fix: compute git rev in Dockerfile

Author: costowell

Dockerfile

@@ -3,7 +3,7 @@ MAINTAINER Computer Science House <webmaster@csh.rit.edu>
 
 RUN mkdir /opt/selfservice
 
-ADD requirements.txt /opt/selfservice
+COPY requirements.txt /opt/selfservice
 
 WORKDIR /opt/selfservice
 
@@ -12,7 +12,8 @@ RUN apt-get -yq update && \
     pip install -r requirements.txt && \
     apt-get -yq clean all
 
-ADD . /opt/selfservice
+COPY . /opt/selfservice
+RUN git rev-parse --short HEAD > rev
 
 EXPOSE 8080
 

selfservice/__init__.py

@@ -34,11 +34,7 @@
     app.config.from_pyfile(os.path.join(os.getcwd(), "config.env.py"))
 
 # Get Git Revision
-version = (
-    subprocess.check_output(["git", "rev-parse", "--short", "HEAD"])
-    .decode("utf-8")
-    .rstrip()
-)
+version = open("rev", "r").read().rstrip()
 
 # Setup Sentry tracking
 sentry_sdk.init(