view tests/test-bundle-r.t @ 46667:93e9f448273c

rhg: Add support for automatic fallback to Python

`rhg` is a command-line application that can do a small subset of what
`hg` can. It is written entirely in Rust, which avoids the cost of starting
a Python interpreter and importing many Python modules.
In a script that runs many `hg` commands, this cost can add up.

However making users decide when to use `rhg` instead of `hg` is
not practical as we want the subset of supported functionality
to grow over time.

Instead we introduce "fallback" behavior where, when `rhg` encounters
something (a sub-command, a repository format, …) that is not implemented
in Rust-only, it does nothing but silently start a subprocess of
Python-based `hg` running the same command.
That way `rhg` becomes a drop-in replacement for `hg` that sometimes
goes faster. Whether Python is used should be an implementation detail
not apparent to users (other than through speed).

A new `fallback` value is added to the previously introduced
`rhg.on-unsupported` configuration key. When in this mode, the new
`rhg.fallback-executable` config is determine what command to use
to run a Python-based `hg`.

The previous `rhg.on-unsupported = abort-silent` configuration was designed
to let a wrapper script call `rhg` and then fall back to `hg` based on the
exit code. This is still available, but having fallback behavior built-in
in rhg might be easier for users instead of leaving that script "as an
exercise for the reader".

Using a subprocess like this is not idea, especially when `rhg` is to be
installed in `$PATH` as `hg`, since the other `hg.py` executable needs
to still be available… somewhere. Eventually this could be replaced
by using PyOxidizer to a have a single executable that embeds a Python
interpreter, but only starts it when needed.

Differential Revision: https://phab.mercurial-scm.org/D10093

  $ hg init test
  $ cd test
  $ hg unbundle "$TESTDIR/bundles/remote.hg"
  adding changesets
  adding manifests
  adding file changes
  added 9 changesets with 7 changes to 4 files (+1 heads)
  new changesets bfaf4b5cbf01:916f1afdef90 (9 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg up tip
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd ..

  $ for i in 0 1 2 3 4 5 6 7 8; do
  >    mkdir test-"$i"
  >    hg --cwd test-"$i" init
  >    hg -R test bundle -r "$i" test-"$i".hg test-"$i"
  >    cd test-"$i"
  >    hg unbundle ../test-"$i".hg
  >    hg verify
  >    hg tip -q
  >    cd ..
  > done
  searching for changes
  1 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets bfaf4b5cbf01 (1 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 1 changesets with 1 changes to 1 files
  0:bfaf4b5cbf01
  searching for changes
  2 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  new changesets bfaf4b5cbf01:21f32785131f (2 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 2 changesets with 2 changes to 1 files
  1:21f32785131f
  searching for changes
  3 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 1 files
  new changesets bfaf4b5cbf01:4ce51a113780 (3 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 3 changesets with 3 changes to 1 files
  2:4ce51a113780
  searching for changes
  4 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 4 changes to 1 files
  new changesets bfaf4b5cbf01:93ee6ab32777 (4 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 4 changesets with 4 changes to 1 files
  3:93ee6ab32777
  searching for changes
  2 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  new changesets bfaf4b5cbf01:c70afb1ee985 (2 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 2 changesets with 2 changes to 1 files
  1:c70afb1ee985
  searching for changes
  3 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 1 files
  new changesets bfaf4b5cbf01:f03ae5a9b979 (3 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 3 changesets with 3 changes to 1 files
  2:f03ae5a9b979
  searching for changes
  4 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 5 changes to 2 files
  new changesets bfaf4b5cbf01:095cb14b1b4d (4 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 4 changesets with 5 changes to 2 files
  3:095cb14b1b4d
  searching for changes
  5 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 6 changes to 3 files
  new changesets bfaf4b5cbf01:faa2e4234c7a (5 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 5 changesets with 6 changes to 3 files
  4:faa2e4234c7a
  searching for changes
  5 changesets found
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 5 changes to 2 files
  new changesets bfaf4b5cbf01:916f1afdef90 (5 drafts)
  (run 'hg update' to get a working copy)
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 5 changesets with 5 changes to 2 files
  4:916f1afdef90
  $ cd test-8
  $ hg pull ../test-7
  pulling from ../test-7
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 2 changes to 3 files (+1 heads)
  new changesets c70afb1ee985:faa2e4234c7a
  1 local changesets published
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 9 changesets with 7 changes to 4 files
  $ hg rollback
  repository tip rolled back to revision 4 (undo pull)
  $ cd ..

