From df3d04affac9ec8cddea62a140cf6f3216094d6f Mon Sep 17 00:00:00 2001
From: ng0 <ng0@n0.is>
Date: Mon, 16 Dec 2019 11:50:31 +0000
Subject: switch existence over to 'type', add shell check for type built-in
 support.

---
 sh/lib.sh/existence.sh | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'sh')

diff --git a/sh/lib.sh/existence.sh b/sh/lib.sh/existence.sh
index a888dee..cddc3d6 100644
--- a/sh/lib.sh/existence.sh
+++ b/sh/lib.sh/existence.sh
@@ -18,10 +18,18 @@
 #
 # SPDX-License-Identifier: 0BSD
 
-# there is a function used in curl to replicate which(1), but
-# it uses too many other tools. this one uses command and in
-# gnunet so far has no reports about failures.
+errmsg=''
+
+# Check if shell supports builtin 'type'.
+if test -z "$errmsg"; then
+    if ! (eval 'type type') >/dev/null 2>&1
+    then
+        errmsg='Shell does not support type builtin'
+        exit 1
+    fi
+fi
+
 existence()
 {
-    command -v "$1" >/dev/null 2>&1
+    type "$1" >/dev/null 2>&1
 }
-- 
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