copies: do not track backward copies, only renames (issue3739)
The inverse of a rename is a rename, but the inverse of a copy is not a copy.
Presenting it as such -- in particular, stuffing it into the same dict as real
copies -- causes bugs because other code starts believing the inverse copies
are real.
The only test whose output changes is test-mv-cp-st-diff.t. When a backwards
status -C command is run where a copy is involved, the inverse copy (which was
hitherto presented as a real copy) is no longer displayed.
Keeping track of inverse copies is useful in some situations -- composability
of diffs, for example, since adding "a" followed by an inverse copy "b" to "a"
is equivalent to a rename "b" to "a". However, representing them would require
a more complex data structure than the same dict in which real copies are also
stored.
$ cat >> $HGRCPATH <<EOF
> [extensions]
> graphlog=
> rebase=
>
> [alias]
> tlog = log --template "{rev}: '{desc}' {branches}\n"
> tglog = tlog --graph
> EOF
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am A
adding a
$ echo b > b
$ hg ci -Am B
adding b
$ hg mv b b-renamed
$ hg ci -m 'rename B'
$ hg up -q -C 1
$ hg mv a a-renamed
$ hg ci -m 'rename A'
created new head
$ hg tglog
@ 3: 'rename A'
|
| o 2: 'rename B'
|/
o 1: 'B'
|
o 0: 'A'
Rename is tracked:
$ hg tlog -p --git -r tip
3: 'rename A'
diff --git a/a b/a-renamed
rename from a
rename to a-renamed
Rebase the revision containing the rename:
$ hg rebase -s 3 -d 2
saved backup bundle to $TESTTMP/a/.hg/strip-backup/*-backup.hg (glob)
$ hg tglog
@ 3: 'rename A'
|
o 2: 'rename B'
|
o 1: 'B'
|
o 0: 'A'
Rename is not lost:
$ hg tlog -p --git -r tip
3: 'rename A'
diff --git a/a b/a-renamed
rename from a
rename to a-renamed
Rebased revision does not contain information about b (issue3739)
$ hg log -r 3 --debug
changeset: 3:3b905b1064f14ace3ad02353b79dd42d32981655
tag: tip
phase: draft
parent: 2:920a371a5635af23a26a011ca346cecd1cfcb942
parent: -1:0000000000000000000000000000000000000000
manifest: 3:c4a62b2b64593c8fe0523d4c1ba2e243a8bd4dce
user: test
date: Thu Jan 01 00:00:00 1970 +0000
files+: a-renamed
files-: a
extra: branch=default
extra: rebase_source=89af05cb38a281f891c6f5581dd027092da29166
description:
rename A
$ cd ..
$ hg init b
$ cd b
$ echo a > a
$ hg ci -Am A
adding a
$ echo b > b
$ hg ci -Am B
adding b
$ hg cp b b-copied
$ hg ci -Am 'copy B'
$ hg up -q -C 1
$ hg cp a a-copied
$ hg ci -m 'copy A'
created new head
$ hg tglog
@ 3: 'copy A'
|
| o 2: 'copy B'
|/
o 1: 'B'
|
o 0: 'A'
Copy is tracked:
$ hg tlog -p --git -r tip
3: 'copy A'
diff --git a/a b/a-copied
copy from a
copy to a-copied
Rebase the revision containing the copy:
$ hg rebase -s 3 -d 2
saved backup bundle to $TESTTMP/b/.hg/strip-backup/*-backup.hg (glob)
$ hg tglog
@ 3: 'copy A'
|
o 2: 'copy B'
|
o 1: 'B'
|
o 0: 'A'
Copy is not lost:
$ hg tlog -p --git -r tip
3: 'copy A'
diff --git a/a b/a-copied
copy from a
copy to a-copied
Rebased revision does not contain information about b (issue3739)
$ hg log -r 3 --debug
changeset: 3:98f6e6dbf45ab54079c2237fbd11066a5c41a11d
tag: tip
phase: draft
parent: 2:39e588434882ff77d01229d169cdc77f29e8855e
parent: -1:0000000000000000000000000000000000000000
manifest: 3:2232f329d66fffe3930d43479ae624f66322b04d
user: test
date: Thu Jan 01 00:00:00 1970 +0000
files+: a-copied
extra: branch=default
extra: rebase_source=0a8162ff18a8900df8df8ef7ac0046955205613e
description:
copy A
$ cd ..
Test rebase across repeating renames:
$ hg init repo
$ cd repo
$ echo testing > file1.txt
$ hg add file1.txt
$ hg ci -m "Adding file1"
$ hg rename file1.txt file2.txt
$ hg ci -m "Rename file1 to file2"
$ echo Unrelated change > unrelated.txt
$ hg add unrelated.txt
$ hg ci -m "Unrelated change"
$ hg rename file2.txt file1.txt
$ hg ci -m "Rename file2 back to file1"
$ hg update -r -2
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo Another unrelated change >> unrelated.txt
$ hg ci -m "Another unrelated change"
created new head
$ hg tglog
@ 4: 'Another unrelated change'
|
| o 3: 'Rename file2 back to file1'
|/
o 2: 'Unrelated change'
|
o 1: 'Rename file1 to file2'
|
o 0: 'Adding file1'
$ hg rebase -s 4 -d 3
saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-backup.hg (glob)
$ hg diff --stat -c .
unrelated.txt | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
$ cd ..