builtin-am: check for valid committer ident

When commit_tree() is called, if the user does not have an explicit
committer ident configured, it will attempt to construct a default
committer ident based on the user's and system's info (e.g. gecos field,
hostname etc.) However, if a default committer ident is unable to be
constructed, commit_tree() will die(), but at this point of git-am's
execution, there will already be changes made to the index and work
tree.

This can be confusing to new users, and as such since d64e6b0 (Keep
Porcelainish from failing by broken ident after making changes.,
2006-02-18) git-am.sh will check to see if the committer ident has been
configured, or a default one can be constructed, before even starting to
apply patches.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/am.c b/builtin/am.c
index 3c503920138c567bb756f093d9c684eae8f66834..1ff74ac1367efd023179155047bf4b59802aeb08 100644 (file)
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2246,6 +2246,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
                fprintf_ln(stderr, _("The -b/--binary option has been a no-op for long time, and\n"
                                "it will be removed. Please do not use it anymore."));
 
+       /* Ensure a valid committer ident can be constructed */
+       git_committer_info(IDENT_STRICT);
+
        if (read_index_preload(&the_index, NULL) < 0)
                die(_("failed to read the index"));