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# Copyright (C) 2012 Anaconda, Inc
# SPDX-License-Identifier: BSD-3-Clause
"""Tools interfacing with conda's history file."""
from __future__ import annotations
import codecs
import logging
import os
import re
import sys
import time
import warnings
from ast import literal_eval
from errno import EACCES, EPERM, EROFS
from itertools import islice
from operator import itemgetter
from os.path import isdir, isfile, join
from textwrap import dedent
from . import __version__ as CONDA_VERSION
from .auxlib.ish import dals
from .base.constants import DEFAULTS_CHANNEL_NAME
from .base.context import context
from .common.compat import ensure_text_type, open_utf8
from .common.iterators import groupby_to_dict as groupby
from .common.path import paths_equal
from .core.prefix_data import PrefixData
from .exceptions import CondaHistoryError, NotWritableError
from .gateways.disk.update import touch
from .models.dist import dist_str_to_quad
from .models.match_spec import MatchSpec
from .models.version import VersionOrder, version_relation_re
log = logging.getLogger(__name__)
class CondaHistoryWarning(Warning):
pass
def write_head(fo):
fo.write("==> {} <==\n".format(time.strftime("%Y-%m-%d %H:%M:%S")))
fo.write("# cmd: {}\n".format(" ".join(ensure_text_type(s) for s in sys.argv)))
fo.write(
"# conda version: {}\n".format(".".join(islice(CONDA_VERSION.split("."), 3)))
)
def is_diff(content):
return any(s.startswith(("-", "+")) for s in content)
def pretty_diff(diff):
added = {}
removed = {}
for s in diff:
fn = s[1:]
name, version, _, channel = dist_str_to_quad(fn)
if channel != DEFAULTS_CHANNEL_NAME:
version += f" ({channel})"
if s.startswith("-"):
removed[name.lower()] = version
elif s.startswith("+"):
added[name.lower()] = version
changed = set(added) & set(removed)
for name in sorted(changed):
yield f" {name} {{{removed[name]} -> {added[name]}}}"
for name in sorted(set(removed) - changed):
yield f"-{name}-{removed[name]}"
for name in sorted(set(added) - changed):
yield f"+{name}-{added[name]}"
def pretty_content(content):
if is_diff(content):
return pretty_diff(content)
else:
return iter(sorted(content))
class History:
com_pat = re.compile(r"#\s*cmd:\s*(.+)")
spec_pat = re.compile(r"#\s*(\w+)\s*specs:\s*(.+)?")
conda_v_pat = re.compile(r"#\s*conda version:\s*(.+)")
def __init__(self, prefix):
self.prefix = prefix
self.meta_dir = join(prefix, "conda-meta")
self.path = join(self.meta_dir, "history")
def __enter__(self):
self.init_log_file()
return self
def __exit__(self, exc_type, exc_value, traceback):
self.update()
def init_log_file(self):
touch(self.path, True)
def file_is_empty(self):
return os.stat(self.path).st_size == 0
def update(self) -> None:
"""Update the history file (creating a new one if necessary)."""
try:
try:
last = set(self.get_state())
except CondaHistoryError as e:
warnings.warn(f"Error in {self.path}: {e}", CondaHistoryWarning)
return
pd = PrefixData(self.prefix)
curr = {prefix_rec.dist_str() for prefix_rec in pd.iter_records()}
self.write_changes(last, curr)
except OSError as e:
if e.errno in (EACCES, EPERM, EROFS):
raise NotWritableError(self.path, e.errno)
else:
raise
def parse(self) -> list[tuple[str, set[str], list[str]]]:
"""Parse the history file.
Return a list of tuples(datetime strings, set of distributions/diffs, comments).
Comments appearing before the first section header (e.g. ``==> 2024-01-01 00:00:00 <==``)
in the history file will be ignored.
"""
res = []
if not isfile(self.path):
return res
sep_pat = re.compile(r"==>\s*(.+?)\s*<==")
with open_utf8(self.path) as f:
lines = f.read().splitlines()
for line in lines:
line = line.strip()
if not line:
continue
m = sep_pat.match(line)
if m:
res.append((m.group(1), set(), []))
elif line.startswith("#") and res:
res[-1][2].append(line)
elif res:
res[-1][1].add(line)
return res
@staticmethod
def _parse_old_format_specs_string(specs_string):
"""
Parse specifications string that use conda<4.5 syntax.
