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cmd/fetch: --retry with exponential backoff.

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See discussion at Homebrew/homebrew-test-bot#826.
This commit is contained in:
Carlo Cabrera 2022-09-06 01:25:34 +08:00
parent 9cfa3d9f2a
commit 360052af57
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GPG Key ID: C74D447FC549A1D0
1 changed files with 14 additions and 4 deletions
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18
Library/Homebrew/cmd/fetch.rb
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@ -13,6 +13,8 @@ module Homebrew
module_function
FETCH_MAX_TRIES = 5
sig { returns(CLI::Parser) }
def fetch_args
Homebrew::CLI::Parser.new do
@ -31,7 +33,8 @@ module Homebrew
"seeing if an existing VCS cache has been updated."
switch "--retry",
description: "Retry if downloading fails or re-download if the checksum of a previously cached " \
"version no longer matches."
"version no longer matches. Tries at most #{FETCH_MAX_TRIES} times with " \
"exponential backoff."
switch "--deps",
description: "Also download dependencies for any listed <formula>."
switch "-s", "--build-from-source",
@ -159,10 +162,17 @@ module Homebrew
end
def retry_fetch?(f, args:)
@fetch_failed ||= Set.new
if args.retry? && @fetch_failed.add?(f)
ohai "Retrying download"
@fetch_failed ||= Hash.new { |h, k| h[k] = 1 }
if args.retry? && (@fetch_failed[f] < FETCH_MAX_TRIES)
wait = 2 ** @fetch_failed[f]
remaining = FETCH_MAX_TRIES - @fetch_failed[f]
what = "try".pluralize(remaining)
ohai "Retrying download in #{wait}s... (#{remaining} #{what} left)"
sleep wait
f.clear_cache
@fetch_failed[f] += 1
true
else
Homebrew.failed = true