Adding ability to handle non bcachefs as root filesystem

Wrapping UI rework and rollback progress addition.
Huge refactor, quicksave
2026-09-22 17:25:02 +02:00 · 2026-09-17 23:42:01 +02:00 · 2026-09-17 21:54:20 +02:00 · 2026-09-10 00:24:07 +02:00 · 2026-09-07 17:54:05 +02:00 · 2026-09-07 17:45:43 +02:00
5 changed files with 748 additions and 203 deletions
@@ -2,15 +2,6 @@
 # It is not intended for manual editing.
 version = 4

-[[package]]
-name = "aho-corasick"
-version = "1.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c982642fa9e8606056828ee9a8505737230110bb1099153c79efe865c59d12ba"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "allocator-api2"
 version = "0.2.21"
@@ -34,9 +25,9 @@ checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"

 [[package]]
 name = "bitflags"
-version = "2.13.1"
+version = "2.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b588b76d00fde79687d7646a9b5bdf3cc0f655e0bbd080335a95d7e96f3587da"
+checksum = "3ded4057c258ba199e2d26386d3af3780957ecaee6c4ef4041c6b4b8b97c0b06"

 [[package]]
 name = "by_address"
@@ -55,9 +46,9 @@ dependencies = [

 [[package]]
 name = "cfg-if"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+checksum = "4e7648175b45a9a48536d676f68d918270699102aa8dab5496df06904c914600"

 [[package]]
 name = "cfg_aliases"
@@ -81,9 +72,9 @@ dependencies = [

 [[package]]
 name = "darling"
-version = "0.24.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88490bf1b990d87eaaa7ac8aa887f629a08e7359765b4911faf63c3763347d23"
+checksum = "ed17f5901b6630b993ca003def43f2f8ef4014fc13b047b57aad617ff32bc2ec"
 dependencies = [
 "darling_core",
 "darling_macro",
@@ -91,26 +82,26 @@ dependencies = [

 [[package]]
 name = "darling_core"
-version = "0.24.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "084e274f91c482280130e1e34e0b8d6e66776a060d7b6de7b84289ca778868c4"
+checksum = "6837e2cf7485aaae18f86181d2f0e9a7ed297a025e220aeabf63fdebd3a2ddff"
 dependencies = [
 "ident_case",
 "proc-macro2",
 "quote",
 "strsim",
- "syn 3.0.3",
+ "syn 3.0.5",
 ]

 [[package]]
 name = "darling_macro"
-version = "0.24.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68f5792fa0d41cd2325ce0ffa64f0a340eaebd4971a3a0c5e1ffd2cc488a355e"
+checksum = "2ac7135c3ef02b2f7833bbeb1be5ba7f966dcde8a87c6b87f65a778d71a02785"
 dependencies = [
 "darling_core",
 "quote",
- "syn 3.0.3",
+ "syn 3.0.5",
 ]

 [[package]]
@@ -121,9 +112,9 @@ checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"

 [[package]]
 name = "either"
-version = "1.17.0"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e5e8f6c15a24b9a3ee5efec809ccd006d3b30e8b3bb63c39af737c7f87daa1d"
+checksum = "252afb9ae5eaa683babdc6a068b3f5726eb19e05070c731f9b2a23a7c3e8ed34"

 [[package]]
 name = "equivalent"
@@ -190,7 +181,7 @@ dependencies = [
 "indoc",
 "proc-macro2",
 "quote",
- "syn 3.0.3",
+ "syn 3.0.5",
 ]

 [[package]]
@@ -242,19 +233,13 @@ dependencies = [

 [[package]]
 name = "lru"
-version = "0.18.2"
+version = "0.18.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d2f2f9b4ba7e6b24d95e7e899329d35be83bcded72c8540cdd5368932d1d90a"
+checksum = "ff9840bcc50b71349309900da0ce7279aa336ae71d73250b07998932c7d97c25"
 dependencies = [
 "hashbrown 0.17.1",
 ]

-[[package]]
-name = "memchr"
-version = "2.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf8baf1c55e62ffcace7a9f06f4bd9cd3f0c4beb022d3b367256b91b87513d98"
-
 [[package]]
 name = "nix"
 version = "0.31.3"
@@ -299,12 +284,12 @@ checksum = "6aa2c4e539b869820a2b82e1aef6ff40aa85e65decdd5185e83fb4b1249cd00f"

 [[package]]
 name = "nyanit"
-version = "0.2.1"
+version = "0.2.3"
 dependencies = [
 "nix",
 "ratatui",
 "ratatui-textarea",
- "regex",
+ "regex-lite",
 "termion",
 ]

@@ -450,33 +435,10 @@ dependencies = [
 ]

 [[package]]
-name = "regex"
-version = "1.13.1"
+name = "regex-lite"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f020237b6c8eed93db2e2cb53c00c60a8e1bc73da7d073199a1180401450218d"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-automata",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.4.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad8553b9b26413251cbf30e620595c7a41b3887f03da04579c0e6b0d6a06b4b2"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.8.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6f6ff9a378485b298a5286656da665ba74413d36db0979633275d2e708145d4"
+checksum = "cab834c73d247e67f4fae452806d17d3c7501756d98c8808d7c9c7aa7d18f973"

 [[package]]
 name = "rustversion"
@@ -517,7 +479,7 @@ checksum = "e7a5d71263a5a7d47b41f6b3f06ba276f10cc18b0931f1799f710578e2309348"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 3.0.3",
+ "syn 3.0.5",
 ]

 [[package]]
@@ -566,9 +528,9 @@ dependencies = [

 [[package]]
 name = "syn"
-version = "3.0.3"
+version = "3.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e9bae58849f64dfa4f5d5ae372c8341f7305f82a3868709269343628b659a3"
+checksum = "12df2e0110f65b775f769bb17ef989067a1d931b2eb822bd4346631eeada89f9"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -602,7 +564,7 @@ checksum = "bc04cd3e1236dd4a98afca4569f2deb3f120e5422a4023be2cb683f8486292af"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 3.0.3",
+ "syn 3.0.5",
 ]

 [[package]]
@@ -628,9 +590,9 @@ checksum = "9e1c906769ad99c88eaa54e728060edef082f8e358ff32030cb7c7d315e81109"

 [[package]]
 name = "unicode-ident"
-version = "1.0.24"
+version = "1.0.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
+checksum = "ab72a15cf68d77cb0987d3684aa8a45c5ef827e8cb49ee2f30bfd7ba2feb519f"

 [[package]]
 name = "unicode-segmentation"
@@ -1,13 +1,13 @@
 [package]
 name = "nyanit"
-version = "0.2.1"
+version = "0.2.3"
 edition = "2024"

 [dependencies]
 nix = { version = "0.31", features = ["mount"] }
 ratatui = { version = "0.30", default-features = false, features = ["termion"] }
 ratatui-textarea = { version = "0.9", default-features = false, features = ["termion"] }
-regex = "1"
+regex-lite = "0.1"
 termion = "4"

 [profile.release]
@@ -15,5 +15,8 @@ lto = true
 debug = false
 incremental = false
 codegen-units = 1
-opt-level = 2
+opt-level = "s"
 strip = true
+
+[registry]
+global-min-publish-age = "14 days"
@@ -8,14 +8,23 @@ And this partition should be formated to bcachefs.

