From d78af6a84362d828756d6916b84812c0d9429b83 Mon Sep 17 00:00:00 2001
From: Luis Rascao <luis.rascao@gmail.com>
Date: Wed, 8 Aug 2018 00:51:49 +0100
Subject: Check for pipe write permission on start/attach
A common pitfall when starting up Erlang nodes is to
start them as root and then fail silently when switching
to another user, improve this by providing a helpful error
message when this happens.
---
priv/templates/extended_bin | 11 +++++++++++
1 file changed, 11 insertions(+)
(limited to 'priv')
diff --git a/priv/templates/extended_bin b/priv/templates/extended_bin
index 11a0abc..78f25e0 100755
--- a/priv/templates/extended_bin
+++ b/priv/templates/extended_bin
@@ -492,6 +492,11 @@ case "$1" in
test -z "$PIPE_BASE_DIR" || mkdir -m 1777 -p "$PIPE_BASE_DIR"
mkdir -p "$PIPE_DIR"
+ if [ ! -w "$PIPE_DIR" ]
+ then
+ echo "failed to start, user '$USER' does not have write privileges on '$PIPE_DIR', either delete it or run node as a different user"
+ exit 1
+ fi
relx_run_hooks "$PRE_START_HOOKS"
"$BINDIR/run_erl" -daemon "$PIPE_DIR" "$RUNNER_LOG_DIR" \
@@ -555,6 +560,12 @@ case "$1" in
exit 1
fi
+ if [ ! -w "$PIPE_DIR" ]
+ then
+ echo "failed to attach, user '$USER' does not have sufficient privileges on '$PIPE_DIR', please run node as a different user"
+ exit 1
+ fi
+
shift
exec "$BINDIR/to_erl" "$PIPE_DIR"
;;
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