From a8d844c83dd5116782e009d2ef160ca17ae70cb1 Mon Sep 17 00:00:00 2001
From: xumia <59720581+xumia@users.noreply.github.com>
Date: Tue, 8 Mar 2022 00:00:56 +0800
Subject: [PATCH] [build]: Fix marvell-armhf build hung issue (#10156)

The marvel-armhf build is hung, it does not exist after waiting for a long time.
It is caused by the process /etc/entropy.py which is started by the postinst script in target/debs/buster/sonic-platform-nokia-7215_1.0_armhf.deb

$ cat postinst
sh /usr/sbin/nokia-7215_plt_setup.sh
...

$ cat usr/sbin/nokia-7215_plt_setup.sh | tail

    python /etc/entropy.py &


$ cat etc/entropy.py
if path.exists("/proc/sys/kernel/random/entropy_avail"):
    while 1:
        while avail() < 2048:
            with open('/dev/urandom', 'rb') as urnd, open("/dev/random", mode='wb') as rnd:
                d = urnd.read(512)
                t = struct.pack('ii', 4 * len(d), len(d)) + d
                fcntl.ioctl(rnd, RNDADDENTROPY, t)
        time.sleep(30)

It is a workaround to fix the build issue, need to fix debian package, and revert the change.
---
 files/build_templates/sonic_debian_extension.j2 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/files/build_templates/sonic_debian_extension.j2 b/files/build_templates/sonic_debian_extension.j2
index 393fbc042d..0874c51056 100644
--- a/files/build_templates/sonic_debian_extension.j2
+++ b/files/build_templates/sonic_debian_extension.j2
@@ -637,6 +637,11 @@ clean_proc() {
 }
 trap_push clean_proc
 sudo mount proc /proc -t proc
+if [[ $CONFIGURED_ARCH == armhf ]]; then
+    # A workaround to fix the armhf build hung issue, caused by sonic-platform-nokia-7215_1.0_armhf.deb post installation script 
+    ps -eo pid,cmd | grep python | grep "/etc/entropy.py" | awk '{print $1}' | xargs sudo kill -9 2>/dev/null || true
+fi
+
 sudo mkdir $FILESYSTEM_ROOT/target
 sudo mount --bind target $FILESYSTEM_ROOT/target
 sudo chroot $FILESYSTEM_ROOT docker $SONIC_NATIVE_DOCKERD_FOR_DOCKERFS info