Merge branch 'jn/git-cmd-h-bypass-setup'

* jn/git-cmd-h-bypass-setup:
update-index -h: show usage even with corrupt index
merge -h: show usage even with corrupt index
ls-files -h: show usage even with corrupt index
gc -h: show usage even with broken configuration
commit/status -h: show usage even with broken configuration
checkout-index -h: show usage even in an invalid repository
branch -h: show usage even in an invalid repository

Conflicts:
builtin/merge.c

diff --cc builtin/branch.c
Simple merge

diff --cc builtin/checkout-index.c
Simple merge

diff --cc builtin/commit.c
Simple merge

diff --cc builtin/gc.c
Simple merge

diff --cc builtin/ls-files.c
Simple merge

diff --cc builtin/merge.c
index 3921cd304086cbc2edff0e1481f7c7395df8b00a,584c94f6fbc6bc474ac2b2bf35f0048ea58943e4..42fff387e69d9b5412e8e776aed3272b78ebe758
--- 1/builtin/merge.c
--- 2/builtin/merge.c
+++ b/builtin/merge.c
@@@ -922,6 -909,24 +922,9 @@@ int cmd_merge(int argc, const char **ar
        const char *best_strategy = NULL, *wt_strategy = NULL;
        struct commit_list **remotes = &remoteheads;
  
 -      if (read_cache_unmerged()) {
 -              die_resolve_conflict("merge");
 -      }
 -      if (file_exists(git_path("MERGE_HEAD"))) {
 -              /*
 -               * There is no unmerged entry, don't advise 'git
 -               * add/rm <file>', just 'git commit'.
 -               */
 -              if (advice_resolve_conflict)
 -                      die("You have not concluded your merge (MERGE_HEAD exists).\n"
 -                          "Please, commit your changes before you can merge.");
 -              else
 -                      die("You have not concluded your merge (MERGE_HEAD exists).");
 -      }
+       if (argc == 2 && !strcmp(argv[1], "-h"))
+               usage_with_options(builtin_merge_usage, builtin_merge_options);
 -      resolve_undo_clear();
+ 
        /*
         * Check if we are _not_ on a detached HEAD, i.e. if there is a
         * current branch.

diff --cc builtin/update-index.c
Simple merge

diff --cc t/t7508-status.sh
Simple merge