 2. Nyanit checks if bcachefs is encrypted, and asks for unlock password if it is.

-3. Then it mounts it to **/mnt/bee-root**.
+3. Then it mounts it to **/mnt/real-bee**.

-4. And looks for snapshots with name pattern **/mnt/bee-root/bzz_snaps/bzz-yyyy-mm-ddTHH-MM-SS**
+4. Now dealing with snapshoots. Its getting complicated because we need to have then outside root subvolume
+Root subvolume should be named **bee-root**
+Snapshoots made by hive-up should be placed in **bee-root/bzz-snaps** - **/mnt/real-bee/bee-root/bzz-snaps**
+We need to transver snapshoot if any from **/mnt/real-bee/bee-root/bzz-snaps** to **/mnt/real-bee/bzz-snaps**
+Snapshoots names should match **bzz-yyyy-mm-ddTHH-MM-SS** pattern.

-5. If no snapshots are found it calls **switch_root** for **/mnt/bee-root**
+4. And looks for snapshots with name pattern **/mnt/real-bee/bzz-snaps/bzz-yyyy-mm-ddTHH-MM-SS**
+
+5. If no snapshots are found it calls **switch_root** for **/mnt/real-bee/bee-root**

 6. Othervise vait for F2 for few seconds.
 And if F2 pressed provides list of snapshoots to boot from.

-7. After some snapshoot or just **/mnt/bee-root** is selected, Nyanit doing **switch_root** to it.
+7. After some snapshoot or just **/mnt/bee-root/real-bee** is selected, Nyanit doing **switch_root** to it.

+8. TO-DO 
+- add cleaning of old snapshoots. 
+- add replacing bee-root with snapshoot
@@ -18,18 +18,19 @@ use ratatui::{Frame, Terminal, backend::TermionBackend};
 use ratatui::{
    layout::{Constraint, Layout},
    style::{Color, Style, Stylize},
-    text::Line,
-    widgets::{Block, Borders, List, ListState, Paragraph},
+    text::{Line, Span},
+    widgets::{Block, Borders, Gauge, List, ListItem, ListState, Padding, Paragraph, Wrap},
 };

 use ratatui_textarea::TextArea;

-use std::io::{self, Read, stdout};
+use std::io::{self, stdout};
 use std::process::ExitCode;
 use std::thread;
 use std::time::Duration;

-use termion::event::{self, Event};
+use termion::event::Key;
+use termion::input::TermRead;
 use termion::raw::IntoRawMode;

 mod nyan_system;
@@ -37,13 +38,23 @@ mod nyan_system;
 use nyan_system::ExecCommandError;

 const BEE_CAT: &str = include_str!("bee_cat.txt");
+const SNAP_CHOOSE_LIST_CAPTION: &str =
+    "Select snapshot to rollback or \"bzz current\" to boot current system state";
+
+const CONFIRM_TEXT1: &str = "You going to roll back system statate to ";
+const CONFIRM_TEXT2: &str = "This action cannot be undone!";
+
+const TICK_TIME_MILLS: u64 = 27u64;
+const WAIT_FOR_F2_SEC: u64 = 3u64;

 //const ROOT_PARTLABEL: &str = "bee-root";
 const ROOT_PARTLABEL: &str = "bee-root";
-const TMP_ROOT: &str = "/mnt/bee_root";
-const TMP_ROOT_SNAPS: &str = "/mnt/bee_root/bzz_snaps";
+const TMP_ROOT: &str = "/mnt/bee-root";
+const TMP_ROOT_SNAPS: &str = "/mnt/bee-root/bzz-snaps";
 const SYS_INIT: &str = "/sbin/init";

+const CURRENT_BOOT_LIST_TEXT: &str = "bzz current";
+
 // fn bee_root_is_present() -> bool {
 //    nyan_system::list_gpt_labeled_devs().iter().filter(|s| s.ends_with(ROOT_PARTLABEL)).count() > 0
 // }
@@ -63,66 +74,76 @@ const SYS_INIT: &str = "/sbin/init";
 //     ExitCode::SUCCESS
 // }

+// #[derive(Debug, PartialEq)]
+// struct RollbackState {
+//     progress: f64,
+//     progress_text: String,
+//     snapshot_date_time: String,
+//     roll_iter: nyan_system::RollBackIterator,
+// }
+// impl RollbackState {
+//     // Constructor function
+//     pub fn new(snaps_list: Vec<String>, snap_date_time: String) -> Self {
+//         RollbackState {
+//             progress: 0.0,
+//             progress_text: "".into(),
+//             snapshot_date_time: snap_date_time.clone(),
+//             roll_iter: nyan_system::RollBackIterator::new(snaps_list, snap_date_time)
+//         }
+//     }
+// }
+
 #[derive(Debug, PartialEq)]
 enum NyanitState {
    Init,
-    WaitForF2(Vec<String>),
-    ChooseSnapshot(Vec<String>),
+    RollBack,
+    ConfirmRollback(String),
+    WaitForF2,
+    /// list of snapshoots
+    ChooseSnapshot,
    EnterPassword,
    Error(String),
-    HandOff(String),
+    HandOff,
 }

-/// Mounting bee-root and chiking if there any snapshots
-fn mount_and_check_snaps(bee_root_dev: &str) -> Result<NyanitState, ExecCommandError> {
-    // mount bee-root
-    nyan_system::mount_bee_root(bee_root_dev, TMP_ROOT)?;
+///
+/// Generates confirm dialog paragraph
+///
+fn gen_conf_par<'a>(snap_dt: String) -> Paragraph<'a> {
+    let first_line = Line::from(vec![Span::raw(CONFIRM_TEXT1), Span::raw(snap_dt).bold()]);
+    let confirm_line = Line::from(vec![
+        Span::raw("Press ("),
+        Span::raw("Y").bold(),
+        Span::raw(") to confirm or ("),
+        Span::raw("N").bold(),
+        Span::raw(") to decline."),
+    ]);

