trace2: fixup access problem on /etc/gitconfig in read_very_early_config

Teach do_git_config_sequence() to optionally gently check for access to
the system config.  Use this option in read_very_early_config() when
initializing trace2.

In [1] SZEDER Gábor reported that my changes in [2] introduced a
regression when the user does not have permission to read the system
config.

This commit addresses that problem by optionally ignoring that error.

[1] https://public-inbox.org/git/285beb2b2d740ce20fdd8af1becf371ab39703db.1554995916.git.gitgitgadget@gmail.com/T/#m342e839289aec515523a98b5e34d7f42d3f1fd79
[2] https://public-inbox.org/git/285beb2b2d740ce20fdd8af1becf371ab39703db.1554995916.git.gitgitgadget@gmail.com/T/#m11b59c9228c698442f750ee8f9b10c629399ae48

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/config.c b/config.c
index d7a08713a82fe2710d2096a01cee0ff39a2de8c0..3f5ad9dc3c90fe16a6328cd97ea6ebe326e19c61 100644 (file)
--- a/config.c
+++ b/config.c
@@ -1676,7 +1676,9 @@ static int do_git_config_sequence(const struct config_options *opts,
                repo_config = NULL;
 
        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
-       if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
+       if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK,
+                                                 opts->system_gently ?
+                                                 ACCESS_EACCES_OK : 0))
                ret += git_config_from_file(fn, git_etc_gitconfig(),
                                            data);
 
@@ -1807,6 +1809,7 @@ void read_very_early_config(config_fn_t cb, void *data)
        opts.ignore_repo = 1;
        opts.ignore_worktree = 1;
        opts.ignore_cmdline = 1;
+       opts.system_gently = 1;
 
        config_with_options(cb, data, NULL, &opts);
 }

diff --git a/config.h b/config.h
index 6a58d61d2250d316771ba536e80ba16ee3e299ce..36bb23a9d9380ed3d52f331f74f30cf3e54efafc 100644 (file)
--- a/config.h
+++ b/config.h
@@ -58,6 +58,7 @@ struct config_options {
        unsigned int ignore_repo : 1;
        unsigned int ignore_worktree : 1;
        unsigned int ignore_cmdline : 1;
+       unsigned int system_gently : 1;
        const char *commondir;
        const char *git_dir;
        config_parser_event_fn_t event_fn;