view tests/test-git-interop.t @ 44985:1ca0047fd7e1

absorb: preserve changesets which were already empty

Most commands in Mercurial (commit, rebase, absorb itself) don’t create empty
changesets or drop them if they become empty. If there’s a changeset that’s
empty, it must be a deliberate choice of the user. At least it shouldn’t be
absorb’s responsibility to prune them. The fact that changesets that became
empty during absorb are pruned, is unaffected by this.

This case was found while writing patches which make it possible to configure
absorb and rebase to not drop empty changesets. Even without having such config
set, I think it’s valuable to preserve changesets which were already empty.

#require pygit2

Setup:
  $ GIT_AUTHOR_NAME='test'; export GIT_AUTHOR_NAME
  > GIT_AUTHOR_EMAIL='[e-mail]'; export GIT_AUTHOR_EMAIL
  > GIT_AUTHOR_DATE="2007-01-01 00:00:00 +0000"; export GIT_AUTHOR_DATE
  > GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"; export GIT_COMMITTER_NAME
  > GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"; export GIT_COMMITTER_EMAIL
  > GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"; export GIT_COMMITTER_DATE
  > count=10
  > gitcommit() {
  >    GIT_AUTHOR_DATE="2007-01-01 00:00:$count +0000";
  >    GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
  >    git commit "$@" >/dev/null 2>/dev/null || echo "git commit error"
  >    count=`expr $count + 1`
  >  }


Test auto-loading extension works:
  $ mkdir nogit
  $ cd nogit
  $ mkdir .hg
  $ echo git >> .hg/requires
  $ hg status
  abort: repository specified git format in .hg/requires but has no .git directory
  [255]
  $ git init
  Initialized empty Git repository in $TESTTMP/nogit/.git/
This status invocation shows some hg gunk because we didn't use
`hg init --git`, which fixes up .git/info/exclude for us.
  $ hg status
  ? .hg/cache/git-commits.sqlite
  ? .hg/cache/git-commits.sqlite-shm
  ? .hg/cache/git-commits.sqlite-wal
  ? .hg/requires
  $ cd ..

Now globally enable extension for the rest of the test:
  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > git=
  > [git]
  > log-index-cache-miss = yes
  > EOF

Make a new repo with git:
  $ mkdir foo
  $ cd foo
  $ git init
  Initialized empty Git repository in $TESTTMP/foo/.git/
Ignore the .hg directory within git:
  $ echo .hg >> .git/info/exclude
  $ echo alpha > alpha
  $ git add alpha
  $ gitcommit -am 'Add alpha'
  $ echo beta > beta
  $ git add beta
  $ gitcommit -am 'Add beta'
  $ echo gamma > gamma
  $ git status
  On branch master
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  	gamma
  
  nothing added to commit but untracked files present (use "git add" to track)

Without creating the .hg, hg status fails:
  $ hg status
  abort: no repository found in '$TESTTMP/foo' (.hg not found)!
  [255]
But if you run hg init --git, it works:
  $ hg init --git
  $ hg id --traceback
  heads mismatch, rebuilding dagcache
  3d9be8deba43 tip master
  $ hg status
  ? gamma
Log works too:
  $ hg log
  changeset:   1:3d9be8deba43
  bookmark:    master
  tag:         tip
  user:        test <[e-mail]>
  date:        Mon Jan 01 00:00:11 2007 +0000
  summary:     Add beta
  
  changeset:   0:c5864c9d16fb
  user:        test <[e-mail]>
  date:        Mon Jan 01 00:00:10 2007 +0000
  summary:     Add alpha
  


and bookmarks:
  $ hg bookmarks
   * master                    1:3d9be8deba43

diff even works transparently in both systems:
  $ echo blah >> alpha
  $ git diff
  diff --git a/alpha b/alpha
  index 4a58007..faed1b7 100644
  --- a/alpha
  +++ b/alpha
  @@ -1* +1,2 @@ (glob)
   alpha
  +blah
  $ hg diff --git
  diff --git a/alpha b/alpha
  --- a/alpha
  +++ b/alpha
  @@ -1,1 +1,2 @@
   alpha
  +blah

