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-rw-r--r--src/shared/virt.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/src/shared/virt.c b/src/shared/virt.c
index f9c4e67c74..f10baab40b 100644
--- a/src/shared/virt.c
+++ b/src/shared/virt.c
@@ -293,8 +293,26 @@ int detect_container(const char **id) {
r = read_one_line_file("/run/systemd/container", &m);
if (r == -ENOENT) {
- r = 0;
- goto finish;
+
+ /* Fallback for cases where PID 1 was not
+ * systemd (for example, cases where
+ * init=/bin/sh is used. */
+
+ r = getenv_for_pid(1, "container", &m);
+ if (r <= 0) {
+
+ /* If that didn't work, give up,
+ * assume no container manager.
+ *
+ * Note: This means we still cannot
+ * detect containers if init=/bin/sh
+ * is passed but privileges dropped,
+ * as /proc/1/environ is only readable
+ * with privileges. */
+
+ r = 0;
+ goto finish;
+ }
}
if (r < 0)
return r;