should fail

  $ hg -R test bundle --base 2 -r tip test-bundle-branch1.hg test-3
  abort: --base is incompatible with specifying a destination
  [10]
  $ hg -R test bundle -a -r tip test-bundle-branch1.hg test-3
  abort: --all is incompatible with specifying a destination
  [10]
  $ hg -R test bundle -r tip test-bundle-branch1.hg
  abort: repository default-push not found
  [255]

  $ hg -R test bundle --base 2 -r tip test-bundle-branch1.hg
  2 changesets found
  $ hg -R test bundle --base 2 -r 7 test-bundle-branch2.hg
  4 changesets found
  $ hg -R test bundle --base 2 test-bundle-all.hg
  6 changesets found
  $ hg -R test bundle --base 2 --all test-bundle-all-2.hg
  ignoring --base because --all was specified
  9 changesets found
  $ hg -R test bundle --base 3 -r tip test-bundle-should-fail.hg
  1 changesets found

empty bundle

  $ hg -R test bundle --base 7 --base 8 test-bundle-empty.hg
  no changes found
  [1]

issue76 msg2163

  $ hg -R test bundle --base 3 -r 3 -r 3 test-bundle-cset-3.hg
  no changes found
  [1]

Issue1910: 'hg bundle --base $head' does not exclude $head from
result

  $ hg -R test bundle --base 7 test-bundle-cset-7.hg
  4 changesets found

  $ hg clone test-2 test-9
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd test-9

revision 2

  $ hg tip -q
  2:4ce51a113780
  $ hg unbundle ../test-bundle-should-fail.hg
  adding changesets
  transaction abort!
  rollback completed
  abort: 00changelog.i@93ee6ab32777cd430e07da694794fb6a4f917712: unknown parent
  [50]

revision 2

  $ hg tip -q
  2:4ce51a113780
  $ hg unbundle ../test-bundle-all.hg
  adding changesets
  adding manifests
  adding file changes
  added 6 changesets with 4 changes to 4 files (+1 heads)
  new changesets 93ee6ab32777:916f1afdef90 (6 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)

revision 8

  $ hg tip -q
  8:916f1afdef90
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 9 changesets with 7 changes to 4 files
  $ hg rollback
  repository tip rolled back to revision 2 (undo unbundle)

revision 2

  $ hg tip -q
  2:4ce51a113780
  $ hg unbundle ../test-bundle-branch1.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 93ee6ab32777:916f1afdef90 (2 drafts)
  (run 'hg update' to get a working copy)

revision 4

  $ hg tip -q
  4:916f1afdef90
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 5 changesets with 5 changes to 2 files
  $ hg rollback
  repository tip rolled back to revision 2 (undo unbundle)
  $ hg unbundle ../test-bundle-branch2.hg
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 3 changes to 3 files (+1 heads)
  new changesets c70afb1ee985:faa2e4234c7a (4 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)

revision 6

  $ hg tip -q
  6:faa2e4234c7a
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 7 changesets with 6 changes to 3 files
  $ hg rollback
  repository tip rolled back to revision 2 (undo unbundle)
  $ hg unbundle ../test-bundle-cset-7.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 93ee6ab32777:916f1afdef90 (2 drafts)
  (run 'hg update' to get a working copy)

revision 4

  $ hg tip -q
  4:916f1afdef90
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 5 changesets with 5 changes to 2 files

  $ cd ../test
  $ hg merge 7
  note: possible conflict - afile was renamed multiple times to:
   adifferentfile
   anotherfile
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m merge
  $ cd ..
  $ hg -R test bundle --base 2 test-bundle-head.hg
  7 changesets found
  $ hg clone test-2 test-10
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd test-10
  $ hg unbundle ../test-bundle-head.hg
  adding changesets
  adding manifests
  adding file changes
  added 7 changesets with 4 changes to 4 files
  new changesets 93ee6ab32777:03fc0b0e347c (7 drafts)
  (run 'hg update' to get a working copy)

revision 9

  $ hg tip -q
  9:03fc0b0e347c
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 10 changesets with 7 changes to 4 files

  $ cd ..