-    // let root_list = nyan_system::list_dir(TMP_ROOT)?;
-    // return Err(ExecCommandError::Other(root_list));
-
-    // list snaps if any
-    let mut snaps_list = nyan_system::list_bzzpss_snaps(TMP_ROOT_SNAPS)?;
-    // if any snaps detected whait for user to press F2
-    if snaps_list.len() > 0 {
-        snaps_list.insert(0, TMP_ROOT.to_string());
-        return Ok(NyanitState::WaitForF2(snaps_list));
-    }
-
-    // else tell to finish boot
-    Ok(NyanitState::HandOff(TMP_ROOT.into()))
-}
-
-fn init_stage() -> Result<(String, NyanitState), ExecCommandError> {
-    // mount sysfss
-    nyan_system::prepare_env().map_err(|ex| format!("prepare_env error: {}", ex))?;
-
-    // get bee-root device name aka /dev/sda1
-    // trying for max 3 sec
-    let bee_root_dev = nyan_system::try_find_partlabel(ROOT_PARTLABEL, 3)
-        .ok_or_else(|| "Timed out trying to find dev by partlabel.".to_string())?;
-
-    // works until this point!!!!
-    // check if device is encrypted
-    if nyan_system::bzzpss_dev_encrypted(&bee_root_dev)
-        .map_err(|ex| format!("Error checking if device is encrypted: {}", ex))?
-    {
-        // if encrypted return EnterPassword so used get promted for pass
-        return Ok((bee_root_dev, NyanitState::EnterPassword));
-    }
-
-    // if unencrypted
-    let check_res = mount_and_check_snaps(&bee_root_dev)?;
-    Ok((bee_root_dev, check_res))
+    let conf_lines: Vec<Line> = vec![
+        first_line,
+        Line::default(),
+        Line::from(CONFIRM_TEXT2).bold(),
+        Line::default(),
+        confirm_line,
+    ];
+    Paragraph::new(conf_lines)
+        .centered()
+        .wrap(Wrap::default())
+        .light_red()
 }

 struct NyanitTUI<'a> {
    exit: bool,
    state: NyanitState,
-    bee_root_dev: String,
+    bee_root_dev: nyan_system::BlkIdRes,
    list_state: ListState,
-    time_counter: u32,
+    /// time counter manly for F2 waiting in mills
+    time_counter: u64,
+    /// time counter manly for F2 waiting in seconds
+    time_counter_sec: u64,
    textarea: Option<TextArea<'a>>,
+    snaps_list: Vec<String>,
+    roll_state: Option<nyan_system::RollBackIterator>,
 }

 impl NyanitTUI<'_> {
@@ -130,20 +151,81 @@ impl NyanitTUI<'_> {
        Ok(Self {
            exit: false,
            state: NyanitState::Init,
-            bee_root_dev: String::new(),
+            bee_root_dev: nyan_system::BlkIdRes {
+                fs_type: String::new(),
+                dev_node: String::new(),
+            },
            list_state: ListState::default().with_selected(Some(0)),
            time_counter: 0,
+            time_counter_sec: 0,
            textarea: None,
+            snaps_list: Vec::new(),
+            roll_state: None,
        })
    }

+    /// Mounting bee-root and chiking if there any snapshots
+    fn mount_and_check_snaps(&mut self) -> Result<NyanitState, ExecCommandError> {
+        // mount bee-root
+        nyan_system::mount_bee_root(&self.bee_root_dev, TMP_ROOT)?;
+
+        // let root_list = nyan_system::list_dir(TMP_ROOT)?;
+        // return Err(ExecCommandError::Other(root_list));
+
+        if self.bee_root_dev.is_bcachefs() {
+            // list snaps if any
+            self.snaps_list = nyan_system::list_bzzpss_snaps(TMP_ROOT_SNAPS)?;
+
+            // if any snaps detected check hive DB update_status
+            if self.snaps_list.len() > 0 {
+                // if pac_lock accessible and exist - rolling back
+                if let Ok(Some(snap_date_time)) = nyan_system::check_pac_lock()
+                    && self.snaps_list.contains(&snap_date_time)
+                {
+                    Ok(NyanitState::ConfirmRollback(snap_date_time))
+                }
+                // else user choose what to do
+                else {
+                    Ok(NyanitState::WaitForF2)
+                }
+            }
+            // else tell to finish boot
+            else {
+                Ok(NyanitState::HandOff)
+            }
+        } else {
+            Ok(NyanitState::HandOff)
+        }
+    }
+
+    fn init_stage(&mut self) -> Result<NyanitState, ExecCommandError> {
+        // mount sysfss
+        nyan_system::prepare_env().map_err(|ex| format!("prepare_env error: {}", ex))?;
+
+        // get bee-root device name aka /dev/sda1
+        // trying for max 3 sec
+        self.bee_root_dev = nyan_system::try_find_partlabel(ROOT_PARTLABEL, 3)
+            .ok_or_else(|| "Timed out trying to find dev by partlabel.".to_string())?;
+
+        if self.bee_root_dev.is_bcachefs() {
+            // check if device is encrypted
+            if nyan_system::bzzpss_dev_encrypted(&self.bee_root_dev.dev_node)
+                .map_err(|ex| format!("Error checking if device is encrypted: {}", ex))?
+            {
+                // if encrypted return EnterPassword so user get promted for pass
+                return Ok(NyanitState::EnterPassword);
+            }
+        }
+
+        // if unencrypted
+        let check_res = self.mount_and_check_snaps()?;
+        Ok(check_res)
+    }
+
    /// runs the application's main loop until the user quits
    pub fn run(&mut self) -> io::Result<()> {
-        self.state = match init_stage() {
-            Ok(res) => {
-                self.bee_root_dev = res.0;
-                res.1
-            }
+        self.state = match self.init_stage() {
+            Ok(res) => res,
            Err(ex) => {
                NyanitState::Error(format!("Error while trying to bzzz-pss things:\n{}", ex))
            }
@@ -152,8 +234,8 @@ impl NyanitTUI<'_> {
        // if drive unencrypted and there is no root snapshots finish boot
        match &self.state {
            // if drive unencrypted and there is no root snapshots finish boot
-            NyanitState::HandOff(root_mnt) => {
-                if let Err(ex) = nyan_system::hand_off_control(root_mnt, SYS_INIT) {
+            NyanitState::HandOff => {
+                if let Err(ex) = nyan_system::hand_off_control(TMP_ROOT, SYS_INIT) {
                    self.state = NyanitState::Error(ex.to_string())
                }
            }
@@ -162,9 +244,13 @@ impl NyanitTUI<'_> {
                let mut textarea: TextArea<'_> = TextArea::default();
                textarea.set_cursor_line_style(Style::default());
                textarea.set_mask_char('\u{1F41D}'); //U+2022 BULLET (•)
-                textarea.set_placeholder_text("Please enter your password");
+                textarea.set_placeholder_text("Please enter your disk unlock password");
                textarea.set_style(Style::default().fg(Color::LightYellow));
-                textarea.set_block(Block::default().borders(Borders::ALL).title("Password"));
+                textarea.set_block(
+                    Block::default()
+                        .borders(Borders::ALL)
+                        .title(" System disk unlock password "),
+                );
                self.textarea = Some(textarea);
            }
            _ => (),
@@ -178,7 +264,7 @@ impl NyanitTUI<'_> {
        let mut terminal = Terminal::new(backend)?;

