cmd/solve: use interface from cmd/spec (#47182)

Currently, `spack solve` has different spec selection semantics than `spack spec`.
`spack solve` currently does not allow specifying a single spec when an environment is active.

This PR modifies `spack solve` to inherit the interface from `spack spec`, and to use
the same spec selection logic. This will allow for better use of `spack solve --show opt`
for debugging.

---------

Co-authored-by: Todd Gamblin <tgamblin@llnl.gov>

2 files changed, 20 insertions, 59 deletions

diff --git a/lib/spack/spack/cmd/solve.py b/lib/spack/spack/cmd/solve.py
index f5a9c09c3d..8adc06fdfb 100644
--- a/lib/spack/spack/cmd/solve.py
+++ b/lib/spack/spack/cmd/solve.py
@@ -3,7 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-import argparse
 import re
 import sys
 
@@ -12,13 +11,12 @@ import llnl.util.tty.color as color
 
 import spack
 import spack.cmd
-import spack.cmd.common.arguments
+import spack.cmd.spec
 import spack.config
 import spack.environment
 import spack.hash_types as ht
 import spack.solver.asp as asp
 import spack.spec
-from spack.cmd.common import arguments
 
 description = "concretize a specs using an ASP solver"
 section = "developer"
@@ -41,42 +39,6 @@ def setup_parser(subparser):
         "  solutions    models found by asp program\n"
         "  all          all of the above",
     )
-
-    # Below are arguments w.r.t. spec display (like spack spec)
-    arguments.add_common_arguments(subparser, ["long", "very_long", "namespaces"])
-
-    install_status_group = subparser.add_mutually_exclusive_group()
-    arguments.add_common_arguments(install_status_group, ["install_status", "no_install_status"])
-
-    subparser.add_argument(
-        "-y",
-        "--yaml",
-        action="store_const",
-        dest="format",
-        default=None,
-        const="yaml",
-        help="print concrete spec as yaml",
-    )
-    subparser.add_argument(
-        "-j",
-        "--json",
-        action="store_const",
-        dest="format",
-        default=None,
-        const="json",
-        help="print concrete spec as json",
-    )
-    subparser.add_argument(
-        "-c",
-        "--cover",
-        action="store",
-        default="nodes",
-        choices=["nodes", "edges", "paths"],
-        help="how extensively to traverse the DAG (default: nodes)",
-    )
-    subparser.add_argument(
-        "-t", "--types", action="store_true", default=False, help="show dependency types"
-    )
     subparser.add_argument(
         "--timers",
         action="store_true",
@@ -86,9 +48,8 @@ def setup_parser(subparser):
     subparser.add_argument(
         "--stats", action="store_true", default=False, help="print out statistics from clingo"
     )
-    subparser.add_argument("specs", nargs=argparse.REMAINDER, help="specs of packages")
 
-    spack.cmd.common.arguments.add_concretizer_args(subparser)
+    spack.cmd.spec.setup_parser(subparser)
 
 
 def _process_result(result, show, required_format, kwargs):
@@ -164,11 +125,12 @@ def solve(parser, args):
 
     # If we have an active environment, pick the specs from there
     env = spack.environment.active_environment()
-    if env and args.specs:
-        msg = "cannot give explicit specs when an environment is active"
-        raise RuntimeError(msg)
-
-    specs = list(env.user_specs) if env else spack.cmd.parse_specs(args.specs)
+    if args.specs:
+        specs = spack.cmd.parse_specs(args.specs)
+    elif env:
+        specs = list(env.user_specs)
+    else:
+        tty.die("spack solve requires at least one spec or an active environment")
 
     solver = asp.Solver()
     output = sys.stdout if "asp" in show else None
diff --git a/lib/spack/spack/cmd/spec.py b/lib/spack/spack/cmd/spec.py
index e5cc951d69..188e536088 100644
--- a/lib/spack/spack/cmd/spec.py
+++ b/lib/spack/spack/cmd/spec.py
@@ -96,26 +96,25 @@ def spec(parser, args):
     if args.install_status:
         tree_context = spack.store.STORE.db.read_transaction
 
-    # Use command line specified specs, otherwise try to use environment specs.
+    env = ev.active_environment()
+
     if args.specs:
         input_specs = spack.cmd.parse_specs(args.specs)
         concretized_specs = spack.cmd.parse_specs(args.specs, concretize=True)
         specs = list(zip(input_specs, concretized_specs))
-    else:
-        env = ev.active_environment()
-        if env:
-            env.concretize()
-            specs = env.concretized_specs()
+    elif env:
+        env.concretize()
+        specs = env.concretized_specs()
 
+        if not args.format:
             # environments are printed together in a combined tree() invocation,
             # except when using --yaml or --json, which we print spec by spec below.
-            if not args.format:
-                tree_kwargs["key"] = spack.traverse.by_dag_hash
-                tree_kwargs["hashes"] = args.long or args.very_long
-                print(spack.spec.tree([concrete for _, concrete in specs], **tree_kwargs))
-                return
-        else:
-            tty.die("spack spec requires at least one spec or an active environment")
+            tree_kwargs["key"] = spack.traverse.by_dag_hash
+            tree_kwargs["hashes"] = args.long or args.very_long
+            print(spack.spec.tree([concrete for _, concrete in specs], **tree_kwargs))
+            return
+    else:
+        tty.die("spack spec requires at least one spec or an active environment")
 
     for input, output in specs:
         # With --yaml or --json, just print the raw specs to output