Enable/disable bootstrapping and customize store location (#23677)

* Permit to enable/disable bootstrapping and customize store location

This PR adds configuration handles to allow enabling
and disabling bootstrapping, and to customize the store
location.

* Move bootstrap related configuration into its own YAML file

* Add a bootstrap command to manage configuration

1 files changed, 31 insertions, 1 deletions

diff --git a/share/spack/spack-completion.bash b/share/spack/spack-completion.bash
index cd5a01c42d..44cc7945fd 100755
--- a/share/spack/spack-completion.bash
+++ b/share/spack/spack-completion.bash
@@ -333,7 +333,7 @@ _spack() {
     then
         SPACK_COMPREPLY="-h --help -H --all-help --color -c --config -C --config-scope -d --debug --timestamp --pdb -e --env -D --env-dir -E --no-env --use-env-repo -k --insecure -l --enable-locks -L --disable-locks -m --mock -p --profile --sorted-profile --lines -v --verbose --stacktrace -V --version --print-shell-vars"
     else
-        SPACK_COMPREPLY="activate add analyze arch audit blame build-env buildcache cd checksum ci clean clone commands compiler compilers concretize config containerize create deactivate debug dependencies dependents deprecate dev-build develop docs edit env extensions external fetch find flake8 gc gpg graph help info install license list load location log-parse maintainers mark mirror module monitor patch pkg providers pydoc python reindex remove rm repo resource restage solve spec stage style test test-env tutorial undevelop uninstall unit-test unload url verify versions view"
+        SPACK_COMPREPLY="activate add analyze arch audit blame bootstrap build-env buildcache cd checksum ci clean clone commands compiler compilers concretize config containerize create deactivate debug dependencies dependents deprecate dev-build develop docs edit env extensions external fetch find flake8 gc gpg graph help info install license list load location log-parse maintainers mark mirror module monitor patch pkg providers pydoc python reindex remove rm repo resource restage solve spec stage style test test-env tutorial undevelop uninstall unit-test unload url verify versions view"
     fi
 }
 
@@ -416,6 +416,36 @@ _spack_blame() {
     fi
 }
 
+_spack_bootstrap() {
+    if $list_options
+    then
+        SPACK_COMPREPLY="-h --help"
+    else
+        SPACK_COMPREPLY="enable disable reset root"
+    fi
+}
+
+_spack_bootstrap_enable() {
+    SPACK_COMPREPLY="-h --help --scope"
+}
+
+_spack_bootstrap_disable() {
+    SPACK_COMPREPLY="-h --help --scope"
+}
+
+_spack_bootstrap_reset() {
+    SPACK_COMPREPLY="-h --help -y --yes-to-all"
+}
+
+_spack_bootstrap_root() {
+    if $list_options
+    then
+        SPACK_COMPREPLY="-h --help --scope"
+    else
+        SPACK_COMPREPLY=""
+    fi
+}
+
 _spack_build_env() {
     if $list_options
     then