demandimport: delay loading for "from a import b" with absolute_import
Before this patch, "from a import b" doesn't delay loading module "b",
if absolute_import is enabled, even though "from . import b" does.
For example:
- it is assumed that extension X has "from P import M" for module M
under package P with absolute_import feature
- if importing module M is already delayed before loading extension
X, loading module M in extension X is delayed until actually
referring
util, cmdutil, scmutil or so of Mercurial itself should be
imported by "from . import M" style before loading extension X
- otherwise, module M is loaded immediately at loading extension X,
even if extension X itself isn't used at that "hg" command invocation
Some minor modules (e.g. filemerge or so) of Mercurial itself
aren't imported by "from . import M" style before loading
extension X. And of course, external libraries aren't, too.
This might cause startup performance problem of hg command, because
many bundled extensions already enable absolute_import feature.
To delay loading module for "from a import b" with absolute_import
feature, this patch does below in "from a (or .a) import b" with
absolute_import case:
1. import root module of "name" by system built-in __import__
(referred as _origimport)
2. recurse down the module chain for hierarchical "name"
This logic can be shared with non absolute_import
case. Therefore, this patch also centralizes it into chainmodules().
3. and fall through to process elements in "fromlist" for the leaf
module of "name"
Processing elements in "fromlist" is executed in the code path
after "if _pypy: .... else: ..." clause. Therefore, this patch
replaces "if _pypy:" with "elif _pypy:" to share it.
At 4f1144c3c72b introducing original "work around" for "from a import
b" case, elements in "fromlist" were imported with "level=level". But
"level" might be grater than 1 (e.g. level=2 in "from .. import b"
case) at demandimport() invocation, and importing direct sub-module in
"fromlist" with level grater than 1 causes unexpected result.
IMHO, this seems main reason of "errors for unknown reason" described
in 4f1144c3c72b, and we don't have to worry about it, because this
issue was already fixed by 78d05778907b.
This is reason why this patch removes "errors for unknown reasons"
comment.
#require serve
$ echo "[extensions]" >> $HGRCPATH
$ echo "fetch=" >> $HGRCPATH
test fetch with default branches only
$ hg init a
$ echo a > a/a
$ hg --cwd a commit -Ama
adding a
$ hg clone a b
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone a c
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo b > a/b
$ hg --cwd a commit -Amb
adding b
$ hg --cwd a parents -q
1:d2ae7f538514
should pull one change
$ hg --cwd b fetch ../a
pulling from ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --cwd b parents -q
1:d2ae7f538514
$ echo c > c/c
$ hg --cwd c commit -Amc
adding c
$ hg clone c d
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone c e
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
We cannot use the default commit message if fetching from a local
repo, because the path of the repo will be included in the commit
message, making every commit appear different.
should merge c into a
$ hg --cwd c fetch -d '0 0' -m 'automated merge' ../a
pulling from ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
updating to 2:d2ae7f538514
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging with 1:d36c0562f908
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
new changeset 3:a323a0c43ec4 merges remote changes with local
$ ls c
a
b
c
$ hg serve --cwd a -a localhost -p $HGPORT -d --pid-file=hg.pid
$ cat a/hg.pid >> "$DAEMON_PIDS"
fetch over http, no auth
(this also tests that editor is invoked if '--edit' is specified)
$ HGEDITOR=cat hg --cwd d fetch --edit http://localhost:$HGPORT/
pulling from http://localhost:$HGPORT/
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
updating to 2:d2ae7f538514
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging with 1:d36c0562f908
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
Automated merge with http://localhost:$HGPORT/
HG: Enter commit message. Lines beginning with 'HG:' are removed.
HG: Leave message empty to abort commit.
HG: --
HG: user: test
HG: branch merge
HG: branch 'default'
HG: changed c
new changeset 3:* merges remote changes with local (glob)
$ hg --cwd d tip --template '{desc}\n'
Automated merge with http://localhost:$HGPORT/
$ hg --cwd d status --rev 'tip^1' --rev tip
A c
$ hg --cwd d status --rev 'tip^2' --rev tip
A b
fetch over http with auth (should be hidden in desc)
(this also tests that editor is not invoked if '--edit' is not
specified, even though commit message is not specified explicitly)
$ HGEDITOR=cat hg --cwd e fetch http://user:password@localhost:$HGPORT/
pulling from http://user:***@localhost:$HGPORT/
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
updating to 2:d2ae7f538514
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging with 1:d36c0562f908
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
new changeset 3:* merges remote changes with local (glob)
$ hg --cwd e tip --template '{desc}\n'
Automated merge with http://localhost:$HGPORT/
$ hg clone a f
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone a g
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo f > f/f
$ hg --cwd f ci -Amf
adding f
$ echo g > g/g
$ hg --cwd g ci -Amg
adding g
$ hg clone -q f h
$ hg clone -q g i
should merge f into g
$ hg --cwd g fetch -d '0 0' --switch -m 'automated merge' ../f
pulling from ../f
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
merging with 3:6343ca3eff20
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
new changeset 4:f7faa0b7d3c6 merges remote changes with local
$ rm i/g
should abort, because i is modified
$ hg --cwd i fetch ../h
abort: uncommitted changes
[255]
test fetch with named branches
$ hg init nbase
$ echo base > nbase/a
$ hg -R nbase ci -Am base
adding a
$ hg -R nbase branch a
marked working directory as branch a
(branches are permanent and global, did you want a bookmark?)
