import-checker: establish modern import convention
We introduce a new convention for declaring imports and enforce it via
the import checker script.
The new convention is only active when absolute imports are used, which is
currently nowhere. Keying off "from __future__ import absolute_import" to
engage the new import convention seems like the easiest solution. It is
also beneficial for Mercurial to use this mode because it means less work
and ambiguity for the importer and potentially better performance due to
fewer stat() system calls because the importer won't look for modules in
relative paths unless explicitly asked.
Once all files are converted to use absolute import, we can refactor
this code to again only have a single import convention and we can
require use of absolute import in the style checker.
The rules for the new convention are documented in the docstring of the
added function. Tests have been added to test-module-imports.t. Some
tests are sensitive to newlines and source column position, which makes
docstring testing difficult and/or impossible.
# Construct the following history tree:
#
# @ 5:e1bb631146ca b1
# |
# o 4:a4fdb3b883c4 0:b608b9236435 b1
# |
# | o 3:4b57d2520816 1:44592833ba9f
# | |
# | | o 2:063f31070f65
# | |/
# | o 1:44592833ba9f
# |/
# o 0:b608b9236435
$ mkdir b1
$ cd b1
$ hg init
$ echo foo > foo
$ echo zero > a
$ hg init sub
$ echo suba > sub/suba
$ hg --cwd sub ci -Am addsuba
adding suba
$ echo 'sub = sub' > .hgsub
$ hg ci -qAm0
$ echo one > a ; hg ci -m1
$ echo two > a ; hg ci -m2
$ hg up -q 1
$ echo three > a ; hg ci -qm3
$ hg up -q 0
$ hg branch -q b1
$ echo four > a ; hg ci -qm4
$ echo five > a ; hg ci -qm5
Initial repo state:
$ hg log -G --template '{rev}:{node|short} {parents} {branches}\n'
@ 5:ff252e8273df b1
|
o 4:d047485b3896 0:60829823a42a b1
|
| o 3:6efa171f091b 1:0786582aa4b1
| |
| | o 2:bd10386d478c
| |/
| o 1:0786582aa4b1
|/
o 0:60829823a42a
Make sure update doesn't assume b1 is a repository if invoked from outside:
$ cd ..
$ hg update b1
abort: no repository found in '$TESTTMP' (.hg not found)!
[255]
$ cd b1
Test helper functions:
$ revtest () {
> msg=$1
> dirtyflag=$2 # 'clean', 'dirty' or 'dirtysub'
> startrev=$3
> targetrev=$4
> opt=$5
> hg up -qC $startrev
> test $dirtyflag = dirty && echo dirty > foo
> test $dirtyflag = dirtysub && echo dirty > sub/suba
> hg up $opt $targetrev
> hg parent --template 'parent={rev}\n'
> hg stat -S
> }
$ norevtest () {
> msg=$1
> dirtyflag=$2 # 'clean', 'dirty' or 'dirtysub'
> startrev=$3
> opt=$4
> hg up -qC $startrev
> test $dirtyflag = dirty && echo dirty > foo
> test $dirtyflag = dirtysub && echo dirty > sub/suba
> hg up $opt
> hg parent --template 'parent={rev}\n'
> hg stat -S
> }
Test cases are documented in a table in the update function of merge.py.
Cases are run as shown in that table, row by row.
$ norevtest 'none clean linear' clean 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=5
$ norevtest 'none clean same' clean 2
abort: not a linear update
(merge or update --check to force update)
parent=2
$ revtest 'none clean linear' clean 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
$ revtest 'none clean same' clean 2 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=3
$ revtest 'none clean cross' clean 3 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=4
$ revtest 'none dirty linear' dirty 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
M foo
$ revtest 'none dirtysub linear' dirtysub 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
M sub/suba
$ revtest 'none dirty same' dirty 2 3
abort: uncommitted changes
(commit or update --clean to discard changes)
parent=2
M foo
$ revtest 'none dirtysub same' dirtysub 2 3
abort: uncommitted changes
(commit or update --clean to discard changes)
parent=2
M sub/suba
$ revtest 'none dirty cross' dirty 3 4
abort: uncommitted changes
(commit or update --clean to discard changes)
parent=3
M foo
$ norevtest 'none dirty cross' dirty 2
abort: uncommitted changes
(commit and merge, or update --clean to discard changes)
parent=2
M foo
$ revtest 'none dirtysub cross' dirtysub 3 4
abort: uncommitted changes
(commit or update --clean to discard changes)
parent=3
M sub/suba
$ revtest '-C dirty linear' dirty 1 2 -C
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
$ revtest '-c dirty linear' dirty 1 2 -c
abort: uncommitted changes
parent=1
M foo
$ revtest '-c dirtysub linear' dirtysub 1 2 -c
abort: uncommitted changes in subrepository 'sub'
parent=1
M sub/suba
$ norevtest '-c clean same' clean 2 -c
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=3
$ revtest '-cC dirty linear' dirty 1 2 -cC
abort: cannot specify both -c/--check and -C/--clean
parent=1
M foo
Test obsolescence behavior
---------------------------------------------------------------------
successors should be taken in account when checking head destination
$ cat << EOF >> $HGRCPATH
> [ui]
> logtemplate={rev}:{node|short} {desc|firstline}
> [experimental]
> evolution=createmarkers
> EOF
Test no-argument update to a successor of an obsoleted changeset
$ hg log -G
o 5:ff252e8273df 5
|
o 4:d047485b3896 4
|
| o 3:6efa171f091b 3
| |
| | o 2:bd10386d478c 2
| |/
| @ 1:0786582aa4b1 1
|/
o 0:60829823a42a 0
$ hg book bm -r 3
$ hg status
M foo
We add simple obsolescence marker between 3 and 4 (indirect successors)
$ hg id --debug -i -r 3
6efa171f091b00a3c35edc15d48c52a498929953
$ hg id --debug -i -r 4
d047485b3896813b2a624e86201983520f003206
$ hg debugobsolete 6efa171f091b00a3c35edc15d48c52a498929953 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
$ hg debugobsolete aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa d047485b3896813b2a624e86201983520f003206
Test that 5 is detected as a valid destination from 3 and also accepts moving
the bookmark (issue4015)
$ hg up --quiet --hidden 3
$ hg up 5
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg book bm
moving bookmark 'bm' forward from 6efa171f091b
$ hg bookmarks
* bm 5:ff252e8273df
Test that 4 is detected as the no-argument destination from 3 and also moves
the bookmark with it
$ hg up --quiet 0 # we should be able to update to 3 directly
$ hg up --quiet --hidden 3 # but not implemented yet.
$ hg book -f bm
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updating bookmark bm
$ hg book
* bm 4:d047485b3896
Test that 5 is detected as a valid destination from 1
$ hg up --quiet 0 # we should be able to update to 3 directly
$ hg up --quiet --hidden 3 # but not implemented yet.
$ hg up 5
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
Test that 5 is not detected as a valid destination from 2
$ hg up --quiet 0
$ hg up --quiet 2
$ hg up 5
abort: uncommitted changes
(commit or update --clean to discard changes)
[255]
Test that we don't crash when updating from a pruned changeset (i.e. has no
successors). Behavior should probably be that we update to the first
non-obsolete parent but that will be decided later.
$ hg id --debug -r 2
bd10386d478cd5a9faf2e604114c8e6da62d3889
$ hg up --quiet 0
$ hg up --quiet 2
$ hg debugobsolete bd10386d478cd5a9faf2e604114c8e6da62d3889
$ hg up
0 files updated, 0 files merged, 0 files removed, 0 files unresolved