bundlerepo: dynamically create repository type from base repository
Previously, bundlerepository inherited from localrepo.localrepository.
You simply instantiated a bundlerepository and its __init__ called
localrepo.localrepository.__init__. Things were simple.
Unfortunately, this strategy is limiting because it assumes that
the base repository is a localrepository instance. And it assumes
various properties of localrepository, such as the arguments its
__init__ takes. And it prevents us from changing behavior of
localrepository.__init__ without also having to change derived classes.
Previous and ongoing work to abstract storage revealed these
limitations.
This commit changes the initialization strategy of bundle repositories
to dynamically create a type to represent the repository. Instead of
a static type, we instantiate a new local repo instance via
localrepo.instance(). We then combine its __class__ with
bundlerepository to produce a new type. This ensures that no matter
how localrepo.instance() decides to create a repository object, we
can derive a bundle repo object from it. i.e. localrepo.instance()
could return a type that isn't a localrepository and it would "just
work."
Well, it would "just work" if bundlerepository's custom implementations
only accessed attributes in the documented repository interface. I'm
pretty sure it violates the interface contract in a handful of
places. But we can worry about that another day. This change gets us
closer to doing more clever things around instantiating repository
instances without having to worry about teaching bundlerepository about
them.
.. api::
``bundlerepo.bundlerepository`` is no longer usable on its own.
The class is combined with the class of the base repository it is
associated with at run-time.
New bundlerepository instances can be obtained by calling
``bundlerepo.instance()`` or ``bundlerepo.makebundlerepository()``.
Differential Revision: https://phab.mercurial-scm.org/D4555
Test the "--base" flag of the rebase command. (Tests unrelated to the "--base"
flag should probably live in somewhere else)
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
> drawdag=$TESTDIR/drawdag.py
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} {desc}"
> EOF
$ rebasewithdag() {
> N=`$PYTHON -c "print($N+1)"`
> hg init repo$N && cd repo$N
> hg debugdrawdag
> hg rebase "$@" > _rebasetmp
> r=$?
> grep -v 'saved backup bundle' _rebasetmp
> [ $r -eq 0 ] && hg tglog
> cd ..
> return $r
> }
Single branching point, without merge:
$ rebasewithdag -b D -d Z <<'EOS'
> D E
> |/
> Z B C # C: branching point, E should be picked
> \|/ # B should not be picked
> A
> |
> R
> EOS
rebasing 3:d6003a550c2c "C" (C)
rebasing 5:4526cf523425 "D" (D)
rebasing 6:b296604d9846 "E" (E tip)
o 6: 4870f5e7df37 E
|
