Mercurial > hg
view tests/test-convert-bzr-directories.t @ 25757:4d1382fd96ff
context: write dirstate out explicitly at the end of markcommitted
To detect change of a file without redundant comparison of file
content, dirstate recognizes a file as certainly clean, if:
(1) it is already known as "normal",
(2) dirstate entry for it has valid (= not "-1") timestamp, and
(3) mode, size and timestamp of it on the filesystem are as same as
ones expected in dirstate
This works as expected in many cases, but doesn't in the corner case
that changing a file keeps mode, size and timestamp of it on the
filesystem.
The timetable below shows steps in one of typical such situations:
---- ----------------------------------- ----------------
timestamp of "f"
----------------
dirstate file-
time action mem file system
---- ----------------------------------- ---- ----- -----
* *** ***
- 'hg transplant REV1 REV2 ...'
- transplanting REV1
....
N
- change "f", but keep size N
(via 'patch.patch()')
- 'dirstate.normal("f")' N ***
(via 'repo.commit()')
- transplanting REV2
- change "f", but keep size N
(via 'patch.patch()')
- aborted while patching
N+1
- release wlock
- 'dirstate.write()' N N N
- 'hg status' shows "r1" as "clean" N N N
---- ----------------------------------- ---- ----- -----
The most important point is that 'dirstate.write()' is executed at N+1
or later. This causes writing dirstate timestamp N of "f" out
successfully. If it is executed at N, 'parsers.pack_dirstate()'
replaces timestamp N with "-1" before actual writing dirstate out.
This issue can occur when 'hg transplant' satisfies conditions below:
- multiple revisions to be transplanted change the same file
- those revisions don't change mode and size of the file, and
- the 2nd or later revision of them fails after changing the file
The root cause of this issue is that files are changed without
flushing in-memory dirstate changes via 'repo.commit()' (even though
omitting 'dirstate.normallookup()' on files changed by 'patch.patch()'
for efficiency also causes this issue).
To detect changes of files correctly, this patch writes in-memory
dirstate changes out explicitly after marking files as clean in
'committablectx.markcommitted()', which is invoked via
'repo.commit()'.
After this change, timetable is changed as below:
---- ----------------------------------- ----------------
timestamp of "f"
----------------
dirstate file-
time action mem file system
---- ----------------------------------- ---- ----- -----
* *** ***
- 'hg transplant REV1 REV2 ...'
- transplanting REV1
....
N
- change "f", but keep size N
(via 'patch.patch()')
- 'dirstate.normal("f")' N ***
(via 'repo.commit()')
----------------------------------- ---- ----- -----
- 'dirsttate.write()' -1 -1
----------------------------------- ---- ----- -----
- transplanting REV2
- change "f", but keep size N
(via 'patch.patch()')
- aborted while patching
N+1
- release wlock
- 'dirstate.write()' -1 -1 N
- 'hg status' shows "r1" as "clean" -1 -1 N
---- ----------------------------------- ---- ----- -----
To reproduce this issue in tests certainly, this patch emulates some
timing critical actions as below:
- change "f" at N
'patch.patch()' with 'fakepatchtime.py' explicitly changes mtime
of patched files to "2000-01-01 00:00" (= N).
- 'dirstate.write()' via 'repo.commit()' at N
'fakedirstatewritetime.py' forces 'pack_dirstate()' to use
"2000-01-01 00:00" as "now", only if 'pack_dirstate()' is invoked
via 'committablectx.markcommitted()'.
- 'dirstate.write()' via releasing wlock at N+1 (or "not at N")
'pack_dirstate()' via releasing wlock uses actual timestamp at
runtime as "now", and it should be different from the "2000-01-01
00:00" of "f".
BTW, this patch doesn't test cases below, even though 'patch.patch()'
is used similarly in these cases:
1. failure of 'hg import' or 'hg qpush'
2. success of 'hg import', 'hg qpush' or 'hg transplant'
Case (1) above doesn't cause this kind of issue, because:
- if patching is aborted by conflicts, changed files are committed
changed files are marked as CLEAN, even though they are partially
patched.
- otherwise, dirstate are fully restored by 'dirstateguard'
For example in timetable above, timestamp of "f" in .hg/dirstate
is restored to -1 (or less than N), and subsequent 'hg status' can
detect changes correctly.
Case (2) always causes 'repo.status()' invocation via 'repo.commit()'
just after changing files inside same wlock scope.
---- ----------------------------------- ----------------
timestamp of "f"
----------------
dirstate file-
time action mem file system
---- ----------------------------------- ---- ----- -----
N *** ***
- make file "f" clean N
- execute 'hg foobar'
....
- 'dirstate.normal("f")' N ***
(e.g. via dirty check
or previous 'repo.commit()')
- change "f", but keep size N
- 'repo.status()' (*1)
(via 'repo.commit()')
---- ----------------------------------- ---- ----- -----
At a glance, 'repo.status()' at (*1) seems to cause similar issue (=
"changed files are treated as clean"), but actually doesn't.
