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af790692f5
This is needed on SELinux systems, so the labels (xattrs) are preserved. (From OE-Core rev: ab7e3caf3e29f2d8db55e2901e0a9b01061afd88) Signed-off-by: Chris PeBenito <Christopher.PeBenito@microsoft.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
1.3 KiB
Executable File
1.3 KiB
Executable File
#!/bin/sh
Perform a bind mount, copying existing files as we do so to ensure the
overlaid path has the necessary content.
if [ $# -lt 2 ]; then echo >&2 "Usage: $0 spec mountpoint [OPTIONS]" exit 1 fi
e.g. /var/volatile/lib
spec=$1
e.g. /var/lib
mountpoint=$2
if [ $# -gt 2 ]; then options=$3 else options= fi
[ -n "$options" ] && options=",$options"
mkdir -p "${spec%/*}"
if [ -d "$mountpoint" ]; then
if [ -d "$spec" ]; then
specdir_existed=yes
else
specdir_existed=no
mkdir "$spec"
fi
# Fast version of calculating `dirname ${spec}`/.`basename ${spec}`-work
overlay_workdir="${spec%/*}/.${spec##*/}-work"
mkdir "${overlay_workdir}"
# Try to mount using overlay, which is must faster than copying files.
# If that fails, fall back to slower copy.
if ! mount -t overlay overlay -olowerdir="$mountpoint",upperdir="$spec",workdir="$overlay_workdir" "$mountpoint" > /dev/null 2>&1; then
if [ "$specdir_existed" != "yes" ]; then
cp -aPR "$mountpoint"/. "$spec/"
fi
mount -o "bind$options" "$spec" "$mountpoint"
fi
elif [ -f "$mountpoint" ]; then if [ ! -f "$spec" ]; then cp -aP "$mountpoint" "$spec" fi
mount -o "bind$options" "$spec" "$mountpoint"
fi