wizard/command/upgrade.py

   1 import optparse
   2 import sys
   3 import os
   4 import shutil
   5 import logging.handlers
   6 import errno
   7 import tempfile
   8 import itertools
   9
  10 from wizard import command, deploy, shell, util
  11
  12 # XXX: need errors for history sanity checking (if the user is on a completely
  13 # different history tree, we should abort, and manually figure out the
  14 # appropriate rebase)
  15
  16 def main(argv, baton):
  17     options, args = parse_args(argv, baton)
  18     if args:
  19         command.chdir(args[0])
  20     sh = shell.Shell()
  21     util.set_git_env()
  22     if options.continue_:
  23         temp_wc_dir = os.getcwd()
  24         user_commit, next_commit = open(".git/WIZARD_PARENTS", "r").read().split()
  25         repo = open(".git/WIZARD_REPO", "r").read()
  26         version = open(".git/WIZARD_UPGRADE_VERSION", "r").read()
  27         command.chdir(sh.eval("git", "config", "remote.origin.url"))
  28     else:
  29         d = make_deployment_from_cwd()
  30         repo = d.application.repository(options.srv_path)
  31         version = calculate_newest_version(sh, repo)
  32         if not options.dry_run:
  33             perform_pre_commit(sh)
  34         temp_wc_dir = perform_tmp_clone(sh)
  35         with util.ChangeDirectory(temp_wc_dir):
  36             if options.dry_run:
  37                 # we delayed performing the pre upgrade commit
  38                 # until we're in the temporary directory
  39                 perform_pre_commit(sh)
  40             sh.call("git", "remote", "add", "scripts", repo)
  41             sh.call("git", "fetch", "scripts")
  42             user_commit, next_commit = calculate_parents(sh, version)
  43             # save variables so that --continue will work
  44             # yeah yeah no trailing newline whatever
  45             open(".git/WIZARD_REPO", "w").write(repo)
  46             open(".git/WIZARD_UPGRADE_VERSION", "w").write(version)
  47             open(".git/WIZARD_PARENTS", "w").write("%s\n%s" % (user_commit, next_commit))
  48             perform_merge(sh, repo, d, version)
  49     # variables: version, user_commit, next_commit, temp_wc_dir
  50     with util.ChangeDirectory(temp_wc_dir):
  51         message = make_commit_message(version)
  52         new_tree = sh.eval("git", "rev-parse", "HEAD^{tree}")
  53         final_commit = sh.eval("git", "commit-tree", new_tree, "-p", user_commit, "-p", next_commit, input=message)
  54         # a master branch may not necessarily exist if the user
  55         # was manually installed to an earlier version
  56         try:
  57             sh.call("git", "checkout", "-b", "master", "--")
  58         except shell.CallError:
  59             sh.call("git", "checkout", "master", "--")
  60         sh.call("git", "reset", "--hard", final_commit)
  61     # Till now, all of our operations were in a tmp sandbox.
  62     if options.dry_run:
  63         logging.info("Dry run, bailing.  See results at %s" % temp_wc_dir)
  64         return
  65     # XXX: frob .htaccess to make site inaccessible
  66     # git merge (which performs a fast forward)
  67     #   - merge could fail (race); that's /really/ dangerous.
  68     sh.call("git", "pull", temp_wc_dir, "master")
  69     # run update script
  70     sh.call(".scripts/update")
  71     # XXX: frob .htaccess to make site accessible
  72     # XXX:  - check if .htaccess changed, first.  Upgrade
  73     #       process might have frobbed it.  Don't be
  74     #       particularly worried if the segment dissappeared
  75
  76 def make_deployment_from_cwd():
  77     if not os.path.isdir(".git"):
  78         raise NotAutoinstallError()
  79     try:
  80         d = deploy.Deployment(".")
