROOT/etc/apk/keys/"
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# world.lock's packages, by file: no index and no network. apk still checks
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# each one's signature against Alpine's keys in the root.
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FILES=$(grep -v '^#' "$LOCK" | while read -r f sum repo; do echo "$ADIR/$f"; done)
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# shellcheck disable=SC2086
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"$APK" --root "$ROOT" --repositories-file /dev/null --repository "$OUT/repo" \
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--no-network --no-scripts --no-chown --no-cache add $FILES schos-base
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# What world asked for, by name rather than by file, so a later `apk upgrade`
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# on the running system follows Alpine rather than these exact versions.
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sed 's/#.*//' "$(dirname "$LOCK")/world" | tr -s ' \t' '\n' | grep . |
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while read -r w; do grep -qx "$w" "$ROOT/etc/apk/world" || echo "$w" >> "$ROOT/etc/apk/world"; done
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# Installing by file pins each one to its exact checksum ("zsh><Q1..."); none
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# of them should stay pinned, and the dependencies among them need no entry.
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sed -i '/></d' "$ROOT/etc/apk/world"
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# The post-install above, done by hand because --no-scripts skipped it.
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ROOT_PI=$ROOT sh -c '
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sed -i "s|^\(root:[^:]*:0:0:[^:]*:[^:]*:\)/bin/sh$|\1/bin/zsh|" "$ROOT_PI/etc/passwd"
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for s in /bin/zsh /bin/mksh; do
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grep -qx "$s" "$ROOT_PI/etc/shells" 2>/dev/null || echo "$s" >> "$ROOT_PI/etc/shells"
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done
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grep -qw schos "$ROOT_PI/etc/hosts" || printf "127.0.1.1\tschos\n" >> "$ROOT_PI/etc/hosts"'
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# The triggers --no-scripts skipped, and they are not optional: they build the
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# caches half the desktop reads. Without shared-mime-info's, GLib cannot tell a
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# PNG from anything else, so gdk-pixbuf -- which hands images to glycin by MIME
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# type -- refused every icon and NetSurf died on its first toolbar button.
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# Likewise gdk-pixbuf's loader list, GLib's compiled schemas and GIO modules,
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# GTK's input methods, the font caches and busybox's applet links.
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#
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# They run in the root as /, which is what bubblewrap is for: no chroot, so no
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# root needed. apk names each script by the hex form of the checksum the
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# triggers database keys in base64, and passes the paths it watches as
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# arguments, globs expanded.
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if command -v bwrap >/dev/null 2>&1; then
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TRIG=$(mktemp -d)
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tar -xzf "$ROOT/lib/apk/db/scripts.tar.gz" -C "$TRIG" --wildcards '*.trigger' 2>/dev/null || true
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mkdir -p "$ROOT/tmp"
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for t in "$TRIG"/*.trigger; do
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[ -e "$t" ] || continue
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hex=${t##*.X1}; hex=${hex%.trigger}
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q=Q1$(python3 -c 'import base64,sys; print(base64.b64encode(bytes.fromhex(sys.argv[1])).decode())' "$hex")
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paths=$(grep "^$q " "$ROOT/lib/apk/db/triggers" | cut -d' ' -f2-)
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cp "$t" "$ROOT/tmp/apk-trigger"
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# --clearenv: the host's environment is not the root's. A Nix shell
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# exports GDK_PIXBUF_MODULE_FILE, and the loader cache went there.
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bwrap --bind "$ROOT" / --dev /dev --proc /proc --clearenv \
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--setenv PATH /usr/sbin:/usr/bin:/sbin:/bin --setenv HOME /root \
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/bin/sh -c 'a=; for g in '"$paths"'; do for p in $g; do [ -e "$p" ] && a="$a $p"; done; done
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exec /bin/sh /tmp/apk-trigger $a' \
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|| echo "mkaroot: trigger $(basename "$t") failed" >&2
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rm -f "$ROOT/tmp/apk-trigger"
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done
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rm -rf "$TRIG"
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else
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echo "mkaroot: no bwrap -- triggers not run; image and MIME caches are missing" >&2
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fi
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# The shared scratch directories, world-writable and sticky as baselayout
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# means them. apk running as an ordinary user on the build host lands them as
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# 0755, and with the kernel reporting real modes that is what tmux and every
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# other program checking /tmp would see.
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chmod 1777 "$ROOT/tmp" "$ROOT/var/tmp"
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# The repository goes in too, so the installed system can reinstall and
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# upgrade schos-base, and Alpine's are listed for everything else.
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mkdir -p "$ROOT/var/lib/schos"
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cp -a "$OUT/repo" "$ROOT/var/lib/schos/repo"
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{
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cat "$ROOT/etc/apk/repositories"
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echo "/var/lib/schos/repo"
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} > "$ROOT/etc/apk/repositories.new"
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mv "$ROOT/etc/apk/repositories.new" "$ROOT/etc/apk/repositories"
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echo "mkaroot: $ROOT ($(du -sh "$ROOT" | cut -f1)), schos-base $VERSION"
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