Get rid of `.drv` special-casing for store path installables

The release notes document the change in behavior, I don't include it
here so there is no risk to it getting out of sync.

> Motivation

>> Plumbing CLI should be simple

Store derivation installations are intended as "plumbing": very simple
utilities for advanced users and scripts, and not what regular users
interact with. (Similarly, regular Git users will use branch and tag
names not explicit hashes for most things.)

The plumbing CLI should prize simplicity over convenience; that is its
raison d'etre. If the user provides a path, we should treat it the same
way not caring what sort of path it is.

>> Scripting

This is especially important for the scripting use-case. when arbitrary
paths are sent to e.g. `nix copy` and the script author wants consistent
behavior regardless of what those store paths are. Otherwise the script
author needs to be careful to filter out `.drv` ones, and then run `nix
copy` again with those paths and `--derivation`. That is not good!

>> Surprisingly low impact

Only two lines in the tests need changing, showing that the impact of
this is pretty light.

Many command, like `nix log` will continue to work with just the
derivation passed as before. This because we used to:

- Special case the drv path and replace it with it's outputs (what this
  gets rid of).

- Turn those output path *back* into the original drv path.

Now we just skip that entire round trip!

> Context

Issue #7261 lays out a broader vision for getting rid of `--derivation`,
and has this as one of its dependencies. But we can do this with or
without that.

`Installable::toDerivations` is changed to handle the case of a
`DerivedPath::Opaque` ending in `.drv`, which is new: it simply doesn't
need to do any extra work in that case. On this basis, commands like
`nix {show-derivation,log} /nix/store/...-foo.drv` still work as before,
as described above.

When testing older daemons, the post-build-hook will be run against the
old CLI, so we need the old version of the post-build-hook to support
that use-case.

Co-authored-by: Travis A. Everett <travis.a.everett@gmail.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>

2 files changed, 21 insertions, 21 deletions

diff --git a/src/libcmd/installable-derived-path.cc b/src/libcmd/installable-derived-path.cc
index a9921b901..729dc7d31 100644
--- a/src/libcmd/installable-derived-path.cc
+++ b/src/libcmd/installable-derived-path.cc
@@ -31,27 +31,24 @@ InstallableDerivedPath InstallableDerivedPath::parse(
     ExtendedOutputsSpec extendedOutputsSpec)
 {
     auto derivedPath = std::visit(overloaded {
-        // If the user did not use ^, we treat the output more liberally.
+        // If the user did not use ^, we treat the output more
+        // liberally: we accept a symlink chain or an actual
+        // store path.
         [&](const ExtendedOutputsSpec::Default &) -> DerivedPath {
-            // First, we accept a symlink chain or an actual store path.
             auto storePath = store->followLinksToStorePath(prefix);
-            // Second, we see if the store path ends in `.drv` to decide what sort
-            // of derived path they want.
-            //
-            // This handling predates the `^` syntax. The `^*` in
-            // `/nix/store/hash-foo.drv^*` unambiguously means "do the
-            // `DerivedPath::Built` case", so plain `/nix/store/hash-foo.drv` could
-            // also unambiguously mean "do the DerivedPath::Opaque` case".
-            //
-            // Issue #7261 tracks reconsidering this `.drv` dispatching.
-            return storePath.isDerivation()
-                ? (DerivedPath) DerivedPath::Built {
-                    .drvPath = std::move(storePath),
-                    .outputs = OutputsSpec::All {},
-                }
-                : (DerivedPath) DerivedPath::Opaque {
-                    .path = std::move(storePath),
+            // Remove this prior to stabilizing the new CLI.
+            if (storePath.isDerivation()) {
+                auto oldDerivedPath = DerivedPath::Built {
+                    .drvPath = storePath,
+                    .outputs = OutputsSpec::All { },
                 };
+                warn(
+                    "The interpretation of store paths arguments ending in `.drv` recently changed. If this command is now failing try again with '%s'",
+                    oldDerivedPath.to_string(*store));
+            };
+            return DerivedPath::Opaque {
+                .path = std::move(storePath),
+            };
         },
         // If the user did use ^, we just do exactly what is written.
         [&](const ExtendedOutputsSpec::Explicit & outputSpec) -> DerivedPath {
diff --git a/src/libcmd/installables.cc b/src/libcmd/installables.cc
index 00c6f9516..90f001902 100644
--- a/src/libcmd/installables.cc
+++ b/src/libcmd/installables.cc
@@ -677,9 +677,12 @@ StorePathSet Installable::toDerivations(
         for (const auto & b : i->toDerivedPaths())
             std::visit(overloaded {
                 [&](const DerivedPath::Opaque & bo) {
-                    if (!useDeriver)
-                        throw Error("argument '%s' did not evaluate to a derivation", i->what());
-                    drvPaths.insert(getDeriver(store, *i, bo.path));
+                    drvPaths.insert(
+                        bo.path.isDerivation()
+                            ? bo.path
+                        : useDeriver
+                            ? getDeriver(store, *i, bo.path)
+                        : throw Error("argument '%s' did not evaluate to a derivation", i->what()));
                 },
                 [&](const DerivedPath::Built & bfd) {
                     drvPaths.insert(bfd.drvPath);