view tests/test-mq-guards.t @ 39018:e793e11e1462

changegroup: introduce requests to define delta generation

Currently, we iterate through each revision we will be producing
a delta for then call into 1 of 2 functions for generating that
delta. Deltas are emitted as we iterate.

A problem with this model is that revision generation is tightly
coupled to the changegroup code. And the storage layer needs to
expose APIs like deltaparent() so changegroup delta generation
can produce a delta with that knowledge.

Another problem is that in this model, deltas can only be produced
sequentially after the previous delta was produced and emitted.
Some storage backends might be capable of producing deltas in
parallel (e.g. if the changegroup deltas are cached somewhere).

This commit aims to solve these problems by turning delta generation
into a 2 phase implementation where the first phase determines
info about all the deltas that need to be generated and the 2nd
phase resolves those deltas.

We introduce a "revisiondeltarequest" object that holds data about
a to-be-generated delta. We perform a full pass over all revisions
whose delta is to be generated and generate a "revisiondeltarequest"
for each. Then we iterate over the "revisiondeltarequest" instances
and derive a "revisiondelta" for each.

This patch was quite large. In order to avoid even more churn, aspects
of the implementation are less than ideal. e.g. we're recording
revision numbers instead of nodes in a few places and we don't
yet have a formal API for resolving an iterable of revisiondeltarequest
instances. Things will be improved in subsequent commits.

Unfortunately, this commit reduces performance substantially. For
`hg perfchangegroupchangelog` on my hg repo:

! wall 1.512607 comb 1.510000 user 1.490000 sys 0.020000 (best of 7)
! wall 2.150863 comb 2.150000 user 2.150000 sys 0.000000 (best of 5)

And for `hg bundle -t none-v2 -a` for the mozilla-unified repo:

178.32user 4.22system 3:02.59elapsed
190.97user 4.17system 3:15.19elapsed

Some of this was attributed to changelog slowdown. `hg
perfchangegroupchangelog` on mozilla-unified:

! wall 21.688715 comb 21.690000 user 21.570000 sys 0.120000 (best of 3)
! wall 25.683659 comb 25.680000 user 25.540000 sys 0.140000 (best of 3)

Profiling seems to reveal that the changelog slowdown is due to reading
changelog revisions multiple times. First in the linknode callback
to resolve the set of files changed. Second in the delta generation.
Before, we likely had hit the last revision cache in the revlog when
doing delta generation since we performed that immediately after
performing the linknode callback.

I'm not exactly sure where the other ~8s are being spent. It might be
from overhead of constructing a few million revisiondeltarequest
objects. I'm OK with the regression for now because it is in service
of a larger cause (storage abstraction). I'll try to profile later
and claw back the performance.

Differential Revision: https://phab.mercurial-scm.org/D4215

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH

  $ hg init
  $ hg qinit

  $ echo x > x
  $ hg ci -Ama
  adding x

  $ hg qnew a.patch
  $ echo a > a
  $ hg add a
  $ hg qrefresh

  $ hg qnew b.patch
  $ echo b > b
  $ hg add b
  $ hg qrefresh

  $ hg qnew c.patch
  $ echo c > c
  $ hg add c
  $ hg qrefresh

  $ hg qpop -a
  popping c.patch
  popping b.patch
  popping a.patch
  patch queue now empty


should fail

  $ hg qguard does-not-exist.patch +bleh
  abort: no patch named does-not-exist.patch
  [255]


should fail

  $ hg qguard +fail
  abort: no patches applied
  [255]

  $ hg qpush
  applying a.patch
  now at: a.patch

should guard a.patch

  $ hg qguard +a

should print +a

  $ hg qguard
  a.patch: +a
  $ hg qpop
  popping a.patch
  patch queue now empty


should fail

  $ hg qpush a.patch
  cannot push 'a.patch' - guarded by '+a'
  [1]