        // init tty async input and start actually drawing things now!
-        let mut tty_input_async = termion::async_stdin().bytes();
+        let mut tty_input_async = termion::async_stdin().keys();

        self.time_counter = 0;
        while !self.exit {
@@ -223,67 +309,151 @@ impl NyanitTUI<'_> {
        match &self.state {
            NyanitState::Error(ex) => {
                // render big red wolf in the center with err messaghe
-                let err_paragraph = Paragraph::new(ex.as_str()).centered().light_red().bold();
+                let err_paragraph = Paragraph::new(ex.as_str())
+                    .centered()
+                    .wrap(Wrap::default())
+                    .light_red()
+                    .bold();
                frame.render_widget(err_paragraph, vertical_chunks[1]);
            }
-            NyanitState::WaitForF2(_) => {
+            NyanitState::WaitForF2 => {
                // show press F2 for options text
-                let f2_paragraph = Paragraph::new("Press F2 for options")
-                    .centered()
-                    .magenta()
-                    .bold();
+                let f2_lines: Vec<Line> = vec![
+                    Line::from("Press F2 for options"),
+                    Line::default(),
+                    Line::from((WAIT_FOR_F2_SEC.saturating_sub(self.time_counter)).to_string()),
+                ];
+
+                let f2_paragraph = Paragraph::new(f2_lines).centered().magenta().bold();
+
                frame.render_widget(f2_paragraph, vertical_chunks[1]);
            }
-            NyanitState::ChooseSnapshot(snaps_list) => {
-                // render menu for snap choosing
-                frame.render_stateful_widget(
-                    List::new(snaps_list.iter().map(String::as_str))
-                        .block(Block::default().borders(Borders::ALL))
+            NyanitState::ChooseSnapshot => {
+                // 1. Split main chank to make space for description
+                let snap_list_chunks = Layout::vertical([
+                    Constraint::Length(2), // Description test
+                    Constraint::Fill(1),   // to shrink unused space
+                ])
+                .split(vertical_chunks[1]);
+
+                let caption_paragraph = Paragraph::new(SNAP_CHOOSE_LIST_CAPTION)
+                    .centered()
+                    .wrap(Wrap::default())
+                    .light_red()
+                    .bold();
+                frame.render_widget(caption_paragraph, snap_list_chunks[0]);
+
+                // construct items list to get proper text size
+                let mut list_items: Vec<ListItem> = vec![ListItem::new(CURRENT_BOOT_LIST_TEXT)];
+                self.snaps_list
+                    .iter()
+                    .for_each(|s| list_items.push(ListItem::new(s.as_str())));
+
+                let max_width = 2 + list_items.iter().map(|i| i.width()).max().unwrap_or(0) as u16;
+
+                let render_list = List::new(list_items)
                    .highlight_symbol(">>")
-                        .highlight_style(Style::new().bold()),
-                    vertical_chunks[1],
+                    .highlight_style(Style::new().bold().on_light_red());
+
+                frame.render_stateful_widget(
+                    render_list,
+                    snap_list_chunks[1].centered_horizontally(Constraint::Max(max_width)),
                    &mut self.list_state,
                );
            }
-            NyanitState::EnterPassword => {
-                frame.render_widget(self.textarea.as_ref().unwrap(), vertical_chunks[1]);
+            NyanitState::ConfirmRollback(snap_dt) => {
+                let par1 = gen_conf_par(snap_dt.clone());
+                frame.render_widget(par1, vertical_chunks[1]);
            }
-            NyanitState::HandOff(_) => {
+            NyanitState::RollBack => {
+                let centered = vertical_chunks[1].centered_vertically(Constraint::Length(9));
+                // 1. Create the outer block
+                let block = Block::default()
+                    .padding(Padding::proportional(1))
+                    .borders(Borders::ALL)
+                    .light_red()
+                    .title(" Rolling back system state ");
+
+                // 2. Get the inner area of the block
+                let block_inner_area = block.inner(centered);
+
+                frame.render_widget(block, centered);
+
+                // 3. Split the inner area into two parts: top for text, bottom for gauge
+                let chunks = Layout::vertical([
+                    Constraint::Length(3), // gauge
+                    Constraint::Length(1), // spacing
+                    Constraint::Length(1), // Height of the text paragraph
+                ])
+                .split(block_inner_area);
+                let gauge = Gauge::default()
+                    .gauge_style(Style::default().fg(Color::LightRed))
+                    .ratio(self.roll_state.as_ref().unwrap().progress);
+                frame.render_widget(gauge, chunks[0]);
+
+                let text = Paragraph::new(self.roll_state.as_ref().unwrap().progress_text.clone())
+                    .centered();
+                frame.render_widget(text, chunks[2]);
+            }
+            NyanitState::EnterPassword => {
+                frame.render_widget(
+                    self.textarea.as_ref().unwrap(),
+                    vertical_chunks[1]
+                        .centered_vertically(Constraint::Max(3))
+                        .centered_horizontally(Constraint::Percentage(75)),
+                );
+            }
+            NyanitState::HandOff => {
                let ok_text = Paragraph::new("Booting\nKira Linux\n\u{1F41D} \u{1F41D} :3")
-                    .block(Block::bordered().light_green())
+                    .centered()
                    .light_green();
-                frame.render_widget(ok_text, vertical_chunks[1]);
-                // just some time to look at message
+                frame.render_widget(
+                    ok_text,
+                    vertical_chunks[1].centered_vertically(Constraint::Length(3)),
+                );
+                // just some time to look at beez
                thread::sleep(Duration::from_millis(1000))
            }
            _ => (),
        };
    }

-    fn handle_events(&mut self, tty_input: &mut io::Bytes<termion::AsyncReader>) -> io::Result<()> {
+    fn handle_events(
+        &mut self,
+        tty_input: &mut termion::input::Keys<termion::AsyncReader>,
+    ) -> io::Result<()> {
        // cheking if there is any input to read
        if let Some(item) = tty_input.next() {
-            let read_byte = item?;
+            let e = item?;

