git2cpp/src/utils/config_overrides.cpp at main · QuantStack/git2cpp · GitHub

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#include "config_overrides.hpp"

#ifdef EMSCRIPTEN

# include <iterator>

# include <git2/sys/config.h>

# include "git_exception.hpp"

#endif

void apply_config_overrides([[maybe_unused]] git_repository* repo)

{

#ifdef EMSCRIPTEN

// Config values to override, each in "name=value" form. core.filemode is disabled because

// the emscripten filesystem does support executable file permissions but some JupyterLite

// drive implementations do not.

const char* values[] = {"core.filemode=false"};

// Create an in-memory config backend holding these values. This backend is read-only, so

// any config writes (e.g. `git config` or values set by clone/init) skip it and go to the

// highest-priority writable backend instead, which is the repository's own config file.

// The overrides are therefore never persisted to disk. backend_type is a label that

// identifies where these entries came from when inspecting a config entry's origin.

git_config_backend* backend = nullptr;

git_config_backend_memory_options opts = GIT_CONFIG_BACKEND_MEMORY_OPTIONS_INIT;

opts.backend_type = "git2cpp-overrides";

throw_if_error(git_config_backend_from_values(&backend, values, std::size(values), &opts));

// git_repository_config returns the repository's cached, shared config object rather than a

// copy, so adding a backend to it affects all later config lookups through this repository.

// GIT_CONFIG_LEVEL_APP is the highest priority level, above the local, global and system

// config files, so these values win over any existing setting. The repo is passed so that

// conditional includes can be evaluated, and force=0 means fail rather than replace if a

// backend already exists at this level.

git_config* cfg = nullptr;

int error = git_repository_config(&cfg, repo);

if (error == 0)

{

error = git_config_add_backend(cfg, backend, GIT_CONFIG_LEVEL_APP, repo, 0);

// Only releases our reference; the repository still holds the config and its backends.

git_config_free(cfg);

}

if (error < 0)

{

// On success ownership of the backend passes to the config, but on failure it is still

// ours to free.

backend->free(backend);

throw_if_error(error);

}

#endif

}

git2cpp/src/utils/config_overrides.cpp at main · QuantStack/git2cpp · GitHub

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