  $ hg qguard a.patch
  a.patch: +a

should push b.patch

  $ hg qpush
  applying b.patch
  now at: b.patch

  $ hg qpop
  popping b.patch
  patch queue now empty

test selection of an empty guard

  $ hg qselect ""
  abort: guard cannot be an empty string
  [255]
  $ hg qselect a
  number of unguarded, unapplied patches has changed from 2 to 3

should push a.patch

  $ hg qpush
  applying a.patch
  now at: a.patch

  $ hg qguard -- c.patch -a

should print -a

  $ hg qguard c.patch
  c.patch: -a


should skip c.patch

  $ hg qpush -a
  applying b.patch
  skipping c.patch - guarded by '-a'
  now at: b.patch
  $ hg qnext
  all patches applied
  [1]

should display b.patch

  $ hg qtop
  b.patch

  $ hg qguard -n c.patch

should push c.patch

  $ hg qpush -a
  applying c.patch
  now at: c.patch

  $ hg qpop -a
  popping c.patch
  popping b.patch
  popping a.patch
  patch queue now empty
  $ hg qselect -n
  guards deactivated
  number of unguarded, unapplied patches has changed from 3 to 2

should push all

  $ hg qpush -a
  applying b.patch
  applying c.patch
  now at: c.patch

  $ hg qpop -a
  popping c.patch
  popping b.patch
  patch queue now empty
  $ hg qguard a.patch +1
  $ hg qguard b.patch +2
  $ hg qselect 1
  number of unguarded, unapplied patches has changed from 1 to 2

should push a.patch, not b.patch

  $ hg qpush
  applying a.patch
  now at: a.patch
  $ hg qpush
  applying c.patch
  now at: c.patch
  $ hg qpop -a
  popping c.patch
  popping a.patch
  patch queue now empty

  $ hg qselect 2

should push b.patch

  $ hg qpush
  applying b.patch
  now at: b.patch
  $ hg qpush -a
  applying c.patch
  now at: c.patch
  $ hg qprev
  b.patch

Used to be an issue with holes in the patch sequence
So, put one hole on the base and ask for topmost patch.

  $ hg qtop
  c.patch
  $ hg qpop -a
  popping c.patch
  popping b.patch
  patch queue now empty

  $ hg qselect 1 2
  number of unguarded, unapplied patches has changed from 2 to 3

should push a.patch, b.patch

  $ hg qpush
  applying a.patch
  now at: a.patch
  $ hg qpush
  applying b.patch
  now at: b.patch
  $ hg qpop -a
  popping b.patch
  popping a.patch
  patch queue now empty

  $ hg qguard -- a.patch +1 +2 -3
  $ hg qselect 1 2 3
  number of unguarded, unapplied patches has changed from 3 to 2


list patches and guards

  $ hg qguard -l
  a.patch: +1 +2 -3
  b.patch: +2
  c.patch: unguarded

have at least one patch applied to test coloring

  $ hg qpush
  applying b.patch
  now at: b.patch

list patches and guards with color

  $ hg --config extensions.color= qguard --config color.mode=ansi \
  >     -l --color=always
  \x1b[0;30;1ma.patch\x1b[0m: \x1b[0;33m+1\x1b[0m \x1b[0;33m+2\x1b[0m \x1b[0;31m-3\x1b[0m (esc)
  \x1b[0;34;1;4mb.patch\x1b[0m: \x1b[0;33m+2\x1b[0m (esc)
  \x1b[0;30;1mc.patch\x1b[0m: \x1b[0;32munguarded\x1b[0m (esc)

should pop b.patch

  $ hg qpop
  popping b.patch
  patch queue now empty

list series

  $ hg qseries -v
  0 G a.patch
  1 U b.patch
  2 U c.patch

list guards

  $ hg qselect
  1
  2
  3

should push b.patch

  $ hg qpush
  applying b.patch
  now at: b.patch

  $ hg qpush -a
  applying c.patch
  now at: c.patch
  $ hg qselect -n --reapply -v
  guards deactivated
  popping guarded patches
  popping c.patch
  popping b.patch
  patch queue now empty
  reapplying unguarded patches
  skipping a.patch - guarded by '+1' '+2'
  skipping b.patch - guarded by '+2'
  skipping a.patch - guarded by '+1' '+2'
  skipping b.patch - guarded by '+2'
  applying c.patch
  patching file c
  adding c
  committing files:
  c
  committing manifest
  committing changelog
  now at: c.patch

