From 52a301e0d95aa25aa9bbc0eefd1167458e3e0cab Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 13 Jan 2019 13:33:50 -0500
Subject: [PATCH] Improve missing-program error handling in make_ctags and
 make_etags.

If ctags (resp. etags) isn't installed, these scripts naturally fail,
but the error messages were less clear than one could wish.
It seems worth installing an explicit test to improve that.

Nikolay Shaplov, with suggestions from Michael Paquier and Andrew Dunstan

Discussion: https://postgr.es/m/2394207.ccz7JgCJsh@x200m
---
 src/tools/make_ctags | 3 +++
 src/tools/make_etags | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/src/tools/make_ctags b/src/tools/make_ctags
index 1609c07675..d8d18d1569 100755
--- a/src/tools/make_ctags
+++ b/src/tools/make_ctags
@@ -2,6 +2,9 @@
 
 # src/tools/make_ctags
 
+command -v ctags >/dev/null || \
+	{ echo "'ctags' program not found" 1>&2; exit 1; }
+
 trap "rm -f /tmp/$$" 0 1 2 3 15
 rm -f ./tags
 
diff --git a/src/tools/make_etags b/src/tools/make_etags
index 3ce96bc3ca..9288ef7b14 100755
--- a/src/tools/make_etags
+++ b/src/tools/make_etags
@@ -2,6 +2,9 @@
 
 # src/tools/make_etags
 
+command -v etags >/dev/null || \
+	{ echo "'etags' program not found" 1>&2; exit 1; }
+
 rm -f ./TAGS
 
 find `pwd`/ -type f -name '*.[chyl]' -print |