bundlespec: allow the bundle spec to control the bundle version

This makes it possible to create bundle using changelog-v3.

The `hg debugbundle --spec` output is borked, but this will be fixed in coming
changesets.

tests/test-bundle-type.t

@@ -1,241 +1,270 b''
 bundle w/o type option
 
   $ hg init t1
   $ hg init t2
   $ cd t1
   $ echo blablablablabla > file.txt
   $ hg ci -Ama
   adding file.txt
   $ hg log | grep summary
   summary:     a
   $ hg bundle ../b1 ../t2
   searching for changes
   1 changesets found
 
   $ cd ../t2
   $ hg unbundle ../b1
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   new changesets c35a0f9217e6 (1 drafts)
   (run 'hg update' to get a working copy)
   $ hg up
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg log | grep summary
   summary:     a
   $ cd ..
 
 Unknown compression type is rejected
 
   $ hg init t3
   $ cd t3
   $ hg -q unbundle ../b1
   $ hg bundle -a -t unknown out.hg
   abort: unknown is not a recognized bundle specification
   (see 'hg help bundlespec' for supported values for --type)
   [10]
 
   $ hg bundle -a -t unknown-v2 out.hg
   abort: unknown compression is not supported
   (see 'hg help bundlespec' for supported values for --type)
   [10]
 
   $ cd ..
 
 test bundle types
 
   $ testbundle() {
   >   echo % test bundle type $1
   >   hg init t$1
   >   cd t1
   >   hg bundle -t $1 ../b$1 ../t$1
   >   f -q -B6 -D ../b$1; echo
   >   cd ../t$1
   >   hg debugbundle ../b$1
   >   hg debugbundle --spec ../b$1
   >   echo
   >   cd ..
   > }
 
   $ for t in "None" "bzip2" "gzip" "none-v2" "v2" "v1" "gzip-v1"; do
   >   testbundle $t
   > done
   % test bundle type None
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   none-v2
   
   % test bundle type bzip2
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {Compression: BZ}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   bzip2-v2
   
   % test bundle type gzip
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {Compression: GZ}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   gzip-v2
   
   % test bundle type none-v2
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   none-v2
   
   % test bundle type v2
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {Compression: BZ}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   bzip2-v2
   
   % test bundle type v1
   searching for changes
   1 changesets found
   HG10BZ
   c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   bzip2-v1
   
   % test bundle type gzip-v1
   searching for changes
   1 changesets found
   HG10GZ
   c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   gzip-v1
   
 
 Compression level can be adjusted for bundle2 bundles
 
   $ hg init test-complevel
   $ cd test-complevel
 
   $ cat > file0 << EOF
   > this is a file
   > with some text
   > and some more text
   > and other content
   > EOF
   $ cat > file1 << EOF
   > this is another file
   > with some other content
   > and repeated, repeated, repeated, repeated content
   > EOF
   $ hg -q commit -A -m initial
 
   $ hg bundle -a -t gzip-v2 gzip-v2.hg
   1 changesets found
   $ f --size gzip-v2.hg
   gzip-v2.hg: size=468
 
   $ hg --config experimental.bundlecomplevel=1 bundle -a -t gzip-v2 gzip-v2-level1.hg
   1 changesets found
   $ f --size gzip-v2-level1.hg
   gzip-v2-level1.hg: size=475
 
   $ hg --config experimental.bundlecomplevel.gzip=1 --config experimental.bundlelevel=9 bundle -a -t gzip-v2 gzip-v2-level1.hg
   1 changesets found
   $ f --size gzip-v2-level1.hg
   gzip-v2-level1.hg: size=475
 
   $ cd ..
 
 #if zstd
 
   $ for t in "zstd" "zstd-v2"; do
   >   testbundle $t
   > done
   % test bundle type zstd
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {Compression: ZS}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   zstd-v2
   
   % test bundle type zstd-v2
   searching for changes
   1 changesets found
   HG20\x00\x00 (esc)
   Stream params: {Compression: ZS}
   changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
       c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
   cache:rev-branch-cache -- {} (mandatory: False)
   zstd-v2
   
 
 Explicit request for zstd on non-generaldelta repos
 
   $ hg --config format.usegeneraldelta=false init nogd
   $ hg -q -R nogd pull t1
   $ hg -R nogd bundle -a -t zstd nogd-zstd
   1 changesets found
 
 zstd-v1 always fails
 
   $ hg -R tzstd bundle -a -t zstd-v1 zstd-v1
   abort: compression engine zstd is not supported on v1 bundles
   (see 'hg help bundlespec' for supported values for --type)
   [10]
 
 zstd supports threading
 
   $ hg init test-compthreads
   $ cd test-compthreads
   $ hg debugbuilddag +3
   $ hg --config experimental.bundlecompthreads=1 bundle -a -t zstd-v2 zstd-v2-threaded.hg
   3 changesets found
   $ cd ..
 
 #else
 
 zstd is a valid engine but isn't available
 
   $ hg -R t1 bundle -a -t zstd irrelevant.hg
   abort: compression engine zstd could not be loaded
   [255]
 
 #endif
 
 test garbage file
 
   $ echo garbage > bgarbage
   $ hg init tgarbage
   $ cd tgarbage
   $ hg pull ../bgarbage
   pulling from ../bgarbage
   abort: ../bgarbage: not a Mercurial bundle
   [255]
   $ cd ..
 
 test invalid bundle type
 
   $ cd t1
   $ hg bundle -a -t garbage ../bgarbage
   abort: garbage is not a recognized bundle specification
   (see 'hg help bundlespec' for supported values for --type)
   [10]
   $ cd ..
+
+Test controlling the changegroup version
+
+  $ hg -R t1 bundle --config experimental.changegroup3=yes -a -t v2 ./v2-cg-default.hg
+  1 changesets found
+  $ hg debugbundle ./v2-cg-default.hg --part-type changegroup
+  Stream params: {Compression: BZ}
+  changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
+      c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
+  $ hg debugbundle ./v2-cg-default.hg --spec
+  bzip2-v2
+  $ hg -R t1 bundle --config experimental.changegroup3=yes -a -t 'v2;cg.version=02' ./v2-cg-02.hg
+  1 changesets found
+  $ hg debugbundle ./v2-cg-02.hg --part-type changegroup
+  Stream params: {Compression: BZ}
+  changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
+      c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
+  $ hg debugbundle ./v2-cg-02.hg --spec
+  bzip2-v2
+  $ hg -R t1 bundle --config experimental.changegroup3=yes -a -t 'v2;cg.version=03' ./v2-cg-03.hg
+  1 changesets found
+  $ hg debugbundle ./v2-cg-03.hg --part-type changegroup
+  Stream params: {Compression: BZ}
+  changegroup -- {nbchanges: 1, version: 03} (mandatory: True)
+      c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
+  $ hg debugbundle ./v2-cg-03.hg --spec
+  abort: changegroup version 03 does not have a known bundlespec (known-bad-output !)
+  (try upgrading your Mercurial client) (known-bad-output !)
+  [255]