From cc85c34d483539acbf4f249b6add7c20de29f39d Mon Sep 17 00:00:00 2001
From: Michael Santos <michael.santos@gmail.com>
Date: Fri, 15 Jun 2018 15:27:40 -0400
Subject: Start script (#635)

* templates/bin: replace process with erlexec

Similar to templates/extended_bin, use "exec" to avoid leaving an extra
shell process running.

* template/{bin,extended_bin}: set program name

Set the program name to the script name in process lists using the same
method as escripts. The program name can be overriden by setting the
ESCRIPT_NAME environment variable:

    # before
    msantos  10428  9554 49 10:33 pts/25   00:00:01 /usr/local/lib/erlang/erts-9.2/bin/beam.smp -Bd -- ...

    # after
    msantos  10054  9554 32 10:33 pts/25   00:00:01 /home/msantos/src/erlang/appname/_build/default/rel/appname/bin/appname -Bd -- ...

    # ESCRIPT_NAME="foo"
    msantos  11254  9554 32 10:35 pts/25   00:00:01 foo -Bd -- ...
---
 priv/templates/bin          | 3 ++-
 priv/templates/extended_bin | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/priv/templates/bin b/priv/templates/bin
index 523b88d..e2a54be 100755
--- a/priv/templates/bin
+++ b/priv/templates/bin
@@ -13,6 +13,7 @@ REL_VSN="{{ rel_vsn }}"
 ERTS_VSN="{{ erts_vsn }}"
 REL_DIR="$RELEASE_ROOT_DIR/releases/$REL_VSN"
 ERL_OPTS="{{ erl_opts }}"
+export ESCRIPT_NAME="${ESCRIPT_NAME-$SCRIPT}"
 
 find_erts_dir() {
     __erts_dir="$RELEASE_ROOT_DIR/erts-$ERTS_VSN"
@@ -74,4 +75,4 @@ set -- "$ERL_OPTS"
 set -- "$@" -boot_var ERTS_LIB_DIR "$ERTS_LIB_DIR" -boot "$REL_DIR/$BOOTFILE" "$ARGS"
 
 # Boot the release
-$BINDIR/erlexec $@
+exec $BINDIR/erlexec $@
diff --git a/priv/templates/extended_bin b/priv/templates/extended_bin
index d044a38..11a0abc 100755
--- a/priv/templates/extended_bin
+++ b/priv/templates/extended_bin
@@ -38,6 +38,7 @@ CODE_LOADING_MODE="${CODE_LOADING_MODE:-embedded}"
 REL_DIR="$RELEASE_ROOT_DIR/releases/$REL_VSN"
 ERL_OPTS="{{ erl_opts }}"
 RUNNER_LOG_DIR="${RUNNER_LOG_DIR:-$RELEASE_ROOT_DIR/log}"
+export ESCRIPT_NAME="${ESCRIPT_NAME-$SCRIPT}"
 
 # start/stop/install/upgrade pre/post hooks
 PRE_START_HOOKS="{{{ pre_start_hooks }}}"
-- 
cgit v1.2.3