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use crate::entry::Mode;
impl Mode {
/// Return `true` if this is a sparse entry, as it points to a directory which usually isn't what an 'unsparse' index tracks.
pub fn is_sparse(&self) -> bool {
*self == Self::DIR
}
/// Return `true` if this is a submodule entry.
pub fn is_submodule(&self) -> bool {
*self == Self::DIR | Self::SYMLINK
}
/// Compares this mode to the file system version ([`std::fs::symlink_metadata`])
/// and returns the change needed to update this mode to match the file.
///
/// * if `has_symlinks` is false symlink entries will simply check if there
/// is a normal file on disk
/// * if `executable_bit` is false the executable bit will not be compared
/// `Change::ExecutableBit` will never be generated
///
/// If there is a type change then we will use whatever information is
/// present on the FS. Specifically if `has_symlinks` is false we will
/// never generate `Change::TypeChange { new_mode: Mode::SYMLINK }`. and
/// iff `executable_bit` is false we will never generate `Change::TypeChange
/// { new_mode: Mode::FILE_EXECUTABLE }` (all files are assumed to be not
/// executable). That measn that unstaging and staging files can be a lossy
/// operation on such file systems.
///
/// If a directory replaced a normal file/symlink we assume that the
/// directory is a submodule. Normal (non-submodule) directories would
/// cause a file to be deleted from the index and should be handled before
/// calling this function.
///
/// If the stat information belongs to something other than a normal file/
/// directory (like a socket) we just return an identity change (non-files
/// can not be committed to git).
pub fn change_to_match_fs(
self,
stat: &std::fs::Metadata,
has_symlinks: bool,
executable_bit: bool,
) -> Option<Change> {
match self {
Mode::FILE if !stat.is_file() => (),
Mode::SYMLINK if has_symlinks && !stat.is_symlink() => (),
Mode::SYMLINK if !has_symlinks && !stat.is_file() => (),
Mode::COMMIT | Mode::DIR if !stat.is_dir() => (),
Mode::FILE if executable_bit && gix_fs::is_executable(stat) => return Some(Change::ExecutableBit),
Mode::FILE_EXECUTABLE if executable_bit && !gix_fs::is_executable(stat) => {
return Some(Change::ExecutableBit)
}
_ => return None,
};
let new_mode = if stat.is_dir() {
Mode::COMMIT
} else if executable_bit && gix_fs::is_executable(stat) {
Mode::FILE_EXECUTABLE
} else {
Mode::FILE
};
Some(Change::Type { new_mode })
}
}
/// A change of a [`Mode`].
pub enum Change {
/// The type of mode changed, like symlink => file.
Type {
/// The mode representing the new index type.
new_mode: Mode,
},
/// The executable permission of this file has changed.
ExecutableBit,
}
impl Change {
/// Applies this change to `mode` and returns the changed one.
pub fn apply(self, mode: Mode) -> Mode {
match self {
Change::Type { new_mode } => new_mode,
Change::ExecutableBit => match mode {
Mode::FILE => Mode::FILE_EXECUTABLE,
Mode::FILE_EXECUTABLE => Mode::FILE,
_ => unreachable!("invalid mode change: can't flip executable bit of {mode:?}"),
},
}
}
}
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