tests/test-copies-in-changeset.t

configitems: add a new config option to control new filenode functionality

This series is adding functionality where we can force create a new filenode for
some files on a merge-commit. This is meant to represent an explicit choice made
by user and hence distingusing the file in the merged commit with the file in
parent by creating a new filenode instead of using the parent one.

This introduces a experimental config option under which this functionality
will be hidden.

A new testcase is added in tests/test-merge-criss-cross.t to test the new
functionality while making the option does not break other scenarios.

Differential Revision: https://phab.mercurial-scm.org/D9026

#testcases extra sidedata

#if extra
  $ cat >> $HGRCPATH << EOF
  > [experimental]
  > copies.write-to=changeset-only
  > copies.read-from=changeset-only
  > [alias]
  > changesetcopies = log -r . -T 'files: {files}
  >   {extras % "{ifcontains("files", key, "{key}: {value}\n")}"}
  >   {extras % "{ifcontains("copies", key, "{key}: {value}\n")}"}'
  > EOF
#endif

#if sidedata
  $ cat >> $HGRCPATH << EOF
  > [format]
  > exp-use-copies-side-data-changeset = yes
  > EOF
#endif

  $ cat >> $HGRCPATH << EOF
  > [alias]
  > showcopies = log -r . -T '{file_copies % "{source} -> {name}\n"}'
  > [extensions]
  > rebase =
  > split =
  > EOF

Check that copies are recorded correctly

  $ hg init repo
  $ cd repo
#if sidedata
  $ hg debugformat -v
  format-variant     repo config default
  fncache:            yes    yes     yes
  dotencode:          yes    yes     yes
  generaldelta:       yes    yes     yes
  sparserevlog:       yes    yes     yes
  sidedata:           yes    yes      no
  persistent-nodemap:  no     no      no
  copies-sdc:         yes    yes      no
  plain-cl-delta:     yes    yes     yes
  compression:        zlib   zlib    zlib
  compression-level:  default default default
#else
  $ hg debugformat -v
  format-variant     repo config default
  fncache:            yes    yes     yes
  dotencode:          yes    yes     yes
  generaldelta:       yes    yes     yes
  sparserevlog:       yes    yes     yes
  sidedata:            no     no      no
  persistent-nodemap:  no     no      no
  copies-sdc:          no     no      no
  plain-cl-delta:     yes    yes     yes
  compression:        zlib   zlib    zlib
  compression-level:  default default default
#endif
  $ echo a > a
  $ hg add a
  $ hg ci -m initial
  $ hg cp a b
  $ hg cp a c
  $ hg cp a d
  $ hg ci -m 'copy a to b, c, and d'

#if extra

  $ hg changesetcopies
  files: b c d
  filesadded: 0
  1
  2
  
  p1copies: 0\x00a (esc)
  1\x00a (esc)
  2\x00a (esc)
#else
  $ hg debugsidedata -c -v -- -1
  2 sidedata entries
   entry-0010 size 11
    '0\x00a\n1\x00a\n2\x00a'
   entry-0012 size 5
    '0\n1\n2'
#endif

  $ hg showcopies
  a -> b
  a -> c
  a -> d

#if extra

  $ hg showcopies --config experimental.copies.read-from=compatibility
  a -> b
  a -> c
  a -> d
  $ hg showcopies --config experimental.copies.read-from=filelog-only

#endif

Check that renames are recorded correctly

  $ hg mv b b2
  $ hg ci -m 'rename b to b2'

#if extra

  $ hg changesetcopies
  files: b b2
  filesadded: 1
  filesremoved: 0
  
  p1copies: 1\x00b (esc)

#else
  $ hg debugsidedata -c -v -- -1
  3 sidedata entries
   entry-0010 size 3
    '1\x00b'
   entry-0012 size 1
    '1'
   entry-0013 size 1
    '0'
#endif

  $ hg showcopies
  b -> b2


Rename onto existing file. This should get recorded in the changeset files list and in the extras,
even though there is no filelog entry.

  $ hg cp b2 c --force
  $ hg st --copies
  M c
    b2

#if extra

  $ hg debugindex c
     rev linkrev nodeid       p1           p2
       0       1 b789fdd96dc2 000000000000 000000000000

#else

  $ hg debugindex c
     rev linkrev nodeid       p1           p2
       0       1 37d9b5d994ea 000000000000 000000000000

#endif


  $ hg ci -m 'move b onto d'

#if extra

  $ hg changesetcopies
  files: c
  
  p1copies: 0\x00b2 (esc)

#else
  $ hg debugsidedata -c -v -- -1
  1 sidedata entries
   entry-0010 size 4
    '0\x00b2'
#endif

  $ hg showcopies
  b2 -> c

#if extra

  $ hg debugindex c
     rev linkrev nodeid       p1           p2
       0       1 b789fdd96dc2 000000000000 000000000000

#else

  $ hg debugindex c
     rev linkrev nodeid       p1           p2
       0       1 37d9b5d994ea 000000000000 000000000000
       1       3 029625640347 000000000000 000000000000

#endif

Create a merge commit with copying done during merge.

