use std::{convert::TryFrom, path::PathBuf}; use crate::repository;use git_config::{Boolean, Integer}; use super::{Cache, Error};use crate::bstr::ByteSlice;use crate::repository::identity; /// A utility to deal with the cyclic dependency between the ref store and the configuration. The ref-store needs the/// object hash kind, and the configuration needs the current branch name to resolve conditional includes with `onbranch`.#[allow(dead_code)]pub(crate) struct StageOne {    git_dir_config: git_config::File<'static>,    buf: Vec<u8>,     is_bare: bool,    lossy: Option<bool>,    pub object_hash: git_hash::Kind,    pub reflog: Option<git_ref::store::WriteReflog>,} /// Initializationimpl StageOne {    pub fn new(git_dir: &std::path::Path, git_dir_trust: git_sec::Trust, lossy: Option<bool>) -> Result<Self, Error> {        let mut buf = Vec::with_capacity(512);        let config = {            let config_path = git_dir.join("config");            std::io::copy(&mut std::fs::File::open(&config_path)?, &mut buf)?;             git_config::File::from_bytes_owned(                &mut buf,                git_config::file::Metadata::from(git_config::Source::Local)                    .at(config_path)                    .with(git_dir_trust),                git_config::file::init::Options {                    includes: git_config::file::includes::Options::no_follow(),                    ..base_options(lossy)                },            )?        };         let is_bare = config_bool(&config, "core.bare", false)?;        let repo_format_version = config            .value::<Integer>("core", None, "repositoryFormatVersion")            .map_or(0, |v| v.to_decimal().unwrap_or_default());        let object_hash = (repo_format_version != 1)            .then(|| Ok(git_hash::Kind::Sha1))            .or_else(|| {                config.string("extensions", None, "objectFormat").map(|format| {                    if format.as_ref().eq_ignore_ascii_case(b"sha1") {                        Ok(git_hash::Kind::Sha1)                    } else {                        Err(Error::UnsupportedObjectFormat {                            name: format.to_vec().into(),                        })                    }                })            })            .transpose()?            .unwrap_or(git_hash::Kind::Sha1);         let reflog = query_refupdates(&config);        Ok(StageOne {            git_dir_config: config,            buf,            is_bare,            lossy,            object_hash,            reflog,        })    }} /// Initializationimpl Cache {    #[allow(clippy::too_many_arguments)]    pub fn from_stage_one(        StageOne {            git_dir_config,            mut buf,            lossy,            is_bare,            object_hash,            reflog: _,        }: StageOne,        git_dir: &std::path::Path,        branch_name: Option<&git_ref::FullNameRef>,        mut filter_config_section: fn(&git_config::file::Metadata) -> bool,        git_install_dir: Option<&std::path::Path>,        home: Option<&std::path::Path>,        repository::permissions::Environment {            git_prefix,            home: home_env,            xdg_config_home: xdg_config_home_env,        }: repository::permissions::Environment,        repository::permissions::Config {            system: use_system,            git: use_git,            user: use_user,            env: use_env,            includes: use_includes,        }: repository::permissions::Config,    ) -> Result<Self, Error> {        let options = git_config::file::init::Options {            includes: if use_includes {                git_config::file::includes::Options::follow(                    interpolate_context(git_install_dir, home),                    git_config::file::includes::conditional::Context {                        git_dir: git_dir.into(),                        branch_name,                    },                )            } else {                git_config::file::includes::Options::no_follow()            },            ..base_options(lossy)        };         let config = {            let home_env = &home_env;            let xdg_config_home_env = &xdg_config_home_env;            let git_prefix = &git_prefix;            let metas = [git_config::source::Kind::System, git_config::source::Kind::Global]                .iter()                .flat_map(|kind| kind.sources())                .filter_map(|source| {                    match source {                        git_config::Source::System if !use_system => return None,                        git_config::Source::Git if !use_git => return None,                        git_config::Source::User if !use_user => return None,                        _ => {}                    }                    let path = source                        .storage_location(&mut |name| {                            match name {                                git_ if git_.starts_with("GIT_") => Some(git_prefix),                                "XDG_CONFIG_HOME" => Some(xdg_config_home_env),                                "HOME" => Some(home_env),                                _ => None,                            }                            .and_then(|perm| std::env::var_os(name).and_then(|val| perm.check(val).ok().flatten()))                        })                        .map(|p| p.into_owned());                     git_config::file::Metadata {                        path,                        source: *source,                        level: 0,                        trust: git_sec::Trust::Full,                    }                    .into()                });             let err_on_nonexisting_paths = false;            let mut globals = git_config::File::from_paths_metadata_buf(                metas,                &mut buf,                err_on_nonexisting_paths,                git_config::file::init::Options {                    includes: git_config::file::includes::Options::no_follow(),                    ..options                },            )            .map_err(|err| match err {                git_config::file::init::from_paths::Error::Init(err) => Error::from(err),                git_config::file::init::from_paths::Error::Io(err) => err.into(),            })?            .unwrap_or_default();             globals.append(git_dir_config);            globals.resolve_includes(options)?;            if use_env {                globals.append(git_config::File::from_env(options)?.unwrap_or_default());            }            globals        };         let excludes_file = config            .path_filter("core", None, "excludesFile", &mut filter_config_section)            .map(|p| p.interpolate(options.includes.interpolate).map(|p| p.into_owned()))            .transpose()?;         let mut hex_len = None;        if let Some(hex_len_str) = config.string("core", None, "abbrev") {            if hex_len_str.trim().is_empty() {                return Err(Error::EmptyValue { key: "core.abbrev" });            }            if !hex_len_str.eq_ignore_ascii_case(b"auto") {                let value_bytes = hex_len_str.as_ref();                if let Ok(false) = Boolean::try_from(value_bytes).map(Into::into) {                    hex_len = object_hash.len_in_hex().into();                } else {                    let value = Integer::try_from(value_bytes)                        .map_err(|_| Error::CoreAbbrev {                            value: hex_len_str.clone().into_owned(),                            max: object_hash.len_in_hex() as u8,                        })?                        .to_decimal()                        .ok_or_else(|| Error::CoreAbbrev {                            value: hex_len_str.clone().into_owned(),                            max: object_hash.len_in_hex() as u8,                        })?;                    if value < 4 || value as usize > object_hash.len_in_hex() {                        return Err(Error::CoreAbbrev {                            value: hex_len_str.clone().into_owned(),                            max: object_hash.len_in_hex() as u8,                        });                    }                    hex_len = Some(value as usize);                }            }        }         let reflog = query_refupdates(&config);        let ignore_case = config_bool(&config, "core.ignoreCase", false)?;        let use_multi_pack_index = config_bool(&config, "core.multiPackIndex", true)?;        Ok(Cache {            resolved: config.into(),            use_multi_pack_index,            object_hash,            reflog,            is_bare,            ignore_case,            hex_len,            excludes_file,            xdg_config_home_env,            home_env,            personas: Default::default(),            git_prefix,        })    }     /// Return a path by using the `$XDF_CONFIG_HOME` or `$HOME/.config/…` environment variables locations.    #[cfg_attr(not(feature = "git-index"), allow(dead_code))]    pub fn xdg_config_path(        &self,        resource_file_name: &str,    ) -> Result<Option<PathBuf>, git_sec::permission::Error<PathBuf, git_sec::Permission>> {        std::env::var_os("XDG_CONFIG_HOME")            .map(|path| (path, &self.xdg_config_home_env))            .or_else(|| std::env::var_os("HOME").map(|path| (path, &self.home_env)))            .and_then(|(base, permission)| {                let resource = std::path::PathBuf::from(base).join("git").join(resource_file_name);                permission.check(resource).transpose()            })            .transpose()    }     /// Return the home directory if we are allowed to read it and if it is set in the environment.    ///    /// We never fail for here even if the permission is set to deny as we `git-config` will fail later    /// if it actually wants to use the home directory - we don't want to fail prematurely.    pub fn home_dir(&self) -> Option<PathBuf> {        std::env::var_os("HOME")            .map(PathBuf::from)            .and_then(|path| self.home_env.check(path).ok().flatten())    }} /// Accessimpl Cache {    pub fn personas(&self) -> &identity::Personas {        self.personas            .get_or_init(|| identity::Personas::from_config_and_env(&self.resolved, &self.git_prefix))    }} pub(crate) fn interpolate_context<'a>(    git_install_dir: Option<&'a std::path::Path>,    home_dir: Option<&'a std::path::Path>,) -> git_config::path::interpolate::Context<'a> {    git_config::path::interpolate::Context {        git_install_dir,        home_dir,        home_for_user: Some(git_config::path::interpolate::home_for_user), // TODO: figure out how to configure this    }} fn base_options(lossy: Option<bool>) -> git_config::file::init::Options<'static> {    git_config::file::init::Options {        lossy: lossy.unwrap_or(!cfg!(debug_assertions)),        ..Default::default()    }} fn config_bool(config: &git_config::File<'_>, key: &str, default: bool) -> Result<bool, Error> {    let (section, key) = key.split_once('.').expect("valid section.key format");    config        .boolean(section, None, key)        .unwrap_or(Ok(default))        .map_err(|err| Error::DecodeBoolean {            value: err.input,            key: key.into(),        })} fn query_refupdates(config: &git_config::File<'static>) -> Option<git_ref::store::WriteReflog> {    config.string("core", None, "logallrefupdates").map(|val| {        (val.eq_ignore_ascii_case(b"always"))            .then(|| git_ref::store::WriteReflog::Always)            .or_else(|| {                git_config::Boolean::try_from(val)                    .ok()                    .and_then(|b| b.is_true().then(|| git_ref::store::WriteReflog::Normal))            })            .unwrap_or(git_ref::store::WriteReflog::Disable)    })}