utils/dependency_cross_matcher.py: Add dependency cross matching

* Add a script to check for mismatches in dependencies in the
  repository.

Mismatches are two different versions of the same dependency.

Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>

Author: tgonzalezorlandoarm

utils/dependency_cross_matcher.py

@@ -0,0 +1,75 @@
+import argparse
+import re
+import os
+import subprocess
+import sys
+
+
+def run_cargo_tree(path):
+    cmd = 'cargo tree --all-features -d'
+    prev_dir = os.getcwd()
+    os.chdir(os.path.join(path))
+    return subprocess.check_output(cmd, shell=True).decode()
+
+
+def run_deps_mismatcher(lines):
+    pat = re.compile('([a-zA-Z]\S+)\s(v\S+)')
+    deps = dict()
+    for line in lines.split('\n'):
+        m = pat.search(line)
+        if m is not None:
+            if m.group(1) in deps.keys():
+                if m.group(2) not in deps[m.group(1)]:
+                    deps[m.group(1)].append(m.group(2))
+            else:
+                deps[m.group(1)] = [m.group(2)]
+    return deps
+
+
+def get_deps_with_more_than_1v(deps_and_versions):
+    new_dict = dict()
+    for dep_name, versions in deps_and_versions.items():
+        if len(versions) > 1:
+            new_dict[dep_name] = versions
+    return new_dict
+
+
+def print_deps(deps_and_versions):
+    for dep_name, versions in deps_and_versions.items():
+        print(f"{dep_name:<25} {versions}")
+
+
+def main(argv=[], prog_name=''):
+    parser = argparse.ArgumentParser(prog='DependencyCrossmatcher',
+                                     description='Checks the version mismatches for dependencies '
+                                                 'in Cargo based repositories')
+    parser.add_argument('--deps_dir',
+                        required=True,
+                        help='Existing directory that contains the Cargo.toml for analyzing'
+                             'dependencies')
+    args = parser.parse_args()
+
+    mismatches = run_deps_mismatcher(run_cargo_tree(args.deps_dir))
+    print_deps(mismatches)
+
+    mismatches = get_deps_with_more_than_1v(mismatches)
+
+    print('---------------------mistmatches----------------------\n\n')
+    print_deps(mismatches)
+
+    exceptions = {
+        'base64': ['v0.13.1', 'v0.21.4'],
+        'bitflags': ['v1.3.2', 'v2.4.1'],
+        'nom': ['v5.1.3', 'v7.1.3'],
+        'syn': ['v1.0.109', 'v2.0.38'],
+        'yasna': ['v0.4.0', 'v0.5.2'],
+    }
+
+    if exceptions != mismatches:
+        return 1
+
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:], sys.argv[0]))