-            let e = event::parse_event(read_byte, tty_input)?;
            match &self.state {
                // finishing boot
-                NyanitState::HandOff(root_mnt) => {
-                    if let Err(ex) = nyan_system::hand_off_control(root_mnt, SYS_INIT) {
+                // we allways booting to mnt rootnow
+                NyanitState::HandOff => {
+                    if let Err(ex) = nyan_system::hand_off_control(TMP_ROOT, SYS_INIT) {
                        self.state = NyanitState::Error(ex.to_string())
                    }
                }
-                NyanitState::WaitForF2(vol_list) => {
-                    if e == Event::Key(event::Key::F(2)) {
-                        self.state = NyanitState::ChooseSnapshot(vol_list.clone());
+                NyanitState::WaitForF2 => {
+                    if e == Key::F(2) {
+                        self.state = NyanitState::ChooseSnapshot;
                    }
                }
-                NyanitState::ChooseSnapshot(vol_list) => match e {
-                    Event::Key(event::Key::Down) => self.list_state.select_next(),
-                    Event::Key(event::Key::Up) => self.list_state.select_previous(),
-                    Event::Key(event::Key::Char('\n')) => {
+                NyanitState::ChooseSnapshot => match e {
+                    Key::Down => self.list_state.select_next(),
+                    Key::Up => self.list_state.select_previous(),
+                    Key::Char('\n') => {
                        if let Some(idx) = self.list_state.selected() {
-                            self.state = NyanitState::HandOff(vol_list[idx].clone());
+                            // if try to boot into current state
+                            if idx == 0 {
+                                self.state = NyanitState::HandOff;
+                            }
+                            // else we going to restore selected snapshoot as current state
+                            else {
+                                // idx-1 because self.snaps_list do not contains current system, only snapshots date time
+                                self.state =
+                                    NyanitState::ConfirmRollback(self.snaps_list[idx - 1].clone());
+                            }
                        }
                    }
                    _ => (),
@@ -291,14 +461,16 @@ impl NyanitTUI<'_> {
                NyanitState::EnterPassword => {
                    match e {
                        // try to unlock if enter pressed
-                        Event::Key(event::Key::Char('\n')) => {
+                        Key::Char('\n') => {
                            let password = self.textarea.as_ref().unwrap().lines()[0].clone();
-                            match nyan_system::bcachefs_unlock(password, &self.bee_root_dev) {
+                            match nyan_system::bcachefs_unlock(
+                                password,
+                                &self.bee_root_dev.dev_node,
+                            ) {
                                Ok(unlocked) => {
                                    if unlocked {
                                        // need to check for subvolumes and stuff
-                                        self.state = match mount_and_check_snaps(&self.bee_root_dev)
-                                        {
+                                        self.state = match self.mount_and_check_snaps() {
                                            Ok(st) => {
                                                self.time_counter = 0;
                                                st
@@ -333,20 +505,43 @@ impl NyanitTUI<'_> {
                        }
                    }
                }
+                NyanitState::ConfirmRollback(snap_dt) => match e {
+                    Key::Char('Y') | Key::Char('y') => {
+                        self.roll_state = Some(nyan_system::RollBackIterator::new(
+                            self.snaps_list.clone(),
+                            snap_dt.clone(),
+                        ));
+                        self.state = NyanitState::RollBack;
+                    }
+                    Key::Char(_) => self.state = NyanitState::ChooseSnapshot,
+                    _ => (),
+                },
                _ => (),
            }
        } else {
            // Tick time
-            thread::sleep(Duration::from_millis(500));
-
-            if let NyanitState::WaitForF2(_) = self.state {
-                self.time_counter = self.time_counter.wrapping_add(1u32);
-                // 2.5 sec wait
-                if self.time_counter > 5 {
+            thread::sleep(Duration::from_millis(TICK_TIME_MILLS));
+            match self.state {
+                NyanitState::WaitForF2 => {
+                    self.time_counter = self.time_counter.wrapping_add(TICK_TIME_MILLS);
+                    self.time_counter_sec = self.time_counter / 1000;
+                    // wait for F2
+                    if self.time_counter_sec > WAIT_FOR_F2_SEC {
                        // boot from root
-                    self.state = NyanitState::HandOff(TMP_ROOT.into());
+                        self.state = NyanitState::HandOff;
                    }
                }
+                NyanitState::RollBack => match self.roll_state.as_mut().unwrap().next() {
+                    Some(Err(ex)) => {
+                        self.state = NyanitState::Error(format!("ROLL BACK ERROR!: {}", ex));
+                    }
+                    None => {
+                        self.state = NyanitState::HandOff;
+                    }
+                    _ => (),
+                },
+                _ => (),
+            }
        }
        Ok(())
    }
@@ -21,10 +21,29 @@
 use nix;
 use std::fs;
 use std::process::Command;
+use regex_lite::Regex;

-// timeout for block deices population
+
+/// timeout for block deices population
 const WAIT_FOR_BLK_DEVS: u64 = 5u64;

+/// list of subvolumes to move from current system to snapshoot when being restored
+const SBUVOL_TO_MOVE: [(&str, &str); 1] = [("var", "/tmp")];
+
+const TMP_ROOT: &str = "/mnt/bee-root";
+const TMP_ROOT_SNAPS: &str = "/mnt/bee-root/bzz-snaps";
+const TMP_ROOT_USR: &str = "/mnt/bee-root/usr";
+const TMP_ROOT_VAR: &str = "/mnt/bee-root/var";
+
+/// Path where /usr subvolume got moved on snapshot restore
+const TMP_ROOT_SNAPS_USR: &str = "/mnt/bee-root/bzz-snaps/tmp_usr";
+/// Path where /var subvolume got moved on snapshot restore
+const TMP_ROOT_SNAPS_VAR: &str = "/mnt/bee-root/bzz-snaps/tmp_var";
+
+const TMP_ROOT_SNAPS_PREFIX: &str = "/mnt/bee-root/bzz-snaps/tmp_";
+
+const PAC_LOCK_FILE: &str = "/var/lib/hive-up/pac-lock";
+
 #[derive(Debug)]
 pub struct CommandFailed {
    pub stderr: Vec<u8>,
@@ -119,7 +138,28 @@ pub fn exec_command(cmd: &str, args: &Vec<&str>) -> Result<(), ExecCommandError>
    }
 }

-pub fn try_find_partlabel(partlabel: &str, timeout_secs: u64) -> Option<String> {
+
+#[derive(PartialEq)]
+pub struct BlkIdRes {
+    pub fs_type: String,
+    pub dev_node: String,
+}
+
+impl BlkIdRes {
+    pub fn is_bcachefs(&self) -> bool {
+        if self.fs_type == "bcachefs" {
+            true
+        }
+        else {
+            false
+        }
+    }
+}
+
+///
+/// Will block up to timeout_secs
+/// 
+pub fn try_find_partlabel(partlabel: &str, timeout_secs: u64) -> Option<BlkIdRes> {
    use std::{thread, time::Duration};

    let start = std::time::Instant::now();
@@ -134,9 +174,11 @@ pub fn try_find_partlabel(partlabel: &str, timeout_secs: u64) -> Option<String>

