[ptxdist] [PATCHi v2] rootfs: Fix handling of empty variables

[Sascha Hauer <s.hauer@pengutronix.de>]

$(PTXCONF_PROJECT_VENDOR) and $(PTXCONF_ROOTFS_ETC_HOSTNAME) can be
empty variables in which case bash answers with:

/bin/bash: command substitution: line 0: syntax error near unexpected token `newline'
/bin/bash: command substitution: line 0: `sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< '

Fix this warning by adding quotes to make the empty string explicit.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---

Changes since v1:
- use remove_quotes

 rules/rootfs.make | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/rules/rootfs.make b/rules/rootfs.make
index 419ca001e..1c1e5501c 100644
--- a/rules/rootfs.make
+++ b/rules/rootfs.make
@@ -217,12 +217,14 @@ ifdef PTXCONF_ROOTFS_ISSUE
 		$(call remove_quotes,$(PTXCONF_ROOTFS_ETC_HOSTNAME)))
 	@$(call install_replace_figlet, rootfs, /etc/issue, \
 		@FIGLET:VENDOR@, \
-		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< $(PTXCONF_PROJECT_VENDOR)`, \
-		etcissue)
+		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< \
+			"$(call remove_quotes,$(PTXCONF_PROJECT_VENDOR))"`, \
+			etcissue)
 	@$(call install_replace_figlet, rootfs, /etc/issue, \
 		@FIGLET:HOSTNAME@, \
-		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< $(PTXCONF_ROOTFS_ETC_HOSTNAME)`, \
-		etcissue)
+		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< \
+			"$(call remove_quotes,$(PTXCONF_ROOTFS_ETC_HOSTNAME))"`, \
+			etcissue)
 endif
 
 ifdef PTXCONF_ROOTFS_HOSTS
-- 
2.20.1


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