wizard/command/upgrade.py

   1 import optparse
   2 import sys
   3 import distutils.version
   4 import os
   5 import shutil
   6 import logging.handlers
   7 import errno
   8 import tempfile
   9 import itertools
  10
  11 from wizard import command, deploy, shell, util
  12
  13 def main(argv, baton):
  14     options, args = parse_args(argv, baton)
  15     if args:
  16         dir = args[0]
  17     else:
  18         dir = "."
  19     shell.drop_priviledges(dir, options.log_file)
  20     util.chdir(dir)
  21     sh = shell.Shell()
  22     util.set_git_env()
  23     if options.continue_:
  24         temp_wc_dir = os.getcwd()
  25         user_commit, next_commit = open(".git/WIZARD_PARENTS", "r").read().split()
  26         repo = open(".git/WIZARD_REPO", "r").read()
  27         version = open(".git/WIZARD_UPGRADE_VERSION", "r").read()
  28         util.chdir(sh.eval("git", "config", "remote.origin.url"))
  29         d = deploy.Deployment(".")
  30         try:
  31             sh.call("git", "status")
  32             raise LocalChangesError()
  33         except shell.CallError:
  34             pass
  35     else:
  36         d = deploy.Deployment(".")
  37         d.verify()
  38         d.verifyTag(options.srv_path)
  39         d.verifyGit(options.srv_path)
  40         d.verifyConfigured()
  41         d.verifyVersion()
  42         repo = d.application.repository(options.srv_path)
  43         version = calculate_newest_version(sh, repo)
  44         if version == d.app_version.scripts_tag and not options.force:
  45             raise AlreadyUpgraded
  46         if not options.dry_run:
  47             perform_pre_commit(sh)
  48         temp_wc_dir = perform_tmp_clone(sh)
  49         with util.ChangeDirectory(temp_wc_dir):
  50             sh.call("git", "remote", "add", "scripts", repo)
  51             sh.call("git", "fetch", "scripts")
  52             user_commit, next_commit = calculate_parents(sh, version)
  53             # save variables so that --continue will work
  54             # yeah yeah no trailing newline whatever
  55             open(".git/WIZARD_REPO", "w").write(repo)
  56             open(".git/WIZARD_UPGRADE_VERSION", "w").write(version)
  57             open(".git/WIZARD_PARENTS", "w").write("%s\n%s" % (user_commit, next_commit))
  58             perform_merge(sh, repo, d, version)
  59     # variables: version, user_commit, next_commit, temp_wc_dir
  60     with util.ChangeDirectory(temp_wc_dir):
  61         message = make_commit_message(version)
  62         new_tree = sh.eval("git", "rev-parse", "HEAD^{tree}")
  63         final_commit = sh.eval("git", "commit-tree", new_tree,
  64                 "-p", user_commit, "-p", next_commit, input=message, log=True)
  65         # a master branch may not necessarily exist if the user
  66         # was manually installed to an earlier version
  67         try:
  68             sh.call("git", "checkout", "-b", "master", "--")
  69         except shell.CallError:
  70             sh.call("git", "checkout", "master", "--")
  71         sh.call("git", "reset", "--hard", final_commit)
  72     # Till now, all of our operations were in a tmp sandbox.
  73     if options.dry_run:
  74         logging.info("Dry run, bailing.  See results at %s" % temp_wc_dir)
  75         return
  76     # XXX: frob .htaccess to make site inaccessible
  77     # XXX: need locking
  78     # git merge (which performs a fast forward)
  79     #   - merge could fail (race); that's /really/ dangerous.
