[PATCH 08/17] installer: Mount BTRFS layout before installing the system

[Stefan Schantl <stefan.schantl@ipfire.org>]

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Signed-off-by: Stefan Schantl <stefan.schantl(a)ipfire.org>
---
 src/installer/hw.c | 48 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/src/installer/hw.c b/src/installer/hw.c
index cb6a8ab81..e520fb687 100644
--- a/src/installer/hw.c
+++ b/src/installer/hw.c
@@ -926,6 +926,7 @@ int hw_create_btrfs_layout(const char* path, const char* output) {
 
 int hw_mount_filesystems(struct hw_destination* dest, const char* prefix) {
 	char target[STRING_SIZE];
+	int r;
 
 	assert(*prefix == '/');
 
@@ -953,9 +954,17 @@ int hw_mount_filesystems(struct hw_destination* dest, const char* prefix) {
 	}
 
 	// root
-	int r = hw_mount(dest->part_root, prefix, filesystem, 0);
-	if (r)
-		return r;
+	if (dest->filesystem == HW_FS_BTRFS) {
+		r = hw_mount_btrfs_subvolumes(dest->part_root);
+
+		if (r)
+			return r;
+	} else {
+		r = hw_mount(dest->part_root, prefix, filesystem, 0);
+
+		if (r)
+			return r;
+	}
 
 	// boot
 	snprintf(target, sizeof(target), "%s%s", prefix, HW_PATH_BOOT);
@@ -1019,6 +1028,39 @@ int hw_mount_filesystems(struct hw_destination* dest, const char* prefix) {
 	return 0;
 }
 
+int hw_mount_btrfs_subvolumes(const char* source) {
+	int r;
+	char path[STRING_SIZE];
+	char options[STRING_SIZE];
+
+	// Mount the root subvolume
+	snprintf(options, sizeof(options), "subvol=%s,%s", btrfs_subvolumes[0][0], BTRFS_MOUNT_OPTIONS);
+	r = mount(source, DESTINATION_MOUNT_PATH, "btrfs", NULL, options);
+
+	if (r)
+		return r;
+
+	// Loop through the remain array of known subvolumes.
+	for ( int i = 1; i < LEN(btrfs_subvolumes); i++ ) {
+		snprintf(path, sizeof(path), "%s%s", DESTINATION_MOUNT_PATH, btrfs_subvolumes[i][1]);
+		snprintf(options, sizeof(options), "subvol=%s,", btrfs_subvolumes[i][0], BTRFS_MOUNT_OPTIONS);
+
+		// Create the directory.
+		r = hw_mkdir(path, S_IRWXU|S_IRWXG|S_IRWXO);
+
+		if(r != 0 && errno != EEXIST)
+			return r;
+
+		// Try to mount the subvolume.
+		r = mount(source, path, "btrfs", NULL, options);
+
+		if (r)
+			return r;
+	}
+	
+	return 0;
+}
+
 int hw_umount_filesystems(struct hw_destination* dest, const char* prefix) {
 	int r;
 	char target[STRING_SIZE];
-- 
2.39.2