From 60483a2628ced4dff66e9f5140fa4b8be47ed6cf Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Wed, 20 Oct 2021 12:29:23 +0200
Subject: Reject geometry file if wavelength isn't specified

---
 libcrystfel/src/datatemplate.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'libcrystfel/src')

diff --git a/libcrystfel/src/datatemplate.c b/libcrystfel/src/datatemplate.c
index cea963ec..37bb623c 100644
--- a/libcrystfel/src/datatemplate.c
+++ b/libcrystfel/src/datatemplate.c
@@ -1246,6 +1246,12 @@ DataTemplate *data_template_new_from_string(const char *string_in)
 		reject = 1;
 	}
 
+	if ( dt->wavelength_from == NULL ) {
+		ERROR("Geometry file must specify the wavelength "
+		      "(value or location)\n");
+		reject = 1;
+	}
+
 	for ( i=0; i<dt->n_panels; i++ ) {
 
 		int j;
-- 
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