termux-packages/scripts/build/termux_step_handle_buildarc...

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termux_step_handle_buildarch() {
[ "$TERMUX_ON_DEVICE_BUILD" = "true" ] && return
# If $TERMUX_PREFIX already exists, it may have been built for a different arch
local TERMUX_ARCH_FILE=/data/TERMUX_ARCH
if [ -f "${TERMUX_ARCH_FILE}" ]; then
local TERMUX_PREVIOUS_ARCH
TERMUX_PREVIOUS_ARCH=$(cat $TERMUX_ARCH_FILE)
if [ "$TERMUX_PREVIOUS_ARCH" != "$TERMUX_ARCH" ]; then
local TERMUX_DATA_BACKUPDIRS=$TERMUX_TOPDIR/_databackups
mkdir -p "$TERMUX_DATA_BACKUPDIRS"
local TERMUX_DATA_PREVIOUS_BACKUPDIR=$TERMUX_DATA_BACKUPDIRS/$TERMUX_PREVIOUS_ARCH
local TERMUX_DATA_CURRENT_BACKUPDIR=$TERMUX_DATA_BACKUPDIRS/$TERMUX_ARCH
# Save current /data (removing old backup if any)
if test -e "$TERMUX_DATA_PREVIOUS_BACKUPDIR"; then
termux_error_exit "Directory already exists"
fi
if [ -d /data/data ]; then
mv /data/data "$TERMUX_DATA_PREVIOUS_BACKUPDIR"
fi
# Restore new one (if any)
if [ -d "$TERMUX_DATA_CURRENT_BACKUPDIR" ]; then
mv "$TERMUX_DATA_CURRENT_BACKUPDIR" /data/data
fi
fi
fi
# Keep track of current arch we are building for.
echo "$TERMUX_ARCH" > $TERMUX_ARCH_FILE
}