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use crate::dirstate_tree::on_disk::DirstateV2ParseError;
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use crate::errors::HgError;
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use bitflags::bitflags;
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use std::convert::{TryFrom, TryInto};
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use std::fs;
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use std::io;
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use std::time::{SystemTime, UNIX_EPOCH};
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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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/// `size` and `mtime.seconds` are truncated to 31 bits.
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///
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/// TODO: double-check status algorithm correctness for files
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/// larger than 2 GiB or modified after 2038.
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#[derive(Debug, Copy, Clone)]
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pub struct DirstateEntry {
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pub(crate) flags: Flags,
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mode_size: Option<(u32, u32)>,
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mtime: Option<TruncatedTimestamp>,
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}
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bitflags! {
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pub(crate) 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_INFO = 1 << 2;
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const HAS_FALLBACK_EXEC = 1 << 3;
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const FALLBACK_EXEC = 1 << 4;
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const HAS_FALLBACK_SYMLINK = 1 << 5;
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const FALLBACK_SYMLINK = 1 << 6;
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}
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}
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/// A Unix timestamp with nanoseconds precision
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#[derive(Debug, Copy, Clone)]
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pub struct TruncatedTimestamp {
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truncated_seconds: u32,
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/// Always in the `0 .. 1_000_000_000` range.
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nanoseconds: u32,
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}
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impl TruncatedTimestamp {
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/// Constructs from a timestamp potentially outside of the supported range,
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/// and truncate the seconds components to its lower 31 bits.
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///
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/// Panics if the nanoseconds components is not in the expected range.
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pub fn new_truncate(seconds: i64, nanoseconds: u32) -> Self {
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assert!(nanoseconds < NSEC_PER_SEC);
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Self {
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truncated_seconds: seconds as u32 & RANGE_MASK_31BIT,
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nanoseconds,
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}
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}
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/// Construct from components. Returns an error if they are not in the
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/// expcted range.
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pub fn from_already_truncated(
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truncated_seconds: u32,
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nanoseconds: u32,
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) -> Result<Self, DirstateV2ParseError> {
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if truncated_seconds & !RANGE_MASK_31BIT == 0
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&& nanoseconds < NSEC_PER_SEC
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{
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Ok(Self {
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truncated_seconds,
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nanoseconds,
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})
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} else {
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Err(DirstateV2ParseError)
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}
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}
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pub fn for_mtime_of(metadata: &fs::Metadata) -> io::Result<Self> {
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#[cfg(unix)]
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{
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use std::os::unix::fs::MetadataExt;
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let seconds = metadata.mtime();
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// i64Â -> u32 with value always in the `0 .. NSEC_PER_SEC` range
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let nanoseconds = metadata.mtime_nsec().try_into().unwrap();
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Ok(Self::new_truncate(seconds, nanoseconds))
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}
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#[cfg(not(unix))]
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{
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metadata.modified().map(Self::from)
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}
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}
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/// The lower 31 bits of the number of seconds since the epoch.
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pub fn truncated_seconds(&self) -> u32 {
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self.truncated_seconds
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}
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/// The sub-second component of this timestamp, in nanoseconds.
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/// Always in the `0 .. 1_000_000_000` range.
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///
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/// This timestamp is after `(seconds, 0)` by this many nanoseconds.
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pub fn nanoseconds(&self) -> u32 {
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self.nanoseconds
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}
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/// Returns whether two timestamps are equal modulo 2**31 seconds.
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///
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/// If this returns `true`, the original values converted from `SystemTime`
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/// or given to `new_truncate` were very likely equal. A false positive is
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/// possible if they were exactly a multiple of 2**31 seconds apart (around
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/// 68 years). This is deemed very unlikely to happen by chance, especially
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/// on filesystems that support sub-second precision.
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///
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/// If someone is manipulating the modification times of some files to
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/// intentionally make `hg status` return incorrect results, not truncating
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/// wouldn’t help much since they can set exactly the expected timestamp.
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///
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/// Sub-second precision is ignored if it is zero in either value.
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/// Some APIs simply return zero when more precision is not available.