Examples
--------
- "param >=1.5.1,<2.0'"
- "python>=3.5.1,jupyter >=1.0.0,<2.0,matplotlib >=1.5.1,<2.0"
"""
specs = []
for spec in specs_string.split(","):
# If the spec starts with a version qualifier, then it actually belongs to the
# previous spec. But don't try to join if there was no previous spec.
if version_relation_re.match(spec) and specs:
specs[-1] = ",".join([specs[-1], spec])
else:
specs.append(spec)
return specs
@classmethod
def _parse_comment_line(cls, line):
"""
Parse comment lines in the history file.
These lines can be of command type or action type.
Examples
--------
- "# cmd: /scratch/mc3/bin/conda install -c conda-forge param>=1.5.1,<2.0"
- "# install specs: python>=3.5.1,jupyter >=1.0.0,<2.0,matplotlib >=1.5.1,<2.0"
"""
item = {}
m = cls.com_pat.match(line)
if m:
argv = m.group(1).split()
if argv[0].endswith("conda"):
argv[0] = "conda"
item["cmd"] = argv
m = cls.conda_v_pat.match(line)
if m:
item["conda_version"] = m.group(1)
m = cls.spec_pat.match(line)
if m:
action, specs_string = m.groups()
specs_string = specs_string or ""
item["action"] = action
if specs_string.startswith("["):
specs = literal_eval(specs_string)
elif "[" not in specs_string:
specs = History._parse_old_format_specs_string(specs_string)
specs = [spec for spec in specs if spec and not spec.endswith("@")]
if specs and action in ("update", "install", "create"):
item["update_specs"] = item["specs"] = specs
elif specs and action in ("remove", "uninstall"):
item["remove_specs"] = item["specs"] = specs
elif specs and action in ("neutered",):
item["neutered_specs"] = item["specs"] = specs
return item
def get_user_requests(self):
"""Return a list of user requested items.
Each item is a dict with the following keys:
'date': the date and time running the command
'cmd': a list of argv of the actual command which was run
'action': install/remove/update
'specs': the specs being used
"""
res = []
for dt, unused_cont, comments in self.parse():
item = {"date": dt}
for line in comments:
comment_items = self._parse_comment_line(line)
item.update(comment_items)
if "cmd" in item:
res.append(item)
dists = groupby(itemgetter(0), unused_cont)
item["unlink_dists"] = dists.get("-", ())
item["link_dists"] = dists.get("+", ())
conda_versions_from_history = tuple(
x["conda_version"] for x in res if "conda_version" in x
)
if conda_versions_from_history and not context.allow_conda_downgrades:
minimum_conda_version = sorted(
conda_versions_from_history, key=VersionOrder
)[-1]
minimum_major_minor = ".".join(islice(minimum_conda_version.split("."), 2))
current_major_minor = ".".join(islice(CONDA_VERSION.split("."), 2))
if VersionOrder(current_major_minor) < VersionOrder(minimum_major_minor):
message = dals(
"""
This environment has previously been operated on by a conda version that's newer
than the conda currently being used. A newer version of conda is required.
target environment location: %(target_prefix)s
current conda version: %(conda_version)s
minimum conda version: %(minimum_version)s
"""
) % {
"target_prefix": self.prefix,
"conda_version": CONDA_VERSION,
"minimum_version": minimum_major_minor,
}
if not paths_equal(self.prefix, context.root_prefix):
message += dedent(
"""
Update conda and try again.
$ conda install -p "%(base_prefix)s" "conda>=%(minimum_version)s"
"""
) % {
"base_prefix": context.root_prefix,
"minimum_version": minimum_major_minor,
}
message += dedent(
"""
To work around this restriction, one can also set the config parameter
'allow_conda_downgrades' to False at their own risk.