  80     sh.call("git", "pull", temp_wc_dir, "master")
  81     # run update script
  82     version_obj = distutils.version.LooseVersion(version.partition('-')[2])
  83     d.application.upgrade(version_obj, options)
  84     # XXX: frob .htaccess to make site accessible
  85     # XXX:  - check if .htaccess changed, first.  Upgrade
  86     #       process might have frobbed it.  Don't be
  87     #       particularly worried if the segment dissappeared
  88
  89 def make_commit_message(version):
  90     message = "Upgraded autoinstall in %s to %s.\n\n%s" % (util.get_dir_owner(), version, util.get_git_footer())
  91     try:
  92         message += "\nUpgraded-by: " + util.get_operator_git()
  93     except util.NoOperatorInfo:
  94         pass
  95     return message
  96
  97 def calculate_newest_version(sh, repo):
  98     # XXX: put this in Application
  99     return sh.eval("git", "--git-dir="+repo, "describe", "--tags", "master")
 100
 101 def calculate_parents(sh, version):
 102     user_commit = sh.eval("git", "rev-parse", "HEAD")
 103     next_commit = sh.eval("git", "rev-parse", version)
 104     return user_commit, next_commit
 105
 106 def perform_pre_commit(sh):
 107     message = "Pre-commit of %s locker before autoinstall upgrade.\n\n%s" % (util.get_dir_owner(), util.get_git_footer())
 108     try:
 109         message += "\nPre-commit-by: " + util.get_operator_git()
 110     except util.NoOperatorInfo:
 111         pass
 112     try:
 113         sh.call("git", "commit", "-a", "-m", message)
 114     except shell.CallError:
 115         logging.info("No changes detected")
 116
 117 def perform_tmp_clone(sh):
 118     temp_dir = tempfile.mkdtemp(prefix="wizard")
 119     temp_wc_dir = os.path.join(temp_dir, "repo")
 120     logging.info("Using temporary directory: " + temp_wc_dir)
 121     sh.call("git", "clone", "--shared", ".", temp_wc_dir)
 122     return temp_wc_dir
 123
 124 def perform_merge(sh, repo, d, version):
 125     # naive merge algorithm:
 126     # sh.call("git", "merge", "-m", message, "scripts/master")
 127     # crazy merge algorithm:
 128     def make_virtual_commit(tag, parents = []):
 129         """WARNING: Changes state of Git repository"""
 130         sh.call("git", "checkout", tag, "--")
 131         d.parametrize(".")
 132         for file in d.application.parametrized_files:
 133             try:
 134                 sh.call("git", "add", "--", file)
 135             except shell.CallError:
 136                 pass
 137         virtual_tree = sh.eval("git", "write-tree", log=True)
 138         parent_args = itertools.chain(*(["-p", p] for p in parents))
 139         virtual_commit = sh.eval("git", "commit-tree", virtual_tree,
 140                 *parent_args, input="", log=True)
 141         sh.call("git", "reset", "--hard")
 142         return virtual_commit
 143     user_tree = sh.eval("git", "rev-parse", "HEAD^{tree}")
 144     base_virtual_commit = make_virtual_commit(d.app_version.scripts_tag)
 145     next_virtual_commit = make_virtual_commit(version, [base_virtual_commit])
 146     user_virtual_commit = sh.eval("git", "commit-tree", user_tree,
 147             "-p", base_virtual_commit, input="", log=True)
 148     sh.call("git", "checkout", user_virtual_commit, "--")
 149     try:
 150         sh.call("git", "merge", next_virtual_commit)
 151     except shell.CallError:
 152         print os.getcwd()
 153         logging.info("Conflict info:\n", sh.eval("git", "diff"))
 154         raise MergeFailed
 155
 156 def parse_args(argv, baton):
 157     usage = """usage: %prog upgrade [ARGS] [DIR]
 158
 159 Upgrades an autoinstall to the latest version.  This involves
 160 updating files and running .scripts/update.
 161
 162 WARNING: This is still experimental."""
 163     parser = command.WizardOptionParser(usage)
 164     parser.add_option("--dry-run", dest="dry_run", action="store_true",
 165             default=False, help="Prints would would be run without changing anything")
 166     # notice trailing underscore
 167     parser.add_option("--continue", dest="continue_", action="store_true",
 168             default=False, help="Continues an upgrade that has had its merge manually "
 169             "resolved using the current working directory as the resolved copy.")
 170     parser.add_option("--force", dest="force", action="store_true",
 171             default=False, help="Force running upgrade even if it's already at latest version.")
 172     baton.push(parser, "srv_path")
 173     options, args = parser.parse_all(argv)
 174     if len(args) > 1:
 175         parser.error("too many arguments")
 176     return options, args
 177
 178 class Error(command.Error):
 179     """Base exception for all exceptions raised by upgrade"""
 180     pass
 181
 182 class AlreadyUpgraded(Error):
 183     def __str__(self):
 184         return """
 185
 186 ERROR: This autoinstall is already at the latest version."""
 187
 188 class MergeFailed(Error):
 189     def __str__(self):
 190         return """
 191
 192 ERROR: Merge failed.  Resolve the merge by cd'ing to the
 193 temporary directory, finding conflicted files with `git status`,
 194 resolving the files, adding them using `git add`, and then
 195 committing your changes with `git commit` (your log message
 196 will be ignored), and then running `wizard upgrade --continue`."""
 197
 198 class LocalChangesError(Error):
 199     def __str__(self):
 200         return """
 201
 202 ERROR: Local changes occurred in the install while the merge was
 203 being processed so that a pull would not result in a fast-forward.
 204 The best way to resolve this is probably to attempt an upgrade again,
 205 with git rerere to remember merge resolutions (XXX: not sure if
 206 this actually works)."""
 207