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Mic92 / envfs

Fuse filesystem that returns symlinks to executables based on the PATH of the requesting process.

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Demo in the README is outdated

wentasah opened this issue · comments

commented

This command from the README:

$ ls -l /usr/bin/{bash,python}
lr----x--t 0 root  1 Jan  1970  /usr/bin/bash -> /nix/store/j37555sj2w3xsql3f8qrwbaim7pv67hg-bash-interactive-4.4-p23/bin/bash
lr----x--t 0 root  1 Jan  1970  /usr/bin/python -> /home/joerg/.nix-profile/bin/python

now results in:

ls: cannot access '/usr/bin/bash': No such file or directory
ls: cannot access '/usr/bin/python': No such file or directory

because envfs only responds lookups from execve syscalls.

On a related note - what is the reason to only respond to execve lookups? I guess it's to minimize the filesystem polution. I now work with a project that not only has shebangs pointing to /usr/bin, but also checks for interpreter presence in /usr/bin before running the scripts. Having envfs responding to all lookups as before would help me a lot in this case. What about responding all lookups if some variable (e.g. ENVFS_LOOKUP_ALL) is set in the requesting process environment? I may try to send a PR if you're not against.