'dirstate._lastnormaltime' should be N at (*1) above, because
'dirstate.normal()' via dirty check is finished at N.
Therefore, "f" changed at N (= 'dirstate._lastnormaltime') is forcibly
treated as "unsure" at (*1), and changes are detected as expected (see
'dirstate.status()' for detail).
If 'hg import' is executed with '--no-commit', 'repo.status()' isn't
invoked just after changing files inside same wlock scope.
But preceding 'dirstate.normal()' is invoked inside another wlock
scope via 'cmdutil.bailifchanged()', and in-memory changes should be
flushed at the end of that scope.
Therefore, timestamp N of clean "f" should be replaced by -1, if
'dirstate.write()' is invoked at N. It means that condition of this
issue isn't satisfied.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
---|---|
date | Wed, 08 Jul 2015 17:01:09 +0900 |
parents | 3c72117a7a0e |
children | 89872688893f |
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$ . "$TESTDIR/bzr-definitions" empty directory $ mkdir test-empty $ cd test-empty $ bzr init -q source $ cd source $ echo content > a $ bzr add -q a $ bzr commit -q -m 'Initial add' $ mkdir empty $ bzr add -q empty $ bzr commit -q -m 'Empty directory added' $ echo content > empty/something $ bzr add -q empty/something $ bzr commit -q -m 'Added file into directory' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 2 Initial add 1 Empty directory added 0 Added file into directory $ manifest source-hg 1 % manifest of 1 644 a $ manifest source-hg tip % manifest of tip 644 a 644 empty/something $ cd .. directory renames $ mkdir test-dir-rename $ cd test-dir-rename $ bzr init -q source $ cd source $ mkdir tpyo $ echo content > tpyo/something $ bzr add -q tpyo $ bzr commit -q -m 'Added directory' $ bzr mv tpyo typo tpyo => typo $ bzr commit -q -m 'Oops, typo' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 1 Added directory 0 Oops, typo $ manifest source-hg 0 % manifest of 0 644 tpyo/something $ manifest source-hg tip % manifest of tip 644 typo/something $ cd .. nested directory renames $ mkdir test-nested-dir-rename $ cd test-nested-dir-rename $ bzr init -q source $ cd source $ mkdir -p firstlevel/secondlevel/thirdlevel $ echo content > firstlevel/secondlevel/file $ echo this_needs_to_be_there_too > firstlevel/secondlevel/thirdlevel/stuff $ bzr add -q firstlevel $ bzr commit -q -m 'Added nested directories' $ bzr mv firstlevel/secondlevel secondlevel firstlevel/secondlevel => secondlevel $ bzr commit -q -m 'Moved secondlevel one level up' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 1 Added nested directories 0 Moved secondlevel one level up $ manifest source-hg tip % manifest of tip 644 secondlevel/file 644 secondlevel/thirdlevel/stuff $ cd .. directory remove $ mkdir test-dir-remove $ cd test-dir-remove $ bzr init -q source $ cd source $ mkdir src $ echo content > src/sourcecode $ bzr add -q src $ bzr commit -q -m 'Added directory' $ bzr rm -q src $ bzr commit -q -m 'Removed directory' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 1 Added directory 0 Removed directory $ manifest source-hg 0 % manifest of 0 644 src/sourcecode $ manifest source-hg tip % manifest of tip $ cd .. directory replace $ mkdir test-dir-replace $ cd test-dir-replace $ bzr init -q source $ cd source $ mkdir first second $ echo content > first/file $ echo morecontent > first/dummy $ echo othercontent > second/something $ bzr add -q first second $ bzr commit -q -m 'Initial layout' $ bzr mv first/file second/file first/file => second/file $ bzr mv first third first => third $ bzr commit -q -m 'Some conflicting moves' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 1 Initial layout 0 Some conflicting moves $ manifest source-hg tip % manifest of tip 644 second/file 644 second/something 644 third/dummy $ cd .. divergent nested renames (issue3089) $ mkdir test-divergent-renames $ cd test-divergent-renames $ bzr init -q source $ cd source $ mkdir -p a/c $ echo a > a/fa $ echo c > a/c/fc $ bzr add -q a $ bzr commit -q -m 'Initial layout' $ bzr mv a b a => b $ mkdir a $ bzr add a add(ed|ing) a (re) $ bzr mv b/c a/c b/c => a/c $ bzr status added: a/ renamed: a/? => b/? (re) a/c/? => a/c/? (re) $ bzr commit -q -m 'Divergent renames' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 1 Initial layout 0 Divergent renames $ hg -R source-hg st -C --change 1 A b/fa a/fa R a/fa $ hg -R source-hg manifest -r 1 a/c/fc b/fa $ cd ..