Esy itself doesn't critically need symlinks. Tarring/untarring of sources are a bigger issue. For instance, (pasting logs from slow-tests)

 ** Iteration: 2
EXEC: C:/Users/manas/development/esy/bin/esy.cmd install
info install 0.6.0 (using esy.json)
info fetching: done
error command failed: "tar" "xf" "/cygdrive/c/Users/manas/AppData/Local/Temp/2ae948cf0d340541/reason/_esy/default/dist/f34f64b259f0f67c9f07cb2331f9cbf8" "-C" "/cygdrive/c/Users/manas/AppData/Local/Temp/esy-fdd963"
      stderr:
               tar: ocamlbuild-0.14.0/examples/07-dependent-projects/libdemo: Cannot create symlink to '../04-library/libdemo': Operation not permitted
               tar: Exiting with failure status due to previous errors

      stdout:

error: error running command
  unpacking @opam/ocamlbuild@opam:0.14.0
  installing @opam/ocamlbuild@opam:0.14.0
esy: exiting due to errors above
Exception: Error: Command failed: C:/Users/manas/development/esy/bin/esy.cmd install
 ** Iteration: 3
EXEC: C:/Users/manas/development/esy/bin/esy.cmd install
info install 0.6.0 (using esy.json)
info fetching: done
error command failed: "tar" "xf" "/cygdrive/c/Users/manas/AppData/Local/Temp/2ae948cf0d340541/reason/_esy/default/dist/f34f64b259f0f67c9f07cb2331f9cbf8" "-C" "/cygdrive/c/Users/manas/AppData/Local/Temp/esy-1d6681"
      stderr:
               tar: ocamlbuild-0.14.0/examples/07-dependent-projects/libdemo: Cannot create symlink to '../04-library/libdemo': Operation not permitted
               tar: Exiting with failure status due to previous errors

      stdout:

error: error running command
  unpacking @opam/ocamlbuild@opam:0.14.0
  installing @opam/ocamlbuild@opam:0.14.0
esy: exiting due to errors above

GNU tar seems to rely on symlinks

Uh oh!

Windows - Symlink Issues #389

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