feature: installation --prefix via env var

With `dune install` you must either provide the installation `--prefix` or have `opam` installed. Unfortunately in some cases neither is an option because we're in a non-Opam environment (e.g. Nix) and don't control the invocation of Dune. Providing an environment variable `DUNE_INSTALL_PREFIX` may alleviate that pain. Might help some suffering from #5455. Signed-off-by: Ole Krüger <[email protected]> ps-id: 2D3AA66B-4717-45EE-884B-F22F9D6008C8
ocaml · Apr 21, 2022 · c4818a8 · c4818a8
1 parent 921cf99
commit c4818a8
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diff --git a/CHANGES.md b/CHANGES.md
@@ -1,3 +1,9 @@
+3.2.0 (Unreleased)
+-----------------
+
+- Allow to specify `--prefix` via the environment variable
+  `DUNE_INSTALL_PREFIX` (#5589, @vapourismo)
+
 3.1.1 (19/04/2022)
 ------------------
 

diff --git a/bin/install_uninstall.ml b/bin/install_uninstall.ml
@@ -390,7 +390,9 @@ let install_uninstall ~what =
       Arg.(
         value
         & opt (some string) None
-        & info [ "prefix" ] ~docv:"PREFIX"
+        & info [ "prefix" ]
+            ~env:(env_var "DUNE_INSTALL_PREFIX")
+            ~docv:"PREFIX"
             ~doc:
               "Directory where files are copied. For instance binaries are \
                copied into $(i,\\$prefix/bin), library files into \