[CRIU] [PATCH] scripts: spfs-release-replace.sh introduced

[Stanislav Kinsburskiy]

This script should be used to trigger actual file systems replace by SPFS
manager.
By default mount point replace processes are on hold waiting for message to
proceed with replace. The reason for this hold is that otherwise SPFS manager
can race with criu on attempt to attach to processes (actual file system can
be remounted before criu released processes).

Signed-off-by: Stanislav Kinsburskiy <skinsbursky at virtuozzo.com>
---
 scripts/spfs-release-replace.sh |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100755 scripts/spfs-release-replace.sh

diff --git a/scripts/spfs-release-replace.sh b/scripts/spfs-release-replace.sh
new file mode 100755
index 0000000..0b91669
--- /dev/null
+++ b/scripts/spfs-release-replace.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+[[ "post-restore" == "$CRTOOLS_SCRIPT_ACTION" ]] || exit 0
+
+set -o pipefail
+
+if [ -z "$SPFS_MANAGER_SOCK" ]; then
+	echo "SPFS_MANAGER_SOCK environment variable is not set"
+	exit 1
+fi
+
+if [ -z "$SPFS_MODE" ]; then
+	echo "SPFS_MODE environment variable is not set"
+	exit 1
+fi
+
+[ -e $SPFS_MANAGER_SOCK ] || exit 0
+
+if [ ! -S "$SPFS_MANAGER_SOCK" ]; then
+	echo "$SPFS_MANAGER_SOCK is not a socket"
+	exit 1
+fi
+
+SPFS_CLIENT="/usr/sbin/spfs-client"
+
+if [ ! -x "$SPFS_CLIENT" ]; then
+	echo "Filed to find executable /usr/sbin/spfs-client"
+	exit 1
+fi
+
+$SPFS_CLIENT manage "mode;all;mode=$SPFS_MODE" --socket-path $SPFS_MANAGER_SOCK > /dev/null
+exit $?