| o 5: dc999528138a D
|/
o 4: 6b3e11729672 C
|
o 3: 57e70bad1ea3 Z
|
| o 2: c1e6b162678d B
|/
o 1: 21a6c4502885 A
|
o 0: b41ce7760717 R
Multiple branching points caused by selecting a single merge changeset:
$ rebasewithdag -b E -d Z <<'EOS'
> E
> /|
> B C D # B, C: multiple branching points
> | |/ # D should not be picked
> Z | /
> \|/
> A
> |
> R
> EOS
rebasing 2:c1e6b162678d "B" (B)
rebasing 3:d6003a550c2c "C" (C)
rebasing 6:54c8f00cb91c "E" (E tip)
o 6: 00598421b616 E
|\
| o 5: 6b3e11729672 C
| |
o | 4: 85260910e847 B
|/
o 3: 57e70bad1ea3 Z
|
| o 2: 8924700906fe D
|/
o 1: 21a6c4502885 A
|
o 0: b41ce7760717 R
Rebase should not extend the "--base" revset using "descendants":
$ rebasewithdag -b B -d Z <<'EOS'
> E
> /|
> Z B C # descendants(B) = B+E. With E, C will be included incorrectly
> \|/
> A
> |
> R
> EOS
rebasing 2:c1e6b162678d "B" (B)
rebasing 5:54c8f00cb91c "E" (E tip)
o 5: e583bf3ff54c E
|\
| o 4: 85260910e847 B
| |
| o 3: 57e70bad1ea3 Z
| |
o | 2: d6003a550c2c C
|/
o 1: 21a6c4502885 A
|
o 0: b41ce7760717 R
Rebase should not simplify the "--base" revset using "roots":
$ rebasewithdag -b B+E -d Z <<'EOS'
> E
> /|
> Z B C # roots(B+E) = B. Without E, C will be missed incorrectly
> \|/
> A
> |
> R
> EOS
rebasing 2:c1e6b162678d "B" (B)
rebasing 3:d6003a550c2c "C" (C)
rebasing 5:54c8f00cb91c "E" (E tip)
o 5: 00598421b616 E
|\
| o 4: 6b3e11729672 C
| |
o | 3: 85260910e847 B
|/
o 2: 57e70bad1ea3 Z
|
o 1: 21a6c4502885 A
|
o 0: b41ce7760717 R
The destination is one of the two branching points of a merge:
$ rebasewithdag -b F -d Z <<'EOS'
> F
> / \
> E D
> / /
> Z C
> \ /
> B
> |
> A
> EOS
nothing to rebase
[1]
Multiple branching points caused by multiple bases (issue5420):
$ rebasewithdag -b E1+E2+C2+B1 -d Z <<'EOS'
> Z E2
> | /
> F E1 C2
> |/ /
> E C1 B2
> |/ /
> C B1
> |/
> B
> |
> A
> |
> R
> EOS
rebasing 3:a113dbaa660a "B1" (B1)
rebasing 5:06ce7b1cc8c2 "B2" (B2)
rebasing 6:0ac98cce32d3 "C1" (C1)
rebasing 8:781512f5e33d "C2" (C2)
rebasing 9:428d8c18f641 "E1" (E1)
rebasing 11:e1bf82f6b6df "E2" (E2)
o 12: e4a37b6fdbd2 E2
|
o 11: 9675bea983df E1
|
| o 10: 4faf5d4c80dc C2
| |
| o 9: d4799b1ad57d C1
|/
| o 8: 772732dc64d6 B2
| |
| o 7: ad3ac528a49f B1
|/
o 6: 2cbdfca6b9d5 Z
|
o 5: fcdb3293ec13 F
|
o 4: a4652bb8ac54 E
|
o 3: bd5548558fcf C
|
o 2: c1e6b162678d B
|
o 1: 21a6c4502885 A
|
o 0: b41ce7760717 R
Multiple branching points with multiple merges:
$ rebasewithdag -b G+P -d Z <<'EOS'
> G H P
> |\ /| |\
> F E D M N
> \|/| /| |\
> Z C B I J K L
> \|/ |/ |/
> A A A
> EOS
rebasing 2:dc0947a82db8 "C" (C)
rebasing 8:4e4f9194f9f1 "D" (D)
rebasing 9:03ca77807e91 "E" (E)
rebasing 10:afc707c82df0 "F" (F)
rebasing 13:690dfff91e9e "G" (G)
rebasing 14:2893b886bb10 "H" (H)
rebasing 3:08ebfeb61bac "I" (I)
rebasing 4:a0a5005cec67 "J" (J)
rebasing 5:83780307a7e8 "K" (K)