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/// When comparing values from different sources, if only one is truncated
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/// in that way, doing a simple comparison would cause many false
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/// negatives.
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pub fn likely_equal(self, other: Self) -> bool {
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self.truncated_seconds == other.truncated_seconds
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&& (self.nanoseconds == other.nanoseconds
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|| self.nanoseconds == 0
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|| other.nanoseconds == 0)
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}
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pub fn likely_equal_to_mtime_of(
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self,
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metadata: &fs::Metadata,
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) -> io::Result<bool> {
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Ok(self.likely_equal(Self::for_mtime_of(metadata)?))
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}
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}
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impl From<SystemTime> for TruncatedTimestamp {
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fn from(system_time: SystemTime) -> Self {
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// On Unix, `SystemTime` is a wrapper for the `timespec` C struct:
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// https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec
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// We want to effectively access its fields, but the Rust standard
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// library does not expose them. The best we can do is:
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let seconds;
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let nanoseconds;
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match system_time.duration_since(UNIX_EPOCH) {
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Ok(duration) => {
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seconds = duration.as_secs() as i64;
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nanoseconds = duration.subsec_nanos();
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}
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Err(error) => {
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// `system_time` is before `UNIX_EPOCH`.
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// We need to undo this algorithm:
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// https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41
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let negative = error.duration();
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let negative_secs = negative.as_secs() as i64;
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let negative_nanos = negative.subsec_nanos();
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if negative_nanos == 0 {
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seconds = -negative_secs;
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nanoseconds = 0;
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} else {
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// For example if `system_time` was 4.3Â seconds before
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// the Unix epoch we get a Duration that represents
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// `(-4, -0.3)` but we want `(-5, +0.7)`:
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seconds = -1 - negative_secs;
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nanoseconds = NSEC_PER_SEC - negative_nanos;
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}
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}
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};
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Self::new_truncate(seconds, nanoseconds)
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}
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}
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const NSEC_PER_SEC: u32 = 1_000_000_000;
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const RANGE_MASK_31BIT: u32 = 0x7FFF_FFFF;
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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 from_v2_data(
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wdir_tracked: bool,
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p1_tracked: bool,
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p2_info: bool,
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mode_size: Option<(u32, u32)>,
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mtime: Option<TruncatedTimestamp>,
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fallback_exec: Option<bool>,
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fallback_symlink: Option<bool>,
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) -> Self {
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if let Some((mode, size)) = mode_size {
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// TODO: return an error for out of range values?
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assert!(mode & !RANGE_MASK_31BIT == 0);
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assert!(size & !RANGE_MASK_31BIT == 0);
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}
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let mut flags = Flags::empty();
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flags.set(Flags::WDIR_TRACKED, wdir_tracked);
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flags.set(Flags::P1_TRACKED, p1_tracked);
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flags.set(Flags::P2_INFO, p2_info);
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if let Some(exec) = fallback_exec {
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flags.insert(Flags::HAS_FALLBACK_EXEC);
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if exec {
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flags.insert(Flags::FALLBACK_EXEC);
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}
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}
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if let Some(exec) = fallback_symlink {
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flags.insert(Flags::HAS_FALLBACK_SYMLINK);
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if exec {
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flags.insert(Flags::FALLBACK_SYMLINK);
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}
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}
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Self {
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flags,
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mode_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 {
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// might be missing P1_TRACKED
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flags: Flags::WDIR_TRACKED | Flags::P2_INFO,
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mode_size: None,
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mtime: None,
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}
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} else if size == SIZE_NON_NORMAL {
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Self {
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flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED,
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mode_size: None,
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mtime: None,
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}
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} else if mtime == MTIME_UNSET {
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// TODO:Â return an error for negative values?
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let mode = u32::try_from(mode).unwrap();
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let size = u32::try_from(size).unwrap();
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Self {
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flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED,
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mode_size: Some((mode, size)),
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mtime: None,
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}
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} else {
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// TODO:Â return an error for negative values?
