tailscale/cmd/relaynode/debian/gen-changelog

#!/bin/sh
read junk pkgname <debian/control
read shortver <../../version/short.txt
git log --pretty='format:'"$pkgname"' (SHA:%H) unstable; urgency=low

  * %s
  
 -- %aN <%aE>  %aD
' . |
python -Sc '
import os, re, subprocess, sys

first = True
def Describe(g):
  global first
  if first:
    s = sys.argv[1]
    first = False
  else:
    sha = g.group(1)
    s = subprocess.check_output(["git", "describe", "--always", "--", sha]).strip().decode("utf-8")
  return re.sub(r"^\D*", "", s)

print(re.sub(r"SHA:([0-9a-f]+)", Describe, sys.stdin.read()))
' "$shortver"