From 3d18b167558bde95a076b16d40f9454f169e70ba Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 8 Oct 2015 14:33:53 +0200
Subject: [PATCH] util: do not reset terminal in acquire_terminal()

Before, we'd always reset acquired terminals, which is not really
desired, as we expose a setting TTYReset= which is supposed to control
whether the TTY is reset or not. Previously that setting would only
enable a second resetting of the TTY, which is of course pointless...

Hence, move the implicit resetting out of acquire_terminal() and make
the callers do it if they need it.
---
 src/basic/terminal-util.c                     |  8 +--
 src/core/execute.c                            | 54 ++++++++-----------
 .../tty-ask-password-agent.c                  |  4 ++
 3 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index e9097d8ae5..1bda9564fb 100644
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -480,10 +480,6 @@ int acquire_terminal(
 
         safe_close(notify);
 
-        r = reset_terminal_fd(fd, true);
-        if (r < 0)
-                log_warning_errno(r, "Failed to reset terminal: %m");
-
         return fd;
 
 fail:
@@ -616,6 +612,10 @@ int make_console_stdio(void) {
         if (fd < 0)
                 return log_error_errno(fd, "Failed to acquire terminal: %m");
 
+        r = reset_terminal_fd(fd, true);
+        if (r < 0)
+                log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
+
         r = make_stdio(fd);
         if (r < 0)
                 return log_error_errno(r, "Failed to duplicate terminal fd: %m");
diff --git a/src/core/execute.c b/src/core/execute.c
index 80ad87d4e4..d6217840c0 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -543,9 +543,9 @@ static int chown_terminal(int fd, uid_t uid) {
         return 0;
 }
 
-static int setup_confirm_stdio(int *_saved_stdin,
-                               int *_saved_stdout) {
-        int fd = -1, saved_stdin, saved_stdout = -1, r;
+static int setup_confirm_stdio(int *_saved_stdin, int *_saved_stdout) {
+        _cleanup_close_ int fd = -1, saved_stdin = -1, saved_stdout = -1;
+        int r;
 
         assert(_saved_stdin);
         assert(_saved_stdout);
@@ -555,10 +555,8 @@ static int setup_confirm_stdio(int *_saved_stdin,
                 return -errno;
 
         saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
-        if (saved_stdout < 0) {
-                r = errno;
-                goto fail;
-        }
+        if (saved_stdout < 0)
+                return -errno;
 
         fd = acquire_terminal(
                         "/dev/console",
@@ -566,39 +564,33 @@ static int setup_confirm_stdio(int *_saved_stdin,
                         false,
                         false,
                         DEFAULT_CONFIRM_USEC);
-        if (fd < 0) {
-                r = fd;
-                goto fail;
-        }
+        if (fd < 0)
+                return fd;
 
         r = chown_terminal(fd, getuid());
         if (r < 0)
-                goto fail;
+                return r;
 
-        if (dup2(fd, STDIN_FILENO) < 0) {
-                r = -errno;
-                goto fail;
-        }
+        r = reset_terminal_fd(fd, true);
+        if (r < 0)
+                return r;
 
-        if (dup2(fd, STDOUT_FILENO) < 0) {
-                r = -errno;
-                goto fail;
-        }
+        if (dup2(fd, STDIN_FILENO) < 0)
+                return -errno;
+
+        if (dup2(fd, STDOUT_FILENO) < 0)
+                return -errno;
 
         if (fd >= 2)
                 safe_close(fd);
+        fd = -1;
 
         *_saved_stdin = saved_stdin;
         *_saved_stdout = saved_stdout;
 
+        saved_stdin = saved_stdout = -1;
+
         return 0;
-
-fail:
-        safe_close(saved_stdout);
-        safe_close(saved_stdin);
-        safe_close(fd);
-
-        return r;
 }
 
 _printf_(1, 2) static int write_confirm_message(const char *format, ...) {
@@ -618,9 +610,7 @@ _printf_(1, 2) static int write_confirm_message(const char *format, ...) {
         return 0;
 }
 
-static int restore_confirm_stdio(int *saved_stdin,
-                                 int *saved_stdout) {
-
+static int restore_confirm_stdio(int *saved_stdin, int *saved_stdout) {
         int r = 0;
 
         assert(saved_stdin);
@@ -636,8 +626,8 @@ static int restore_confirm_stdio(int *saved_stdin,
                 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
                         r = -errno;
 
-        safe_close(*saved_stdin);
-        safe_close(*saved_stdout);
+        *saved_stdin = safe_close(*saved_stdin);
+        *saved_stdout = safe_close(*saved_stdout);
 
         return r;
 }
diff --git a/src/tty-ask-password-agent/tty-ask-password-agent.c b/src/tty-ask-password-agent/tty-ask-password-agent.c
index 5dbc0a9bcc..93cce186f0 100644
--- a/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ b/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -315,6 +315,10 @@ static int parse_password(const char *filename, char **wall) {
                                 tty_fd = acquire_terminal("/dev/console", false, false, false, USEC_INFINITY);
                                 if (tty_fd < 0)
                                         return log_error_errno(tty_fd, "Failed to acquire /dev/console: %m");
+
+                                r = reset_terminal_fd(tty_fd, true);
+                                if (r < 0)
+                                        log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
                         }
 
                         r = ask_password_tty(message, NULL, not_after, echo ? ASK_PASSWORD_ECHO : 0, filename, &password);