hg: support for auto sharing stores when cloning
Many 3rd party consumers of Mercurial have created wrappers to
essentially perform clone+share as a single operation. This is
especially popular in automated processes like continuous integration
systems. The Jenkins CI software and Mozilla's Firefox release
automation infrastructure have both implemented custom code that
effectively perform clone+share. The common use case here is that
clients want to obtain N>1 checkouts while minimizing disk space and
network requirements. Furthermore, they often don't care that a clone
is an exact mirror of a remote: they are simply looking to obtain
checkouts of specific revisions.
When multiple third parties implement a similar feature, it's a good
sign that the feature is worth adding to the core product. This patch
adds support for an easy-to-use clone+share feature.
The internal "clone" function now accepts options to control auto
sharing during clone. When the auto share mode is active, a store will
be created/updated under the base directory specified and a new
repository pointing to the shared store will be created at the path
specified by the user.
The share extension has grown the ability to pass these options into
the clone command/function.
No command line options for this feature are added because we don't
feel the feature will be popular enough to warrant their existence.
There are two modes for auto share mode. In the default mode, the shared
repo is derived from the first changeset (rev 0) in the remote
repository. This enables related repositories existing at different URLs
to automatically use the same storage. In environments that operate
several repositories (separate repo for branch/head/bookmark or separate
repo per user), this has the potential to drastically reduce storage
and network requirements. In the other mode, the name is derived from the
remote's path/URL.
#require no-msys # MSYS will translate web paths as if they were file paths
This is a test of the push wire protocol over CGI-based hgweb.
initialize repository
$ hg init r
$ cd r
$ echo a > a
$ hg ci -A -m "0"
adding a
$ echo '[web]' > .hg/hgrc
$ echo 'allow_push = *' >> .hg/hgrc
$ echo 'push_ssl = false' >> .hg/hgrc
create hgweb invocation script
$ cat >hgweb.cgi <<HGWEB
> import cgitb
> cgitb.enable()
> from mercurial import demandimport; demandimport.enable()
> from mercurial.hgweb import hgweb
> from mercurial.hgweb import wsgicgi
> application = hgweb('.', 'test repository')
> wsgicgi.launch(application)
> HGWEB
$ chmod 755 hgweb.cgi
test preparation
$ . "$TESTDIR/cgienv"
$ REQUEST_METHOD="POST"; export REQUEST_METHOD
$ CONTENT_TYPE="application/octet-stream"; export CONTENT_TYPE
$ hg bundle --all bundle.hg
1 changesets found
$ CONTENT_LENGTH=279; export CONTENT_LENGTH;
expect failure because heads doesn't match (formerly known as 'unsynced changes')
$ QUERY_STRING="cmd=unbundle&heads=0000000000000000000000000000000000000000"; export QUERY_STRING
$ python hgweb.cgi <bundle.hg >page1 2>&1
$ cat page1
Status: 200 Script output follows\r (esc)
Content-Type: application/mercurial-0.1\r (esc)
Content-Length: 64\r (esc)
\r (esc)
0
repository changed while preparing changes - please try again
successful force push
$ QUERY_STRING="cmd=unbundle&heads=666f726365"; export QUERY_STRING
$ python hgweb.cgi <bundle.hg >page2 2>&1
$ cat page2
Status: 200 Script output follows\r (esc)
Content-Type: application/mercurial-0.1\r (esc)
Content-Length: 102\r (esc)
\r (esc)
1
adding changesets
adding manifests
adding file changes
added 0 changesets with 0 changes to 1 files
successful push, list of heads
$ QUERY_STRING="cmd=unbundle&heads=f7b1eb17ad24730a1651fccd46c43826d1bbc2ac"; export QUERY_STRING
$ python hgweb.cgi <bundle.hg >page3 2>&1
$ cat page3
Status: 200 Script output follows\r (esc)
Content-Type: application/mercurial-0.1\r (esc)
Content-Length: 102\r (esc)
\r (esc)
1
adding changesets
adding manifests
adding file changes
added 0 changesets with 0 changes to 1 files
successful push, SHA1 hash of heads (unbundlehash capability)
$ QUERY_STRING="cmd=unbundle&heads=686173686564 5a785a5f9e0d433b88ed862b206b011b0c3a9d13"; export QUERY_STRING
$ python hgweb.cgi <bundle.hg >page4 2>&1
$ cat page4
Status: 200 Script output follows\r (esc)
Content-Type: application/mercurial-0.1\r (esc)
Content-Length: 102\r (esc)
\r (esc)
1
adding changesets
adding manifests
adding file changes
added 0 changesets with 0 changes to 1 files
$ cd ..