 /// Gets device node aka /dev/sda1 from gpr partition label
 /// blkid -s PARTLABEL --match-token PARTLABEL="bzz-primary"
-pub fn find_partlabel(partlabel: &str) -> Result<Option<String>, ExecCommandError> {
+pub fn find_partlabel(partlabel: &str) -> Result<Option<BlkIdRes>, ExecCommandError> {
    let out = Command::new("/usr/bin/blkid")
        .args([
+            "-s",
+            "TYPE",
            "-s",
            "PARTLABEL",
            "-t",
@@ -144,13 +186,18 @@ pub fn find_partlabel(partlabel: &str) -> Result<Option<String>, ExecCommandErro
        ])
        .output()?;
    if out.status.success() {
+        let re = Regex::new(r#"^(/dev/[a-z0-9-]+): TYPE="([a-z]+)" PARTLABEL="[a-z]+"$"#)
+        .unwrap();
        let out_text = String::from_utf8(out.stdout)?;

-        let split_res = out_text.split_once(':').ok_or_else(|| {
-            ExecCommandError::Other(format!("Unexpected blkid output format: \"{}\"", out_text))
-        })?;
-
-        Ok(Some(split_res.0.to_string()))
+        if let Some(captured) = re.captures(&out_text) {
+            // let part_no = captured[1];
+            // let parent_dev = captured[2];
+            let res = BlkIdRes{ fs_type: captured[2].to_string(), dev_node: captured[1].to_string()};
+            Ok(Some(res))
+        } else {
+            Err(ExecCommandError::Other(format!("Unexpected blkid output format: \"{}\"", out_text)))
+        }
    } else {
        if let Some(code) = out.status.code()
            && code == 2
@@ -249,13 +296,16 @@ pub fn bzzpss_dev_encrypted(dev_name: &str) -> Result<bool, ExecCommandError> {
    }
 }

-//const TMP_ROOT: &str = "/mnt/bee-root";
+///
+/// Looking for snapshots in snaps_dir for usr and var
+/// And return list of date-time part of filename if both snapshots exists
+///
 pub fn list_bzzpss_snaps(snaps_dir: &str) -> Result<Vec<String>, ExecCommandError> {
-    use regex::Regex;
    use std::path::Path;

-    // root snapshoot in a form of bzz-yyyy-mm-ddTHH-MM-SS
-    let re = Regex::new(r"^bzz-[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}-[0-9]{2}-[0-9]{2}$").unwrap();
+    // usr or var snapshoot in a form of bzz-usr|var-yyyy-mm-ddTHH-MM-SS
+    let re = Regex::new(r"^bzz-(usr|var)-([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}-[0-9]{2}-[0-9]{2})$")
+        .unwrap();

    let mut res: Vec<String> = Vec::new();
    // if snaps dir path do not exist return empty list
@@ -263,19 +313,339 @@ pub fn list_bzzpss_snaps(snaps_dir: &str) -> Result<Vec<String>, ExecCommandErro
        return Ok(res);
    }

+    // contains only date-time part
+    let mut usr_snaps: Vec<String> = Vec::new();
+    let mut var_snaps: Vec<String> = Vec::new();
+
+    // collect snapshots date-time
    for maybe_entry in fs::read_dir(snaps_dir)? {
        let entry = maybe_entry?;
        if entry.file_type()?.is_dir() {
-            if let Some(dir_name) = entry.file_name().to_str()
-                && re.is_match(dir_name)
-            {
-                res.push(dir_name.to_string());
+            if let Some(dir_name) = entry.file_name().to_str() {
+                if let Some(captured) = re.captures(&dir_name) {
+                    let subvol_name = &captured[1];
+                    let date_time = captured[2].to_string();
+                    if subvol_name == "usr" {
+                        usr_snaps.push(date_time);
+                    } else {
+                        var_snaps.push(date_time);
                    }
                }
            }
+        }
+    }
+    // now we need to make sure snapshots of /usr and /var both exist
+    // just fools safe, may reconsider in future
+    usr_snaps.sort();
+    for snap_time in usr_snaps {
+        if var_snaps.contains(&snap_time) {
+            res.push(snap_time);
+        }
+    }
    Ok(res)
 }

