[OE-core] [PATCH 2/2] package_[deb|ipk]: improve multiprocess logic when creating deb/ipk packages

[leonardo.sandoval.gonzalez at linux.intel.com]

From: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.com>

Current implementation does not handle possible exceptions coming from child
processes, the latter responsible for creating packages. With the aim to have more
control, use pipes to communicate exceptions and stop package creation in case
of failure.

Helps to debug [YOCTO #12012].

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.com>
---
 meta/classes/package_deb.bbclass | 36 +++++++++++++++++++++++++++++++++---
 meta/classes/package_ipk.bbclass | 36 +++++++++++++++++++++++++++++++++---
 2 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/meta/classes/package_deb.bbclass b/meta/classes/package_deb.bbclass
index 30605344f4..5d297939b6 100644
--- a/meta/classes/package_deb.bbclass
+++ b/meta/classes/package_deb.bbclass
@@ -41,7 +41,29 @@ def debian_arch_map(arch, tune):
     return arch
 
 python do_package_deb () {
-    from multiprocessing import Process
+
+    import multiprocessing
+    import traceback
+
+    class DebianWritePkgProcess(multiprocessing.Process):
+        def __init__(self, *args, **kwargs):
+            multiprocessing.Process.__init__(self, *args, **kwargs)
+            self._pconn, self._cconn = multiprocessing.Pipe()
+            self._exception = None
+
+        def run(self):
+            try:
+                multiprocessing.Process.run(self)
+                self._cconn.send(None)
+            except Exception as e:
+                tb = traceback.format_exc()
+                self._cconn.send((e, tb))
+
+        @property
+        def exception(self):
+            if self._pconn.poll():
+                self._exception = self._pconn.recv()
+            return self._exception
 
     oldcwd = os.getcwd()
 
@@ -56,20 +78,28 @@ python do_package_deb () {
 
     max_process = int(d.getVar("BB_NUMBER_THREADS") or os.cpu_count() or 1)
     launched = []
+    error = None
     pkgs = packages.split()
-    while pkgs:
+    while not error and pkgs:
         if len(launched) < max_process:
-            p = Process(target=deb_write_pkg, args=(pkgs.pop(), d))
+            p = DebianWritePkgProcess(target=deb_write_pkg, args=(pkgs.pop(), d))
             p.start()
             launched.append(p)
         for q in launched:
             # The finished processes are joined when calling is_alive()
             if not q.is_alive():
                 launched.remove(q)
+            if q.exception:
+                error, traceback = q.exception
+                break
+
     for p in launched:
         p.join()
 
     os.chdir(oldcwd)
+
+    if error:
+        raise error
 }
 do_package_deb[vardeps] += "deb_write_pkg"
 do_package_deb[vardepsexclude] = "BB_NUMBER_THREADS"
diff --git a/meta/classes/package_ipk.bbclass b/meta/classes/package_ipk.bbclass
index ec90996184..8439cda6dd 100644
--- a/meta/classes/package_ipk.bbclass
+++ b/meta/classes/package_ipk.bbclass
@@ -17,7 +17,29 @@ OPKG_ARGS += "${@['', '--add-exclude ' + ' --add-exclude '.join((d.getVar('PACKA
 OPKGLIBDIR = "${localstatedir}/lib"
 
 python do_package_ipk () {
-    from multiprocessing import Process
+    import multiprocessing
+    import traceback
+
+    class IPKWritePkgProcess(multiprocessing.Process):
+        def __init__(self, *args, **kwargs):
+            multiprocessing.Process.__init__(self, *args, **kwargs)
+            self._pconn, self._cconn = multiprocessing.Pipe()
+            self._exception = None
+
+        def run(self):
+            try:
+                multiprocessing.Process.run(self)
+                self._cconn.send(None)
+            except Exception as e:
+                tb = traceback.format_exc()
+                self._cconn.send((e, tb))
+
+        @property
+        def exception(self):
+            if self._pconn.poll():
+                self._exception = self._pconn.recv()
+            return self._exception
+
 
     oldcwd = os.getcwd()
 
@@ -41,20 +63,28 @@ python do_package_ipk () {
 
     max_process = int(d.getVar("BB_NUMBER_THREADS") or os.cpu_count() or 1)
     launched = []
+    error = None
     pkgs = packages.split()
-    while pkgs:
+    while not error and pkgs:
         if len(launched) < max_process:
-            p = Process(target=ipk_write_pkg, args=(pkgs.pop(), d))
+            p = IPKWritePkgProcess(target=ipk_write_pkg, args=(pkgs.pop(), d))
             p.start()
             launched.append(p)
         for q in launched:
             # The finished processes are joined when calling is_alive()
             if not q.is_alive():
                 launched.remove(q)
+            if q.exception:
+                error, traceback = q.exception
+                break
+
     for p in launched:
         p.join()
 
     os.chdir(oldcwd)
+
+    if error:
+        raise error
 }
 do_package_ipk[vardeps] += "ipk_write_pkg"
 do_package_ipk[vardepsexclude] = "BB_NUMBER_THREADS"
-- 
2.12.3