test: correctly process multiline strings in $KERNEL_APPEND

Some tests (like TEST-02) set a multiline string to $KERNEL_APPEND
(which is a valid thing to do), unfortunately we'd use only the first
line of it and throw the rest away, e.g:

```
$ printf "%s" "$x"
hello

this is a multiline

kernel command line
$ read -ra out <<< "$x"
$ printf "%s" "${out[@]}"
hello
```

Let's use readarray/mapfile instead to avoid this:

```
$ readarray out <<< "$x"
$ printf "%s" "${out[@]}"
hello

this is a multiline

kernel command line

```
This commit is contained in:
Frantisek Sumsal 2022-08-19 16:30:24 +02:00 committed by Luca Boccassi
parent c06b6d46fd
commit bea9d62bdb

View File

@ -498,7 +498,7 @@ run_qemu() {
if [[ -n "${KERNEL_APPEND:=}" ]]; then
local user_kernel_append
read -ra user_kernel_append <<< "$KERNEL_APPEND"
readarray user_kernel_append <<< "$KERNEL_APPEND"
kernel_params+=("${user_kernel_append[@]}")
fi
@ -557,7 +557,7 @@ run_nspawn() {
if [[ -n "${KERNEL_APPEND:=}" ]]; then
local user_kernel_append
read -ra user_kernel_append <<< "$KERNEL_APPEND"
readarray user_kernel_append <<< "$KERNEL_APPEND"
kernel_params+=("${user_kernel_append[@]}")
fi