emacs hexl-mode

[evrim]

Issue description

emacs 25.1 hexl mode does not work, wrapper failure.

Steps to reproduce

M-x hexl-mode
Searching for program: No such file or directory, /nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/emacs/25.1/x86_64-unknown-linux-gnu/hexl

$ find /nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu/update-game-score
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu/profile
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu/movemail
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu/hexl
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu/rcs2log
/nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/emacs

Technical details

17.03.1123.4a7a03913d (Gorilla)

[evrim]

seems like emacs is looking for a wrong path for hexl. any suggestions to fix it in .emacs.d/init.el?

[pbogdan]

I haven't tried it but perhaps you can use hexl-program variable to override the path, and point it at /nix/store/jkh5n5f7fw64rfkbb28nr82klpvjl9zp-emacs-25.1/libexec/.emacs-wrapped/25.1/x86_64-unknown-linux-gnu/hexl (with the downside of needing to be updated if the hash of the package changes for any reason).

hexl-program is a variable defined in ‘hexl.el’.
Its value is "hexl"

  This variable may be risky if used as a file-local variable.

Documentation:
The program that will hexlify and dehexlify its stdin.
‘hexl-program’ will always be concatenated with ‘hexl-options’
and "-de" when dehexlifying a buffer.

You can customize this variable.

[ttuegel]

This is actually a bug in wrapGAppsHook. It is generating a wrapper for the directory libexec/emacs, probably because it is "executable" and so the wrapper generator thinks it should be wrapped.

EDIT: This has been fixed in master, it looks like we only need to backport that fix to release-17.03.