use ifup for bridge-less cable; allow UPPER scripting for image file root; allow...

[rrq/overlay-boot.git] / functions

diff --git a/functions b/functions
index 968c99db93603adddc6135312d61652dc187eea0..0b01df810cd0504583bb79261146a83edb9b472d 100644 (file)
--- a/functions
+++ b/functions
@@ -50,57 +50,86 @@ auto eth$i
 iface eth$i inet manual
 EOF
        BR="${C%=*}"
-       [ -z "$BR" ] || brctl addif $BR $IF
+       if [ -z "$BR" ] ; then
+           ip link set $IF
+           ifup $IF
+       else
+           brctl addif $BR $IF
+       fi
        i=$((i+1))
     done
 }
 
-REAPER=$(dirname $(realpath $0))/reaper
 # (name live system root work)
 # Set up an overlay fmr $name on $live, with a new tmpfs on its /run,
 # and "install" a "reaper" as the upcoming pid 1
 setup_overlay() {
-    local ROOT="$4"
-    local LIVE="$2"
+    local LIVE="$2" LOWER="$3" UPPER="$4" ROOT
 
     if grep -q "$1 $2" /proc/mounts ; then
        die "$1 is already mounted"
     fi
 
-    # setup $ROOT/run
-    mkdir -p "$ROOT/run"
-    mount -t tmpfs -osize=100M tmpfs "$ROOT/run"
-    mkdir -p "$ROOT/run/lock"
-    # setup $ROOT/dev
-    mkdir -p "$ROOT/dev"
-    mount -t tmpfs -osize=100M tmpfs "$ROOT/dev"
-    mknod -m 622 "$ROOT/dev/console" c 5 1
-    mknod -m 666 "$ROOT/dev/null" c 1 3
-    mknod -m 666 "$ROOT/dev/zero" c 1 5
-    mknod -m 666 "$ROOT/dev/ptmx" c 5 2
-    mknod -m 666 "$ROOT/dev/tty" c 5 0
-    mknod -m 444 "$ROOT/dev/random" c 1 8
-    mknod -m 444 "$ROOT/dev/urandom" c 1 9
-    chown root:tty "$ROOT/dev/console"
-    chown root:tty "$ROOT/dev/ptmx"
-    chown root:tty "$ROOT/dev/tty"
-    ln -sTf /proc/self/fd "$ROOT/dev/fd"
-    ln -sTf /proc/self/fd/0 "$ROOT/dev/stdin"
-    ln -sTf /proc/self/fd/1 "$ROOT/dev/stdout"
-    ln -sTf /proc/self/fd/2 "$ROOT/dev/stderr"
-    ln -sTf /proc/kcore "$ROOT/dev/core"
-    mkdir "$ROOT/dev/shm"
-    mkdir "$ROOT/dev/pts"
-    chmod 1777 "$ROOT/dev/shm"
+    if [ -f "${UPPER%% *}" ] ; then
+       if [ -x "${UPPER%% *}" ] ; then
+           echo "${UPPER%% *} appears to be executable" >&2
+           # Giving a program/script as UPPER= asks for running this
+           # first, to make a root filesystem available. The script takes
+           # ACTION "setup" and "teardown", and on "setup" it must tell
+           # where the ROOT is set up.
+           ROOT="$(env ACTION=setup $UPPER)"
+           if [ ! -d "$ROOT" ] ; then
+               # setup failed
+               die "root setup failed: $UPPER"
+           fi
+           UPPER="$ROOT"
+           ## Now falling down to "normal overlay" setup
+       else
+           die "${UPPER%% *} (root setup program/script) is not executable"
+       fi
+    fi
+
+    # LIVE is the same as LOWER then skip the overlay; just assume
+    # a proper chroot system exists at LIVE.
+    if [ "$LIVE" != "$LOWER" ] ; then
+       # setup $UPPER/run
+       mkdir -p "$UPPER/run"
+       mount -t tmpfs -osize=100M tmpfs "$UPPER/run"
+       mkdir -p "$UPPER/run/lock"
+       # setup $UPPER/dev
+       mkdir -p "$UPPER/dev"
+       mount -t tmpfs -osize=100M tmpfs "$UPPER/dev"
+       mknod -m 622 "$UPPER/dev/console" c 5 1
+       mknod -m 666 "$UPPER/dev/null" c 1 3
+       mknod -m 666 "$UPPER/dev/zero" c 1 5
+       mknod -m 666 "$UPPER/dev/ptmx" c 5 2
+       mknod -m 666 "$UPPER/dev/tty" c 5 0
+       mknod -m 444 "$UPPER/dev/random" c 1 8
+       mknod -m 444 "$UPPER/dev/urandom" c 1 9
+       chown root:tty "$UPPER/dev/console"
+       chown root:tty "$UPPER/dev/ptmx"
+       chown root:tty "$UPPER/dev/tty"
+       ln -sTf /proc/self/fd "$UPPER/dev/fd"
+       ln -sTf /proc/self/fd/0 "$UPPER/dev/stdin"
+       ln -sTf /proc/self/fd/1 "$UPPER/dev/stdout"
+       ln -sTf /proc/self/fd/2 "$UPPER/dev/stderr"
+       ln -sTf /proc/kcore "$UPPER/dev/core"
+       mkdir "$UPPER/dev/shm"
+       mkdir "$UPPER/dev/pts"
+       chmod 1777 "$UPPER/dev/shm"
 
-    if mount -t overlay -olowerdir=$3,upperdir=$4,workdir=$5 $1 $2 ; then
-       : # all good
-    else
-       umount -R "$ROOT/dev"
-       umount "$ROOT/run"
-       die "Cannot set up the overlay mount $2"
+       OLY="-olowerdir=$3,upperdir=$UPPER,workdir=$5"
+       if mount -t overlay "$OLY" $1 $2 ; then
+           : # all good
+       else
+           umount -R "$UPPER/dev"
+           umount "$UPPER/run"
+           die "Cannot set up the overlay mount $2"
+       fi
     fi
-    cp -p $REAPER $LIVE/.reaper
+
+    echo "Installing $OVERLAYDIR/reaper to $LIVE/.reaper"
+    cp -p $OVERLAYDIR/reaper $LIVE/.reaper
 }
 
 start_services() {