Add an option to ovs-ofctl utility so as to obtain colorized output in
tty, for easier reading. Currently, only the dump-flows command supports
colors.
A new `--color` option has been added to ovs-ofctl so as to indicate
whether color markers should be used or not. It can be set to `always`
(force colors), `never` (no colors) or `auto` (use colors only if output
is a tty). If provided without any value, it is the same as `auto`. If
the option is not provided at all, colors are disabled by default.
Examples:
This first call will output colorized flows:
ovs-ofctl dump-flows br0 --color=always
These two calls will produce colorized output on a tty, but they will
not use color markers if the output is redirected to a file or piped
into another command:
ovs-ofctl dump-flows br0 --color=auto
ovs-ofctl dump-flows br0 --color
These two calls will not use color markers:
ovs-ofctl dump-flows br0 --color=never
ovs-ofctl dump-flows br0
The result of this option is stored into a variable which is to be
forwarded (in next commits) as a function argument until it reaches the
functions that print the elements of the flows.
Signed-off-by: Quentin Monnet <quentin.mon...@6wind.com>
---
lib/util.c | 11 +++++++++++
lib/util.h | 2 ++
utilities/ovs-ofctl.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 47 insertions(+)
diff --git a/lib/util.c b/lib/util.c
index f06dee5e7f6b..e3519f2bd3ac 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -2041,6 +2041,17 @@ xsleep(unsigned int seconds)
ovsrcu_quiesce_end();
}
+/* Determine whether standard output is a tty or not. This is useful to decide
+ * whether to use color output or not when --color option for utilities is set
+ * to `auto`.
+ */
+bool
+is_stdout_a_tty(void)
+{
+ char const *t = getenv("TERM");
+ return (isatty(STDOUT_FILENO) && t && strcmp(t, "dumb") != 0);
+}
+
#ifdef _WIN32
char *
diff --git a/lib/util.h b/lib/util.h
index afd8e378c337..389c093a2fd7 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -613,6 +613,8 @@ ovs_be128_is_zero(const ovs_be128 *val)
void xsleep(unsigned int seconds);
+bool is_stdout_a_tty(void);
+
#ifdef _WIN32
char *ovs_format_message(int error);
diff --git a/utilities/ovs-ofctl.c b/utilities/ovs-ofctl.c
index 7bcfc66a351f..c535005797af 100644
--- a/utilities/ovs-ofctl.c
+++ b/utilities/ovs-ofctl.c
@@ -75,6 +75,9 @@ VLOG_DEFINE_THIS_MODULE(ofctl);
*/
static bool bundle = false;
+/* --color: Use color markers. */
+static bool enable_color;
+
/* --strict: Use strict matching for flow mod commands? Additionally governs
* use of nx_pull_match() instead of nx_pull_match_loose() in parse-nx-match.
*/
@@ -170,6 +173,7 @@ parse_options(int argc, char *argv[])
OPT_RSORT,
OPT_UNIXCTL,
OPT_BUNDLE,
+ OPT_COLOR,
DAEMON_OPTION_ENUMS,
OFP_VERSION_OPTION_ENUMS,
VLOG_OPTION_ENUMS
@@ -188,6 +192,7 @@ parse_options(int argc, char *argv[])
{"help", no_argument, NULL, 'h'},
{"option", no_argument, NULL, 'o'},
{"bundle", no_argument, NULL, OPT_BUNDLE},
+ {"color", optional_argument, NULL, OPT_COLOR},
DAEMON_LONG_OPTIONS,
OFP_VERSION_LONG_OPTIONS,
VLOG_LONG_OPTIONS,
@@ -289,6 +294,34 @@ parse_options(int argc, char *argv[])
unixctl_path = optarg;
break;
+ case OPT_COLOR:
+ if (optarg) {
+ if (!strcasecmp (optarg, "always")
+ || !strcasecmp (optarg, "yes")
+ || !strcasecmp (optarg, "force")) {
+ enable_color = true;
+ }
+ else if (!strcasecmp (optarg, "never")
+ || !strcasecmp (optarg, "no")
+ || !strcasecmp (optarg, "none")) {
+ enable_color = false;
+ }
+ /* If --color is empty or set to 'auto', determine whether we
+ * need colors, i.e. whether standard output is a tty. */
+ else if (!strcasecmp (optarg, "auto")
+ || !strcasecmp (optarg, "tty")
+ || !strcasecmp (optarg, "if-tty")) {
+ enable_color = is_stdout_a_tty();
+ }
+ else {
+ ovs_fatal(0, "incorrect value `%s' for --color", optarg);
+ }
+ }
+ else {
+ enable_color = is_stdout_a_tty();
+ }
+ break;
+
DAEMON_OPTION_HANDLERS
OFP_VERSION_OPTION_HANDLERS
VLOG_OPTION_HANDLERS
@@ -417,6 +450,7 @@ usage(void)
" --sort[=field] sort in ascending order\n"
" --rsort[=field] sort in descending order\n"
" --unixctl=SOCKET set control socket name\n"
+ " --color[=always|never|auto] use colors markers\n"
" -h, --help display this help message\n"
" -V, --version display version information\n");
exit(EXIT_SUCCESS);
--
1.9.1
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