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GitDownloadStrategy optimization

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The current series of fetch invocations in GitDownloadStrategy has the
unfortunate behavior of fetching full history even in shallow clones
that only need the history between the clone point and the remote HEAD.
It should be possible to determine if it is actually necessary to fetch
the full history, including all tags, and if it is not to avoid this
overhead.

Fixes Homebrew/homebrew#11958, and several other recurring problems.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
This commit is contained in:
Jack Nagel 2012-04-23 20:21:12 -05:00
parent b1d490cbed
commit b8715f6d97
1 changed files with 27 additions and 16 deletions
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43
Library/Homebrew/download_strategy.rb
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@ -324,14 +324,10 @@ class GitDownloadStrategy < AbstractDownloadStrategy
end
def support_depth?
!commit_history_required? and depth_supported_host?
@spec != :revision and host_supports_depth?
end
def commit_history_required?
@spec == :sha
end
def depth_supported_host?
def host_supports_depth?
@url =~ %r(git://) or @url =~ %r(https://github.com/)
end
@ -352,16 +348,31 @@ class GitDownloadStrategy < AbstractDownloadStrategy
unless @clone.exist?
# Note: first-time checkouts are always done verbosely
git_args = %w(git clone)
git_args << "--depth" << "1" if support_depth?
git_args << @url << @clone
safe_system(*git_args)
clone_args = %w[git clone]
clone_args << '--single-branch'
clone_args << '--depth' << '1' if support_depth?
case @spec
when :branch, :tag
clone_args << '--branch' << @ref
end
clone_args << @url << @clone
safe_system(*clone_args)
else
puts "Updating #{@clone}"
Dir.chdir(@clone) do
safe_system 'git', 'remote', 'set-url', 'origin', @url
quiet_safe_system 'git', 'fetch', 'origin'
quiet_safe_system 'git', 'fetch', '--tags' if @spec == :tag
safe_system 'git', 'config', 'remote.origin.url', @url
safe_system 'git', 'config', 'remote.origin.fetch', case @spec
when :branch then "+refs/heads/#{@ref}:refs/remotes/origin/#{@ref}"
when :tag then "+refs/tags/#{@ref}:refs/tags/#{@ref}"
else '+refs/heads/master:refs/remotes/origin/master'
end
git_args = %w[git fetch origin]
git_args << '--depth' << '1' if support_depth?
quiet_safe_system(*git_args)
end
end
end
@ -373,9 +384,9 @@ class GitDownloadStrategy < AbstractDownloadStrategy
ohai "Checking out #{@spec} #{@ref}"
case @spec
when :branch
nostdout { quiet_safe_system 'git', 'checkout', "origin/#{@ref}" }
when :tag, :sha
nostdout { quiet_safe_system 'git', 'checkout', @ref }
nostdout { quiet_safe_system 'git', 'checkout', "origin/#{@ref}", '--' }
when :tag, :revision
nostdout { quiet_safe_system 'git', 'checkout', @ref, '--' }
end
else
# otherwise the checkout-index won't checkout HEAD