From b8aba9e05e00cff5abd5aeb22a66cd4a56e144bd Mon Sep 17 00:00:00 2001
From: Alejandro Mery <amery@jpi.io>
Date: Mon, 28 Aug 2023 15:44:45 +0100
Subject: [PATCH] WIP

Signed-off-by: Alejandro Mery <amery@jpi.io>
---
 go.mod             |  1 +
 go.sum             |  2 ++
 pkg/ceph/ceph.go   |  2 ++
 pkg/ceph/config.go | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 pkg/zones/ceph.go  | 30 ++++++++++++++++++++
 pkg/zones/scan.go  | 16 +++++++++++
 6 files changed, 121 insertions(+)
 create mode 100644 pkg/ceph/ceph.go
 create mode 100644 pkg/ceph/config.go
 create mode 100644 pkg/zones/ceph.go

diff --git a/go.mod b/go.mod
index 65e9c3a..596ff94 100644
--- a/go.mod
+++ b/go.mod
@@ -8,6 +8,7 @@ require (
 	darvaza.org/sidecar v0.0.0-20230721122716-b9c54b8adbaf
 	darvaza.org/slog v0.5.2
 	github.com/burntSushi/toml v0.3.1
+	github.com/gofrs/uuid/v5 v5.0.0
 	github.com/hack-pad/hackpadfs v0.2.1
 	github.com/mgechev/revive v1.3.2
 	github.com/spf13/cobra v1.7.0
diff --git a/go.sum b/go.sum
index 0903f1f..1b4e2db 100644
--- a/go.sum
+++ b/go.sum
@@ -26,6 +26,8 @@ github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBD
 github.com/fatih/structtag v1.2.0 h1:/OdNE99OxoI/PqaW/SuSK9uxxT3f/tcSZgon/ssNSx4=
 github.com/fatih/structtag v1.2.0/go.mod h1:mBJUNpUnHmRKrKlQQlmCrh5PuhftFbNv8Ys4/aAZl94=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/gofrs/uuid/v5 v5.0.0 h1:p544++a97kEL+svbcFbCQVM9KFu0Yo25UoISXGNNH9M=
+github.com/gofrs/uuid/v5 v5.0.0/go.mod h1:CDOjlDMVAtN56jqyRUZh58JT31Tiw7/oQyEXZV+9bD8=
 github.com/hack-pad/hackpadfs v0.2.1 h1:FelFhIhv26gyjujoA/yeFO+6YGlqzmc9la/6iKMIxMw=
 github.com/hack-pad/hackpadfs v0.2.1/go.mod h1:khQBuCEwGXWakkmq8ZiFUvUZz84ZkJ2KNwKvChs4OrU=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
diff --git a/pkg/ceph/ceph.go b/pkg/ceph/ceph.go
new file mode 100644
index 0000000..53e1099
--- /dev/null
+++ b/pkg/ceph/ceph.go
@@ -0,0 +1,2 @@
+// Package ceph deals with ceph config
+package ceph
diff --git a/pkg/ceph/config.go b/pkg/ceph/config.go
new file mode 100644
index 0000000..19c7fe2
--- /dev/null
+++ b/pkg/ceph/config.go
@@ -0,0 +1,70 @@
+package ceph
+
+import (
+	"bytes"
+	"io"
+	"net/netip"
+
+	"github.com/gofrs/uuid/v5"
+	"gopkg.in/gcfg.v1"
+)
+
+// Config represents a ceph.conf file
+type Config struct {
+	Global GlobalConfig
+}
+
+// WriteTo writes a Wireguard [Config] onto the provided [io.Writer]
+func (*Config) WriteTo(w io.Writer) (int64, error) {
+	var buf bytes.Buffer
+
+	return buf.WriteTo(w)
+}
+
+// GlobalConfig represents the [global] section of a ceph.conf file
+type GlobalConfig struct {
+	FSID         uuid.UUID
+	Monitors     []string
+	MonitorsAddr []netip.Addr
+}
+
+type intermediateConfig struct {
+	Global intermediateGlobalConfig
+}
+
+func (p intermediateConfig) Export() (*Config, error) {
+	var out Config
+	var err error
+
+	// [global]
+	out.Global, err = p.Global.Export()
+	if err != nil {
+		return nil, err
+	}
+
+	return &out, nil
+}
+
+type intermediateGlobalConfig struct {
+	FSID              uuid.UUID
+	MonInitialMembers string
+	MonHost           string
+	ClusterNetwork    string
+}
+
+func (intermediateGlobalConfig) Export() (GlobalConfig, error) {
+	var out GlobalConfig
+	var err error
+
+	return out, err
+}
+
+func NewConfigFromReader(r io.Reader) (*Config, error) {
+	var temp intermediateConfig
+
+	if err := gcfg.ReadInto(&temp, r); err != nil {
+		return nil, err
+	}
+
+	return temp.Export()
+}
diff --git a/pkg/zones/ceph.go b/pkg/zones/ceph.go
new file mode 100644
index 0000000..550827b
--- /dev/null
+++ b/pkg/zones/ceph.go
@@ -0,0 +1,30 @@
+package zones
+
+import (
+	"bytes"
+
+	"git.jpi.io/amery/jpictl/pkg/ceph"
+)
+
+// GetCephConfig reads the ceph.conf file
+func (m *Zones) GetCephConfig() (*ceph.Config, error) {
+	data, err := m.ReadFile("ceph.conf")
+	if err != nil {
+		return nil, err
+	}
+
+	r := bytes.NewReader(data)
+	return ceph.NewConfigFromReader(r)
+}
+
+// WriteCephConfig writes the ceph.conf file
+func (m *Zones) WriteCephConfig(cfg *ceph.Config) error {
+	f, err := m.CreateTruncFile("ceph.conf")
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = cfg.WriteTo(f)
+	return err
+}
diff --git a/pkg/zones/scan.go b/pkg/zones/scan.go
index 08734a3..fb60603 100644
--- a/pkg/zones/scan.go
+++ b/pkg/zones/scan.go
@@ -2,6 +2,8 @@ package zones
 
 import (
 	"io/fs"
+	"log"
+	"os"
 	"sort"
 )
 
@@ -12,6 +14,7 @@ func (m *Zones) scan(opts *ScanOptions) error {
 		m.scanZoneIDs,
 		m.scanSort,
 		m.scanGateways,
+		m.scanCephMonitors,
 	} {
 		if err := fn(opts); err != nil {
 			return err
@@ -121,6 +124,19 @@ func (m *Zones) scanGateways(_ *ScanOptions) error {
 	return err
 }
 
+func (m *Zones) scanCephMonitors() error {
+	cfg, err := m.GetCephConfig()
+	switch {
+	case os.IsNotExist(err):
+		err = nil
+	case err != nil:
+		return err
+	}
+
+	log.Print(cfg)
+	return nil
+}
+
 func (z *Zone) scan() error {
 	// each directory is a machine
 	entries, err := fs.ReadDir(z.zones.dir, z.Name)