1 files changed, 16 insertions, 0 deletions
diff --git a/cache.sh b/cache.sh
new file mode 100755
index 0000000..c84fe71
--- /dev/null
+++ b/cache.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+set -o pipefail
+: "${CACHE_AGE:=300}"
+test -n "$CACHE_DIR" || exit 1
+cache="$CACHE_DIR/$(echo "$*" | base64)"
+if test -f "$cache"; then
+    now="$(date +%s)"
+    mod="$(stat -c %Y "$cache")"
+    if test $((mod + CACHE_AGE)) -gt "$now"; then
+        if ! test -s "$cache"; then
+            exit 1
+        fi
+        exec cat "$cache"
+    fi
+fi
+"$@" | tee "$cache"