fix: 'make exec-hash' script rewrite to python (#424)

Makefile

@@ -20,7 +20,7 @@ feed                 :; ./scripts/check-oracle-feed.sh $(pip)
 feed-lp              :; ./scripts/check-oracle-feed-lp.sh $(pip)
 wards                :; ./scripts/wards.sh $(target)
 time                 :; ./scripts/time.py date="$(date)" stamp="$(stamp)"
-exec-hash            :; ./scripts/hash-exec-copy.sh "$(if $(date),$(date),$(shell date +'%Y-%m-%d'))"
+exec-hash            :; ./scripts/hash-exec-copy.py date="$(date)"
 opt-cost             :; ./scripts/get-opt-relay-cost.sh $(spell)
 arb-cost             :; ./scripts/get-arb-relay-cost.sh $(spell)
 rates                :; ./scripts/rates.sh $(pct)

scripts/hash-exec-copy.py

@@ -0,0 +1,104 @@
+#! /usr/bin/env python3
+
+import argparse
+from datetime import datetime
+import requests
+import subprocess
+import locale
+
+INPUT_DATE_FORMAT="%Y-%m-%d"
+REPO_URL = "/makerdao/community"
+
+# Set locale to en_US.UTF-8 to ensure consistent formatting
+locale.setlocale(locale.LC_ALL, "en_US.UTF-8")
+
+def get_executive_by_title (exec_title):
+    base_git_api_url = f"https://api.github.com/repos{REPO_URL}/commits"
+
+    api_response = requests.get(
+        f"{base_git_api_url}?path=governance/votes/{exec_title}",
+        params = {'per_page': '1'}
+    )
+    api_response.raise_for_status()
+    commits = api_response.json()
+    if not commits:
+        raise ValueError(f"Executive copy not found: {exec_title}")
+
+    commit_hash = commits[0].get("sha", "")
+
+    # Get target exec copy content
+    exec_copy_response = requests.get(
+        f"https://raw.githubusercontent.com{REPO_URL}/{commit_hash}/governance/votes/{exec_title}"
+    )
+    exec_copy_response.raise_for_status()
+
+    # Get target exec copy content
+    executive_url = exec_copy_response.url
+
+    # Remove trailing whitespace as command substitution in shell script removes it and we want to keep the output consistent
+    # Example of shell script to create hash `cast keccak -- "$(wget 'PATH' -q -O - 2>/dev/null)"`
+    if exec_copy_response.text[-1] == '\n':
+        content = exec_copy_response.text[:-1]
+
+    return content, executive_url, commit_hash
+
+def get_content_hash (content):
+    try:
+        # Run the 'cast keccak' command with the content
+        keccak_result = subprocess.run(
+            ['cast', 'keccak', '--', content],  # Run the cast keccak command
+            stdout = subprocess.PIPE,  # Capture the output
+            stderr = subprocess.PIPE,  # Capture the errors
+            text = True,  # Return output as text, not bytes
+            check = True  # Raise an exception if the command fails
+        )
+        return keccak_result.stdout
+    except FileNotFoundError:
+        raise SystemExit("Error: The 'cast' command is not found. Ensure it's installed and in the PATH.")
+    except subprocess.CalledProcessError as e:
+        raise SystemExit(f"Command failed with error: {e.stderr}")
+
+def main():
+    # Parse positional arguments
+    parser = argparse.ArgumentParser()
+    parser.add_argument("date", help=f"Date to find executive copy for (format: {INPUT_DATE_FORMAT})")
+    date_string = parser.parse_args().date.replace("date=", "")
+
+    try:
+        date = datetime.strptime(date_string, INPUT_DATE_FORMAT)
+    except ValueError:
+        raise SystemExit(f"Invalid date format. Please use {INPUT_DATE_FORMAT}.")
+
+    # Find the executive doc for the given date
+    POSSIBLE_EXEC_TITLES = [
+        f"Executive%20vote%20-%20{date.strftime('%B %d, %Y')}.md",
+        f"Executive%20Vote%20-%20{date.strftime('%B %d, %Y')}.md",
+        # Remove leading 0 in day (e.g. 01 -> 1)
+        # There is no case that year is 0-padded
+        f"Executive%20vote%20-%20{date.strftime('%B %d, %Y').replace(' 0', ' ')}.md",
+        f"Executive%20Vote%20-%20{date.strftime('%B %d, %Y').replace(' 0', ' ')}.md"
+    ]
+    executive_content, executive_url, commit_hash = None, None, None
+    for exec_title in POSSIBLE_EXEC_TITLES:
+        try:
+            executive_content, executive_url, commit_hash = get_executive_by_title(exec_title)
+            break
+        except ValueError as e:
+            continue
+        except requests.exceptions.RequestException as e:
+            raise SystemExit(f"HTTP Request failed: {e}")
+
+    # Check if executive content was found else exit
+    if executive_content is None:
+        raise SystemExit("Error: Executive Doc not found")
+
+    # Hash target exec copy
+    exec_hash = get_content_hash(executive_content)
+
+    # Output target exec copy hash
+    print(f"Community repo commit: {commit_hash}")
+    print(f"Raw GitHub URL: {executive_url}")
+    print(f"Exec copy hash: {exec_hash}")
+
+# Execute the main function
+main()

scripts/requirements.txt

@@ -0,0 +1 @@
+requests