I have 2 files: /MyDir/a and /MyDir/MySubDir/b and am running a bash script, to which I want to add code to make file /a point to file /b, but only in the current process and its descendants.
In hopes of making /MyDir/a point to /MyDir/MySubDir/b in the context of only the current process (not including its descendants, yet) I tried to first make the current process run in its own mount namespace by running a small C program in my script that performs
mount --bind /MyDir/MySubDir/b /MyDir/a.
Unfortunately, this didn't work as I expected since the mount was still visible by other processes, despite the system call reporting success.
In another attempt, I tried to make the mount from the C code by calling
mount("/MyDir/a", "/MyDir/MySubDir/b", "ext3", MS_BIND, null)
But this didn't work as the mount didn't take effect at all (despite the call reporting success).
Is there a way of making /MyDir/a point to /MyDir/MySubDir/b in the context of only the current process and its descendants using a bash script?
I also read a little about chroot, but this applies only to the / directory... Is there anything similar to chroot that applies only to a particular subdirectory?
Thanks for your time!