Replace components detect with declare -F

That's prepare for sharing component between
`all.sh` and faketime nightly build tests

Signed-off-by: Jerry Yu <[email protected]>

Author: yuhaoth

tests/scripts/all.sh

@@ -191,9 +191,12 @@ pre_initialize_variables () {
 
     # Gather the list of available components. These are the functions
     # defined in this script whose name starts with "component_".
-    # Parse the script with sed. This way we get the functions in the order
-    # they are defined.
-    ALL_COMPONENTS=$(sed -n 's/^ *component_\([0-9A-Z_a-z]*\) *().*/\1/p' <"$0")
+    # Parse the script with sed.
+    #
+    # This script is interpreted by `bash` and `declare -F` is supported,
+    # functions defined in other files can be detected with `declare -F`
+    ALL_COMPONENTS=$(declare -F | \
+        sed -n 's/^declare\ -f\ component_\([0-9A-Z_a-z]*\)$/\1/p')
 
     # For Linux platforms we run latest/earliest versions of clang and the
     # test_clang_opt function is only for FreeBSD. This condition removes