[kvm-unit-tests GIT PULL 17/26] scripts: Implement multiline strings for extra_params

[Nico Boehr <nrb@linux.ibm.com>]

From: Nina Schoetterl-Glausch <nsg@linux.ibm.com>

Implement a rudimentary form only.
extra_params can get long when passing a lot of arguments to qemu.
Multiline strings help with readability of the .cfg file.
Multiline strings begin and end with """, which must occur on separate
lines.

For example:
extra_params = """-cpu max,ctop=on -smp cpus=1,cores=16,maxcpus=128 \
-append '-drawers 2 -books 2 -sockets 2 -cores 16' \
-device max-s390x-cpu,core-id=31,drawer-id=0,book-id=0,socket-id=0"""

The command string built with extra_params is eval'ed by the runtime
script, so the newlines need to be escaped with \.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Link: https://lore.kernel.org/r/20231030160349.458764-10-nsg@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 scripts/common.bash  | 16 ++++++++++++++++
 scripts/runtime.bash |  4 ++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/scripts/common.bash b/scripts/common.bash
index 7b983f7..b9413d6 100644
--- a/scripts/common.bash
+++ b/scripts/common.bash
@@ -36,6 +36,22 @@ function for_each_unittest()
 			kernel=$TEST_DIR/${BASH_REMATCH[1]}
 		elif [[ $line =~ ^smp\ *=\ *(.*)$ ]]; then
 			smp=${BASH_REMATCH[1]}
+		elif [[ $line =~ ^extra_params\ *=\ *'"""'(.*)$ ]]; then
+			opts=${BASH_REMATCH[1]}$'\n'
+			while read -r -u $fd; do
+				#escape backslash newline, but not double backslash
+				if [[ $opts =~ [^\\]*(\\*)$'\n'$ ]]; then
+					if (( ${#BASH_REMATCH[1]} % 2 == 1 )); then
+						opts=${opts%\\$'\n'}
+					fi
+				fi
+				if [[ "$REPLY" =~ ^(.*)'"""'[:blank:]*$ ]]; then
+					opts+=${BASH_REMATCH[1]}
+					break
+				else
+					opts+=$REPLY$'\n'
+				fi
+			done
 		elif [[ $line =~ ^extra_params\ *=\ *(.*)$ ]]; then
 			opts=${BASH_REMATCH[1]}
 		elif [[ $line =~ ^groups\ *=\ *(.*)$ ]]; then
diff --git a/scripts/runtime.bash b/scripts/runtime.bash
index ada8ffd..fc156f2 100644
--- a/scripts/runtime.bash
+++ b/scripts/runtime.bash
@@ -15,7 +15,7 @@ extract_summary()
 # We assume that QEMU is going to work if it tried to load the kernel
 premature_failure()
 {
-    local log="$(eval $(get_cmdline _NO_FILE_4Uhere_) 2>&1)"
+    local log="$(eval "$(get_cmdline _NO_FILE_4Uhere_)" 2>&1)"
 
     echo "$log" | grep "_NO_FILE_4Uhere_" |
         grep -q -e "could not \(load\|open\) kernel" -e "error loading" &&
@@ -168,7 +168,7 @@ function run()
     # extra_params in the config file may contain backticks that need to be
     # expanded, so use eval to start qemu.  Use "> >(foo)" instead of a pipe to
     # preserve the exit status.
-    summary=$(eval $cmdline 2> >(RUNTIME_log_stderr $testname) \
+    summary=$(eval "$cmdline" 2> >(RUNTIME_log_stderr $testname) \
                              > >(tee >(RUNTIME_log_stdout $testname $kernel) | extract_summary))
     ret=$?
     [ "$KUT_STANDALONE" != "yes" ] && echo > >(RUNTIME_log_stdout $testname $kernel)
-- 
2.41.0