  81     except IOError as e:
  82         if e.errno == errno.ENOENT:
  83             raise NotAutoinstallError()
  84         else: raise e
  85     return d
  86
  87 def make_commit_message(version):
  88     message = "Upgraded autoinstall in %s to %s.\n\n%s" % (util.get_dir_owner(), version, util.get_git_footer())
  89     try:
  90         message += "\nUpgraded-by: " + util.get_operator_git()
  91     except util.NoOperatorInfo:
  92         pass
  93     return message
  94
  95 def calculate_newest_version(sh, repo):
  96     return sh.eval("git", "--git-dir="+repo, "describe", "--tags", "master")
  97
  98 def calculate_parents(sh, version):
  99     user_commit = sh.eval("git", "rev-parse", "HEAD")
 100     next_commit = sh.eval("git", "rev-parse", version)
 101     return user_commit, next_commit
 102
 103 def perform_pre_commit(sh):
 104     try:
 105         message = "Pre-commit of %s locker before autoinstall upgrade.\n\n%s" % (util.get_dir_owner(), util.get_git_footer())
 106         try:
 107             message += "\nPre-commit-by: " + util.get_operator_git()
 108         except util.NoOperatorInfo:
 109             pass
 110         sh.call("git", "commit", "-a", "-m", message)
 111     except shell.CallError:
 112         logging.info("No changes detected")
 113         pass
 114
 115 def perform_tmp_clone(sh):
 116     temp_dir = tempfile.mkdtemp(prefix="wizard")
 117     temp_wc_dir = os.path.join(temp_dir, "repo")
 118     logging.info("Using temporary directory: " + temp_wc_dir)
 119     sh.call("git", "clone", "--shared", ".", temp_wc_dir)
 120     return temp_wc_dir
 121
 122 def perform_merge(sh, repo, d, version):
 123     # naive merge algorithm:
 124     # sh.call("git", "merge", "-m", message, "scripts/master")
 125     # crazy merge algorithm:
 126     def make_virtual_commit(tag, parents = []):
 127         """WARNING: Changes state of Git repository"""
 128         sh.call("git", "checkout", tag, "--")
 129         d.parametrize(".")
 130         for file in d.application.parametrized_files:
 131             try:
 132                 sh.call("git", "add", "--", file)
 133             except shell.CallError:
 134                 pass
 135         virtual_tree = sh.eval("git", "write-tree")
 136         parent_args = itertools.chain(*(["-p", p] for p in parents))
 137         virtual_commit = sh.eval("git", "commit-tree", virtual_tree, *parent_args, input="")
 138         sh.call("git", "reset", "--hard")
 139         return virtual_commit
 140     user_tree = sh.eval("git", "rev-parse", "HEAD^{tree}")
 141     base_virtual_commit = make_virtual_commit(d.app_version.pristine_tag)
 142     next_virtual_commit = make_virtual_commit(version, [base_virtual_commit])
 143     user_virtual_commit = sh.eval("git", "commit-tree", user_tree, "-p", base_virtual_commit, input="")
 144     sh.call("git", "checkout", user_virtual_commit, "--")
 145     try:
 146         sh.call("git", "merge", next_virtual_commit)
 147     except shell.CallError:
 148         print os.getcwd()
 149         raise MergeFailed
 150
 151 def parse_args(argv, baton):
 152     usage = """usage: %prog upgrade [ARGS] [DIR]
 153
 154 Upgrades an autoinstall to the latest version.  This involves
 155 updating files and running .scripts/update.
 156
 157 WARNING: This is still experimental."""
 158     parser = command.WizardOptionParser(usage)
 159     parser.add_option("--dry-run", dest="dry_run", action="store_true",
 160             default=False, help="Prints would would be run without changing anything")
 161     # notice trailing underscore
 162     parser.add_option("--continue", dest="continue_", action="store_true",
 163             default=False, help="Continues an upgrade that has had its merge manually resolved using the current working directory as the resolved copy.")
 164     baton.push(parser, "srv_path")
 165     options, args = parser.parse_all(argv)
 166     if len(args) > 1:
 167         parser.error("too many arguments")
 168     return options, args
 169
 170 class Error(command.Error):
 171     """Base exception for all exceptions raised by upgrade"""
 172     pass
 173
 174 class NotAutoinstallError(Error):
 175     def __str__(self):
 176         return """
 177
 178 ERROR: Could not find .git file. Are you sure
 179 this is an autoinstalled application? Did you remember
 180 to migrate it?
 181 """
 182
 183 class MergeFailed(Error):
 184     def __str__(self):
 185         return """
 186
 187 ERROR: Merge failed.  Resolve the merge by cd'ing to the
 188 temporary directory, finding conflicted files with `git status`,
 189 resolving the files, adding them using `git add`, and then
 190 committing your changes with `git commit` (your log message
 191 will be ignored), and then running `wizard upgrade --continue`."""