"""
)
# TODO: we need to rethink this. It's fine as a warning to try to get users
# to avoid breaking their system. However, right now it is preventing
# normal conda operation after downgrading conda.
# raise CondaUpgradeError(message)
return res
def get_requested_specs_map(self):
# keys are package names and values are specs
spec_map = {}
for request in self.get_user_requests():
remove_specs = (MatchSpec(spec) for spec in request.get("remove_specs", ()))
for spec in remove_specs:
spec_map.pop(spec.name, None)
update_specs = (MatchSpec(spec) for spec in request.get("update_specs", ()))
spec_map.update((s.name, s) for s in update_specs)
# here is where the neutering takes effect, overriding past values
neutered_specs = (
MatchSpec(spec) for spec in request.get("neutered_specs", ())
)
spec_map.update((s.name, s) for s in neutered_specs)
# Conda hasn't always been good about recording when specs have been removed from
# environments. If the package isn't installed in the current environment, then we
# shouldn't try to force it here.
prefix_recs = {_.name for _ in PrefixData(self.prefix).iter_records()}
return {name: spec for name, spec in spec_map.items() if name in prefix_recs}
def construct_states(self):
"""Return a list of tuples(datetime strings, set of distributions)."""
res = []
cur = set()
for dt, cont, unused_com in self.parse():
if not is_diff(cont):
cur = cont
else:
for s in cont:
if s.startswith("-"):
cur.discard(s[1:])
elif s.startswith("+"):
cur.add(s[1:])
else:
raise CondaHistoryError(f"Did not expect: {s}")
res.append((dt, cur.copy()))
return res
def get_state(self, rev=-1):
"""Return the state, i.e. the set of distributions, for a given revision.
Defaults to latest (which is the same as the current state when
the log file is up-to-date).
Returns a list of dist_strs.
"""
states = self.construct_states()
if not states:
return set()
times, pkgs = zip(*states)
return pkgs[rev]
def print_log(self):
for i, (date, content, unused_com) in enumerate(self.parse()):
print("%s (rev %d)" % (date, i))
for line in pretty_content(content):
print(f" {line}")
print()
def object_log(self):
result = []
for i, (date, content, unused_com) in enumerate(self.parse()):
# Based on Mateusz's code; provides more details about the
# history event
event = {
"date": date,
"rev": i,
"install": [],
"remove": [],
"upgrade": [],
"downgrade": [],
}
added = {}
removed = {}
if is_diff(content):
for pkg in content:
name, version, build, channel = dist_str_to_quad(pkg[1:])
if pkg.startswith("+"):
added[name.lower()] = (version, build, channel)
elif pkg.startswith("-"):
removed[name.lower()] = (version, build, channel)
changed = set(added) & set(removed)
for name in sorted(changed):
old = removed[name]
new = added[name]
details = {
"old": "-".join((name,) + old),
"new": "-".join((name,) + new),
}
if new > old:
event["upgrade"].append(details)
else:
event["downgrade"].append(details)
for name in sorted(set(removed) - changed):
event["remove"].append("-".join((name,) + removed[name]))
for name in sorted(set(added) - changed):
event["install"].append("-".join((name,) + added[name]))
else:
for pkg in sorted(content):
event["install"].append(pkg)
result.append(event)
return result
def write_changes(self, last_state, current_state):
if not isdir(self.meta_dir):
os.makedirs(self.meta_dir)
with codecs.open(self.path, mode="ab", encoding="utf-8") as fo:
write_head(fo)
for fn in sorted(last_state - current_state):
fo.write(f"-{fn}\n")
for fn in sorted(current_state - last_state):
fo.write(f"+{fn}\n")
def write_specs(self, remove_specs=(), update_specs=(), neutered_specs=()):
remove_specs = [str(MatchSpec(s)) for s in remove_specs]
update_specs = [str(MatchSpec(s)) for s in update_specs]
neutered_specs = [str(MatchSpec(s)) for s in neutered_specs]
if any((update_specs, remove_specs, neutered_specs)):
with codecs.open(self.path, mode="ab", encoding="utf-8") as fh:
if remove_specs:
fh.write(f"# remove specs: {remove_specs}\n")
if update_specs:
fh.write(f"# update specs: {update_specs}\n")
if neutered_specs:
fh.write(f"# neutered specs: {neutered_specs}\n")
if __name__ == "__main__":
from pprint import pprint
# Don't use in context manager mode---it augments the history every time
h = History(sys.prefix)
pprint(h.get_user_requests())
print(h.get_requested_specs_map())