Add a small next_build script

This script queries for the number of build made with the latest
version in koji and change the release to either the number of
builds or do current_release+1 (for the situation where the current
release is higher than the number of builds made in koji).

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

next_build.py

@@ -0,0 +1,68 @@
+#!/usr/bin/python3
+
+import datetime
+import logging
+import os
+import subprocess
+import sys
+import textwrap
+
+import pygit2
+
+_log = logging.getLogger(__name__)
+
+
+def run_command(command, cwd=None):
+    """ Run the specified command in a specific working directory if one
+    is specified.
+    """
+    output = None
+    try:
+        output = subprocess.check_output(
+            command, cwd=cwd, stderr=subprocess.PIPE
+        )
+    except subprocess.CalledProcessError as e:
+        _log.error(
+            "Command `{}` return code: `{}`".format(
+                " ".join(command), e.returncode
+            )
+        )
+        _log.error("stdout:\n-------\n{}".format(e.stdout))
+        _log.error("stderr:\n-------\n{}".format(e.stderr))
+        raise Exception("Command failed to run")
+
+    return output
+
+
+def main(args):
+    """ Main method. """
+    package = args[0]
+    dist = args[1]
+
+    cmd = f"koji list-builds --package={package} --state=COMPLETE -r --quiet"
+    rows = run_command(cmd.split()).decode("utf-8")
+    builds = [row.strip().split()[0] for row in rows.split("\n") if row.strip()]
+    n_builds = 1
+    last_build = None
+    nv = None
+    for build in builds:
+        if dist in build:
+            if n_builds == 1:
+                last_build = build
+                nv = last_build.rsplit("-", 1)[0]
+            if build.startswith(nv):
+                n_builds += 1
+
+    print(f"Last build: {last_build}")
+    last_build = last_build.rsplit(f".{dist}", 1)[0]
+    rel = last_build.rsplit("-", 1)[-1]
+    try:
+        rel = int(rel)
+        n_builds = max([rel+1, n_builds])
+    except Exception:
+        pass
+    print(f"Next build: {nv}-{n_builds}.{dist}")
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])