[systemd-devel] [PATCH] Add support for "ROOT=" on the kernel command line

[harald at redhat.com]

From: Harald Hoyer <harald at redhat.com>

"ROOT=" mounts the initial ramdisk with a tmpfs filesystem.
---
 src/fstab-generator/fstab-generator.c       | 5 +++++
 src/gpt-auto-generator/gpt-auto-generator.c | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index bc4c155..3d2e4dd 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -498,6 +498,11 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 if (free_and_strdup(&arg_root_what, value) < 0)
                         return log_oom();
 
+        } else if (streq(key, "ROOT") && value) {
+
+                if (free_and_strdup(&arg_root_what, value) < 0)
+                        return log_oom();
+
         } else if (streq(key, "rootfstype") && value) {
 
                 if (free_and_strdup(&arg_root_fstype, value) < 0)
diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c
index 909fdda..85ceffd 100644
--- a/src/gpt-auto-generator/gpt-auto-generator.c
+++ b/src/gpt-auto-generator/gpt-auto-generator.c
@@ -613,6 +613,13 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
 
                 arg_root_enabled = streq(value, "gpt-auto");
 
+        } else if (streq(key, "ROOT") && value) {
+
+                /* Disable root disk logic if there's a ROOT= value
+                 * specified (unless it happens to be "gpt-auto") */
+
+                arg_root_enabled = streq(value, "gpt-auto");
+
         } else if (streq(key, "rw") && !value)
                 arg_root_rw = true;
         else if (streq(key, "ro") && !value)
-- 
2.2.1