Merge branch 'jc/ident'

* jc/ident:
  Keep Porcelainish from failing by broken ident after making changes.
  Delay "empty ident" errors until they really matter.
  Make "empty ident" error message a bit more helpful.

8 files changed, 45 insertions, 16 deletions

diff --git a/cache.h b/cache.h
index b5db01f28d..da73fb37c3 100644
--- a/cache.h
+++ b/cache.h
@@ -246,8 +246,8 @@ void datestamp(char *buf, int bufsize);
 unsigned long approxidate(const char *);
 
 extern int setup_ident(void);
-extern const char *git_author_info(void);
-extern const char *git_committer_info(void);
+extern const char *git_author_info(int);
+extern const char *git_committer_info(int);
 
 struct checkout {
 	const char *base_dir;
diff --git a/commit-tree.c b/commit-tree.c
index b1c8dca48d..88871b022d 100644
--- a/commit-tree.c
+++ b/commit-tree.c
@@ -118,8 +118,8 @@ int main(int argc, char **argv)
 		add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 
 	/* Person/date information */
-	add_buffer(&buffer, &size, "author %s\n", git_author_info());
-	add_buffer(&buffer, &size, "committer %s\n\n", git_committer_info());
+	add_buffer(&buffer, &size, "author %s\n", git_author_info(1));
+	add_buffer(&buffer, &size, "committer %s\n\n", git_committer_info(1));
 
 	/* And add the comment */
 	while (fgets(comment, sizeof(comment), stdin) != NULL)
diff --git a/git-am.sh b/git-am.sh
index 98b9215f70..85ecada657 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -1,11 +1,13 @@
 #!/bin/sh
 #
-#
+# Copyright (c) 2005, 2006 Junio C Hamano
 
 USAGE='[--signoff] [--dotest=<dir>] [--utf8] [--binary] [--3way] <mbox>
   or, when resuming [--skip | --resolved]'
 . git-sh-setup
 
+git var GIT_COMMITTER_IDENT >/dev/null || exit
+
 stop_here () {
     echo "$1" >"$dotest/next"
     exit 1
diff --git a/git-applymbox.sh b/git-applymbox.sh
index 61c8c024c6..5569fdcc34 100755
--- a/git-applymbox.sh
+++ b/git-applymbox.sh
@@ -21,6 +21,8 @@
 USAGE='[-u] [-k] [-q] [-m] (-c .dotest/<num> | mbox) [signoff]'
 . git-sh-setup
 
+git var GIT_COMMITTER_IDENT >/dev/null || exit
+
 keep_subject= query_apply= continue= utf8= resume=t
 while case "$#" in 0) break ;; esac
 do
diff --git a/git-merge.sh b/git-merge.sh
index 74f07610fa..2b4a603dff 100755
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -142,6 +142,8 @@ case "$#,$common,$no_commit" in
 1,*,)
 	# We are not doing octopus, not fast forward, and have only
 	# one common.  See if it is really trivial.
+	git var GIT_COMMITTER_IDENT >/dev/null || exit
+
 	echo "Trying really trivial in-index merge..."
 	git-update-index --refresh 2>/dev/null
 	if git-read-tree --trivial -m -u $common $head "$1" &&
@@ -179,6 +181,9 @@ case "$#,$common,$no_commit" in
 	;;
 esac
 
+# We are going to make a new commit.
+git var GIT_COMMITTER_IDENT >/dev/null || exit
+
 case "$use_strategies" in
 '')
 	case "$#" in
diff --git a/git-resolve.sh b/git-resolve.sh
index 9263070054..b53ede8d87 100755
--- a/git-resolve.sh
+++ b/git-resolve.sh
@@ -50,6 +50,9 @@ case "$common" in
 	;;
 esac
 
+# We are going to make a new commit.
+git var GIT_COMMITTER_IDENT >/dev/null || exit
+
 # Find an optimum merge base if there are more than one candidates.
 LF='
 '
diff --git a/ident.c b/ident.c
index 23b8cfc600..7c81fe8d8b 100644
--- a/ident.c
+++ b/ident.c
@@ -156,8 +156,18 @@ static int copy(char *buf, int size, int offset, const char *src)
 	return offset;
 }
 
+static const char au_env[] = "GIT_AUTHOR_NAME";
+static const char co_env[] = "GIT_COMMITTER_NAME";
+static const char *env_hint =
+"\n*** Environment problem:\n"
+"*** Your name cannot be determined from your system services (gecos).\n"
+"*** You would need to set %s and %s\n"
+"*** environment variables; otherwise you won't be able to perform\n"
+"*** certain operations because of \"empty ident\" errors.\n"
+"*** Alternatively, you can use user.name configuration variable.\n\n";
+
 static const char *get_ident(const char *name, const char *email,
-			     const char *date_str)
+			     const char *date_str, int error_on_no_name)
 {
 	static char buffer[1000];
 	char date[50];
@@ -168,9 +178,14 @@ static const char *get_ident(const char *name, const char *email,
 	if (!email)
 		email = git_default_email;
 
-	if (!*name || !*email)
-		die("empty ident %s <%s> not allowed",
-		    name, email);
+	if (!*name) {
+		if (name == git_default_name && env_hint) {
+			fprintf(stderr, env_hint, au_env, co_env);
+			env_hint = NULL; /* warn only once, for "git-var -l" */
+		}
+		if (error_on_no_name)
+			die("empty ident %s <%s> not allowed", name, email);
+	}
 
 	strcpy(date, git_default_date);
 	if (date_str)
@@ -187,16 +202,18 @@ static const char *get_ident(const char *name, const char *email,
 	return buffer;
 }
 
-const char *git_author_info(void)
+const char *git_author_info(int error_on_no_name)
 {
 	return get_ident(getenv("GIT_AUTHOR_NAME"),
 			 getenv("GIT_AUTHOR_EMAIL"),
-			 getenv("GIT_AUTHOR_DATE"));
+			 getenv("GIT_AUTHOR_DATE"),
+			 error_on_no_name);
 }
 
-const char *git_committer_info(void)
+const char *git_committer_info(int error_on_no_name)
 {
 	return get_ident(getenv("GIT_COMMITTER_NAME"),
 			 getenv("GIT_COMMITTER_EMAIL"),
-			 getenv("GIT_COMMITTER_DATE"));
+			 getenv("GIT_COMMITTER_DATE"),
+			 error_on_no_name);
 }
diff --git a/var.c b/var.c
index 59da56da0f..a57a33b81a 100644
--- a/var.c
+++ b/var.c
@@ -12,7 +12,7 @@ static const char var_usage[] = "git-var [-l | <variable>]";
 
 struct git_var {
 	const char *name;
-	const char *(*read)(void);
+	const char *(*read)(int);
 };
 static struct git_var git_vars[] = {
 	{ "GIT_COMMITTER_IDENT", git_committer_info },
@@ -24,7 +24,7 @@ static void list_vars(void)
 {
 	struct git_var *ptr;
 	for(ptr = git_vars; ptr->read; ptr++) {
-		printf("%s=%s\n", ptr->name, ptr->read());
+		printf("%s=%s\n", ptr->name, ptr->read(0));
 	}
 }
 
@@ -35,7 +35,7 @@ static const char *read_var(const char *var)
 	val = NULL;
 	for(ptr = git_vars; ptr->read; ptr++) {
 		if (strcmp(var, ptr->name) == 0) {
-			val = ptr->read();
+			val = ptr->read(1);
 			break;
 		}
 	}