add git version to footer, fetch on server reboot

related to comments on #315

scipost_django/SciPost_v1/settings/base.py

@@ -35,6 +35,17 @@ with open(os.path.join(BASE_DIR, "secrets.json")) as f:
     secrets = json.load(f)
 
 
+def get_latest_commit_hash():
+    try:
+        ps = os.popen("git log -n 1 --pretty=format:%h").read()
+        return ps.strip()
+    except Exception:
+        return None
+
+
+COMMIT_HASH = get_latest_commit_hash()
+
+
 def get_secret(setting, secrets=secrets):
     """Get the secret variable or return explicit exception."""
     try:
@@ -338,6 +349,7 @@ TEMPLATES = [
                 "django.contrib.messages.context_processors.messages",
                 "scipost.context_processors.roles_processor",
                 "scipost.context_processors.domain_processor",
+                "scipost.context_processors.commit_hash_processor",
                 "journals.context_processors.publishing_years_processor",
                 "journals.context_processors.journals_processor",
                 "ontology.context_processors.ontology_processor",

scipost_django/scipost/context_processors.py

@@ -2,6 +2,7 @@ __copyright__ = "Copyright 2016-2018, Stichting SciPost (SciPost Foundation)"
 __license__ = "AGPL v3"
 
 
+from django.conf import settings
 from django.contrib.auth.models import Group
 
 from common.utils.models import get_current_domain
@@ -56,3 +57,10 @@ def domain_processor(request):
     Add the domain name to the context.
     """
     return {"DOMAIN_HOST": get_current_domain()}
+
+
+def commit_hash_processor(request):
+    """
+    Add the current commit hash to the context.
+    """
+    return {"COMMIT_HASH": settings.COMMIT_HASH}

scipost_django/scipost/templates/scipost/footer.html

@@ -47,7 +47,8 @@
         <ul class="list-inline text-center">
           <li class="list-inline-item">
             <a href="https://git.{{ DOMAIN_HOST }}" target="_blank" rel="noopener">
-              <span>{% include 'bi/git.html' %}</span>&nbsp;Git Repository</a>
+              <span>{% include 'bi/git.html' %}</span>&nbsp;Git Repository</a> 
+              <span class="ms-1">(server version <a class="text-info" href="https://git.{{ DOMAIN_HOST }}/scipost/SciPost/-/commit/{{COMMIT_HASH}}">{{ COMMIT_HASH }}</a>)</span>
           </li>
           <li class="list-inline-item">
             <a href="{% url 'scipost:feeds' %}" aria-label="RSS feeds">