cmd-if-shell.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
   5  * Copyright (c) 2009 Nicholas Marriott <nicm@openbsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  16  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  17  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/wait.h>
  22
  23 #include <string.h>
  24
  25 #include "tmux.h"
  26
  27 /*
  28  * Executes a tmux command if a shell command returns true or false.
  29  */
  30
  31 int     cmd_if_shell_exec(struct cmd *, struct cmd_ctx *);
  32
  33 void    cmd_if_shell_callback(struct job *);
  34 void    cmd_if_shell_free(void *);
  35
  36 const struct cmd_entry cmd_if_shell_entry = {
  37         "if-shell", "if",
  38         "", 2, 3,
  39         "shell-command command [command]",
  40         0,
  41         NULL,
  42         NULL,
  43         cmd_if_shell_exec
  44 };
  45
  46 struct cmd_if_shell_data {
  47         char            *cmd_if;
  48         char            *cmd_else;
  49         struct cmd_ctx   ctx;
  50 };
  51
  52 int
  53 cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
  54 {
  55         struct args                     *args = self->args;
  56         struct cmd_if_shell_data        *cdata;
  57         const char                      *shellcmd = args->argv[0];
  58
  59         cdata = xmalloc(sizeof *cdata);
  60         cdata->cmd_if = xstrdup(args->argv[1]);
  61         if (args->argc == 3)
  62                 cdata->cmd_else = xstrdup(args->argv[2]);
  63         else
  64                 cdata->cmd_else = NULL;
  65         memcpy(&cdata->ctx, ctx, sizeof cdata->ctx);
  66
  67         if (ctx->cmdclient != NULL)
  68                 ctx->cmdclient->references++;
  69         if (ctx->curclient != NULL)
  70                 ctx->curclient->references++;
  71
  72         job_run(shellcmd, cmd_if_shell_callback, cmd_if_shell_free, cdata);
  73
  74         return (1);     /* don't let client exit */
  75 }
  76
  77 void
  78 cmd_if_shell_callback(struct job *job)
  79 {
  80         struct cmd_if_shell_data        *cdata = job->data;
  81         struct cmd_ctx                  *ctx = &cdata->ctx;
  82         struct cmd_list                 *cmdlist;
  83         char                            *cause, *cmd;
  84
  85         if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0) {
  86                 cmd = cdata->cmd_else;
  87                 if (cmd == NULL)
  88                         return;
  89         } else
  90                 cmd = cdata->cmd_if;
  91         if (cmd_string_parse(cmd, &cmdlist, &cause) != 0) {
  92                 if (cause != NULL) {
  93                         ctx->error(ctx, "%s", cause);
  94                         xfree(cause);
  95                 }
  96                 return;
  97         }
  98
  99         cmd_list_exec(cmdlist, ctx);
 100         cmd_list_free(cmdlist);
 101 }
 102
 103 void
 104 cmd_if_shell_free(void *data)
 105 {
 106         struct cmd_if_shell_data        *cdata = data;
 107         struct cmd_ctx                  *ctx = &cdata->ctx;
 108         struct msg_exit_data             exitdata;
 109
 110         if (ctx->cmdclient != NULL) {
 111                 ctx->cmdclient->references--;
 112                 exitdata.retcode = ctx->cmdclient->retcode;
 113                 ctx->cmdclient->flags |= CLIENT_EXIT;
 114         }
 115         if (ctx->curclient != NULL)
 116                 ctx->curclient->references--;
 117
 118         if (cdata->cmd_else != NULL)
 119                 xfree(cdata->cmd_else);
 120         xfree(cdata->cmd_if);
 121         xfree(cdata);
 122 }