Re: Duplicate files /boot/grub/locale/*.mo~ in iso file made by grub-mkrescue

Hi, the result is negative.


renergy ~ # ./test_tmp_unlink_delay
Test file name : /tmp/test_tmp_unlink_delay_dir/x.mo~
Sub process    : File does not exist
Main process   : File does not exist
renergy ~ #



Best regards,
Adam


On 5/28/25 4:23 PM, Thomas Schmitt wrote:
> Hi,
> 
> the program in this mail creates a directory and a file in it.
> After checking that the file exists, it gets unlinked.
> Then the program forks and the child checks for the existence of the
> file, while the parent waits.
> The parent checks for file existence after the child has finished.
> Finally it deletes the directory.
> 
> I see:
> 
>    $ cc -g -Wall -o test_tmp_unlink_delay test_tmp_unlink_delay.c
>    $ ./test_tmp_unlink_delay
>    Test file name : /tmp/test_tmp_unlink_delay_dir/x.mo~
>    Sub process    : File does not exist
>    Main process   : File does not exist
>    $
> 
> If your /tmp is weird enough you might see
> 
>    Sub process    : FILE STILL EXISTS
> 
> Begin of C code:
> -----------------------------------------------------------------------
> 
> /*
>    cc -g -Wall -o test_tmp_unlink_delay test_tmp_unlink_delay.c
> */
> 
> #include <sys/stat.h>
> #include <sys/types.h>
> #include <stdio.h>
> #include <errno.h>
> #include <unistd.h>
> #include <sys/wait.h>
> 
> 
> int main(int argc, char **argv)
> {
>   FILE *fp;
>   pid_t pid;
>   int status;
>   struct stat stbuf;
>   char *dir_path= "/tmp/test_tmp_unlink_delay_dir";
>   char *file_path= "/tmp/test_tmp_unlink_delay_dir/x.mo~";
> 
>   fprintf(stderr, "Test file name : %s\n", file_path);
>   if(mkdir(dir_path, 0777) == -1) {
>     perror("Directory creation failed");
>     return(1);
>   }
>   fp= fopen(file_path, "w");
>   if(fp == NULL) {
>     perror("File creation failed");
>     return(2);
>   }
>   fprintf(fp, "content of %s\n", file_path);
>   fclose(fp);
>   if(stat(file_path, &stbuf) == -1) {
>     fprintf(stderr, "File does not exist before unlink\n");
>     return(3);
>   }
>   if(unlink(file_path) == -1) {
>     perror("File unlink failed");
>     return(4);
>   }
> 
>   pid= fork();
> 
>   if(pid == 0) {
>     fprintf(stderr, "Sub process    : ");
>   } else {
>     if(wait(&status) == -1) {
>       perror("Main process wait(2) failed");
>       return(5);
>     }
>     fprintf(stderr, "Main process   : ");
>   }
>   if(stat(file_path, &stbuf) == -1) {
>     fprintf(stderr, "File does not exist\n");
>   } else {
>     fprintf(stderr, "FILE STILL EXISTS\n");
>   }
>   if(pid != 0) {
>     if(rmdir(dir_path) == -1) {
>       perror("Directory removal failed");
>       return(6);
>     }
>   }
>   return(0);
> }
> 
> -----------------------------------------------------------------------
> End of C code.
> 
> 
> Have a nice day :)
> 
> Thomas
>