Remove a file, it shows as such:
  $ rm alpha
  $ hg status
  ! alpha
  ? gamma

Revert works:
  $ hg revert alpha --traceback
  $ hg status
  ? gamma
  $ git status
  On branch master
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  	gamma
  
  nothing added to commit but untracked files present (use "git add" to track)

Add shows sanely in both:
  $ hg add gamma
  $ hg status
  A gamma
  $ hg files
  alpha
  beta
  gamma
  $ git ls-files
  alpha
  beta
  gamma
  $ git status
  On branch master
  Changes to be committed:
    (use "git restore --staged <file>..." to unstage)
  	new file:   gamma
  

forget does what it should as well:
  $ hg forget gamma
  $ hg status
  ? gamma
  $ git status
  On branch master
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  	gamma
  
  nothing added to commit but untracked files present (use "git add" to track)

clean up untracked file
  $ rm gamma

hg log FILE

  $ echo a >> alpha
  $ hg ci -m 'more alpha' --traceback --date '1583522787 18000'
  $ echo b >> beta
  $ hg ci -m 'more beta'
  heads mismatch, rebuilding dagcache
  $ echo a >> alpha
  $ hg ci -m 'even more alpha'
  heads mismatch, rebuilding dagcache
  $ hg log -G alpha
  heads mismatch, rebuilding dagcache
  @  changeset:   4:6626247b7dc8
  :  bookmark:    master
  :  tag:         tip
  :  user:        test <test>
  :  date:        Thu Jan 01 00:00:00 1970 +0000
  :  summary:     even more alpha
  :
  o  changeset:   2:a1983dd7fb19
  :  user:        test <test>
  :  date:        Fri Mar 06 14:26:27 2020 -0500
  :  summary:     more alpha
  :
  o  changeset:   0:c5864c9d16fb
     user:        test <[e-mail]>
     date:        Mon Jan 01 00:00:10 2007 +0000
     summary:     Add alpha
  
  $ hg log -G beta
  o  changeset:   3:d8ee22687733
  :  user:        test <test>
  :  date:        Thu Jan 01 00:00:00 1970 +0000
  :  summary:     more beta
  :
  o  changeset:   1:3d9be8deba43
  |  user:        test <[e-mail]>
  ~  date:        Mon Jan 01 00:00:11 2007 +0000
     summary:     Add beta
  

  $ hg log -r "children(3d9be8deba43)" -T"{node|short} {children}\n"
  a1983dd7fb19 3:d8ee22687733

hg annotate

  $ hg annotate alpha
  0: alpha
  2: a
  4: a
  $ hg annotate beta
  1: beta
  3: b


Files in subdirectories. TODO: case-folding support, make this `A`
instead of `a`.

  $ mkdir a
  $ echo "This is file mu." > a/mu
  $ hg ci -A -m 'Introduce file a/mu'
  adding a/mu

Both hg and git agree a/mu is part of the repo

  $ git ls-files
  a/mu
  alpha
  beta
  $ hg files
  a/mu
  alpha
  beta

hg and git status both clean

  $ git status
  On branch master
  nothing to commit, working tree clean
  $ hg status
  heads mismatch, rebuilding dagcache


node|shortest works correctly
  $ hg log -T '{node}\n' | sort
  3d9be8deba43482be2c81a4cb4be1f10d85fa8bc
  6626247b7dc8f231b183b8a4761c89139baca2ad
  a1983dd7fb19cbd83ad5a1c2fc8bf3d775dea12f
  ae1ab744f95bfd5b07cf573baef98a778058537b
  c5864c9d16fb3431fe2c175ff84dc6accdbb2c18
  d8ee22687733a1991813560b15128cd9734f4b48
  $ hg log -r ae1ab744f95bfd5b07cf573baef98a778058537b --template "{shortest(node,1)}\n"
  ae

This coveres changelog.findmissing()
  $ hg merge --preview 3d9be8deba43

This covers manifest.diff()
  $ hg diff -c 3d9be8deba43
  diff -r c5864c9d16fb -r 3d9be8deba43 beta
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/beta	Mon Jan 01 00:00:11 2007 +0000
  @@ -0,0 +1,1 @@
  +beta