This works around the `/usr/bin/pg_dump` failure described in the
previous commit. Since we are now calling the appropriately-versioned
`pg_dump` binary directly, it is no longer "necessary", but is added
as a defense-in-depth.
`/usr/bin/pg_dump` on Ubuntu and Debian is actually a tool which
attempts to choose which `pg_dump` binary from all of the
`postgresql-client-*` packages that are installed to run. However,
its logic is confused by passing empty `--host` and `--port` options
-- instead of looking at the running server instance on the server, it
instead assumes some remote host and chooses the highest versioned
`pg_dump` which is installed.
Because Zulip writes binary database backups, they are sensitive to
the version of the client `pg_dump` binary is used -- and the output
may not be backwards compatible. Using a PostgreSQL 16 `pg_dump`
writes archive format 1.15, which cannot be read by a PostgreSQL 15
`pg_restore`.
Zulip does not currently support PostgreSQL 16 as a server. This
means that backups on servers with `postgresql-client-16` installed
did not successfully round-trip Zulip backups -- their backups are
written using PostgreSQL 16's client, and the `pg_restore` chosen on
restore was correctly chosen as the one whose version matched the
server (PostgreSQL 15 or below), and thus did not understand the new
archive format.
Existing `./manage.py backups` taken since `postgresql-client-16` were
installed are thus not directly usable by the `restore-backup` script.
They are not useless, however, since they can theoretically be
converted into a format readable by PostgreSQL 15 -- by importing into
a PostgreSQL 16 instance, and re-dumping with a PostgreSQL 15
`pg_dump`.
Fix this issue by hard-coding path to the binary whose version matches
the version of the server we are connected to. This may theoretically
fail if we are connected to a remote PostgreSQL instance and we do not
have a `postgresql-client` package locally installed which matches the
remote PostgreSQL server's version. However, choosing a matching
version is the only way to ensure that it will be able to be imported
cleanly -- and it is preferable that we fail the backup process rather
than write backups that we cannot easily restore from.
Fixes: #27160.
This change is solely for removing the attribute error that mypy raises when we
access `pg_version` on `connection`. django-stubs annotate `connection` as
`BaseDatabaseWrapper` while it is actually a proxy object, so we cannot
use an regular assertion with isinstance to narrow the type.
Signed-off-by: Zixuan James Li <p359101898@gmail.com>
Automatically generated by the following script, based on the output
of lint with flake8-comma:
import re
import sys
last_filename = None
last_row = None
lines = []
for msg in sys.stdin:
m = re.match(
r"\x1b\[35mflake8 \|\x1b\[0m \x1b\[1;31m(.+):(\d+):(\d+): (\w+)", msg
)
if m:
filename, row_str, col_str, err = m.groups()
row, col = int(row_str), int(col_str)
if filename == last_filename:
assert last_row != row
else:
if last_filename is not None:
with open(last_filename, "w") as f:
f.writelines(lines)
with open(filename) as f:
lines = f.readlines()
last_filename = filename
last_row = row
line = lines[row - 1]
if err in ["C812", "C815"]:
lines[row - 1] = line[: col - 1] + "," + line[col - 1 :]
elif err in ["C819"]:
assert line[col - 2] == ","
lines[row - 1] = line[: col - 2] + line[col - 1 :].lstrip(" ")
if last_filename is not None:
with open(last_filename, "w") as f:
f.writelines(lines)
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
This is a preparatory commit for using isort for sorting all of our
imports, merging changes to files where we can easily review the
changes as something we're happy with.
These are also files with relatively little active development, which
means we don't expect much merge conflict risk from these changes.
This avoids a spurious permission error inside the Postgres
`resolve_symlinks` function if we don’t have access to the current
working directory (e.g. we’re running with cwd /root inside `su
zulip`).
While we’re here, add a defensive `--` argument.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Anders Kaseorg
Alex Vandiver
Zixuan James Li
PIG208
Anders Kaseorg
Vishnu KS
Tim Abbott
rht
Shubham Padia
Anders Kaseorg