Make pkg bootstrap program ask for confirmation before proceeding.

The previous behaviour was to silently download and install the pkg
package, without ever telling user about what it was doing and why.

Discussed with:	bapt
Reviewed by: kib

1 files changed, 35 insertions, 1 deletions

diff --git a/usr.sbin/pkg/pkg.c b/usr.sbin/pkg/pkg.c
index b6c0207..1849eeb 100644
--- a/usr.sbin/pkg/pkg.c
+++ b/usr.sbin/pkg/pkg.c
@@ -389,6 +389,28 @@ cleanup:
 	return (ret);
 }
 
+static const char confirmation_message[] =
+"The package management tool is not yet installed on your system.\n"
+"Do you want to fetch and install it now? [y/N]: ";
+
+static int
+pkg_query_yes_no(void)
+{
+	int ret, c;
+
+	c = getchar();
+
+	if (c == 'y' || c == 'Y')
+		ret = 1;
+	else
+		ret = 0;
+
+	while (c != '\n' && c != EOF)
+		c = getchar();
+
+	return (ret);
+}
+
 int
 main(__unused int argc, char *argv[])
 {
@@ -397,9 +419,21 @@ main(__unused int argc, char *argv[])
 	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
 	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
 
-	if (access(pkgpath, X_OK) == -1)
+	if (access(pkgpath, X_OK) == -1) {
+		/*
+		 * Do not ask for confirmation if either of stdin or stdout is
+		 * not tty. Check the environment to see if user has answer
+		 * tucked in there already.
+		 */
+		if (getenv("ALWAYS_ASSUME_YES") == NULL &&
+		    isatty(fileno(stdin))) {
+			printf("%s", confirmation_message);
+			if (pkg_query_yes_no() == 0)
+				exit(EXIT_FAILURE);
+		}
 		if (bootstrap_pkg() != 0)
 			exit(EXIT_FAILURE);
+	}
 
 	execv(pkgpath, argv);