[sheepdog] [PATCH v2 2/2] collie: restore snapshot only when stdin is pipe

[MORITA Kazutaka]

We don't expect that stdin is console when doing the 'vdi restore'
command.

Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
---
 collie/vdi.c   | 6 ++++++
 include/util.h | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/collie/vdi.c b/collie/vdi.c
index 0a0814f..5603f97 100644
--- a/collie/vdi.c
+++ b/collie/vdi.c
@@ -1839,6 +1839,12 @@ static int vdi_restore(int argc, char **argv)
 		goto out;
 	}
 
+	if (is_stdin_console()) {
+		fprintf(stderr, "stdin must be pipe\n");
+		ret = EXIT_USAGE;
+		goto out;
+	}
+
 	ret = do_vdi_delete(vdiname, 0, NULL);
 	if (ret != EXIT_SUCCESS) {
 		fprintf(stderr, "Failed to delete the current state\n");
diff --git a/include/util.h b/include/util.h
index 192e3fd..8ba6710 100644
--- a/include/util.h
+++ b/include/util.h
@@ -148,6 +148,11 @@ static inline void uatomic_set_false(uatomic_bool *val)
 #define TEXT_CYAN           "\033[0;36m"
 #define TEXT_BOLD_CYAN      "\033[1;36m"
 
+static inline bool is_stdin_console(void)
+{
+	return isatty(STDIN_FILENO);
+}
+
 static inline bool is_stdout_console(void)
 {
 	return isatty(STDOUT_FILENO);
-- 
1.8.1.3.566.gaa39828