Add update script

Signed-off-by: Rémy Jacquin <remy@remyj.fr>

update.py

@@ -0,0 +1,109 @@
+#!/usr/bin/env python3
+# coding: utf-8
+
+'''
+Check Hugo new releases from Hugo GitHub repo and update image automaticaly
+
+Usage: update.py API_token project_uri
+'''
+
+import base64
+import requests
+import re
+import sys
+from urllib.parse import quote
+
+GITLAB_URL = "https://gitlab.com/api/v4"
+COMMIT_MESSAGE = "Update Hugo to version %s"
+
+def compare_versions(version1, version2):
+    def normalize(v):
+        return [int(x) for x in re.sub(r'(\.0+)*$','', v).split(".")]
+    return normalize(version1) >= normalize(version2)
+
+if len(sys.argv) != 3:
+    print('Usage: update.py API_token project_uri')
+    exit(1)
+
+# Get vars from script arguments
+GITLAB_TOKEN = sys.argv[1]
+GITLAB_PROJECT = quote(sys.argv[2], safe='')
+
+# Get latest release
+rrelease = requests.get('https://api.github.com/repos/gohugoio/hugo/releases/latest')
+if rrelease.status_code != 200:
+    print('Failed to get Hugo latest release from GitHub')
+    exit(1)
+
+release = rrelease.json()
+print('Last Hugo version is %s'%release['name'])
+
+# Get repository tags
+rtags = requests.get('%s/projects/%s/repository/tags'%(GITLAB_URL, GITLAB_PROJECT))
+if rtags.status_code != 200:
+    print('Failed to get tags from GitLab project')
+    exit(1)
+
+# If a higher version is present in the GitLab repository, do nothing
+for tag in rtags.json():
+    if tag['release'] is None:
+        continue
+    if compare_versions(tag['release']['tag_name'], release['name'][1:]):
+        print('Already up to date, nothing to do')
+        exit(0)
+print('No tag is higher or equal to Hugo version.\nUpdating...')
+
+# Find release archive checksum from GitHub
+for asset in release['assets']:
+    if re.search('checksums.txt', asset['name']):
+        rchecksums = requests.get(asset['browser_download_url'])
+        if rchecksums.status_code != 200:
+            print('Failed to get checksums file from GitHub')
+            exit(1)
+        for line in rchecksums.text.split("\n"):
+            if 'hugo_%s_Linux-64bit.tar.gz'%(release['name'][1:]) in line:
+                checksum = line[:64]
+                break
+
+# Get Dockerfile from repository
+rdockerfile = requests.get('%s/projects/%s/repository/files/Dockerfile/raw?ref=registry'%(GITLAB_URL, GITLAB_PROJECT))
+if rdockerfile.status_code != 200:
+    print('Failed to get Dockerfile from %s:'%sys.argv[1])
+    print(rdockerfile.json())
+    exit(1)
+dockerfile = rdockerfile.text.split("\n")
+
+# Replace env variables
+for index, line in enumerate(dockerfile):
+    if "ENV HUGO_VERSION" in line:
+        dockerfile[index] = "ENV HUGO_VERSION %s"%release['name'][1:]
+    if "ENV HUGO_SHA" in line:
+        dockerfile[index] = "ENV HUGO_SHA %s"%checksum
+
+# Update Dockerfile on repository
+rupdate = requests.put('%s/projects/%s/repository/files/Dockerfile?branch=registry&author_name=Update%%20script&content=%s&commit_message=%s&encoding=base64'%(
+    GITLAB_URL,
+    GITLAB_PROJECT,
+    quote(base64.b64encode("\n".join(dockerfile).encode()), safe=''),
+    quote(COMMIT_MESSAGE%(release['name'][1:]), safe='')
+), headers={'Private-Token': GITLAB_TOKEN})
+if rupdate.status_code != 200:
+    print("Failed to update Dockerfile:")
+    print(rupdate.json())
+    exit(1)
+print('Dockerfile was updated to version %s'%release['name'][1:])
+
+# Create new tag
+rtag = requests.post('%s/projects/%s/repository/tags?tag_name=%s&ref=registry&message=%s&release_description=%s'%(
+    GITLAB_URL,
+    GITLAB_PROJECT,
+    release['name'][1:],
+    quote(COMMIT_MESSAGE%(release['name'][1:]), safe=''),
+    quote(release['body'], safe='')
+), headers={'Private-Token': GITLAB_TOKEN})
+if rtag.status_code != 201:
+    print('Failed to create tag:')
+    print(rtag.json())
+    exit(0)
+print('Tag %s created'%release['name'][1:])
+print('Done !')