1 files changed, 50 insertions, 0 deletions
diff --git a/test/scripts/ramdisk_darwin.sh b/test/scripts/ramdisk_darwin.sh
new file mode 100755
index 0000000000..1622ea0c4a
--- /dev/null
+++ b/test/scripts/ramdisk_darwin.sh
@@ -0,0 +1,50 @@
+#!/usr/bin/env sh
+
+set -euo pipefail
+
+# Unmount a leftover mount point in case something went really wrong.
+if [ -e test/ramdisk ]; then
+    diskutil eject test/ramdisk -force 2>/dev/null || true
+fi
+
+# Create the ramdisk.
+DEVICE=$(hdid -nomount ram://$1)
+export BLOCKSIZE=4096
+newfs_hfs -v 'ramdisk' -b ${BLOCKSIZE} ${DEVICE} 2>/dev/null
+
+# Mount the ramdisk.
+rm -rf test/ramdisk
+mkdir -p test/ramdisk
+function remount { mount $@ -o nobrowse -t hfs ${DEVICE} test/ramdisk; }
+remount
+
+# Ensure that we're always unmounting the ramdisk to prevent them from piling up.
+function finish {
+  diskutil eject test/ramdisk -force
+  rm -rf test/ramdisk
+}
+trap finish EXIT
+
+# Remount with different options until we get a signal to terminate.
+while read -r LINE; do
+  case ${LINE} in
+    readonly)
+        remount -u -r
+        ;;
+    readwrite)
+        remount -u -w
+        ;;
+    filldisk*)
+        # Creates a file that fills up all sectors on the disk, but leaves room for the specified
+        # amount of sectors
+        rm -f test/ramdisk/fill
+        REMAINING=$((${LINE#filldisk}))
+        COUNT=$(df test/ramdisk | awk "!/Used/{print \$4 - ${REMAINING}}")
+        dd of=test/ramdisk/fill bs=${BLOCKSIZE} count=${COUNT} </dev/zero 2>/dev/null
+        ;;
+    emptydisk)
+        rm -f test/ramdisk/fill
+  esac
+  # df test/ramdisk >&2
+  echo "\n\0"
+done