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git wrapper: more careful argument stuffing 

- Use stderr for error output
 - Build git_command more careful
 - ENOENT is good enough for check of failed exec to show usage, no
   access() check needed

[jc: Originally from Alex Riesen with inputs from Sven
 Verdoolaege mixed in.]

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Alex Riesen 2005-12-01 13:48:35 +01:00 committed by Junio C Hamano
parent ce3ca27545
commit 10b15b86f5
1 changed files with 12 additions and 7 deletions
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19
git.c
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@ -283,16 +283,21 @@ int main(int argc, char **argv, char **envp)
len = strlen(git_command);
prepend_to_path(git_command, len);
strncat(&git_command[len], "/git-", sizeof(git_command) - len);
len += 5;
strncat(&git_command[len], argv[i], sizeof(git_command) - len);
if (access(git_command, X_OK))
usage(exec_path, "'%s' is not a git-command", argv[i]);
len += snprintf(git_command + len, sizeof(git_command) - len,
"/git-%s", argv[i]);
if (sizeof(git_command) <= len) {
fprintf(stderr, "git: command name given is too long (%d)\n", len);
exit(1);
}
/* execve() can only ever return if it fails */
execve(git_command, &argv[i], envp);
printf("Failed to run command '%s': %s\n", git_command, strerror(errno));
if (errno == ENOENT)
usage(exec_path, "'%s' is not a git-command", argv[i]);
fprintf(stderr, "Failed to run command '%s': %s\n",
git_command, strerror(errno));
return 1;
}