allow install of build-deps from cache via --include-build-deps switch (#19955)

* allow install of build-deps from cache via --include-build-deps switch

* make clear that --include-build-deps is useful for CI pipeline troubleshooting

3 files changed, 9 insertions, 3 deletions

diff --git a/lib/spack/spack/cmd/install.py b/lib/spack/spack/cmd/install.py
index 8f3902d71c..0957c75212 100644
--- a/lib/spack/spack/cmd/install.py
+++ b/lib/spack/spack/cmd/install.py
@@ -43,6 +43,7 @@ def update_kwargs_from_args(args, kwargs):
         'dirty': args.dirty,
         'use_cache': args.use_cache,
         'cache_only': args.cache_only,
+        'include_build_deps': args.include_build_deps,
         'explicit': True,  # Always true for install command
         'stop_at': args.until,
         'unsigned': args.unsigned,
@@ -106,6 +107,11 @@ the dependencies"""
         help="only install package from binary mirrors")
 
     subparser.add_argument(
+        '--include-build-deps', action='store_true', dest='include_build_deps',
+        default=False, help="""include build deps when installing from cache,
+which is useful for CI pipeline troubleshooting""")
+
+    subparser.add_argument(
         '--no-check-signature', action='store_true',
         dest='unsigned', default=False,
         help="do not check signatures of binary packages")
diff --git a/lib/spack/spack/installer.py b/lib/spack/spack/installer.py
index b70528dea2..1d8c637d32 100644
--- a/lib/spack/spack/installer.py
+++ b/lib/spack/spack/installer.py
@@ -1367,7 +1367,6 @@ class PackageInstaller(object):
 
             pkg, pkg_id, spec = task.pkg, task.pkg_id, task.pkg.spec
             tty.verbose('Processing {0}: task={1}'.format(pkg_id, task))
-
             # Ensure that the current spec has NO uninstalled dependencies,
             # which is assumed to be reflected directly in its priority.
             #
@@ -1967,7 +1966,8 @@ class BuildRequest(object):
             (tuple) required dependency type(s) for the package
         """
         deptypes = ['link', 'run']
-        if not self.install_args.get('cache_only'):
+        include_build_deps = self.install_args.get('include_build_deps')
+        if not self.install_args.get('cache_only') or include_build_deps:
             deptypes.append('build')
         if self.run_tests(pkg):
             deptypes.append('test')
diff --git a/share/spack/spack-completion.bash b/share/spack/spack-completion.bash
index bf44039ad9..7697cacdc3 100755
--- a/share/spack/spack-completion.bash
+++ b/share/spack/spack-completion.bash
@@ -1020,7 +1020,7 @@ _spack_info() {
 _spack_install() {
     if $list_options
     then
-        SPACK_COMPREPLY="-h --help --only -u --until -j --jobs --overwrite --fail-fast --keep-prefix --keep-stage --dont-restage --use-cache --no-cache --cache-only --no-check-signature --require-full-hash-match --show-log-on-error --source -n --no-checksum -v --verbose --fake --only-concrete -f --file --clean --dirty --test --run-tests --log-format --log-file --help-cdash --cdash-upload-url --cdash-build --cdash-site --cdash-track --cdash-buildstamp -y --yes-to-all"
+        SPACK_COMPREPLY="-h --help --only -u --until -j --jobs --overwrite --fail-fast --keep-prefix --keep-stage --dont-restage --use-cache --no-cache --cache-only --include-build-deps --no-check-signature --require-full-hash-match --show-log-on-error --source -n --no-checksum -v --verbose --fake --only-concrete -f --file --clean --dirty --test --run-tests --log-format --log-file --help-cdash --cdash-upload-url --cdash-build --cdash-site --cdash-track --cdash-buildstamp -y --yes-to-all"
     else
         _all_packages
     fi