  $ hg co 0
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ hg cp a e
  $ hg cp a f
  $ hg ci -m 'copy a to e and f'
  created new head
  $ hg merge 3
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
File 'a' exists on both sides, so 'g' could be recorded as being from p1 or p2, but we currently
always record it as being from p1
  $ hg cp a g
File 'd' exists only in p2, so 'h' should be from p2
  $ hg cp d h
File 'f' exists only in p1, so 'i' should be from p1
  $ hg cp f i
  $ hg ci -m 'merge'

#if extra

  $ hg changesetcopies
  files: g h i
  filesadded: 0
  1
  2
  
  p1copies: 0\x00a (esc)
  2\x00f (esc)
  p2copies: 1\x00d (esc)

#else
  $ hg debugsidedata -c -v -- -1
  3 sidedata entries
   entry-0010 size 7
    '0\x00a\n2\x00f'
   entry-0011 size 3
    '1\x00d'
   entry-0012 size 5
    '0\n1\n2'
#endif

  $ hg showcopies
  a -> g
  d -> h
  f -> i

Test writing to both changeset and filelog

  $ hg cp a j
#if extra
  $ hg ci -m 'copy a to j' --config experimental.copies.write-to=compatibility
  $ hg changesetcopies
  files: j
  filesadded: 0
  filesremoved: 
  
  p1copies: 0\x00a (esc)
  p2copies: 
#else
  $ hg ci -m 'copy a to j'
  $ hg debugsidedata -c -v -- -1
  2 sidedata entries
   entry-0010 size 3
    '0\x00a'
   entry-0012 size 1
    '0'
#endif
  $ hg debugdata j 0
  \x01 (esc)
  copy: a
  copyrev: b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
  \x01 (esc)
  a
  $ hg showcopies
  a -> j
  $ hg showcopies --config experimental.copies.read-from=compatibility
  a -> j
  $ hg showcopies --config experimental.copies.read-from=filelog-only
  a -> j
Existing copy information in the changeset gets removed on amend and writing
copy information on to the filelog
#if extra
  $ hg ci --amend -m 'copy a to j, v2' \
  > --config experimental.copies.write-to=filelog-only
  saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-*-amend.hg (glob)
  $ hg changesetcopies
  files: j
  
#else
  $ hg ci --amend -m 'copy a to j, v2'
  saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-*-amend.hg (glob)
  $ hg debugsidedata -c -v -- -1
  2 sidedata entries
   entry-0010 size 3
    '0\x00a'
   entry-0012 size 1
    '0'
#endif
  $ hg showcopies --config experimental.copies.read-from=filelog-only
  a -> j
The entries should be written to extras even if they're empty (so the client
won't have to fall back to reading from filelogs)
  $ echo x >> j
#if extra
  $ hg ci -m 'modify j' --config experimental.copies.write-to=compatibility
  $ hg changesetcopies
  files: j
  filesadded: 
  filesremoved: 
  
  p1copies: 
  p2copies: 
#else
  $ hg ci -m 'modify j'
  $ hg debugsidedata -c -v -- -1
#endif

Test writing only to filelog

  $ hg cp a k
#if extra
  $ hg ci -m 'copy a to k' --config experimental.copies.write-to=filelog-only

  $ hg changesetcopies
  files: k
  
#else
  $ hg ci -m 'copy a to k'
  $ hg debugsidedata -c -v -- -1
  2 sidedata entries
   entry-0010 size 3
    '0\x00a'
   entry-0012 size 1
    '0'
#endif

  $ hg debugdata k 0
  \x01 (esc)
  copy: a
  copyrev: b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
  \x01 (esc)
  a
#if extra
  $ hg showcopies

  $ hg showcopies --config experimental.copies.read-from=compatibility
  a -> k
  $ hg showcopies --config experimental.copies.read-from=filelog-only
  a -> k
#else
  $ hg showcopies
  a -> k
#endif

  $ cd ..

