Merge branch 'jk/maint-commit-check-committer-early'

"git commit --amend" let the user edit the log message and then died
when the human-readable committer name was given insufficiently by
getpwent(3).

* jk/maint-commit-check-committer-early:
  commit: check committer identity more strictly

diff --cc builtin/commit.c
index 95eeab1d5146628277b0ba2c4e4bc7a6f77f3a4a,f9088d325f7ec225c870af438611375542b9e782..20cef95d600aeb15b716793beb5fb2534cc2b682
--- 1/builtin/commit.c
--- 2/builtin/commit.c
+++ b/builtin/commit.c
@@@ -724,8 -771,11 +724,8 @@@ static int prepare_to_commit(const cha
  
        strbuf_release(&sb);
  
 -      /* This checks and barfs if author is badly specified */
 -      determine_author_info(author_ident);
 -
        /* This checks if committer ident is explicitly given */
-       strbuf_addstr(&committer_ident, git_committer_info(0));
+       strbuf_addstr(&committer_ident, git_committer_info(IDENT_STRICT));
        if (use_editor && include_status) {
                char *ai_tmp, *ci_tmp;
                if (whence != FROM_COMMIT)