tests: make build-chunk-writes-log simpler

Process substitution is a little funky and bash variable substitution's
suffix stripping is hard to remember.

Instead write the list of sources to a temporary file and redirect that
to the while loop.

1 files changed, 7 insertions, 6 deletions

diff --git a/tests/build-chunk-writes-log.script b/tests/build-chunk-writes-log.script
index 5b4d90b0..6b44d3cd 100755
--- a/tests/build-chunk-writes-log.script
+++ b/tests/build-chunk-writes-log.script
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Test building a chunk.
 #
@@ -21,15 +21,16 @@ set -eu
 
 "$SRCDIR/scripts/test-morph" build test:chunk-repo farrokh hello.morph
 
+SOURCES="$DATADIR/cached-sources"
+find "$DATADIR/cache/artifacts" -name '*.chunk.*' |
+    sed 's|\.chunk\..*||' | sort -u >"$SOURCES"
+
 found=false
 # list of sources in cache is not piped because while loop changes variable
 while read source; do
     [ -e "$source".build-log ] || continue
     found=true
     break
-done < <(
-    for chunk in "$DATADIR/cache/artifacts/"*.chunk.*
-    do
-        echo "${chunk%%.chunk.*}"
-    done | sort -u)
+done <"$SOURCES"
 "$found"
+