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let mode = u32::try_from(mode).unwrap();
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let size = u32::try_from(size).unwrap();
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let mtime = u32::try_from(mtime).unwrap();
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let mtime =
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TruncatedTimestamp::from_already_truncated(mtime, 0)
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.unwrap();
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Self {
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flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED,
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mode_size: Some((mode, size)),
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mtime: Some(mtime),
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}
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}
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}
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EntryState::Added => Self {
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flags: Flags::WDIR_TRACKED,
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mode_size: None,
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mtime: None,
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},
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EntryState::Removed => Self {
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flags: if size == SIZE_NON_NORMAL {
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Flags::P1_TRACKED | Flags::P2_INFO
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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_INFO
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} else {
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Flags::P1_TRACKED
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},
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mode_size: None,
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mtime: None,
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},
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EntryState::Merged => 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_INFO, // might not be true because of rename ?
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mode_size: None,
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mtime: None,
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},
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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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pub fn p1_tracked(&self) -> bool {
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self.flags.contains(Flags::P1_TRACKED)
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}
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fn in_either_parent(&self) -> bool {
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self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO)
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}
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pub fn removed(&self) -> bool {
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self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED)
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}
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pub fn p2_info(&self) -> bool {
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self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO)
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}
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pub fn added(&self) -> bool {
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self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent()
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}
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pub fn maybe_clean(&self) -> bool {
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if !self.flags.contains(Flags::WDIR_TRACKED) {
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false
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} else if !self.flags.contains(Flags::P1_TRACKED) {
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false
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} else if self.flags.contains(Flags::P2_INFO) {
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false
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} else {
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true
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}
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}
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pub fn any_tracked(&self) -> bool {
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self.flags.intersects(
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Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO,
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)
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}
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/// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)`
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pub(crate) fn v2_data(
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&self,
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) -> (
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bool,
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bool,
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bool,
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Option<(u32, u32)>,
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Option<TruncatedTimestamp>,
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Option<bool>,
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Option<bool>,
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) {
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if !self.any_tracked() {
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// TODO: return an Option instead?
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panic!("Accessing v1_state of an untracked DirstateEntry")
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}
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let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED);
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let p1_tracked = self.flags.contains(Flags::P1_TRACKED);
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let p2_info = self.flags.contains(Flags::P2_INFO);
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let mode_size = self.mode_size;
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let mtime = self.mtime;
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(
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wdir_tracked,
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p1_tracked,
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p2_info,
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mode_size,
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mtime,
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self.get_fallback_exec(),
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self.get_fallback_symlink(),
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)
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}
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fn v1_state(&self) -> EntryState {
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if !self.any_tracked() {
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// TODO: return an Option instead?
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panic!("Accessing v1_state of an untracked DirstateEntry")
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}
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if self.removed() {
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EntryState::Removed
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} else if self
|
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|
.flags
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.contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO)
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{
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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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fn v1_mode(&self) -> i32 {
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if let Some((mode, _size)) = self.mode_size {
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i32::try_from(mode).unwrap()
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} else {
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0
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}
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}
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|
|
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fn v1_size(&self) -> i32 {
|
|
|
if !self.any_tracked() {
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|
// TODO: return an Option instead?
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|
panic!("Accessing v1_size of an untracked DirstateEntry")
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|
}
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|
|
if self.removed()
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|
&& self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO)
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{
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SIZE_NON_NORMAL
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} else if self.flags.contains(Flags::P2_INFO) {
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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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|
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} else if self.added() {
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|
SIZE_NON_NORMAL
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|
} else if let Some((_mode, size)) = self.mode_size {
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|
|
i32::try_from(size).unwrap()
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|
} else {
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|
SIZE_NON_NORMAL
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|
}
|
|
|
}
|
|
|
|
|
|
fn v1_mtime(&self) -> i32 {
|
|
|
if !self.any_tracked() {
|
|
|
// TODO: return an Option instead?
