ENH: query_installed_packages can also consider externally hosted packages

share/fsl/sbin/update_fsl_package

@@ -246,10 +246,13 @@ class Package:
 
 
 @ft.lru_cache
-def query_installed_packages() -> Dict[str, Package]:
+def query_installed_packages(include_external : bool) -> Dict[str, Package]:
     """Uses conda to find out the versions of all packages installed in
     $FSLDIR, which are sourced from the FSL conda channels.
 
+    If "include_external" is True, externally hosted packages that are listed
+    in EXTERNALLY_HOSTED_PACKAGES are also queried.
+
     Returns a dict of {pkgname : Package} mappings. The "dependencies"
     attributes of the package objects are not populated.
     """
@@ -270,8 +273,11 @@ def query_installed_packages() -> Dict[str, Package]:
     # or those listed in the externally
     # hosted package list.
     for pkg in info:
-        if pkg['base_url'].rstrip() in channels or \
-           pkg['name']              in EXTERNALLY_HOSTED_PACKAGES:
+
+        internal = pkg['base_url'].rstrip() in channels
+        external = pkg['name']              in EXTERNALLY_HOSTED_PACKAGES
+
+        if internal or (external and include_external):
             pkgs[pkg['name']] = Package(pkg['name'],
                                         pkg['version'],
                                         pkg['channel'],
@@ -565,7 +571,7 @@ def main(argv : Sequence[str] = None):
     # Download information about all
     # available packages on the FSL
     # conda channels.
-    print('Downloading FSL conda channel information ...')
+    print('Downloading FSL conda channel metadata ...')
     channeldata = [download_channel_metadata(PUBLIC_FSL_CHANNEL)]
     if args.internal:
         channeldata.insert(0, download_channel_metadata(
@@ -574,8 +580,10 @@ def main(argv : Sequence[str] = None):
             password=args.password))
 
     print('Building FSL package list ...')
-    if args.all: packages = list(query_installed_packages().keys())
-    else:        packages = args.package
+    if args.all:
+        packages = list(query_installed_packages(args.external).keys())
+    else:
+        packages = args.package
 
     # Identify the versions that are
     # available for the packages the