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