rebasing 6:e131637a1cb6 "L" (L)
rebasing 11:d1f6d0c3c7e4 "M" (M)
rebasing 12:7aaec6f81888 "N" (N)
rebasing 15:325bc8f1760d "P" (P tip)
o 15: 6ef6a0ea3b18 P
|\
| o 14: 20ba3610a7e5 N
| |\
o \ \ 13: cd4f6c06d2ab M
|\ \ \
| | | o 12: bca872041455 L
| | | |
| | o | 11: 7bbb6c8a6ad7 K
| | |/
| o / 10: de0cbffe893e J
| |/
o / 9: 0e710f176a88 I
|/
| o 8: 52507bab39ca H
| |\
| | | o 7: bb5fe4652f0d G
| | |/|
| | | o 6: f4ad4b31daf4 F
| | | |
| | o | 5: b168f85f2e78 E
| | |/
| o | 4: 8d09fcdb5594 D
| |\|
+---o 3: ab70b4c5a9c9 C
| |
o | 2: 262e37e34f63 Z
| |
| o 1: 112478962961 B
|/
o 0: 426bada5c675 A
Slightly more complex merge case (mentioned in https://www.mercurial-scm.org/pipermail/mercurial-devel/2016-November/091074.html):
$ rebasewithdag -b A3+B3 -d Z <<'EOF'
> Z C1 A3 B3
> | / / \ / \
> M3 C0 A1 A2 B1 B2
> | / | | | |
> M2 M1 C1 C1 M3
> |
> M1
> |
> M0
> EOF
rebasing 4:8817fae53c94 "C0" (C0)
rebasing 6:06ca5dfe3b5b "B2" (B2)
rebasing 7:73508237b032 "C1" (C1)
rebasing 9:fdb955e2faed "A2" (A2)
rebasing 11:4e449bd1a643 "A3" (A3)
rebasing 10:0a33b0519128 "B1" (B1)
rebasing 12:209327807c3a "B3" (B3 tip)
o 12: ceb984566332 B3
|\
| o 11: 19d93caac497 B1
| |
| | o 10: 058e73d3916b A3
| | |\
| +---o 9: 0ba13ad72234 A2
| | |
| o | 8: c122c2af10c6 C1
| | |
o | | 7: 74275896650e B2
| | |
| o | 6: 455ba9bd3ea2 C0
|/ /
o | 5: b3d7d2fda53b Z
| |
o | 4: 182ab6383dd7 M3
| |
o | 3: 6c3f73563d5f M2
| |
| o 2: 88c860fffcc2 A1
|/
o 1: bc852baa85dd M1
|
o 0: dbdfc5c9bcd5 M0
Disconnected graph:
$ rebasewithdag -b B -d Z <<'EOS'
> B
> |
> Z A
> EOS
nothing to rebase from 112478962961 to 48b9aae0607f
[1]
Multiple roots. Roots are ancestors of dest:
$ rebasewithdag -b B+D -d Z <<'EOF'
> D Z B
> \|\|
> C A
> EOF
rebasing 2:112478962961 "B" (B)
rebasing 3:b70f76719894 "D" (D)
o 4: 511efad7bf13 D
|
| o 3: 25c4e279af62 B
|/
o 2: 3a49f54d7bb1 Z
|\
| o 1: 96cc3511f894 C
|
o 0: 426bada5c675 A
Multiple roots. One root is not an ancestor of dest:
$ rebasewithdag -b B+D -d Z <<'EOF'
> Z B D
> \|\|
> A C
> EOF
nothing to rebase from f675d5a1c6a4+b70f76719894 to 262e37e34f63
[1]
Multiple roots. One root is not an ancestor of dest. Select using a merge:
$ rebasewithdag -b E -d Z <<'EOF'
> E
> |\
> Z B D
> \|\|
> A C
> EOF
rebasing 2:f675d5a1c6a4 "B" (B)
rebasing 5:f68696fe6af8 "E" (E tip)
o 5: f6e6f5081554 E
|\
| o 4: 30cabcba27be B
| |\
| | o 3: 262e37e34f63 Z
| | |
o | | 2: b70f76719894 D
|/ /
o / 1: 96cc3511f894 C
/
o 0: 426bada5c675 A
Multiple roots. Two children share two parents while dest has only one parent:
$ rebasewithdag -b B+D -d Z <<'EOF'
> Z B D
> \|\|\
> A C A
> EOF
rebasing 2:f675d5a1c6a4 "B" (B)
rebasing 3:c2a779e13b56 "D" (D)
o 4: 5eecd056b5f8 D
|\
+---o 3: 30cabcba27be B
| |/
| o 2: 262e37e34f63 Z
| |
o | 1: 96cc3511f894 C
/
o 0: 426bada5c675 A