$ echo a > nbase/a
$ hg -R nbase ci -m a
$ hg -R nbase up -C 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R nbase branch b
marked working directory as branch b
$ echo b > nbase/b
$ hg -R nbase ci -Am b
adding b
pull in change on foreign branch
$ hg clone nbase n1
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone nbase n2
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n1 up -C a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo aa > n1/a
$ hg -R n1 ci -m a1
$ hg -R n2 up -C b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n2 fetch -m 'merge' n1
pulling from n1
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
parent should be 2 (no automatic update)
$ hg -R n2 parents --template '{rev}\n'
2
$ rm -fr n1 n2
pull in changes on both foreign and local branches
$ hg clone nbase n1
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone nbase n2
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n1 up -C a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo aa > n1/a
$ hg -R n1 ci -m a1
$ hg -R n1 up -C b
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo bb > n1/b
$ hg -R n1 ci -m b1
$ hg -R n2 up -C b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n2 fetch -m 'merge' n1
pulling from n1
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent should be 4 (fast forward)
$ hg -R n2 parents --template '{rev}\n'
4
$ rm -fr n1 n2
pull changes on foreign (2 new heads) and local (1 new head) branches
with a local change
$ hg clone nbase n1
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone nbase n2
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n1 up -C a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo a1 > n1/a
$ hg -R n1 ci -m a1
$ hg -R n1 up -C b
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo bb > n1/b
$ hg -R n1 ci -m b1
$ hg -R n1 up -C 1
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo a2 > n1/a
$ hg -R n1 ci -m a2
created new head
$ hg -R n2 up -C b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo change >> n2/c
$ hg -R n2 ci -A -m local
adding c
$ hg -R n2 fetch -d '0 0' -m 'merge' n1
pulling from n1
searching for changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 3 changes to 2 files (+2 heads)
updating to 5:3c4a837a864f
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging with 3:1267f84a9ea5
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
new changeset 7:2cf2a1261f21 merges remote changes with local
parent should be 7 (new merge changeset)
$ hg -R n2 parents --template '{rev}\n'
7
$ rm -fr n1 n2
pull in changes on foreign (merge of local branch) and local (2 new
heads) with a local change
$ hg clone nbase n1
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone nbase n2
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n1 up -C a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R n1 merge b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg -R n1 ci -m merge
$ hg -R n1 up -C 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo c > n1/a
$ hg -R n1 ci -m c
$ hg -R n1 up -C 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo cc > n1/a
$ hg -R n1 ci -m cc
created new head
$ hg -R n2 up -C b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo change >> n2/b
$ hg -R n2 ci -A -m local
$ hg -R n2 fetch -m 'merge' n1
pulling from n1
searching for changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 2 changes to 1 files (+2 heads)
not merging with 1 other new branch heads (use "hg heads ." and "hg merge" to merge them)
[1]
parent should be 3 (fetch did not merge anything)
$ hg -R n2 parents --template '{rev}\n'
3
$ rm -fr n1 n2
pull in change on different branch than dirstate
$ hg init n1
$ echo a > n1/a
$ hg -R n1 ci -Am initial
adding a
$ hg clone n1 n2
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo b > n1/a
$ hg -R n1 ci -m next
$ hg -R n2 branch topic
marked working directory as branch topic
(branches are permanent and global, did you want a bookmark?)
$ hg -R n2 fetch -m merge n1
abort: working directory not at branch tip
(use 'hg update' to check out branch tip)
[255]
parent should be 0 (fetch did not update or merge anything)
$ hg -R n2 parents --template '{rev}\n'
0
$ rm -fr n1 n2
test fetch with inactive branches
$ hg init ib1
$ echo a > ib1/a
$ hg --cwd ib1 ci -Am base
adding a
$ hg --cwd ib1 branch second
marked working directory as branch second
(branches are permanent and global, did you want a bookmark?)
$ echo b > ib1/b
$ hg --cwd ib1 ci -Am onsecond
adding b
$ hg --cwd ib1 branch -f default
marked working directory as branch default
$ echo c > ib1/c
$ hg --cwd ib1 ci -Am newdefault
adding c
created new head
$ hg clone ib1 ib2
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
fetch should succeed
$ hg --cwd ib2 fetch ../ib1
pulling from ../ib1
searching for changes
no changes found
$ rm -fr ib1 ib2
test issue1726
$ hg init i1726r1
$ echo a > i1726r1/a
$ hg --cwd i1726r1 ci -Am base
adding a
$ hg clone i1726r1 i1726r2
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo b > i1726r1/a
$ hg --cwd i1726r1 ci -m second
$ echo c > i1726r2/a
$ hg --cwd i1726r2 ci -m third
$ HGMERGE=true hg --cwd i1726r2 fetch ../i1726r1
pulling from ../i1726r1
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
updating to 2:7837755a2789
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
merging with 1:d1f0c6c48ebd
merging a
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
new changeset 3:* merges remote changes with local (glob)
$ hg --cwd i1726r2 heads default --template '{rev}\n'
3
test issue2047
$ hg -q init i2047a
$ cd i2047a
$ echo a > a
$ hg -q ci -Am a
$ hg -q branch stable
$ echo b > b
$ hg -q ci -Am b
$ cd ..
$ hg -q clone -r 0 i2047a i2047b
$ cd i2047b
$ hg fetch ../i2047a
pulling from ../i2047a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
$ cd ..