Add and use sparse-gunzip in loopback-rootfs

This reduces the space required from the full size of the compressed
disk image, which meant that tests could not be run on systems where
TMPDIR is a smallish tmpfs.

1 files changed, 6 insertions, 0 deletions

diff --git a/scripts/sparse-gunzip b/scripts/sparse-gunzip
new file mode 100755
index 00000000..b6e1aa16
--- /dev/null
+++ b/scripts/sparse-gunzip
@@ -0,0 +1,6 @@
+#!/usr/bin/python
+from morphlib.util import copyfileobj
+import gzip, sys
+infh = gzip.GzipFile(fileobj=sys.stdin)
+copyfileobj(infh, sys.stdout)
+infh.close()