diff options
| -rw-r--r-- | pkg/rootless/rootless_linux.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c index a29ea0ce1..9604de638 100644 --- a/pkg/rootless/rootless_linux.c +++ b/pkg/rootless/rootless_linux.c @@ -27,9 +27,13 @@ int renameat2 (int olddirfd, const char *oldpath, int newdirfd, const char *newp # ifdef SYS_renameat2 return (int) syscall (SYS_renameat2, olddirfd, oldpath, newdirfd, newpath, flags); # else - /* no way to implement it atomically. */ - errno = ENOSYS; - return -1; + /* This might be an issue if another process is trying to read the file while it is empty. */ + int fd = open (newpath, O_EXCL|O_CREAT, 0700); + if (fd < 0) + return fd; + close (fd); + /* We are sure we created the file, let's overwrite it. */ + return rename (oldpath, newpath); # endif } #endif |