spack find: add options for local/upstream only (#42999)

Users requested an option to filter between local/upstream results in `spack find` output.

```
# default behavior, same as without --install-tree argument
$ spack find --install-tree all

# show only local results
$ spack find --install-tree local  

# show results from all upstreams
$ spack find --install-tree upstream 

# show results from a particular upstream or the local install_tree
$ spack find --install-tree /path/to/install/tree/root
```

---------

Co-authored-by: becker33 <becker33@users.noreply.github.com>

2 files changed, 4 insertions, 2 deletions

diff --git a/share/spack/spack-completion.bash b/share/spack/spack-completion.bash
index 1319d1685f..dc0d1987a6 100755
--- a/share/spack/spack-completion.bash
+++ b/share/spack/spack-completion.bash
@@ -1179,7 +1179,7 @@ _spack_fetch() {
 _spack_find() {
     if $list_options
     then
-        SPACK_COMPREPLY="-h --help --format -H --hashes --json -d --deps -p --paths --groups --no-groups -l --long -L --very-long -t --tag -N --namespaces -c --show-concretized -f --show-flags --show-full-compiler -x --explicit -X --implicit -u --unknown -m --missing -v --variants --loaded -M --only-missing --deprecated --only-deprecated --start-date --end-date"
+        SPACK_COMPREPLY="-h --help --format -H --hashes --json -d --deps -p --paths --groups --no-groups -l --long -L --very-long -t --tag -N --namespaces -c --show-concretized -f --show-flags --show-full-compiler -x --explicit -X --implicit -u --unknown -m --missing -v --variants --loaded -M --only-missing --deprecated --only-deprecated --install-tree --start-date --end-date"
     else
         _installed_packages
     fi
diff --git a/share/spack/spack-completion.fish b/share/spack/spack-completion.fish
index 47e6fccb31..ff7c3b3ba1 100755
--- a/share/spack/spack-completion.fish
+++ b/share/spack/spack-completion.fish
@@ -1721,7 +1721,7 @@ complete -c spack -n '__fish_spack_using_command fetch' -l deprecated -f -a conf
 complete -c spack -n '__fish_spack_using_command fetch' -l deprecated -d 'allow concretizer to select deprecated versions'
 
 # spack find
-set -g __fish_spack_optspecs_spack_find h/help format= H/hashes json d/deps p/paths groups no-groups l/long L/very-long t/tag= N/namespaces c/show-concretized f/show-flags show-full-compiler x/explicit X/implicit u/unknown m/missing v/variants loaded M/only-missing deprecated only-deprecated start-date= end-date=
+set -g __fish_spack_optspecs_spack_find h/help format= H/hashes json d/deps p/paths groups no-groups l/long L/very-long t/tag= N/namespaces c/show-concretized f/show-flags show-full-compiler x/explicit X/implicit u/unknown m/missing v/variants loaded M/only-missing deprecated only-deprecated install-tree= start-date= end-date=
 complete -c spack -n '__fish_spack_using_command_pos_remainder 0 find' -f -a '(__fish_spack_installed_specs)'
 complete -c spack -n '__fish_spack_using_command find' -s h -l help -f -a help
 complete -c spack -n '__fish_spack_using_command find' -s h -l help -d 'show this help message and exit'
@@ -1771,6 +1771,8 @@ complete -c spack -n '__fish_spack_using_command find' -l deprecated -f -a depre
 complete -c spack -n '__fish_spack_using_command find' -l deprecated -d 'show deprecated packages as well as installed specs'
 complete -c spack -n '__fish_spack_using_command find' -l only-deprecated -f -a only_deprecated
 complete -c spack -n '__fish_spack_using_command find' -l only-deprecated -d 'show only deprecated packages'
+complete -c spack -n '__fish_spack_using_command find' -l install-tree -r -f -a install_tree
+complete -c spack -n '__fish_spack_using_command find' -l install-tree -r -d 'Install trees to query: \'all\' (default), \'local\', \'upstream\', upstream name or path'
 complete -c spack -n '__fish_spack_using_command find' -l start-date -r -f -a start_date
 complete -c spack -n '__fish_spack_using_command find' -l start-date -r -d 'earliest date of installation [YYYY-MM-DD]'
 complete -c spack -n '__fish_spack_using_command find' -l end-date -r -f -a end_date