make inline is_null_sha1 global

[git.git] / exec_cmd.c

diff --git a/exec_cmd.c b/exec_cmd.c
index 12eb36494ca467169aff4db35335b3fdadd4cbee..62f51fcd6e367d2dc7e3dc8d967ee05fd1648d04 100644 (file)
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "exec_cmd.h"
+#include "quote.h"
 #define MAX_ARGS       32
 
 extern char **environ;
@@ -21,7 +22,7 @@ const char *git_exec_path(void)
                return current_exec_path;
 
        env = getenv("GIT_EXEC_PATH");
-       if (env) {
+       if (env && *env) {
                return env;
        }
 
@@ -43,7 +44,7 @@ int execv_git_cmd(const char **argv)
                const char *exec_dir = paths[i];
                const char *tmp;
 
-               if (!exec_dir) continue;
+               if (!exec_dir || !*exec_dir) continue;
 
                if (*exec_dir != '/') {
                        if (!getcwd(git_command, sizeof(git_command))) {
@@ -96,9 +97,27 @@ int execv_git_cmd(const char **argv)
                tmp = argv[0];
                argv[0] = git_command;
 
+               if (getenv("GIT_TRACE")) {
+                       const char **p = argv;
+                       fputs("trace: exec:", stderr);
+                       while (*p) {
+                               fputc(' ', stderr);
+                               sq_quote_print(stderr, *p);
+                               ++p;
+                       }
+                       putc('\n', stderr);
+                       fflush(stderr);
+               }
+
                /* execve() can only ever return if it fails */
                execve(git_command, (char **)argv, environ);
 
+               if (getenv("GIT_TRACE")) {
+                       fprintf(stderr, "trace: exec failed: %s\n",
+                               strerror(errno));
+                       fflush(stderr);
+               }
+
                argv[0] = tmp;
        }
        return -1;