Re: [PATCH v2 4/5] upload-pack: read uploadpack.lazyFetchTrusted

> Previous commits created and prepared the path_allowlist_apply()
> function.
>
> Let's reuse this function for a new "uploadpack.lazyFetchTrusted"
> configuration variable.
>
> It allows us to:
>
>   - read an allowlist from that config variable,
>   - check if the current repo is in that list, and
>   - return the result from a new upload_pack_lazy_fetch_trusted()
>     function.
>
> The new function will be used in a following commit.
>
> Note that the new config variable should be read only from protected
> configuration files.
>
> Signed-off-by: Christian Couder <christian.couder@gmail.com>
> ---

>  upload-pack.c | 37 +++++++++++++++++++++++++++++++++++++
>  upload-pack.h |  3 +++
>  2 files changed, 40 insertions(+)
>
> diff --git a/upload-pack.c b/upload-pack.c
> index a52856d869..29e700e43b 100644
> --- a/upload-pack.c
> +++ b/upload-pack.c
> @@ -34,6 +34,8 @@
>  #include "json-writer.h"
>  #include "strmap.h"
>  #include "promisor-remote.h"
> +#include "setup.h"
> +#include "abspath.h"
>  
>  /* Remember to update object flag allocation in object.h */
>  #define THEY_HAVE	(1u << 11)
> @@ -1378,6 +1380,41 @@ static int upload_pack_config(const char *var, const char *value,
>  	return parse_hide_refs_config(var, value, "uploadpack", &data->hidden_refs);
>  }
>  
> +struct lazy_fetch_trusted {
> +	int trusted;
> +	char *repo_path;
> +};
> +
> +static int upload_pack_protected_lazy_fetch_config(const char *var, const char *value,
> +						   const struct config_context *ctx UNUSED,
> +						   void *cb_data)
> +{
> +	struct lazy_fetch_trusted *data = cb_data;
> +
> +	if (!strcmp("uploadpack.lazyfetchtrusted", var)) {
> +		path_allowlist_apply(var, value, data->repo_path,
> +				     &data->trusted, false);
> +		return 0;
> +	}
> +
> +	return 0;
> +}
> +
> +bool upload_pack_lazy_fetch_trusted(struct repository *r)
> +{
> +	struct lazy_fetch_trusted data = { 0 };
> +
> +	data.repo_path = real_pathdup(r->worktree ? r->worktree : r->gitdir, 0);
> +	if (!data.repo_path)
> +		return false;
> +
> +	git_protected_config(upload_pack_protected_lazy_fetch_config, &data);
> +
> +	free(data.repo_path);
> +
> +	return !!data.trusted;
> +}
> +
>  static int upload_pack_protected_config(const char *var, const char *value,
>  					const struct config_context *ctx UNUSED,
>  					void *cb_data)
> diff --git a/upload-pack.h b/upload-pack.h
> index d6ee25ea98..b2212992c3 100644
> --- a/upload-pack.h
> +++ b/upload-pack.h
> @@ -12,4 +12,7 @@ struct strbuf;
>  int upload_pack_advertise(struct repository *r,
>  			  struct strbuf *value);
>  
> +/* Is this repo trusted for lazy fetching? */
> +bool upload_pack_lazy_fetch_trusted(struct repository *r);
> +
>  #endif /* UPLOAD_PACK_H */