[RFC PATCH 2/3] tests: add python3-venv dependency

[John Snow]

Several debian-based tests need the python3-venv dependency as a
consequence of Debian debundling the "ensurepip" module normally
included with Python.

As this series stands right now, in most cases, Debian requires EITHER:

(A) setuptools and pip, or
(B) ensurepip

It's quite likely most developer workstations running Debian or a
Debian-based distro already have all of these packages. venv creation
will actually be quite a bit faster by installing pip and setuptools,
but for the purposes of this patch I am only adding the strict minimum
necessary.

(For that reason, I chose ensurepip to make sure that as we continue
tweaking and developing the mkvenv script, we can count on Debian having
a fully functional Python installation; but for the sake of this series
it is an arbitrary choice here.)

In one case, even though we already have pip and setuptools, we still
need ensurepip because the version of these tools that shipped with
Debian are known to be broken and do not function correctly inside of a
venv. Using ensurepip bypasses the bug. (This is only for Debian 10,
which we technically no longer support. Even so, I wanted to prove it's
possible to support our oldest platforms.)

Signed-off-by: John Snow <jsnow@redhat.com>
---
 tests/docker/dockerfiles/debian-all-test-cross.docker | 3 ++-
 tests/docker/dockerfiles/debian-hexagon-cross.docker  | 3 ++-
 tests/docker/dockerfiles/debian-riscv64-cross.docker  | 3 ++-
 tests/docker/dockerfiles/debian-tricore-cross.docker  | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/tests/docker/dockerfiles/debian-all-test-cross.docker 
b/tests/docker/dockerfiles/debian-all-test-cross.docker
index 981e9bdc7b0..f9f401544a0 100644
--- a/tests/docker/dockerfiles/debian-all-test-cross.docker
+++ b/tests/docker/dockerfiles/debian-all-test-cross.docker
@@ -57,7 +57,8 @@ RUN DEBIAN_FRONTEND=noninteractive eatmydata \
         gcc-sh4-linux-gnu \
         libc6-dev-sh4-cross \
         gcc-sparc64-linux-gnu \
-        libc6-dev-sparc64-cross
+        libc6-dev-sparc64-cross \
+        python3-venv
 
 ENV QEMU_CONFIGURE_OPTS --disable-system --disable-docs --disable-tools
 ENV DEF_TARGET_LIST 
aarch64-linux-user,alpha-linux-user,arm-linux-user,hppa-linux-user,i386-linux-user,m68k-linux-user,mips-linux-user,mips64-linux-user,mips64el-linux-user,mipsel-linux-user,ppc-linux-user,ppc64-linux-user,ppc64le-linux-user,riscv64-linux-user,s390x-linux-user,sh4-linux-user,sparc64-linux-user
diff --git a/tests/docker/dockerfiles/debian-hexagon-cross.docker 
b/tests/docker/dockerfiles/debian-hexagon-cross.docker
index 5308ccb8fe9..344eec900b0 100644
--- a/tests/docker/dockerfiles/debian-hexagon-cross.docker
+++ b/tests/docker/dockerfiles/debian-hexagon-cross.docker
@@ -20,7 +20,8 @@ RUN apt-get update && \
         bison \
         flex \
         git \
-        ninja-build && \
+        ninja-build \
+        python3-venv && \
 # Install QEMU build deps for use in CI
     DEBIAN_FRONTEND=noninteractive eatmydata \
     apt build-dep -yy --arch-only qemu
diff --git a/tests/docker/dockerfiles/debian-riscv64-cross.docker 
b/tests/docker/dockerfiles/debian-riscv64-cross.docker
index 803afb95734..081404e0141 100644
--- a/tests/docker/dockerfiles/debian-riscv64-cross.docker
+++ b/tests/docker/dockerfiles/debian-riscv64-cross.docker
@@ -28,7 +28,8 @@ RUN DEBIAN_FRONTEND=noninteractive eatmydata apt install -yy \
     libglib2.0-dev \
     ninja-build \
     pkg-config \
-    python3
+    python3 \
+    python3-venv
 
 # Add ports and riscv64 architecture
 RUN echo "deb http://ftp.ports.debian.org/debian-ports/ sid main" >> 
/etc/apt/sources.list
diff --git a/tests/docker/dockerfiles/debian-tricore-cross.docker 
b/tests/docker/dockerfiles/debian-tricore-cross.docker
index cfd2faf9a80..269bfa8d423 100644
--- a/tests/docker/dockerfiles/debian-tricore-cross.docker
+++ b/tests/docker/dockerfiles/debian-tricore-cross.docker
@@ -33,7 +33,8 @@ RUN apt update && \
        pkgconf \
        python3-pip \
        python3-setuptools \
-       python3-wheel
+       python3-wheel \
+       python3-venv
 
 RUN curl -#SL 
https://github.com/bkoppelmann/package_940/releases/download/tricore-toolchain-9.40/tricore-toolchain-9.4.0.tar.gz
 \
     | tar -xzC /usr/local/
-- 
2.39.2