From 1c7cf90afae80918b82d823af59484f84391814f Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Wed, 24 May 2017 15:57:34 +1200
Subject: Add dam(1df)

---
 bin/dam.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 bin/dam.sh

(limited to 'bin')

diff --git a/bin/dam.sh b/bin/dam.sh
new file mode 100644
index 00000000..03424515
--- /dev/null
+++ b/bin/dam.sh
@@ -0,0 +1,25 @@
+# Store up all input before emitting it unchanged as output
+self=dam
+
+# Create a temporary directory with name in $td, and handle POSIX-ish traps to
+# remove it when the script exits.
+td=
+cleanup() {
+    [ -n "$td" ] && rm -fr -- "$td"
+    if [ "$1" != EXIT ] ; then
+        trap - "$1"
+        kill "-$1" "$$"
+    fi
+}
+for sig in EXIT HUP INT TERM ; do
+    # shellcheck disable=SC2064
+    trap "cleanup $sig" "$sig"
+done
+td=$(mktd "$self") || exit
+
+# We'll operate on stdin in the temp directory; write the script's stdin to it
+# with cat(1)
+cat -- "${@:-}" >"$td"/stdin
+
+# Only when that write is finished do we finally spit it all back out again
+cat -- "$td"/stdin
-- 
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