Mercurial > hg
annotate mercurial/txnutil.py @ 47387:75e1104f23a2
revlog: use dedicated code for reading sidedata
We are about to introduce a new, dedicated, file to store sidedata. Before doing so, we make sidedata reading go through different code as reading data chunk. This will simplify some of the complexity of the next changesets.
The reading is very simple right now and will need some improvement later to
reuse some of the caching strategy we use for the data file.
Differential Revision: https://phab.mercurial-scm.org/D10785
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Thu, 27 May 2021 04:09:30 +0200 |
parents | 89a2afe31e82 |
children | 6000f5b25c9b |
rev | line source |
---|---|
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
1 # txnutil.py - transaction related utilities |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
2 # |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
3 # Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
4 # |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
5 # This software may be used and distributed according to the terms of the |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
6 # GNU General Public License version 2 or any later version. |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
7 |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
8 from __future__ import absolute_import |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
9 |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
10 import errno |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
11 |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
31050
diff
changeset
|
12 from . import encoding |
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
31050
diff
changeset
|
13 |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
14 |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
15 def mayhavepending(root): |
45942
89a2afe31e82
formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents:
43077
diff
changeset
|
16 """return whether 'root' may have pending changes, which are |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
17 visible to this process. |
45942
89a2afe31e82
formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents:
43077
diff
changeset
|
18 """ |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
19 return root == encoding.environ.get(b'HG_PENDING') |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
20 |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
31050
diff
changeset
|
21 |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
22 def trypending(root, vfs, filename, **kwargs): |
45942
89a2afe31e82
formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents:
43077
diff
changeset
|
23 """Open file to be read according to HG_PENDING environment variable |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
24 |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
25 This opens '.pending' of specified 'filename' only when HG_PENDING |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
26 is equal to 'root'. |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
27 |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
28 This returns '(fp, is_pending_opened)' tuple. |
45942
89a2afe31e82
formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents:
43077
diff
changeset
|
29 """ |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
30 if mayhavepending(root): |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
31 try: |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
32 return (vfs(b'%s.pending' % filename, **kwargs), True) |
31050
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
33 except IOError as inst: |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
34 if inst.errno != errno.ENOENT: |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
35 raise |
206532700213
txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
diff
changeset
|
36 return (vfs(filename, **kwargs), False) |