[PATCH] kbuild: deb-pkg: Explicitly define optional user-defined variables

[Nicolas Schier <nicolas@fjasle.eu>]

mkdebian supports some optional environment variables for controlling
the Debian package generation.  Declare those variables explicitly to
allow enabling of 'set -u' (error on unset variables).

Use of ': "${VAR:=}"' for variable assignment is POSIX compatible [1].

[1]: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#colon

Signed-off-by: Nicolas Schier <nicolas@fjasle.eu>
---
 scripts/package/mkdebian | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index 070149c985fe..81e81906ad07 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -6,6 +6,18 @@
 
 set -e
 
+# Optional user-specified environment variables
+
+# Set target Debian architecture (skip auto-detection)
+: "${KBUILD_DEBARCH:=}"
+
+# Set target Debian distribution (skipping auto-detection)
+: "${KDEB_CHANGELOG_DIST:=}"
+
+# Overwrite the automatically determined package version.
+: "${KDEB_PKGVERSION:=}"
+
+
 is_enabled() {
 	grep -q "^$1=y" include/config/auto.conf
 }
-- 
2.39.2


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