guards in series file: +1 +2 -3

  $ hg qselect -s
  +1
  +2
  -3

should show c.patch

  $ hg qapplied
  c.patch

  $ hg qrename a.patch new.patch

should show :


new.patch: +1 +2 -3


b.patch: +2


c.patch: unguarded

  $ hg qguard -l
  new.patch: +1 +2 -3
  b.patch: +2
  c.patch: unguarded

  $ hg qnew d.patch
  $ hg qpop
  popping d.patch
  now at: c.patch

should show new.patch and b.patch as Guarded, c.patch as Applied


and d.patch as Unapplied

  $ hg qseries -v
  0 G new.patch
  1 G b.patch
  2 A c.patch
  3 U d.patch

qseries again, but with color

  $ hg --config extensions.color= --config color.mode=ansi qseries -v --color=always
  0 G \x1b[0;30;1mnew.patch\x1b[0m (esc)
  1 G \x1b[0;30;1mb.patch\x1b[0m (esc)
  2 A \x1b[0;34;1;4mc.patch\x1b[0m (esc)
  3 U \x1b[0;30;1md.patch\x1b[0m (esc)

  $ hg qguard d.patch +2

new.patch, b.patch: Guarded. c.patch: Applied. d.patch: Guarded.

  $ hg qseries -v
  0 G new.patch
  1 G b.patch
  2 A c.patch
  3 G d.patch

  $ qappunappv()
  > {
  >     for command in qapplied "qapplied -v" qunapplied "qunapplied -v"; do
  >         echo % hg $command
  >         hg $command
  >     done
  > }

  $ hg qpop -a
  popping c.patch
  patch queue now empty
  $ hg qguard -l
  new.patch: +1 +2 -3
  b.patch: +2
  c.patch: unguarded
  d.patch: +2
  $ qappunappv
  % hg qapplied
  % hg qapplied -v
  % hg qunapplied
  c.patch
  % hg qunapplied -v
  0 G new.patch
  1 G b.patch
  2 U c.patch
  3 G d.patch
  $ hg qselect 1
  number of unguarded, unapplied patches has changed from 1 to 2
  $ qappunappv
  % hg qapplied
  % hg qapplied -v
  % hg qunapplied
  new.patch
  c.patch
  % hg qunapplied -v
  0 U new.patch
  1 G b.patch
  2 U c.patch
  3 G d.patch
  $ hg qpush -a
  applying new.patch
  skipping b.patch - guarded by '+2'
  applying c.patch
  skipping d.patch - guarded by '+2'
  now at: c.patch
  $ qappunappv
  % hg qapplied
  new.patch
  c.patch
  % hg qapplied -v
  0 A new.patch
  1 G b.patch
  2 A c.patch
  % hg qunapplied
  % hg qunapplied -v
  3 G d.patch
  $ hg qselect 2
  number of unguarded, unapplied patches has changed from 0 to 1
  $ qappunappv
  % hg qapplied
  new.patch
  c.patch
  % hg qapplied -v
  0 A new.patch
  1 U b.patch
  2 A c.patch
  % hg qunapplied
  d.patch
  % hg qunapplied -v
  3 U d.patch

  $ for patch in `hg qseries`; do
  >     echo % hg qapplied $patch
  >     hg qapplied $patch
  >     echo % hg qunapplied $patch
  >     hg qunapplied $patch
  > done
  % hg qapplied new.patch
  new.patch
  % hg qunapplied new.patch
  b.patch
  d.patch
  % hg qapplied b.patch
  new.patch
  % hg qunapplied b.patch
  d.patch
  % hg qapplied c.patch
  new.patch
  c.patch
  % hg qunapplied c.patch
  d.patch
  % hg qapplied d.patch
  new.patch
  c.patch
  % hg qunapplied d.patch


hg qseries -m: only b.patch should be shown
the guards file was not ignored in the past

