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use crate::errors::HgError;
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use bitflags::bitflags;
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use std::convert::TryFrom;
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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pub enum EntryState {
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Normal,
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Added,
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Removed,
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Merged,
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}
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/// The C implementation uses all signed types. This will be an issue
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/// either when 4GB+ source files are commonplace or in 2038, whichever
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/// comes first.
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#[derive(Debug, PartialEq, Copy, Clone)]
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pub struct DirstateEntry {
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flags: Flags,
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mode: i32,
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size: i32,
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mtime: i32,
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}
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bitflags! {
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pub struct Flags: u8 {
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const WDIR_TRACKED = 1 << 0;
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const P1_TRACKED = 1 << 1;
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const P2_TRACKED = 1 << 2;
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const POSSIBLY_DIRTY = 1 << 3;
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const MERGED = 1 << 4;
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const CLEAN_P1 = 1 << 5;
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const CLEAN_P2 = 1 << 6;
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const ENTRYLESS_TREE_NODE = 1 << 7;
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}
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}
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pub const V1_RANGEMASK: i32 = 0x7FFFFFFF;
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pub const MTIME_UNSET: i32 = -1;
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/// A `DirstateEntry` with a size of `-2` means that it was merged from the
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/// other parent. This allows revert to pick the right status back during a
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/// merge.
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pub const SIZE_FROM_OTHER_PARENT: i32 = -2;
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/// A special value used for internal representation of special case in
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/// dirstate v1 format.
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pub const SIZE_NON_NORMAL: i32 = -1;
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impl DirstateEntry {
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pub fn new(
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flags: Flags,
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mode_size_mtime: Option<(i32, i32, i32)>,
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) -> Self {
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let (mode, size, mtime) =
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mode_size_mtime.unwrap_or((0, SIZE_NON_NORMAL, MTIME_UNSET));
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Self {
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flags,
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mode,
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size,
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mtime,
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}
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}
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pub fn from_v1_data(
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state: EntryState,
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mode: i32,
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size: i32,
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mtime: i32,
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) -> Self {
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match state {
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EntryState::Normal => {
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if size == SIZE_FROM_OTHER_PARENT {
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Self::new_from_p2()
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} else if size == SIZE_NON_NORMAL {
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Self::new_possibly_dirty()
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} else if mtime == MTIME_UNSET {
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Self {
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flags: Flags::WDIR_TRACKED
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| Flags::P1_TRACKED
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| Flags::POSSIBLY_DIRTY,
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mode,
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size,
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mtime: 0,
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}
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} else {
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Self::new_normal(mode, size, mtime)
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}
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}
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EntryState::Added => Self::new_added(),
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EntryState::Removed => Self {
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flags: if size == SIZE_NON_NORMAL {
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Flags::P1_TRACKED // might not be true because of rename ?
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| Flags::P2_TRACKED // might not be true because of rename ?
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| Flags::MERGED
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} else if size == SIZE_FROM_OTHER_PARENT {
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// We don’t know if P1_TRACKED should be set (file history)
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Flags::P2_TRACKED | Flags::CLEAN_P2
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} else {
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Flags::P1_TRACKED
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},
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mode: 0,
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size: 0,
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mtime: 0,
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},
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EntryState::Merged => Self::new_merged(),
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}
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}
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pub fn new_from_p2() -> Self {
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Self {
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// might be missing P1_TRACKED
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flags: Flags::WDIR_TRACKED | Flags::P2_TRACKED | Flags::CLEAN_P2,
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mode: 0,
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size: SIZE_FROM_OTHER_PARENT,
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mtime: MTIME_UNSET,
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}
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}
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pub fn new_possibly_dirty() -> Self {
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Self {
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flags: Flags::WDIR_TRACKED
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| Flags::P1_TRACKED
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| Flags::POSSIBLY_DIRTY,
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mode: 0,
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size: SIZE_NON_NORMAL,
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mtime: MTIME_UNSET,
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}
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}
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pub fn new_added() -> Self {
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Self {
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flags: Flags::WDIR_TRACKED,
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mode: 0,
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size: SIZE_NON_NORMAL,
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mtime: MTIME_UNSET,
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}
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}
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pub fn new_merged() -> Self {
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Self {
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flags: Flags::WDIR_TRACKED
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| Flags::P1_TRACKED // might not be true because of rename ?
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| Flags::P2_TRACKED // might not be true because of rename ?
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| Flags::MERGED,
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mode: 0,
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size: SIZE_NON_NORMAL,
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mtime: MTIME_UNSET,
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}
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}
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pub fn new_normal(mode: i32, size: i32, mtime: i32) -> Self {
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Self {
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flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED,
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mode,
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size,
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mtime,
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}
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}
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/// Creates a new entry in "removed" state.