+///
+/// creates rw snapshot of "subvolume" and places it into "target"
+/// bcachefs subvolume snapshot --rw /subvolume /target
+///
+pub fn snapshot_rw(subvolume: &str, target: &str) -> Result<(), ExecCommandError> {
+    exec_command(
+        "bcachefs",
+        &vec!["subvolume", "snapshot", "--rw", subvolume, target],
+    )?;
+
+    Ok(())
+}
+
+///
+/// bcachefs subvolume delete shortcut
+///
+pub fn subvolume_delete(subvolume: &str) -> Result<(), ExecCommandError> {
+    exec_command("bcachefs", &vec!["subvolume", "delete", subvolume])?;
+
+    Ok(())
+}
+
+///
+/// Helper function to get snapshot names in form of "bzz-(usr|var)-date-time"
+/// vol: "usr" or "var"
+/// dt: datetime
+///
+// fn snap_name_from_dt(vol: &str, dt: &str) -> String {
+//     format!("bzz-{}-{}", vol, dt)
+// }
+
+#[derive(Debug, PartialEq)]
+enum RollbackIterStates {
+    Start,
+    RenameUsrVarAct,
+    ChangeToRw,
+    MoveSubvolums,
+    RemoveOldVols,
+    ClearSnaps,
+    Finish,
+    Err,
+}
+
+// 1. Define the iterator struct
+#[derive(Debug, PartialEq)]
+pub struct RollBackIterator {
+    pub progress: f64,
+    pub progress_text: String,
+    snaps_list: Vec<String>,
+    target_snap: String,
+    usr_ro_snap_path: String,
+    var_ro_snap_path: String,
+    state: RollbackIterStates,
+}
+
+impl RollBackIterator {
+    pub fn new(snaps_list: Vec<String>, target_snap: String) -> Self {
+        let usr_ro_snap_path = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", &target_snap);
+        let var_ro_snap_path = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "var", &target_snap);
+        Self {
+            progress: 0.0,
+            progress_text: "Starting...".into(),
+            snaps_list: snaps_list,
+            target_snap: target_snap,
+            usr_ro_snap_path: usr_ro_snap_path,
+            var_ro_snap_path: var_ro_snap_path,
+            state: RollbackIterStates::Start,
+        }
+    }
+}
+
+// 2. Implement Iterator for the iterator struct
+impl Iterator for RollBackIterator {
+    type Item = Result<f64, ExecCommandError>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self.state {
+            RollbackIterStates::Start => {
+                self.state = RollbackIterStates::RenameUsrVarAct;
+                self.progress = 0.0;
+                self.progress_text = "Move usr and var to temporary location".into();
+                Some(Ok(self.progress))
+            }
+            RollbackIterStates::RenameUsrVarAct => {
+                let move_res = fs::rename(TMP_ROOT_USR, TMP_ROOT_SNAPS_USR)
+                    .and_then(|_| fs::rename(TMP_ROOT_VAR, TMP_ROOT_SNAPS_VAR));
+                if let Err(ex) = move_res {
+                    self.state = RollbackIterStates::Err;
+                    Some(Err(ex.into()))
+                } else {
+                    self.state = RollbackIterStates::ChangeToRw;
+                    self.progress_text = "Setting snapshot as current system ...".into();
+                    self.progress = 0.1;
+                    Some(Ok(self.progress))
+                }
+            }
+            RollbackIterStates::ChangeToRw => {
+                let rw_res = snapshot_rw(&self.usr_ro_snap_path, TMP_ROOT_USR)
+                    .and_then(|_| snapshot_rw(&self.var_ro_snap_path, TMP_ROOT_VAR));
+                if let Err(ex) = rw_res {
+                    self.state = RollbackIterStates::Err;
+                    Some(Err(ex))
+                } else {
+                    self.state = RollbackIterStates::MoveSubvolums;
+                    self.progress_text =
+                        "Moving subvolumes from old /usr and /var to new one".into();
+                    self.progress = 0.2;
+                    Some(Ok(self.progress))
+                }
+            }
+            RollbackIterStates::MoveSubvolums => {
+                self.progress = 0.3;
+                self.progress_text = "Removing old /usr and /var".into();
+
+                let mut mv_res = Some(Ok(self.progress));
+                for (vol, svol_path) in SBUVOL_TO_MOVE {
+                    let v_from = format!("{}{}{}", TMP_ROOT_SNAPS_PREFIX, vol, svol_path);
+                    let v_dest = format!("{}/{}{}", TMP_ROOT, vol, svol_path);
+                    if let Err(ex) = fs::rename(v_from, v_dest) {
+                        self.state = RollbackIterStates::Err;
+                        mv_res = Some(Err(ex.into()));
+                        break;
+                    }
+                }
+                self.state = RollbackIterStates::RemoveOldVols;
+                mv_res
+            }
+            RollbackIterStates::RemoveOldVols => {
+                let rem_old_res = subvolume_delete(TMP_ROOT_SNAPS_USR)
+                    .and_then(|_| subvolume_delete(TMP_ROOT_SNAPS_VAR));
+                if let Err(ex) = rem_old_res {
+                    self.state = RollbackIterStates::Err;
+                    Some(Err(ex))
+                } else {
+                    self.state = RollbackIterStates::ClearSnaps;
+                    self.progress_text = "Clearing snapshots...".into();
+                    self.progress = 0.6;
+                    Some(Ok(self.progress))
+                }
+            }
+            RollbackIterStates::ClearSnaps => {
+                self.progress = 1.0;
+                self.progress_text = "All done!".into();
+                let mut clr_snap_res = Some(Ok(self.progress));
+                for snap_date_time in self.snaps_list.iter().rev() {
+                    let usr_snap = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", snap_date_time);
+                    let var_snap = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", snap_date_time);
+                    if let Err(ex) =
+                        subvolume_delete(&usr_snap).and_then(|_| subvolume_delete(&var_snap))
+                    {
+                        clr_snap_res = Some(Err(ex));
+                        self.state = RollbackIterStates::Err;
+                        break;
+                    }
+                    if snap_date_time == &self.target_snap {
+                        self.state = RollbackIterStates::Finish;
+                        break;
+                    }
+                }
+                clr_snap_res
+            }
+            RollbackIterStates::Finish => None,
+            RollbackIterStates::Err => None,
+        }
+    }
+}
+
+// pub fn roll_back_snap(
+//     snaps_list: Vec<String>,
+//     target_snap: String,
+// ) -> impl Iterator<Item = Result<String, ExecCommandError>> {
+//     let usr_ro_snap_path = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", target_snap);
+//     let var_ro_snap_path = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", target_snap);
+
+//     let mut roll_state = RollbackStates::Start;
+
+//     std::iter::from_fn(move || match roll_state {
+//         RollbackStates::Start => {
+//             roll_state = RollbackStates::RenameUsrVarAct;
+//             Some(Ok("Move usr and var to temporary location".into()))
+//         }
+//         RollbackStates::RenameUsrVarAct => {
+//             let move_res = fs::rename(TMP_ROOT_USR, TMP_ROOT_SNAPS_USR)
+//                 .and_then(|_| fs::rename(TMP_ROOT_VAR, TMP_ROOT_SNAPS_VAR));
+//             if let Err(ex) = move_res {
+//                 roll_state = RollbackStates::Err;
+//                 Some(Err(ex.into()))
+//             } else {
+//                 roll_state = RollbackStates::ChangeToRw;
+//                 Some(Ok("Setting snapshot as current system ...".into()))
+//             }
+//         }
+//         RollbackStates::ChangeToRw => {
+//             let rw_res = snapshot_rw(&usr_ro_snap_path, TMP_ROOT_USR)
+//                 .and_then(|_| snapshot_rw(&var_ro_snap_path, TMP_ROOT_VAR));
+//             if let Err(ex) = rw_res {
+//                 roll_state = RollbackStates::Err;
+//                 Some(Err(ex))
+//             } else {
+//                 roll_state = RollbackStates::MoveSubvolums;
+//                 Some(Ok(
+//                     "Moving subvolumes from old /usr and /var to new one".into()
+//                 ))
+//             }
+//         }
+//         RollbackStates::MoveSubvolums => {
+//             let mut mv_res = Some(Ok("Removing old /usr and /var".into()));
+//             for (vol, svol_path) in SBUVOL_TO_MOVE {
+//                 let v_from = format!("{}{}{}", TMP_ROOT_SNAPS_PREFIX, vol, svol_path);
+//                 let v_dest = format!("{}/{}{}", TMP_ROOT, vol, svol_path);
+//                 if let Err(ex) = fs::rename(v_from, v_dest) {
+//                     roll_state = RollbackStates::Err;
+//                     mv_res = Some(Err(ex.into()));
+//                     break;
+//                 }
+//             }
+//             roll_state = RollbackStates::RemoveOldVols;
+//             mv_res
+//         }
+//         RollbackStates::RemoveOldVols => {
+//             let rem_old_res = subvolume_delete(TMP_ROOT_SNAPS_USR)
+//                 .and_then(|_| subvolume_delete(TMP_ROOT_SNAPS_VAR));
+//             if let Err(ex) = rem_old_res {
+//                 roll_state = RollbackStates::Err;
+//                 Some(Err(ex))
+//             } else {
+//                 roll_state = RollbackStates::ClearSnaps;
+//                 Some(Ok("Clearing snapshots...".into()))
+//             }
+//         }
+//         RollbackStates::ClearSnaps => {
+//             let mut clr_snap_res = Some(Ok("All done!".into()));
+//             for snap_date_time in snaps_list.iter().rev() {
+//                 let usr_snap = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", snap_date_time);
+//                 let var_snap = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", snap_date_time);
+//                 if let Err(ex) =
+//                     subvolume_delete(&usr_snap).and_then(|_| subvolume_delete(&var_snap))
+//                 {
+//                     clr_snap_res = Some(Err(ex));
+//                     roll_state = RollbackStates::Err;
+//                     break;
+//                 }
+//                 if snap_date_time == &target_snap {
+//                     break;
+//                 }
+//             }
+//             clr_snap_res
+//         }
+//         RollbackStates::Finish => None,
+//         RollbackStates::Err => None,
+//     })
+
+//     // 1. Rename usr and var to TMP_ROOT_SNAPS/tmp_var|usr
+//     // fs::rename(TMP_ROOT_USR, TMP_ROOT_SNAPS_USR)?;
+//     // fs::rename(TMP_ROOT_VAR, TMP_ROOT_SNAPS_VAR)?;
+
+//     // 2. snapshot desired snaps as RW to /usr and /var
+//     // snapshot_rw(&usr_ro_snap_path, TMP_ROOT_USR)?;
+//     // snapshot_rw(&var_ro_snap_path, TMP_ROOT_VAR)?;
+
+//     // 3. move subvolumes from old /usr and /var
+//     // for (vol, svol_path) in SBUVOL_TO_MOVE {
+//     //     let v_from = format!("{}{}{}", TMP_ROOT_SNAPS_PREFIX, vol, svol_path);
+//     //     let v_dest = format!("{}/{}{}",TMP_ROOT,vol,svol_path);
+//     //     fs::rename(v_from, v_dest)?;
+//     // }
+
+//     // 4. removing tmp /usr /var
+//     // subvolume_delete(TMP_ROOT_SNAPS_USR)?;
+//     // subvolume_delete(TMP_ROOT_SNAPS_VAR)?;
+
+//     // 5. Removing all snapshoots made after one we restored, including inself
+//     // Iterate in reverse untill we get to target_snap in snaps list
+//     // for snap_date_time in snaps_list.iter().rev() {
+//     //     let usr_snap = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", snap_date_time);
+//     //     let var_snap = format!("{}/bzz-{}-{}", TMP_ROOT_SNAPS, "usr", snap_date_time);
+//     //     subvolume_delete(&usr_snap)?;
+//     //     subvolume_delete(&var_snap)?;
+//     //     if snap_date_time == target_snap  {
+//     //         break;
+//     //     }
+//     // }
+
+//     // Ok(())
+// }
+
+///
+/// Checks if pac_lock file exist and returns date-time from it if it does,
+/// Otherwise return None
+///
+pub fn check_pac_lock() -> Result<Option<String>, ExecCommandError> {
+    use std::path::Path;
+    let pac_lock_path = Path::new(PAC_LOCK_FILE);
+    if pac_lock_path.exists() {
+        let snap_dt = fs::read_to_string(pac_lock_path)?;
+        Ok(Some(snap_dt.trim().into()))
+    } else {
+        Ok(None)
+    }
+}
+
 // pulls /sys/class/block
 fn wait_for_block_devices(timeout_secs: u64) -> bool {
    use std::path::Path;
@@ -300,7 +670,6 @@ fn wait_for_block_devices(timeout_secs: u64) -> bool {
    false
 }

