[OE-core] [PATCH] package_deb: allow dpkg-deb to be customized via DPKG_BUILDCMD

[Tim Blechmann]

the command line to invoke `dpkg-deb` is hardcoded. there are certain use
cases where we want to tweak how debian packages are compiled: e.g. the
default uses xz compression, which is rather CPU intensive. for local
builds one might want to pass `-Zgzip -z1` to favor speed over compression
ratio.

we therefore introduce a `DPKG_BUILDCMD` variable which allows downstream
code to customize how dpkg-deb is executed

Signed-off-by: Tim Blechmann <tim at klingt.org>
---
 meta/classes/package_deb.bbclass | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/classes/package_deb.bbclass b/meta/classes/package_deb.bbclass
index 6f81591653..790b26aef2 100644
--- a/meta/classes/package_deb.bbclass
+++ b/meta/classes/package_deb.bbclass
@@ -6,6 +6,8 @@ inherit package
 
 IMAGE_PKGTYPE ?= "deb"
 
+DPKG_BUILDCMD ??= "dpkg-deb"
+
 DPKG_ARCH ?= "${@debian_arch_map(d.getVar('TARGET_ARCH'), d.getVar('TUNE_FEATURES'))}"
 DPKG_ARCH[vardepvalue] = "${DPKG_ARCH}"
 
@@ -269,7 +271,8 @@ def deb_write_pkg(pkg, d):
             conffiles.close()
 
         os.chdir(basedir)
-        subprocess.check_output("PATH=\"%s\" dpkg-deb -b %s %s" % (localdata.getVar("PATH"), root, pkgoutdir),
+        subprocess.check_output("PATH=\"%s\" %s -b %s %s" % (localdata.getVar("PATH"), localdata.getVar("DPKG_BUILDCMD"),
+                                                             root, pkgoutdir),
                                 stderr=subprocess.STDOUT,
                                 shell=True)
 
-- 
2.18.0