Git precommit to check if a tex source can be compiled and if the pdf is up to date

gistfile1.txt

#!/bin/sh
#
# pre-commit hook.
# It runs xelatex, and if changes are detected, it fails.

# Reproducible latex builds
SOURCE_DATE_EPOCH=0 SOURCE_DATE_EPOCH_TEX_PRIMITIVES=1 xelatex tekton_knative.tex &> /dev/null

if [ ! $? -eq 0 ]; then
  echo tekton_knative.tex cannot be compiled
  tail -20 tekton_knative.log
  exit 1
fi

git diff --exit-code -- tekton_knative.pdf &> /dev/null
if [ ! $? -eq 0 ]; then
  echo tekton_knative.pdf is out of date. Please stage it and try again.
  exit 1
fi