build-linux.py docker container build fails due to unauthenticated packages

[PhracturedBlue]

When I tried to run: ./build-linux.py --target armv7-unknown-linux-gnueabihf on an x86_64 host, I got failure with the message:

image-gcc> WARNING: The following packages cannot be authenticated!
image-gcc>   libgdbm3 libmpfr4 libsigsegv2 gawk libisl10 libcloog-isl4 libmpc3 m4
image-gcc>   libtext-unidecode-perl libxml-namespacesupport-perl libxml-sax-base-perl ucf
image-gcc>   libxml-sax-perl texinfo xz-utils autoconf autotools-dev automake binutils
image-gcc>   libbison-dev bison cpp gcc g++ make libtimedate-perl libdpkg-perl dpkg-dev
image-gcc>   build-essential gcc-multilib libtool
image-gcc> E: There are problems and -y was used without --force-yes

I fixed this via:

diff --git a/cpython-unix/base.Dockerfile b/cpython-unix/base.Dockerfile
index 38f2c74..46b6f99 100644
--- a/cpython-unix/base.Dockerfile
+++ b/cpython-unix/base.Dockerfile
@@ -22,6 +22,7 @@ RUN for s in debian_jessie debian_jessie-updates debian-security_jessie/updates;
     done > /etc/apt/sources.list && \
     ( echo 'quiet "true";'; \
       echo 'APT::Get::Assume-Yes "true";'; \
+      echo 'APT::Get::force-yes "true";'; \
       echo 'APT::Install-Recommends "false";'; \
       echo 'Acquire::Check-Valid-Until "false";'; \
       echo 'Acquire::Retries "5";'; \
diff --git a/cpython-unix/build.cross.Dockerfile b/cpython-unix/build.cross.Dockerfile
index 4b95123..3b9468c 100644
--- a/cpython-unix/build.cross.Dockerfile
+++ b/cpython-unix/build.cross.Dockerfile
@@ -22,6 +22,7 @@ RUN for s in debian_stretch debian_stretch-updates debian-security_stretch/updat
     done > /etc/apt/sources.list && \
     ( echo 'quiet "true";'; \
       echo 'APT::Get::Assume-Yes "true";'; \
+      echo 'APT::Get::force-yes "true";'; \
       echo 'APT::Install-Recommends "false";'; \
       echo 'Acquire::Check-Valid-Until "false";'; \
       echo 'Acquire::Retries "5";'; \

[indygreg]

This is fixed on the main branch.