X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/63f9b5374e01394486a07dba4f9a43cfd76707e3..42c20b25e1325124b88e3b9b285544dc41122b56:/apps/workbench/app/models/repository.rb

diff --git a/apps/workbench/app/models/repository.rb b/apps/workbench/app/models/repository.rb
index 06c70f4688..fd30be9462 100644
--- a/apps/workbench/app/models/repository.rb
+++ b/apps/workbench/app/models/repository.rb
@@ -1,5 +1,119 @@
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
 class Repository < ArvadosBase
   def self.creatable?
-    current_user and current_user.is_admin
+    false
+  end
+  def attributes_for_display
+    super.reject { |x| x[0] == 'fetch_url' }
+  end
+  def editable_attributes
+    if current_user.is_admin
+      super
+    else
+      []
+    end
+  end
+
+  def show commit_sha1
+    refresh
+    run_git 'show', commit_sha1
+  end
+
+  def cat_file commit_sha1, path
+    refresh
+    run_git 'cat-file', 'blob', commit_sha1 + ':' + path
+  end
+
+  def ls_tree_lr commit_sha1
+    refresh
+    run_git 'ls-tree', '-l', '-r', commit_sha1
+  end
+
+  # subtree returns a list of files under the given path at the
+  # specified commit. Results are returned as an array of file nodes,
+  # where each file node is an array [file mode, blob sha1, file size
+  # in bytes, path relative to the given directory]. If the path is
+  # not found, [] is returned.
+  def ls_subtree commit, path
+    path = path.chomp '/'
+    subtree = []
+    ls_tree_lr(commit).each_line do |line|
+      mode, type, sha1, size, filepath = line.split
+      next if type != 'blob'
+      if filepath[0,path.length] == path and
+          (path == '' or filepath[path.length] == '/')
+        subtree << [mode.to_i(8), sha1, size.to_i,
+                    filepath[path.length,filepath.length]]
+      end
+    end
+    subtree
+  end
+
+  # http_fetch_url returns the first http:// or https:// url (if any)
+  # in the api response's clone_urls attribute.
+  def http_fetch_url
+    clone_urls.andand.select { |u| /^http/ =~ u }.first
+  end
+
+  protected
+
+  # refresh fetches the latest repository content into the local
+  # cache. It is a no-op if it has already been run on this object:
+  # this (pretty much) avoids doing more than one remote git operation
+  # per Workbench request.
+  def refresh
+    run_git 'fetch', http_fetch_url, '+*:*' unless @fresh
+    @fresh = true
+  end
+
+  # run_git sets up the ARVADOS_API_TOKEN environment variable,
+  # creates a local git directory for this repository if necessary,
+  # executes "git --git-dir localgitdir {args to run_git}", and
+  # returns the output. It raises GitCommandError if git exits
+  # non-zero.
+  def run_git *gitcmd
+    if not @workdir
+      workdir = File.expand_path uuid+'.git', Rails.configuration.Workbench.RepositoryCache
+      if not File.exists? workdir
+        FileUtils.mkdir_p Rails.configuration.Workbench.RepositoryCache
+        [['git', 'init', '--bare', workdir],
+        ].each do |cmd|
+          system(*cmd, in: "/dev/null")
+          raise GitCommandError.new($?.to_s) unless $?.exitstatus == 0
+        end
+      end
+      @workdir = workdir
+    end
+    [['git', '--git-dir', @workdir, 'config', '--local',
+      "credential.#{http_fetch_url}.username", 'none'],
+     ['git', '--git-dir', @workdir, 'config', '--local',
+      "credential.#{http_fetch_url}.helper",
+      '!cred(){ cat >/dev/null; if [ "$1" = get ]; then echo password=$ARVADOS_API_TOKEN; fi; };cred'],
+     ['git', '--git-dir', @workdir, 'config', '--local',
+           'http.sslVerify',
+           Rails.configuration.TLS.Insecure ? 'false' : 'true'],
+     ].each do |cmd|
+      system(*cmd, in: "/dev/null")
+      raise GitCommandError.new($?.to_s) unless $?.exitstatus == 0
+    end
+    env = {}.
+      merge(ENV).
+      merge('ARVADOS_API_TOKEN' => Thread.current[:arvados_api_token],
+            'GIT_TERMINAL_PROMPT' => '0')
+    cmd = ['git', '--git-dir', @workdir] + gitcmd
+    io = IO.popen(env, cmd, err: [:child, :out], in: "/dev/null")
+    output = io.read
+    io.close
+    # "If [io] is opened by IO.popen, close sets $?." --ruby 2.2.1 docs
+    unless $?.exitstatus == 0
+      raise GitCommandError.new("`git #{gitcmd.join ' '}` #{$?}: #{output}")
+    end
+    output
+  end
+
+  class GitCommandError < StandardError
   end
 end