|
|
|
panic!("Accessing v1_mtime of an untracked DirstateEntry")
|
|
|
}
|
|
|
if self.removed() {
|
|
|
0
|
|
|
} else if self.flags.contains(Flags::P2_INFO) {
|
|
|
MTIME_UNSET
|
|
|
} else if !self.flags.contains(Flags::P1_TRACKED) {
|
|
|
MTIME_UNSET
|
|
|
} else if let Some(mtime) = self.mtime {
|
|
|
i32::try_from(mtime.truncated_seconds()).unwrap()
|
|
|
} else {
|
|
|
MTIME_UNSET
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// TODO: return `Option<EntryState>`? None when `!self.any_tracked`
|
|
|
pub fn state(&self) -> EntryState {
|
|
|
self.v1_state()
|
|
|
}
|
|
|
|
|
|
// TODO: return Option?
|
|
|
pub fn mode(&self) -> i32 {
|
|
|
self.v1_mode()
|
|
|
}
|
|
|
|
|
|
// TODO: return Option?
|
|
|
pub fn size(&self) -> i32 {
|
|
|
self.v1_size()
|
|
|
}
|
|
|
|
|
|
// TODO: return Option?
|
|
|
pub fn mtime(&self) -> i32 {
|
|
|
self.v1_mtime()
|
|
|
}
|
|
|
|
|
|
pub fn get_fallback_exec(&self) -> Option<bool> {
|
|
|
if self.flags.contains(Flags::HAS_FALLBACK_EXEC) {
|
|
|
Some(self.flags.contains(Flags::FALLBACK_EXEC))
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn set_fallback_exec(&mut self, value: Option<bool>) {
|
|
|
match value {
|
|
|
None => {
|
|
|
self.flags.remove(Flags::HAS_FALLBACK_EXEC);
|
|
|
self.flags.remove(Flags::FALLBACK_EXEC);
|
|
|
}
|
|
|
Some(exec) => {
|
|
|
self.flags.insert(Flags::HAS_FALLBACK_EXEC);
|
|
|
if exec {
|
|
|
self.flags.insert(Flags::FALLBACK_EXEC);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn get_fallback_symlink(&self) -> Option<bool> {
|
|
|
if self.flags.contains(Flags::HAS_FALLBACK_SYMLINK) {
|
|
|
Some(self.flags.contains(Flags::FALLBACK_SYMLINK))
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn set_fallback_symlink(&mut self, value: Option<bool>) {
|
|
|
match value {
|
|
|
None => {
|
|
|
self.flags.remove(Flags::HAS_FALLBACK_SYMLINK);
|
|
|
self.flags.remove(Flags::FALLBACK_SYMLINK);
|
|
|
}
|
|
|
Some(symlink) => {
|
|
|
self.flags.insert(Flags::HAS_FALLBACK_SYMLINK);
|
|
|
if symlink {
|
|
|
self.flags.insert(Flags::FALLBACK_SYMLINK);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn truncated_mtime(&self) -> Option<TruncatedTimestamp> {
|
|
|
self.mtime
|
|
|
}
|
|
|
|
|
|
pub fn drop_merge_data(&mut self) {
|
|
|
if self.flags.contains(Flags::P2_INFO) {
|
|
|
self.flags.remove(Flags::P2_INFO);
|
|
|
self.mode_size = None;
|
|
|
self.mtime = None;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn set_possibly_dirty(&mut self) {
|
|
|
self.mtime = None
|
|
|
}
|
|
|
|
|
|
pub fn set_clean(
|
|
|
&mut self,
|
|
|
mode: u32,
|
|
|
size: u32,
|
|
|
mtime: TruncatedTimestamp,
|
|
|
) {
|
|
|
let size = size & RANGE_MASK_31BIT;
|
|
|
self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED);
|
|
|
self.mode_size = Some((mode, size));
|
|
|
self.mtime = Some(mtime);
|
|
|
}
|
|
|
|
|
|
pub fn set_tracked(&mut self) {
|
|
|
self.flags.insert(Flags::WDIR_TRACKED);
|
|
|
// `set_tracked` is replacing various `normallookup` call. So we mark
|
|
|
// the files as needing lookup
|
|
|
//
|
|
|
// Consider dropping this in the future in favor of something less
|
|
|
// broad.
