util: check for compression engine availability before returning
If a requested compression engine is registered but not available,
requesting it will now abort.
To be honest, I'm not sure if this is the appropriate mechanism
for handling optional compression engines. I won't know until
all uses of compression (bundles, wire protocol, revlogs, etc)
are using the new API and zstd (our planned optional engine)
is implemented. So this API could change.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing:
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.