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///
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/// `size` is expected to be zero, `SIZE_NON_NORMAL`, or
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/// `SIZE_FROM_OTHER_PARENT`
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pub fn new_removed(size: i32) -> Self {
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Self::from_v1_data(EntryState::Removed, 0, size, 0)
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}
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pub fn tracked(&self) -> bool {
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self.flags.contains(Flags::WDIR_TRACKED)
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}
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fn tracked_in_any_parent(&self) -> bool {
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self.flags.intersects(Flags::P1_TRACKED | Flags::P2_TRACKED)
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}
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pub fn removed(&self) -> bool {
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self.tracked_in_any_parent()
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&& !self.flags.contains(Flags::WDIR_TRACKED)
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}
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pub fn merged(&self) -> bool {
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self.flags.contains(Flags::WDIR_TRACKED | Flags::MERGED)
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}
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pub fn added(&self) -> bool {
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self.flags.contains(Flags::WDIR_TRACKED)
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&& !self.tracked_in_any_parent()
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}
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pub fn from_p2(&self) -> bool {
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self.flags.contains(Flags::WDIR_TRACKED | Flags::CLEAN_P2)
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}
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pub fn state(&self) -> EntryState {
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if self.removed() {
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EntryState::Removed
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} else if self.merged() {
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EntryState::Merged
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} else if self.added() {
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EntryState::Added
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} else {
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EntryState::Normal
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}
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}
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pub fn mode(&self) -> i32 {
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self.mode
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}
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pub fn size(&self) -> i32 {
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if self.removed() && self.flags.contains(Flags::MERGED) {
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SIZE_NON_NORMAL
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} else if self.removed() && self.flags.contains(Flags::CLEAN_P2) {
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SIZE_FROM_OTHER_PARENT
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} else if self.removed() {
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0
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} else if self.merged() {
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SIZE_FROM_OTHER_PARENT
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} else if self.added() {
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SIZE_NON_NORMAL
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} else if self.from_p2() {
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SIZE_FROM_OTHER_PARENT
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} else if self.flags.contains(Flags::POSSIBLY_DIRTY) {
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self.size // TODO: SIZE_NON_NORMAL ?
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} else {
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self.size
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}
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}
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pub fn mtime(&self) -> i32 {
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if self.removed() {
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0
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} else if self.flags.contains(Flags::POSSIBLY_DIRTY) {
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MTIME_UNSET
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} else if self.merged() {
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MTIME_UNSET
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} else if self.added() {
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MTIME_UNSET
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} else if self.from_p2() {
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MTIME_UNSET
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} else {
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self.mtime
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}
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}
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pub fn set_possibly_dirty(&mut self) {
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self.flags.insert(Flags::POSSIBLY_DIRTY)
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}
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pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) {
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self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED);
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self.flags.remove(
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Flags::P2_TRACKED // This might be wrong
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| Flags::MERGED
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| Flags::CLEAN_P2
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| Flags::POSSIBLY_DIRTY,
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);
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self.mode = mode;
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self.size = size;
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self.mtime = mtime;
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}
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pub fn set_tracked(&mut self) {
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self.flags
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.insert(Flags::WDIR_TRACKED | Flags::POSSIBLY_DIRTY);
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// size = None on the python size turn into size = NON_NORMAL when
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// accessed. So the next line is currently required, but a some future
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// clean up would be welcome.
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self.size = SIZE_NON_NORMAL;
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}
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pub fn set_untracked(&mut self) {
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self.flags.remove(Flags::WDIR_TRACKED);
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self.mode = 0;
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self.size = 0;
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self.mtime = 0;
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}
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/// Returns `(state, mode, size, mtime)` for the puprose of serialization
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/// in the dirstate-v1 format.
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///
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/// This includes marker values such as `mtime == -1`. In the future we may
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/// want to not represent these cases that way in memory, but serialization
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/// will need to keep the same format.
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pub fn v1_data(&self) -> (u8, i32, i32, i32) {
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(self.state().into(), self.mode(), self.size(), self.mtime())
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}
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pub(crate) fn is_from_other_parent(&self) -> bool {
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self.state() == EntryState::Normal
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&& self.size() == SIZE_FROM_OTHER_PARENT
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}
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// TODO: other platforms
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#[cfg(unix)]
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pub fn mode_changed(
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&self,
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filesystem_metadata: &std::fs::Metadata,
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) -> bool {
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use std::os::unix::fs::MetadataExt;
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const EXEC_BIT_MASK: u32 = 0o100;
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let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK;
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let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK;
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dirstate_exec_bit != fs_exec_bit
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}
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/// Returns a `(state, mode, size, mtime)` tuple as for
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/// `DirstateMapMethods::debug_iter`.
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pub fn debug_tuple(&self) -> (u8, i32, i32, i32) {
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let state = if self.flags.contains(Flags::ENTRYLESS_TREE_NODE) {
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b' '
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} else {
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self.state().into()
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};
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(state, self.mode(), self.size(), self.mtime())
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}
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pub fn mtime_is_ambiguous(&self, now: i32) -> bool {
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self.state() == EntryState::Normal && self.mtime() == now
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}
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pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool {
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let ambiguous = self.mtime_is_ambiguous(now);
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if ambiguous {
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// The file was last modified "simultaneously" with the current
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// write to dirstate (i.e. within the same second for file-
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// systems with a granularity of 1 sec). This commonly happens
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// for at least a couple of files on 'update'.
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// The user could change the file without changing its size
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// within the same second. Invalidate the file's mtime in
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// dirstate, forcing future 'status' calls to compare the
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// contents of the file if the size is the same. This prevents
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// mistakenly treating such files as clean.
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self.clear_mtime()
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}
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ambiguous
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}
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pub fn clear_mtime(&mut self) {
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self.mtime = -1;
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}
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}
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impl EntryState {
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pub fn is_tracked(self) -> bool {
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use EntryState::*;
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match self {
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Normal | Added | Merged => true,
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Removed => false,
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}
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}
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}
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impl TryFrom<u8> for EntryState {
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type Error = HgError;
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fn try_from(value: u8) -> Result<Self, Self::Error> {
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match value {
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b'n' => Ok(EntryState::Normal),
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b'a' => Ok(EntryState::Added),
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b'r' => Ok(EntryState::Removed),
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b'm' => Ok(EntryState::Merged),
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_ => Err(HgError::CorruptedRepository(format!(
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"Incorrect dirstate entry state {}",
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value
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))),
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}
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}
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}
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impl Into<u8> for EntryState {
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fn into(self) -> u8 {
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match self {
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EntryState::Normal => b'n',
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EntryState::Added => b'a',
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EntryState::Removed => b'r',
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EntryState::Merged => b'm',
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}
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}
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}
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