adding --fingerprint option for autoproj versions

lib/autoproj/cli/main.rb

@@ -377,6 +377,8 @@ def osdeps(*packages)
                 desc: 'whether we should access the remote server to verify that the snapshotted state is present'
             option :save, type: :string,
                 desc: 'save to the given file instead of displaying it on the standard output'
+            option :fingerprint, type: :boolean, default: false,
+                desc: 'calculate unique fingerprint for each package'
             def versions(*packages)
                 run_autoproj_cli(:versions, :Versions, Hash[], *packages, deps: true)
             end

lib/autoproj/cli/versions.rb

@@ -51,7 +51,10 @@ def run(user_selection, options)
                     versions += ops.snapshot_package_sets(nil, only_local: options[:only_local])
                 end
                 if snapshot_packages
-                    versions += ops.snapshot_packages(packages, nil, only_local: options[:only_local])
+                    versions += ops.snapshot_packages(packages, 
+                        nil, 
+                        only_local: options[:only_local],
+                        fingerprint: options[:fingerprint])
                 end
 
                 if output_file = options[:save]

lib/autoproj/ops/snapshot.rb

@@ -117,7 +117,7 @@ def error_or_warn(package, error)
             end
         end
 
-        def snapshot_packages(packages, target_dir = nil, only_local: true)
+        def snapshot_packages(packages, target_dir = nil, only_local: true, fingerprint: false)
             result = Array.new
             packages.each do |package_name|
                 package  = manifest.find_package_definition(package_name)
@@ -140,7 +140,9 @@ def snapshot_packages(packages, target_dir = nil, only_local: true)
                         next
                     end
 
-                vcs_info['fingerprint'] = package.autobuild.fingerprint
+                if fingerprint
+                    vcs_info['fingerprint'] = package.autobuild.fingerprint
+                end
 
                 if vcs_info
                     result << Hash[package_name, vcs_info]

shell/completion/autoproj_bash

@@ -1062,6 +1062,7 @@ __autoproj_versions() {
         --local
         --no-local
         --save
+        --fingerprint
     "
 
     case "$cur" in

shell/completion/autoproj_zsh

@@ -698,6 +698,7 @@ __autoproj_versions() {
     {--deps,--no-deps}'[whether both packages and their dependencies should be versioned, or only the selected packages (the latter is the default)]' \
     {--local,--no-local}'[whether we should access the remote server to verify that the snapshotted state is present]' \
     --save'[save to the given file instead of displaying it on the standard output]' \
+    --fingerprint'[calculate unique fingerprint for each package]' \
     '*:arg:_autoproj_installed_packages'
 }