  $ hg qdelete -k b.patch
  $ hg qseries -m
  b.patch

hg qseries -m with color

  $ hg --config extensions.color= --config color.mode=ansi qseries -m --color=always
  \x1b[0;31;1mb.patch\x1b[0m (esc)


excercise corner cases in "qselect --reapply"

  $ hg qpop -a
  popping c.patch
  popping new.patch
  patch queue now empty
  $ hg qguard -- new.patch -not-new
  $ hg qguard -- c.patch -not-c
  $ hg qguard -- d.patch -not-d
  $ hg qpush -a
  applying new.patch
  applying c.patch
  applying d.patch
  patch d.patch is empty
  now at: d.patch
  $ hg qguard -l
  new.patch: -not-new
  c.patch: -not-c
  d.patch: -not-d
  $ hg qselect --reapply not-d
  popping guarded patches
  popping d.patch
  now at: c.patch
  reapplying unguarded patches
  cannot push 'd.patch' - guarded by '-not-d'
  $ hg qser -v
  0 A new.patch
  1 A c.patch
  2 G d.patch
  $ hg qselect --reapply -n
  guards deactivated
  $ hg qpush
  applying d.patch
  patch d.patch is empty
  now at: d.patch
  $ hg qser -v
  0 A new.patch
  1 A c.patch
  2 A d.patch
  $ hg qselect --reapply not-c
  popping guarded patches
  popping d.patch
  popping c.patch
  now at: new.patch
  reapplying unguarded patches
  applying d.patch
  patch d.patch is empty
  now at: d.patch
  $ hg qser -v
  0 A new.patch
  1 G c.patch
  2 A d.patch
  $ hg qselect --reapply not-new
  popping guarded patches
  popping d.patch
  popping new.patch
  patch queue now empty
  reapplying unguarded patches
  applying c.patch
  applying d.patch
  patch d.patch is empty
  now at: d.patch
  $ hg qser -v
  0 G new.patch
  1 A c.patch
  2 A d.patch

test that qselect shows "number of guarded, applied patches" correctly

  $ hg qimport -q -e b.patch
  adding b.patch to series file
  $ hg qguard -- b.patch -not-b
  $ hg qpop -a -q
  patch queue now empty
  $ hg qunapplied -v
  0 G new.patch
  1 U c.patch
  2 U d.patch
  3 U b.patch
  $ hg qselect not-new not-c
  number of unguarded, unapplied patches has changed from 3 to 2
  $ hg qpush -q -a
  patch d.patch is empty
  now at: b.patch

  $ hg qapplied -v
  0 G new.patch
  1 G c.patch
  2 A d.patch
  3 A b.patch
  $ hg qselect --none
  guards deactivated
  $ hg qselect not-new not-c not-d
  number of guarded, applied patches has changed from 0 to 1

test that "qselect --reapply" reapplies patches successfully when the
already applied patch becomes unguarded and it follows the already
guarded (= not yet applied) one.

  $ hg qpop -q -a
  patch queue now empty
  $ hg qselect not-new not-c
  number of unguarded, unapplied patches has changed from 1 to 2
  $ hg qpush -q -a
  patch d.patch is empty
  now at: b.patch
  $ hg qapplied -v
  0 G new.patch
  1 G c.patch
  2 A d.patch
  3 A b.patch
  $ hg qselect -q --reapply not-c not-b
  now at: d.patch
  cannot push 'b.patch' - guarded by '-not-b'
  $ hg qseries -v
  0 U new.patch
  1 G c.patch
  2 A d.patch
  3 G b.patch

test that "qselect --reapply" checks applied patches correctly when no
applied patches becomes guarded but some of unapplied ones become
unguarded.

  $ hg qpop -q -a
  patch queue now empty
  $ hg qselect not-new not-c not-d
  number of unguarded, unapplied patches has changed from 2 to 1
  $ hg qpush -q -a
  now at: b.patch
  $ hg qapplied -v
  0 G new.patch
  1 G c.patch
  2 G d.patch
  3 A b.patch
  $ hg qselect -q --reapply not-new not-c
  $ hg qseries -v
  0 G new.patch
  1 G c.patch
  2 U d.patch
  3 A b.patch