1 files changed, 138 insertions, 0 deletions
diff --git a/tests/acceptance/virtiofs_submounts.py.data/guest.sh b/tests/acceptance/virtiofs_submounts.py.data/guest.sh
new file mode 100644
index 0000000000..59ba40fde1
--- /dev/null
+++ b/tests/acceptance/virtiofs_submounts.py.data/guest.sh
@@ -0,0 +1,138 @@
+#!/bin/bash
+
+function print_usage()
+{
+    if [ -n "$2" ]; then
+        echo "Error: $2"
+        echo
+    fi
+    echo "Usage: $1 <shared dir>"
+    echo '(The shared directory is the "share" directory in the scratch' \
+         'directory)'
+}
+
+shared_dir=$1
+if [ -z "$shared_dir" ]; then
+    print_usage "$0" 'Shared dir not given' >&2
+    exit 1
+fi
+
+cd "$shared_dir"
+
+# FIXME: This should not be necessary, but it is.  In order for all
+# submounts to be proper mount points, we need to visit them.
+# (Before we visit them, they will not be auto-mounted, and so just
+# appear as normal directories, with the catch that their st_ino will
+# be the st_ino of the filesystem they host, while the st_dev will
+# still be the st_dev of the parent.)
+# `find` does not work, because it will refuse to touch the mount
+# points as long as they are not mounted; their st_dev being shared
+# with the parent and st_ino just being the root node's inode ID
+# will practically ensure that this node exists elsewhere on the
+# filesystem, and `find` is required to recognize loops and not to
+# follow them.
+# Thus, we have to manually visit all nodes first.
+
+mnt_i=0
+
+function recursively_visit()
+{
+    pushd "$1" >/dev/null
+    for entry in *; do
+        if [[ "$entry" == mnt* ]]; then
+            mnt_i=$((mnt_i + 1))
+            printf "Triggering auto-mount $mnt_i...\r"
+        fi
+
+        if [ -d "$entry" ]; then
+            recursively_visit "$entry"
+        fi
+    done
+    popd >/dev/null
+}
+
+recursively_visit .
+echo
+
+
+if [ -n "$(find -name not-mounted)" ]; then
+    echo "Error: not-mounted files visible on mount points:" >&2
+    find -name not-mounted >&2
+    exit 1
+fi
+
+if [ ! -f some-file -o "$(cat some-file)" != 'root' ]; then
+    echo "Error: Bad file in the share root" >&2
+    exit 1
+fi
+
+shopt -s nullglob
+
+function check_submounts()
+{
+    local base_path=$1
+
+    for mp in mnt*; do
+        printf "Checking submount %i...\r" "$((${#devs[@]} + 1))"
+
+        mp_i=$(echo "$mp" | sed -e 's/mnt//')
+        dev=$(stat -c '%D' "$mp")
+
+        if [ -n "${devs[mp_i]}" ]; then
+            echo "Error: $mp encountered twice" >&2
+            exit 1
+        fi
+        devs[mp_i]=$dev
+
+        pushd "$mp" >/dev/null
+        path="$base_path$mp"
+        while true; do
+            expected_content="$(printf '%s\n%s\n' "$mp_i" "$path")"
+            if [ ! -f some-file ]; then
+                echo "Error: $PWD/some-file does not exist" >&2
+                exit 1
+            fi
+
+            if [ "$(cat some-file)" != "$expected_content" ]; then
+                echo "Error: Bad content in $PWD/some-file:" >&2
+                echo '--- found ---'
+                cat some-file
+                echo '--- expected ---'
+                echo "$expected_content"
+                exit 1
+            fi
+            if [ "$(stat -c '%D' some-file)" != "$dev" ]; then
+                echo "Error: $PWD/some-file has the wrong device ID" >&2
+                exit 1
+            fi
+
+            if [ -d sub ]; then
+                if [ "$(stat -c '%D' sub)" != "$dev" ]; then
+                    echo "Error: $PWD/some-file has the wrong device ID" >&2
+                    exit 1
+                fi
+                cd sub
+                path="$path/sub"
+            else
+                if [ -n "$(echo mnt*)" ]; then
+                    check_submounts "$path/"
+                fi
+                break
+            fi
+        done
+        popd >/dev/null
+    done
+}
+
+root_dev=$(stat -c '%D' some-file)
+devs=()
+check_submounts ''
+echo
+
+reused_devs=$(echo "$root_dev ${devs[@]}" | tr ' ' '\n' | sort | uniq -d)
+if [ -n "$reused_devs" ]; then
+    echo "Error: Reused device IDs: $reused_devs" >&2
+    exit 1
+fi
+
+echo "Test passed for ${#devs[@]} submounts."