letsencrypt-auto.diff

--- letsencrypt-auto.orig   2015-11-04 12:38:30.000000000 +0100
+++ letsencrypt-auto    2015-11-04 17:23:59.728223639 +0100
@@ -12,6 +12,8 @@
 VENV_NAME="letsencrypt"
 VENV_PATH=${VENV_PATH:-"$XDG_DATA_HOME/$VENV_NAME"}
 VENV_BIN=${VENV_PATH}/bin
+VENV_LASTUPDATE=${VENV_PATH}/.lastupdate
+VENV_UPDATEINTERVAL=86400   # 1 day

 if test "`id -u`" -ne "0" ; then
   SUDO=sudo
@@ -73,31 +75,45 @@
   fi
 fi

-printf "Updating letsencrypt and virtual environment dependencies..."
-if [ "$VERBOSE" = 1 ]  ; then
-  echo
-  $VENV_BIN/pip install -U setuptools
-  $VENV_BIN/pip install -U pip
-  $VENV_BIN/pip install -U letsencrypt letsencrypt-apache
-  # nginx is buggy / disabled for now, but upgrade it if the user has
-  # installed it manually
-  if $VENV_BIN/pip freeze | grep -q letsencrypt-nginx ; then
-    $VENV_BIN/pip install -U letsencrypt letsencrypt-nginx
-  fi
+# Find last time of env update (if any)
+if [ -e "${VENV_LASTUPDATE}" ]; then
+  VENV_LASTUPDATED=$(( `date +%s` - `stat -L --format %Y "${VENV_LASTUPDATE}"` ))
 else
-  $VENV_BIN/pip install -U setuptools > /dev/null
-  printf .
-  $VENV_BIN/pip install -U pip > /dev/null
-  printf .
-  # nginx is buggy / disabled for now...
-  $VENV_BIN/pip install -U letsencrypt > /dev/null
-  printf .
-  $VENV_BIN/pip install -U letsencrypt-apache > /dev/null
-  if $VENV_BIN/pip freeze | grep -q letsencrypt-nginx ; then
+  VENV_LASTUPDATED=${VENV_UPDATEINTERVAL}
+fi
+
+# Update letsencrypt and virtual environment dependencies if not done within
+# the last $VENV_UPDATEINTERVAL seconds (default: not more often than once per day)
+if [ ${VENV_LASTUPDATED} -lt ${VENV_UPDATEINTERVAL} ]; then
+  printf "Skipping update check. Remove '${VENV_LASTUPDATE}' to enforce."
+else
+  printf "Updating letsencrypt and virtual environment dependencies..."
+  if [ "$VERBOSE" = 1 ]  ; then
+    echo
+    $VENV_BIN/pip install -U setuptools
+    $VENV_BIN/pip install -U pip
+    $VENV_BIN/pip install -U letsencrypt letsencrypt-apache
+    # nginx is buggy / disabled for now, but upgrade it if the user has
+    # installed it manually
+    if $VENV_BIN/pip freeze | grep -q letsencrypt-nginx ; then
+      $VENV_BIN/pip install -U letsencrypt letsencrypt-nginx
+    fi
+  else
+    $VENV_BIN/pip install -U setuptools > /dev/null
+    printf .
+    $VENV_BIN/pip install -U pip > /dev/null
     printf .
-    $VENV_BIN/pip install -U letsencrypt-nginx > /dev/null
+    # nginx is buggy / disabled for now...
+    $VENV_BIN/pip install -U letsencrypt > /dev/null
+    printf .
+    $VENV_BIN/pip install -U letsencrypt-apache > /dev/null
+    if $VENV_BIN/pip freeze | grep -q letsencrypt-nginx ; then
+      printf .
+      $VENV_BIN/pip install -U letsencrypt-nginx > /dev/null
+    fi
+    echo
   fi
-  echo
+  touch ${VENV_LASTUPDATE}
 fi

 # Explain what's about to happen, for the benefit of those getting sudo