95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
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import os
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import re
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import sys
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def main(opts, args):
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"""Usage: python rollback.py date
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Parse /var/log/pacman.log, enumerating package transactions since the
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specified date and building a plan for restoring the state of your system to
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what it was at the specified date.
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Assumes:
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- /var/log/pacman.log has not been truncated
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- /var/cache/pacman/pkg has not been flushed and still contains all required
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packages
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- The above paths are Arch default and have not been customized
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- That it is not necessary to remove any "installed" packages
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Note: no attempt is made to inspect the dependency graph of packages to be
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downgraded to detect when a package is already transitively listed for
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downgrading. This can create some annoying errors where eg. systemd will be
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downgraded, meaning libsystemd will also be downgraded, but pacman considers
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explicitly listing the downgrade of libsystemd when it will already be
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transitively downgraded an error.
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"""
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date, = args
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print("Attempting to roll back package state to that of {0}...\n"
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.format(date),
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file=sys.stderr)
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# These patterns can't be collapsed because we want to select different
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# version identifying strings depending on which case we're in. Not ideal,
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# but it works.
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# Ex. [2017-04-01 09:51] [ALPM] upgraded filesystem (2016.12-2 -> 2017.03-2)
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upgraded_pattern = re.compile(
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".*? upgraded (?P<name>\w+) \((?P<from>[^ ]+) -> (?P<to>[^\)]+)\)")
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# Ex: [2018-02-23 21:18] [ALPM] downgraded emacs (25.3-3 -> 25.3-2)
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downgraded_pattern = re.compile(
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".*? downgraded (?P<name>\w+) \((?P<to>[^ ]+) -> (?P<from>[^\)]+)\)")
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# Ex: [2017-03-31 07:05] [ALPM] removed gdm (3.22.3-1)
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removed_pattern = re.compile(
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".*? removed (?P<name>\w+) \((?P<from>[^ ]+)\)")
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checkpoint = {}
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flag = False
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with open("/var/log/pacman.log") as logfile:
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for line in logfile:
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if date in line:
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flag = True
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elif not flag:
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continue
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match = re.match(upgraded_pattern, line)\
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or re.match(downgraded_pattern, line)\
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or re.match(removed_pattern, line)
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if match:
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package = match.group("name")
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from_rev = match.group("from")
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if package not in checkpoint:
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checkpoint[package] = from_rev
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continue
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print("Checkpoint state:")
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for k in checkpoint.keys():
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print("{0} -> {1}".format(k, checkpoint[k]), file=sys.stderr)
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pkgcache = "/var/cache/pacman/pkg"
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pkgs = os.listdir(pkgcache)
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pkgnames = ["{0}-{1}".format(k, v) for k, v in checkpoint.items()]
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selected_pkgs = set([os.path.join(pkgcache, p)
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for n in pkgnames
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for p in pkgs
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if n in p])
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print("Suggested incantation:\n", file=sys.stderr)
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print("sudo pacman --noconfirm -U {}"
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.format("\\\n ".join(selected_pkgs)))
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if __name__ == "__main__":
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main(None, sys.argv[1:])
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