Test rebasing a commit with copy information

  $ hg init rebase-rename
  $ cd rebase-rename
  $ echo a > a
  $ hg ci -Aqm 'add a'
  $ echo a2 > a
  $ hg ci -m 'modify a'
  $ hg co -q 0
  $ hg mv a b
  $ hg ci -qm 'rename a to b'
  $ hg rebase -d 1 --config rebase.experimental.inmemory=yes
  rebasing 2:* "rename a to b" (tip) (glob)
  merging a and b to b
  saved backup bundle to $TESTTMP/rebase-rename/.hg/strip-backup/*-*-rebase.hg (glob)
  $ hg st --change . --copies
  A b
    a
  R a
  $ cd ..

Test splitting a commit

  $ hg init split
  $ cd split
  $ echo a > a
  $ echo b > b
  $ hg ci -Aqm 'add a and b'
  $ echo a2 > a
  $ hg mv b c
  $ hg ci -m 'modify a, move b to c'
  $ hg --config ui.interactive=yes split <<EOF
  > y
  > y
  > n
  > y
  > EOF
  diff --git a/a b/a
  1 hunks, 1 lines changed
  examine changes to 'a'?
  (enter ? for help) [Ynesfdaq?] y
  
  @@ -1,1 +1,1 @@
  -a
  +a2
  record this change to 'a'?
  (enter ? for help) [Ynesfdaq?] y
  
  diff --git a/b b/c
  rename from b
  rename to c
  examine changes to 'b' and 'c'?
  (enter ? for help) [Ynesfdaq?] n
  
  created new head
  diff --git a/b b/c
  rename from b
  rename to c
  examine changes to 'b' and 'c'?
  (enter ? for help) [Ynesfdaq?] y
  
  saved backup bundle to $TESTTMP/split/.hg/strip-backup/*-*-split.hg (glob)
  $ cd ..

Test committing half a rename

  $ hg init partial
  $ cd partial
  $ echo a > a
  $ hg ci -Aqm 'add a'
  $ hg mv a b
  $ hg ci -m 'remove a' a

#if sidedata

Test upgrading/downgrading to sidedata storage
==============================================

downgrading (keeping some sidedata)

  $ hg debugformat -v
  format-variant     repo config default
  fncache:            yes    yes     yes
  dotencode:          yes    yes     yes
  generaldelta:       yes    yes     yes
  sparserevlog:       yes    yes     yes
  sidedata:           yes    yes      no
  persistent-nodemap:  no     no      no
  copies-sdc:         yes    yes      no
  plain-cl-delta:     yes    yes     yes
  compression:        zlib   zlib    zlib
  compression-level:  default default default
  $ hg debugsidedata -c -- 0
  1 sidedata entries
   entry-0012 size 1
  $ hg debugsidedata -c -- 1
  1 sidedata entries
   entry-0013 size 1
  $ hg debugsidedata -m -- 0
  $ cat << EOF > .hg/hgrc
  > [format]
  > exp-use-side-data = yes
  > exp-use-copies-side-data-changeset = no
  > EOF
  $ hg debugupgraderepo --run --quiet --no-backup > /dev/null
  $ hg debugformat -v
  format-variant     repo config default
  fncache:            yes    yes     yes
  dotencode:          yes    yes     yes
  generaldelta:       yes    yes     yes
  sparserevlog:       yes    yes     yes
  sidedata:           yes    yes      no
  persistent-nodemap:  no     no      no
  copies-sdc:          no     no      no
  plain-cl-delta:     yes    yes     yes
  compression:        zlib   zlib    zlib
  compression-level:  default default default
  $ hg debugsidedata -c -- 0
  $ hg debugsidedata -c -- 1
  $ hg debugsidedata -m -- 0

upgrading

  $ cat << EOF > .hg/hgrc
  > [format]
  > exp-use-copies-side-data-changeset = yes
  > EOF
  $ hg debugupgraderepo --run --quiet --no-backup > /dev/null
  $ hg debugformat -v
  format-variant     repo config default
  fncache:            yes    yes     yes
  dotencode:          yes    yes     yes
  generaldelta:       yes    yes     yes
  sparserevlog:       yes    yes     yes
  sidedata:           yes    yes      no
  persistent-nodemap:  no     no      no
  copies-sdc:         yes    yes      no
  plain-cl-delta:     yes    yes     yes
  compression:        zlib   zlib    zlib
  compression-level:  default default default
  $ hg debugsidedata -c -- 0
  1 sidedata entries
   entry-0012 size 1
  $ hg debugsidedata -c -- 1
  1 sidedata entries
   entry-0013 size 1
  $ hg debugsidedata -m -- 0

#endif

  $ cd ..