Infrastructure and commands to manage the environment for processes started

within tmux.

There is a global environment, copied from the external environment when the
server is started and each sesssion has an (initially empty) session
environment which overrides it.

New commands set-environment and show-environment manipulate or display the
environments.

A new session option, update-environment, is a space-separated list of
variables which are updated from the external environment into the session
environment every time a new session is created - the default is DISPLAY.

1 files changed, 88 insertions, 0 deletions

diff --git a/cmd-set-environment.c b/cmd-set-environment.c
new file mode 100644
index 00000000..85399a94
--- /dev/null
+++ b/cmd-set-environment.c
@@ -0,0 +1,88 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "tmux.h"
+
+/*
+ * Set an environment variable.
+ */
+
+int	cmd_set_environment_exec(struct cmd *, struct cmd_ctx *);
+
+const struct cmd_entry cmd_set_environment_entry = {
+	"set-environment", "setenv",
+	"[-gru] " CMD_OPTION_SESSION_USAGE,
+	0, CMD_CHFLAG('g')|CMD_CHFLAG('r')|CMD_CHFLAG('u'),
+	NULL,
+	cmd_option_parse,
+	cmd_set_environment_exec,
+	cmd_option_free,
+	cmd_option_print
+};
+
+int
+cmd_set_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct cmd_option_data	*data = self->data;
+	struct session		*s;
+	struct environ		*env;
+
+	if (*data->option == '\0') {
+		ctx->error(ctx, "empty variable name");
+		return (-1);
+	}
+	if (strchr(data->option, '=') != NULL) {
+		ctx->error(ctx, "variable name contains =");
+		return (-1);
+	}
+
+	if (data->chflags & CMD_CHFLAG('g'))
+		env = &global_environ;
+	else {
+		if ((s = cmd_find_session(ctx, data->target)) == NULL)
+			return (-1);
+		env = &s->environ;
+	}
+
+	if (data->chflags & CMD_CHFLAG('u')) {
+		if (data->value != NULL) {
+			ctx->error(ctx, "can't specify a value with -u");
+			return (-1);
+		}
+		environ_unset(env, data->option);
+	} else if (data->chflags & CMD_CHFLAG('r')) {
+		if (data->value != NULL) {
+			ctx->error(ctx, "can't specify a value with -r");
+			return (-1);
+		}
+		environ_set(env, data->option, NULL);
+	} else {
+		if (data->value == NULL) {
+			ctx->error(ctx, "no value specified");
+			return (-1);
+		}
+		environ_set(env, data->option, data->value);
+	}
+
+	return (0);
+}