[CRIU] [PATCH v4 2/7] util: add rm -rf function

[Tycho Andersen]

Signed-off-by: Tycho Andersen <tycho.andersen at canonical.com>
---
 criu/include/util.h |  3 +++
 criu/util.c         | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/criu/include/util.h b/criu/include/util.h
index 68ff103..b7313cf 100644
--- a/criu/include/util.h
+++ b/criu/include/util.h
@@ -278,6 +278,9 @@ int setup_tcp_server(char *type);
 int run_tcp_server(bool daemon_mode, int *ask, int cfd, int sk);
 int setup_tcp_client(char *addr);
 
+/* *dir should be writable and at least PATH_MAX long */
+int rm_rf(char *dir);
+
 #define LAST_PID_PATH		"sys/kernel/ns_last_pid"
 #define PID_MAX_PATH		"sys/kernel/pid_max"
 
diff --git a/criu/util.c b/criu/util.c
index 2cf0355..cb03bdd 100644
--- a/criu/util.c
+++ b/criu/util.c
@@ -1185,3 +1185,43 @@ int setup_tcp_client(char *addr)
 
 	return sk;
 }
+
+int rm_rf(char *target)
+{
+	int offset = strlen(target);
+	DIR *dir = NULL;
+	struct dirent *de;
+	int ret = -1;
+
+	dir = opendir(target);
+	if (!dir) {
+		pr_perror("unable to open %s", target);
+		return -1;
+	}
+
+	while ((de = readdir(dir))) {
+		int n;
+
+		if (dir_dots(de))
+			continue;
+
+		n = snprintf(target+offset, PATH_MAX-offset, "/%s", de->d_name);
+		if (n < 0 || n >= PATH_MAX) {
+			pr_err("snprintf failed\n");
+			goto out;
+		}
+
+		if (de->d_type == DT_DIR && rm_rf(target))
+			goto out;
+
+		if (remove(target) < 0) {
+			pr_perror("unable to remove %s", target);
+			goto out;
+		}
+	}
+
+	ret = 0;
+out:
+	target[offset] = 0;
+	return ret;
+}
-- 
2.9.3