docker-run.sh: Add new options: ++rsync_to and ++rsync_from

These options provide a convenient way of transferring data
between the host and the container.  It is useful in two
scenarios:
1. The container is using scratch volumes for its filesystem
   and has no access to the host's filesystem -- e.g., container
   for precommit testing.
2. The container is started on a remote host, and there is
   a need to transfer back and forth.

On the backend side this is implemented with a new command
${prefix}container_rsync.  Marker ":" at the start of an argument
expands into remote specification.  E.g.,
"container_rsync -a --del data_to/ :data/" will transfer
"./data_to/" inside the container; while
"container rsync -a --del :data/ data_from/" will transfer it back.

Change-Id: I3f1353862899e3843f7454a0e84af38794bbd6ba

1 files changed, 21 insertions, 1 deletions

diff --git a/docker-run.sh b/docker-run.sh
index b021b9bf..c0cd6835 100755
--- a/docker-run.sh
+++ b/docker-run.sh
@@ -35,4 +35,24 @@ else
     JENKINS_FLOCK=""
 fi
 
-${prefix}container_exec "$@"
+# Rsync specified directories to the container.
+# This is, primarily, for task==precommit, when we don't bind-mount $WORKSPACE.
+if test_array rsync_to; then
+    declare -a rsync_to
+    for dir in "${rsync_to[@]}"; do
+	${prefix}container_rsync -a --del "$dir" ":$dir"
+    done
+fi
+
+${prefix}container_exec "$@" &
+res=0 && wait $! || res=$?
+
+# Rsync specified directories from the container.
+if test_array rsync_from; then
+    declare -a rsync_from
+    for dir in "${rsync_from[@]}"; do
+	${prefix}container_rsync -a --del ":$dir" "$dir"
+    done
+fi
+
+exit $res