Fixes #1611.

Adapted `Makefile.am` to create 'tss' user and group as well as all FAPI
directories manually as a fallback solution, in case systemd is not available on the
system, such as in Docker (by default).

Included requested changes.

Signed-off-by: Michael Eckel <michael.eckel@sit.fraunhofer.de>

Makefile.am

@@ -524,6 +524,36 @@ endif #DOXYMAN
 
 endif #FAPI
 
+### Helper Functions ###
+define make_parent_dir
+    if [ ! -d $(dir $1) ]; then mkdir -p $(dir $1); fi
+endef
+
+define make_tss_user_and_group
+    (id -g tss || groupadd -r tss) && \
+    (id -u tss || useradd -r -g tss tss)
+endef
+
+define make_tss_dir
+    ($(call make_parent_dir,$1))
+endef
+
+define set_tss_permissions
+    (chown -R tss:tss "$1") && \
+    (chmod -R 775 "$1")
+endef
+
+define make_fapi_dirs
+    ($(call make_tss_dir,$(DESTDIR)$(runstatedir)/tpm2-tss/eventlog/) || true) && \
+    ($(call make_tss_dir,$(DESTDIR)$(localstatedir)/lib/tpm2-tss/system/keystore/))
+endef
+
+define set_fapi_permissions
+    ($(call set_tss_permissions,$(DESTDIR)$(runstatedir)/tpm2-tss)
+    ($(call set_tss_permissions,$(DESTDIR)$(localstatedir)/lib/tpm2-tss)
+endef
+
+
 ### Man Pages
 man3_MANS = \
     man/man3/Tss2_Tcti_Device_Init.3 \
@@ -560,7 +590,8 @@ endif
 
 # Create tss user and FAPI directories directly after installation (vs. after a reboot)
 install-exec-hook:
-	systemd-sysusers && systemd-tmpfiles --create || true
+	(systemd-sysusers && systemd-tmpfiles --create) || \
+	($(call make_tss_user_and_group) && $(call make_fapi_dirs) && ($call set_fapi_permissions)) || true
 
 uninstall-hook:
 	cd $(DESTDIR)$(man3dir) && \
@@ -588,11 +619,6 @@ CLEANFILES += \
     $(man3_MANS) \
     $(man7_MANS)
 
-### Helper Functions ###
-define make_parent_dir
-    if [ ! -d $(dir $1) ]; then mkdir -p $(dir $1); fi
-endef
-
 # function to transform man .in files to man pages
 # $1: target
 # $2: .in file