split script in multiple files, reassembled through build.sh

src/libs/330_cpu_misc.sh

@@ -0,0 +1,24 @@
+# vim: set ts=4 sw=4 sts=4 et:
+# Search dmesg for a pattern, returning nothing if the buffer has been truncated
+# Args: $1=grep_pattern
+# Sets: ret_dmesg_grep_grepped
+# Returns: 0=found, 1=not found, 2=dmesg truncated
+dmesg_grep() {
+    ret_dmesg_grep_grepped=''
+    if ! dmesg 2>/dev/null | grep -qE -e '(^|\] )Linux version [0-9]' -e '^FreeBSD is a registered'; then
+        # dmesg truncated
+        return 2
+    fi
+    ret_dmesg_grep_grepped=$(dmesg 2>/dev/null | grep -E "$1" | head -n1)
+    # not found:
+    [ -z "$ret_dmesg_grep_grepped" ] && return 1
+    # found, output is in $ret_dmesg_grep_grepped
+    return 0
+}
+
+# Check whether the system is running CoreOS/Flatcar
+# Returns: 0 if CoreOS, 1 otherwise
+is_coreos() {
+    command -v coreos-install >/dev/null 2>&1 && command -v toolbox >/dev/null 2>&1 && return 0
+    return 1
+}