From 8b059e57a63917ee427147e9b0a2951fb728e99d Mon Sep 17 00:00:00 2001
From: Robert Fratto <robertfratto@gmail.com>
Date: Thu, 22 Jul 2021 11:16:53 -0400
Subject: [PATCH] deb package: add grafana-agent user to adm and
 systemd-journal groups

Closes #737
---
 packaging/deb/control/postinst | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/packaging/deb/control/postinst b/packaging/deb/control/postinst
index d29e8077ca1e..7390fe52e623 100644
--- a/packaging/deb/control/postinst
+++ b/packaging/deb/control/postinst
@@ -14,7 +14,15 @@ case "$1" in
             groupadd -r "$GRAFANA_AGENT_GROUP"
         fi
         if ! getent passwd "$GRAFANA_AGENT_USER" > /dev/null 2>&1 ; then
-            useradd -m -r -g grafana-agent -d /var/lib/grafana-agent -s /sbin/nologin -c "grafana-agent user" grafana-agent
+            useradd -m -r -g "$GRAFANA_AGENT_GROUP" -d /var/lib/grafana-agent -s /sbin/nologin -c "grafana-agent user" "$GRAFANA_AGENT_USER"
+        fi
+
+        # Add grafana agent user to groups used for reading logs.
+        if ! getent group adm > /dev/null 2>&1 ; then
+            usermod -a -G adm "$GRAFANA_AGENT_USER"
+        fi
+        if ! getent group systemd-journal > /dev/null 2>&1 ; then
+            usermod -a -G systemd-journal "$GRAFANA_AGENT_USER"
         fi
 
         chmod 640 /etc/grafana-agent.yaml