[RFC PATCH 1/2] Set TOPDIR_PATH and generate its sha256sum at run time

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.com>

Commit 42d27579a9d0 ("guestfs: enhance ssh config choice") added a
uniquifier to the name of the ssh config to avoid multiple kdevops
runs clobbering each other's ssh config entries. It uses the TOPDIR
pathname set in the current .config to benefit from the nice
convenience of generating an Ansible extra_var using "output yaml".

However, if the same user generates all her .configs (that will be
run by other users under automation) while in the same directory
(say, if they are different branches in the same git repository),
the TOPDIR pathname and thus the sha256sum of that pathname will be
exactly the same in all of those .config files, allowing the path
names of the ephemeral ssh configs to collide.

The TOPDIR and its checksum need to be generated not by "make
menuconfig" but rather by "make" in order that .config files (as
saved in defconfigs/) can be truly portable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 Kconfig                    | 15 ---------------
 Makefile                   |  4 ++++
 scripts/gen-hosts.Makefile |  1 +
 scripts/ssh.Makefile       |  4 ++--
 4 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/Kconfig b/Kconfig
index 3f2bc8cf019a..948befbce4de 100644
--- a/Kconfig
+++ b/Kconfig
@@ -5,21 +5,6 @@
 
 mainmenu "$(PROJECT) $(PROJECTRELEASE)"
 
-config TOPDIR_PATH
-	string
-	output yaml
-	default $(shell, echo $TOPDIR_PATH)
-
-config TOPDIR_PATH_HAS_SHA256SUM
-	bool
-	output yaml
-	default y
-
-config TOPDIR_PATH_SHA256SUM
-	string
-	output yaml
-	default $(shell, ./scripts/compute_sha256sum.sh $(TOPDIR_PATH))
-
 config HAVE_KDEVOPS_CUSTOM_DEFAULTS
 	bool
 	default n
diff --git a/Makefile b/Makefile
index 8755577e4d85..b6fdbe67fc07 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,8 @@ export KDEVOPS_NODES :=
 export PYTHONUNBUFFERED=1
 export TOPDIR=./
 export TOPDIR_PATH = $(shell readlink -f $(TOPDIR))
+export TOPDIR_PATH_HAS_SHA256SUM=y
+export TOPDIR_PATH_SHA256SUM = $(shell, ./scripts/compute_sha256sum.sh $(TOPDIR_PATH))
 include scripts/refs.Makefile
 
 KDEVOPS_NODES_ROLE_TEMPLATE_DIR :=		$(KDEVOPS_PLAYBOOKS_DIR)/roles/gen_nodes/templates
@@ -82,6 +84,8 @@ INCLUDES = -I include/
 CFLAGS += $(INCLUDES)
 
 ANSIBLE_EXTRA_ARGS += kdevops_version='$(PROJECTRELEASE)'
+ANSIBLE_EXTRA_ARGS += topdir_path_has_sha256sum='$(TOPDIR_PATH_HAS_SHA256SUM)'
+ANSIBLE_EXTRA_ARGS += topdir_path_sha256sum='$(TOPDIR_PATH_SHA256SUM)'
 
 export KDEVOPS_HOSTS_TEMPLATE := hosts.j2
 
diff --git a/scripts/gen-hosts.Makefile b/scripts/gen-hosts.Makefile
index 0d1e0cd77c2e..c809b1da18e5 100644
--- a/scripts/gen-hosts.Makefile
+++ b/scripts/gen-hosts.Makefile
@@ -3,6 +3,7 @@
 KDEVOPS_PLAYBOOKS_DIR_FULL_PATH=$(TOPDIR_PATH)/$(KDEVOPS_PLAYBOOKS_DIR)
 KDEVOPS_HOSTS_TEMPLATE_DIR=$(KDEVOPS_PLAYBOOKS_DIR_FULL_PATH)/roles/gen_hosts/templates
 
+GENHOSTS_EXTRA_ARGS += topdir_path='$(TOPDIR_PATH)'
 GENHOSTS_EXTRA_ARGS += kdevops_playbooks_dir='$(KDEVOPS_PLAYBOOKS_DIR)'
 
 # Relative path so that ansible can work with it
diff --git a/scripts/ssh.Makefile b/scripts/ssh.Makefile
index d18a03e094ee..d2a583f45da2 100644
--- a/scripts/ssh.Makefile
+++ b/scripts/ssh.Makefile
@@ -10,8 +10,8 @@ ifeq (y,$(CONFIG_KDEVOPS_SSH_CONFIG_UPDATE))
 SSH_CONFIG_FILE:=$(subst ",,$(CONFIG_KDEVOPS_SSH_CONFIG))
 ANSIBLE_EXTRA_ARGS += sshconfig=$(shell realpath $(SSH_CONFIG_FILE))
 
-ifeq (y,$(CONFIG_TOPDIR_PATH_HAS_SHA256SUM))
-SSH_CONFIG_SUFFIX:=$(CONFIG_TOPDIR_PATH_SHA256SUM)
+ifeq (y,$(TOPDIR_PATH_HAS_SHA256SUM))
+SSH_CONFIG_SUFFIX:=$(TOPDIR_PATH_SHA256SUM)
 else
 SSH_CONFIG_SUFFIX:=$(CONFIG_KDEVOPS_HOST_PREFIX)
 endif
-- 
2.51.0