-
 // mounting process
 //# Mount essential virtual filesystems
 // mount -t proc none /proc
@@ -351,7 +720,8 @@ pub fn prepare_env() -> Result<(), ExecCommandError> {
    .map_err(|ex| format!("Error mounting /dev: {}", ex.to_string()))?;

    //mount -t tmpfs -o nosuid,nodev,noexec,mode=0755 none /run
-    let run_mount_flags = MsFlags::MS_NOSUID | MsFlags::MS_NODEV | MsFlags::MS_NOEXEC | MsFlags::MS_RELATIME;
+    let run_mount_flags =
+        MsFlags::MS_NOSUID | MsFlags::MS_NODEV | MsFlags::MS_NOEXEC | MsFlags::MS_RELATIME;
    mount(
        Some("run"),
        "/run",
@@ -367,7 +737,6 @@ pub fn prepare_env() -> Result<(), ExecCommandError> {
    // Creating dir for udev so this little shit wont hang
    // fs::create_dir("/run/udev")?;

-
    Ok(())
 }

@@ -400,19 +769,26 @@ pub fn prepare_env() -> Result<(), ExecCommandError> {
 // }

 // # Mount the real root filesystem
-pub fn mount_bee_root(dev_name: &str, mount_point: &str) -> Result<(), ExecCommandError> {
+pub fn mount_bee_root(device: &BlkIdRes, mount_point: &str) -> Result<(), ExecCommandError> {
    use nix::mount::{MsFlags, mount};
    use std::path::Path;

    let root_mount_flags = MsFlags::MS_RDONLY | MsFlags::MS_RELATIME;
    mount(
-        Some(dev_name),
+        Some(device.dev_node.as_str()),
        Path::new(mount_point),
-        Some("bcachefs"),
+        Some(device.fs_type.as_str()),
        root_mount_flags,
        None::<&str>,
    )
-    .map_err(|ex| format!("Error mounting root {} to {} :\n{}",dev_name, mount_point, ex.to_string()))?;
+    .map_err(|ex| {
+        format!(
+            "Error mounting root {} to {} :\n{}",
+            &device.dev_node,
+            mount_point,
+            ex.to_string()
+        )
+    })?;
    // exec_command("/usr/bin/mount", &vec!["-o", "ro", dev_name, mount_point])?;
    Ok(())
 }
Author	SHA256	Message	Date
kira	f388a879ea	Adding ability to handle non bcachefs as root filesystem	2026-09-22 17:25:02 +02:00
kira	63cb87888b	Wrapping UI rework and rollback progress addition.	2026-09-17 23:42:01 +02:00
kira	e4febb1e60	Huge refactor, quicksave	2026-09-17 21:54:20 +02:00
kira	d2ddceb1a2	Switching to regex_lite and s optimization level - 2x binary size reduction.	2026-09-10 00:24:07 +02:00
kira	000c8b94b5	More readme changes	2026-09-07 17:54:05 +02:00
kira	1ce2a8c5e8	Update documantation given nature of snapshots in bcachefs	2026-09-07 17:45:43 +02:00