[PATCH] ci: Check for necessary Debian packages when running build-many-glibcs.py

[Lukasz Majewski]

The build-many-glibc.py can be run on a 'vanila' Debian distribution
(as for example in docker container), which don't have by default
installed some packages (like flex).

This causes build break at late stage of the full build;
../src/scripts/build-many-glibcs.py . checkout --replace-sources &&
../src/scripts/build-many-glibcs.py . host-libraries &&
../src/scripts/build-many-glibcs.py . compilers &&
../src/scripts/build-many-glibcs.py . glibcs

To avoid such situation, this check has been added to inform user
early of required (and missing) Debian packages.

The same approach (with using the 'distro' python module) can be
applied to Fedora or Suse.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
 scripts/build-many-glibcs.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 6046048b75..b7aedf304f 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -54,6 +54,7 @@ import subprocess
 import sys
 import time
 import urllib.request
+import distro
 
 try:
     subprocess.run
@@ -1852,9 +1853,24 @@ def get_parser():
                         nargs='*')
     return parser
 
+def check_os_requirements():
+    if distro.id() == "debian" and distro.version() == "10":
+        # List 'Debian' specific packages requirements (different than
+        # vanila distro) to run this test without errors.
+        debian_requirements = ['flex', 'bison', 'dnsutils', 'texinfo']
+        import apt
+        debian_pkgs = apt.Cache()
+        for pkg in debian_requirements:
+            if not debian_pkgs[pkg].is_installed:
+                print(f"error: Debian package: '{pkg}' NOT installed!")
+                return False
+
+    return True
 
 def main(argv):
     """The main entry point."""
+    if not check_os_requirements():
+        sys.exit(0)
     parser = get_parser()
     opts = parser.parse_args(argv)
     topdir = os.path.abspath(opts.topdir)
-- 
2.20.1