dbginfo.sh: dash compatible copy sequence

rewrite the copy of dbginfo.sh for dash compatibility

Reviewed-by: Mike Storzer <MSTORZER@de.ibm.com>
Reviewed-by: Mario Held <mario.held@de.ibm.com>
Signed-off-by: Joern Siglen <siglen@de.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ Release history for s390-tools (MIT version)
   Changes of existing tools:
 
   Bug Fixes:
+  - dbginfo.sh: dash compatible copy sequence
 
 * __v2.31.0 (2024-02-02)__
 

scripts/dbginfo.sh

@@ -15,7 +15,7 @@ export LC_ALL
 ########################################
 # Global used variables
 readonly SCRIPTNAME="${0##*/}" # general name of this script
-readonly STARTDIR="$(pwd)" # save calling directory
+readonly FULLPATHSCRIPT="$(readlink -f "${0}")"
 #
 readonly DATETIME="$(date +%Y-%m-%d-%H-%M-%S 2>/dev/null)"
 readonly DOCKER=$(if type docker >/dev/null 2>&1; then echo "YES"; else echo "NO"; fi)
@@ -1420,9 +1420,8 @@ environment_setup() {
 create_package() {
 	local rc_tar
 	pr_syslog_stdout ${step_num} "Finalizing: Creating archive with collected data"
-	# get a copy of the script used - enabled for relative path calls
-	cd "${STARTDIR}"
-	cp -p "${BASH_SOURCE[0]}" "${WORKPATH}"
+	# get a copy of the script used
+	cp -p "${FULLPATHSCRIPT}" "${WORKPATH}"
 	# create the archive
 	cd "${WORKDIR_BASE}"
 	touch "${WORKARCHIVE}"