lib/pb-config: Add config_copy

At the moment, UIs have the config_set_defaults function to estabilish
an initial configuration when performing an update.

Rather than using the defaults, this change provides a config_copy()
function, so that the updated configuration can be initialised from the
current config.

With this in place, the UI/server-common pb-config module can be reduced
to just the one function.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

2 files changed, 65 insertions, 0 deletions

diff --git a/lib/pb-config/pb-config.c b/lib/pb-config/pb-config.c
index 915a01d..9f696d5 100644
--- a/lib/pb-config/pb-config.c
+++ b/lib/pb-config/pb-config.c
@@ -1,4 +1,6 @@
 
+#include <string.h>
+
 #include <log/log.h>
 #include <types/types.h>
 #include <talloc/talloc.h>
@@ -29,6 +31,67 @@ void config_set_defaults(struct config *config)
 
 }
 
+static struct interface_config *config_copy_interface(struct config *ctx,
+		struct interface_config *src)
+{
+	struct interface_config *dest = talloc(ctx, struct interface_config);
+
+	memcpy(dest->hwaddr, src->hwaddr, sizeof(src->hwaddr));
+	dest->ignore = src->ignore;
+
+	if (dest->ignore)
+		return dest;
+
+	dest->method = src->method;
+
+	switch (src->method) {
+	case CONFIG_METHOD_DHCP:
+		break;
+	case CONFIG_METHOD_STATIC:
+		dest->static_config.address =
+			talloc_strdup(dest, src->static_config.address);
+		dest->static_config.gateway =
+			talloc_strdup(dest, src->static_config.gateway);
+		break;
+	}
+
+	return dest;
+}
+
+struct config *config_copy(void *ctx, const struct config *src)
+{
+	struct config *dest;
+	unsigned int i;
+
+	dest = talloc(ctx, struct config);
+	dest->autoboot_enabled = src->autoboot_enabled;
+	dest->autoboot_timeout_sec = src->autoboot_timeout_sec;
+
+	dest->network.n_interfaces = src->network.n_interfaces;
+	dest->network.interfaces = talloc_array(dest, struct interface_config *,
+					dest->network.n_interfaces);
+	dest->network.n_dns_servers = src->network.n_dns_servers;
+	dest->network.dns_servers = talloc_array(dest, const char *,
+					dest->network.n_dns_servers);
+
+	for (i = 0; i < src->network.n_interfaces; i++)
+		dest->network.interfaces[i] = config_copy_interface(dest,
+				src->network.interfaces[i]);
+
+	for (i = 0; i < src->network.n_dns_servers; i++)
+		dest->network.dns_servers[i] = talloc_strdup(dest,
+				src->network.dns_servers[i]);
+
+	dest->n_boot_priorities = src->n_boot_priorities;
+	dest->boot_priorities = talloc_array(dest, struct boot_priority,
+			src->n_boot_priorities);
+
+	for (i = 0; i < src->n_boot_priorities; i++)
+		dest->boot_priorities[i].type = src->boot_priorities[i].type;
+
+	return dest;
+}
+
 void dump_config(struct config *config);
 void dump_config(struct config *config)
 {
diff --git a/lib/pb-config/pb-config.h b/lib/pb-config/pb-config.h
index 1cfaca3..e430301 100644
--- a/lib/pb-config/pb-config.h
+++ b/lib/pb-config/pb-config.h
@@ -16,5 +16,7 @@ int config_fini(void);
 /* for use by the storage backends */
 void config_set_defaults(struct config *config);
 
+struct config *config_copy(void *ctx, const struct config *src);
+
 #endif /* CONFIGURATION_H */