add option to change working directory

Author: ideal

src/conf_gram.y

@@ -50,7 +50,7 @@ typedef void* yyscan_t;
 %parse-param { conf_t *conf }
 %parse-param {  yyscan_t scanner }
 
-%token OPENBRACE ENDBRACE TOKENTASK TOKENNAME TOKENPATH TOKENARGS TOKENENV SEMICOLON QUOTE
+%token OPENBRACE ENDBRACE TOKENTASK TOKENNAME TOKENPATH TOKENARGS TOKENENV TOKENDIR SEMICOLON QUOTE
 
 %union
 {
@@ -113,8 +113,8 @@ taskopt:
     args
     |
     env
-    {
-    }
+    |
+    dir
     ;
 
 name:
@@ -195,4 +195,11 @@ env:
     }
     ;
 
+dir:
+    TOKENDIR PATH SEMICOLON
+    {
+        check_task();
+        task->dir = $2;
+    };
+
 %%

src/conf_scan.l

@@ -20,6 +20,7 @@ name       return TOKENNAME;
 path       return TOKENPATH;
 args       return TOKENARGS;
 env        return TOKENENV;
+dir        return TOKENDIR;
 \"         return QUOTE;
 \;         return SEMICOLON;
 {number}+  yylval->string=strdup(yytext); return NUMBER;

src/task.c

@@ -48,6 +48,7 @@ int task_init(task_t *task, context_t *ctx)
     task->ctx  = ctx;
     task->path = NULL;
     task->name = NULL;
+    task->dir  = NULL;
     task->args = NULL;
     task->args_len   = 0;
     task->args_total = 0;
@@ -130,6 +131,12 @@ int task_run(task_t *task)
     switch(pid) {
     case 0:
         task_redirect_io(task);
+        if (task->dir && chdir(task->dir) < 0) {
+            bz_log_error(task->ctx->log,
+                         "change working directory failed, task: %s, error: %s",
+                         task->name, strerror(errno));
+            _exit(ERROR);
+        }
         ret = execv(task->path, task->args);
         if (ret < 0) {
             bz_log_error(task->ctx->log,

src/task.h

@@ -38,6 +38,7 @@ typedef struct task_s {
     char *log_path;
     const char *path;
     const char *name;
+    const char *dir;
     char **args;
     size_t args_len;
     size_t args_total;