|
|
|
self.mtime = None;
|
|
|
}
|
|
|
|
|
|
pub fn set_untracked(&mut self) {
|
|
|
self.flags.remove(Flags::WDIR_TRACKED);
|
|
|
self.mode_size = None;
|
|
|
self.mtime = None;
|
|
|
}
|
|
|
|
|
|
/// Returns `(state, mode, size, mtime)` for the puprose of serialization
|
|
|
/// in the dirstate-v1 format.
|
|
|
///
|
|
|
/// This includes marker values such as `mtime == -1`. In the future we may
|
|
|
/// want to not represent these cases that way in memory, but serialization
|
|
|
/// will need to keep the same format.
|
|
|
pub fn v1_data(&self) -> (u8, i32, i32, i32) {
|
|
|
(
|
|
|
self.v1_state().into(),
|
|
|
self.v1_mode(),
|
|
|
self.v1_size(),
|
|
|
self.v1_mtime(),
|
|
|
)
|
|
|
}
|
|
|
|
|
|
pub(crate) fn is_from_other_parent(&self) -> bool {
|
|
|
self.state() == EntryState::Normal
|
|
|
&& self.size() == SIZE_FROM_OTHER_PARENT
|
|
|
}
|
|
|
|
|
|
// TODO: other platforms
|
|
|
#[cfg(unix)]
|
|
|
pub fn mode_changed(
|
|
|
&self,
|
|
|
filesystem_metadata: &std::fs::Metadata,
|
|
|
) -> bool {
|
|
|
let dirstate_exec_bit = (self.mode() as u32 & EXEC_BIT_MASK) != 0;
|
|
|
let fs_exec_bit = has_exec_bit(filesystem_metadata);
|
|
|
dirstate_exec_bit != fs_exec_bit
|
|
|
}
|
|
|
|
|
|
/// Returns a `(state, mode, size, mtime)` tuple as for
|
|
|
/// `DirstateMapMethods::debug_iter`.
|
|
|
pub fn debug_tuple(&self) -> (u8, i32, i32, i32) {
|
|
|
(self.state().into(), self.mode(), self.size(), self.mtime())
|
|
|
}
|
|
|
|
|
|
/// True if the stored mtime would be ambiguous with the current time
|
|
|
pub fn need_delay(&self, now: TruncatedTimestamp) -> bool {
|
|
|
if let Some(mtime) = self.mtime {
|
|
|
self.state() == EntryState::Normal
|
|
|
&& mtime.truncated_seconds() == now.truncated_seconds()
|
|
|
} else {
|
|
|
false
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl EntryState {
|
|
|
pub fn is_tracked(self) -> bool {
|
|
|
use EntryState::*;
|
|
|
match self {
|
|
|
Normal | Added | Merged => true,
|
|
|
Removed => false,
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl TryFrom<u8> for EntryState {
|
|
|
type Error = HgError;
|
|
|
|
|
|
fn try_from(value: u8) -> Result<Self, Self::Error> {
|
|
|
match value {
|
|
|
b'n' => Ok(EntryState::Normal),
|
|
|
b'a' => Ok(EntryState::Added),
|
|
|
b'r' => Ok(EntryState::Removed),
|
|
|
b'm' => Ok(EntryState::Merged),
|
|
|
_ => Err(HgError::CorruptedRepository(format!(
|
|
|
"Incorrect dirstate entry state {}",
|
|
|
value
|
|
|
))),
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl Into<u8> for EntryState {
|
|
|
fn into(self) -> u8 {
|
|
|
match self {
|
|
|
EntryState::Normal => b'n',
|
|
|
EntryState::Added => b'a',
|
|
|
EntryState::Removed => b'r',
|
|
|
EntryState::Merged => b'm',
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
const EXEC_BIT_MASK: u32 = 0o100;
|
|
|
|
|
|
pub fn has_exec_bit(metadata: &std::fs::Metadata) -> bool {
|
|
|
// TODO: How to handle executable permissions on Windows?
|
|
|
use std::os::unix::fs::MetadataExt;
|
|
|
(metadata.mode() & EXEC_BIT_MASK) != 0
|
|
|
}
|
|
|
|
