From 9d67a3a2d4fd378ca04726c5eb5f31ee222c50e4 Mon Sep 17 00:00:00 2001

From: Jan Synacek <jsynacek@redhat.com>

Date: Tue, 19 Jan 2016 10:17:19 +0100

Subject: [PATCH] basic/terminal-util: introduce SYSTEMD_COLORS environment

 variable

... to determine if color output should be enabled. If the variable is not set,

fall back to using on_tty(). Also, rewrite existing code to use

colors_enabled() where appropriate.

Cherry-picked from: 40c9fe4c0862114dab390c8ed16f78cf056b9140

Resolves: #1247963

---

 man/systemd.xml           |  7 +++++++

 src/journal/journalctl.c  |  2 +-

 src/login/loginctl.c      |  2 +-

 src/machine/machinectl.c  |  2 +-

 src/shared/util.c         | 13 +++++++++++++

 src/shared/util.h         | 13 +++++++------

 src/systemctl/systemctl.c |  2 +-

 7 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/man/systemd.xml b/man/systemd.xml

index eb289f03b..30005b1ef 100644

--- a/man/systemd.xml

+++ b/man/systemd.xml

@@ -754,6 +754,13 @@

         script runlevel link farms.</para></listitem>

       </varlistentry>

+      <varlistentry>

+        <term><varname>$SYSTEMD_COLORS</varname></term>

+

+        <listitem><para>Controls whether colorized output should be generated.

+        </para></listitem>

+      </varlistentry>

+

       <varlistentry>

         <term><varname>$LISTEN_PID</varname></term>

         <term><varname>$LISTEN_FDS</varname></term>

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c

index 8236d0810..7058788ef 100644

--- a/src/journal/journalctl.c

+++ b/src/journal/journalctl.c

@@ -2140,7 +2140,7 @@ int main(int argc, char *argv[]) {

                         flags =

                                 arg_all * OUTPUT_SHOW_ALL |

                                 arg_full * OUTPUT_FULL_WIDTH |

-                                on_tty() * OUTPUT_COLOR |

+                                colors_enabled() * OUTPUT_COLOR |

                                 arg_catalog * OUTPUT_CATALOG |

                                 arg_utc * OUTPUT_UTC;

diff --git a/src/login/loginctl.c b/src/login/loginctl.c

index 6c8a59e7c..8e3bfbea8 100644

--- a/src/login/loginctl.c

+++ b/src/login/loginctl.c

@@ -83,7 +83,7 @@ static OutputFlags get_output_flags(void) {

                 arg_all * OUTPUT_SHOW_ALL |

                 arg_full * OUTPUT_FULL_WIDTH |

                 (!on_tty() || pager_have()) * OUTPUT_FULL_WIDTH |

-                on_tty() * OUTPUT_COLOR;

+                colors_enabled() * OUTPUT_COLOR;

 }

 static int list_sessions(int argc, char *argv[], void *userdata) {

diff --git a/src/machine/machinectl.c b/src/machine/machinectl.c

index f1910709d..ef1214a66 100644

--- a/src/machine/machinectl.c

+++ b/src/machine/machinectl.c

@@ -105,7 +105,7 @@ static OutputFlags get_output_flags(void) {

                 arg_all * OUTPUT_SHOW_ALL |

                 arg_full * OUTPUT_FULL_WIDTH |

                 (!on_tty() || pager_have()) * OUTPUT_FULL_WIDTH |

-                on_tty() * OUTPUT_COLOR |

+                colors_enabled() * OUTPUT_COLOR |

                 !arg_quiet * OUTPUT_WARN_CUTOFF;

 }

diff --git a/src/shared/util.c b/src/shared/util.c

index 50925888d..dc5185269 100644

--- a/src/shared/util.c

+++ b/src/shared/util.c

@@ -8146,3 +8146,16 @@ char *shell_maybe_quote(const char *s) {

         return r;

 }

+

+bool colors_enabled(void) {

+        const char *colors;

+

+        colors = getenv("SYSTEMD_COLORS");

+        if (!colors) {

+                if (streq_ptr(getenv("TERM"), "dumb"))

+                        return false;

+                return on_tty();

+        }

+

+        return parse_boolean(colors) != 0;

+}

diff --git a/src/shared/util.h b/src/shared/util.h

index 7ecfd8571..b4a4a491f 100644

--- a/src/shared/util.h

+++ b/src/shared/util.h

@@ -485,29 +485,30 @@ unsigned lines(void);

 void columns_lines_cache_reset(int _unused_ signum);

 bool on_tty(void);

+bool colors_enabled(void);

 static inline const char *ansi_highlight(void) {

-        return on_tty() ? ANSI_HIGHLIGHT_ON : "";

+        return colors_enabled() ? ANSI_HIGHLIGHT_ON : "";

 }

 static inline const char *ansi_highlight_red(void) {

-        return on_tty() ? ANSI_HIGHLIGHT_RED_ON : "";

+        return colors_enabled() ? ANSI_HIGHLIGHT_RED_ON : "";

 }

 static inline const char *ansi_highlight_green(void) {

-        return on_tty() ? ANSI_HIGHLIGHT_GREEN_ON : "";

+        return colors_enabled() ? ANSI_HIGHLIGHT_GREEN_ON : "";

 }

 static inline const char *ansi_highlight_yellow(void) {

-        return on_tty() ? ANSI_HIGHLIGHT_YELLOW_ON : "";

+        return colors_enabled() ? ANSI_HIGHLIGHT_YELLOW_ON : "";

 }

 static inline const char *ansi_highlight_blue(void) {

-        return on_tty() ? ANSI_HIGHLIGHT_BLUE_ON : "";

+        return colors_enabled() ? ANSI_HIGHLIGHT_BLUE_ON : "";

 }

 static inline const char *ansi_highlight_off(void) {

-        return on_tty() ? ANSI_HIGHLIGHT_OFF : "";

+        return colors_enabled() ? ANSI_HIGHLIGHT_OFF : "";

 }

 int files_same(const char *filea, const char *fileb);

diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c

index 89d0b3b39..5d3a85fd9 100644

--- a/src/systemctl/systemctl.c

+++ b/src/systemctl/systemctl.c

@@ -197,7 +197,7 @@ static OutputFlags get_output_flags(void) {

                 arg_all * OUTPUT_SHOW_ALL |

                 arg_full * OUTPUT_FULL_WIDTH |

                 (!on_tty() || pager_have()) * OUTPUT_FULL_WIDTH |

-                on_tty() * OUTPUT_COLOR |

+                colors_enabled() * OUTPUT_COLOR |

                 !arg_quiet * OUTPUT_WARN_CUTOFF;

 }