折腾：
【未解决】gitbook安装和使用插件autocover给生成的pdf文件加上封面
期间，运行：
==> Downloading https://homebrew.bintray.com/bottles/libusb-1.0.24.mojave.bottle.tar.gz ################### 27.1%^C ✘ xxx@xxx ~/dev/crifan/gitbook/gitbook_template/books/gitbook_demo master ● brew install pkg-config cairo pango libpng jpeg giflib librsvg
结果：
Error: homebrew-core is a shallow clone. homebrew-cask is a shallow clone. To `brew update`, first run: git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow These commands may take a few minutes to run due to the large size of the repositories. This restriction has been made on GitHub's request because updating shallow clones is an extremely expensive operation due to the tree layout and traffic of Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you automatically to avoid repeatedly performing an expensive unshallow operation in CI systems (which should instead be fixed to not use shallow clones). Sorry for the inconvenience! Warning: pkg-config 0.29.2_3 is already installed and up-to-date To reinstall 0.29.2_3, run `brew reinstall pkg-config` Warning: cairo 1.16.0_4 is already installed and up-to-date To reinstall 1.16.0_4, run `brew reinstall cairo` Warning: pango 1.48.0 is already installed and up-to-date To reinstall 1.48.0, run `brew reinstall pango` Warning: libpng 1.6.37 is already installed and up-to-date To reinstall 1.6.37, run `brew reinstall libpng` Warning: jpeg 9d is already installed and up-to-date To reinstall 9d, run `brew reinstall jpeg` Warning: giflib 5.2.1 is already installed and up-to-date To reinstall 5.2.1, run `brew reinstall giflib` Warning: librsvg 2.50.2 is already installed and up-to-date To reinstall 2.50.2, run `brew reinstall librsvg`
然后：
brew upgrade jpeg Error: homebrew-core is a shallow clone. homebrew-cask is a shallow clone. To `brew update`, first run: git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow These commands may take a few minutes to run due to the large size of the repositories. This restriction has been made on GitHub's request because updating shallow clones is an extremely expensive operation due to the tree layout and traffic of Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you automatically to avoid repeatedly performing an expensive unshallow operation in CI systems (which should instead be fixed to not use shallow clones). Sorry for the inconvenience! Warning: jpeg 9d already installed
同样报错。
运行：
git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
好像卡死了？
还是去解决：
mac error homebrew-core is a shallow clone
git -C "/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask" fetch --unshallow
好像就是说要：
git -C "/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core" fetch —unshallow git -C "/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask" fetch --unshallow
有进展和输出了
git -C "/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask" fetch --unshallow remote: Enumerating objects: 52773, done. remote: Counting objects: 100% (51190/51190), done. remote: Compressing objects: 100% (16634/16634), done. Receiving objects: 100% (46482/46482), 22.69 MiB | 219.00 KiB/s, done. remote: Total 46482 (delta 34054), reused 42238 (delta 29839), pack-reused 0 Resolving deltas: 100% (34054/34054), completed with 2076 local objects.
结束了。
再去试试：
brew upgrade jpeg Error: homebrew-core is a shallow clone. To `brew update`, first run: git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow This command may take a few minutes to run due to the large size of the repository. This restriction has been made on GitHub's request because updating shallow clones is an extremely expensive operation due to the tree layout and traffic of Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you automatically to avoid repeatedly performing an expensive unshallow operation in CI systems (which should instead be fixed to not use shallow clones). Sorry for the inconvenience! Warning: jpeg 9d already installed
继续：
git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
等了好一会终于有进展了：
和：
最后失败了：
git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow remote: Enumerating objects: 654563, done. remote: Counting objects: 100% (654515/654515), done. remote: Compressing objects: 100% (223842/223842), done. error: RPC failed; curl 18 transfer closed with outstanding read data remaining fatal: the remote end hung up unexpectedly fatal: early EOF fatal: index-pack failed
再试试：
git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow remote: Enumerating objects: 654563, done. remote: Counting objects: 100% (654515/654515), done. remote: Compressing objects: 100% (223842/223842), done. Receiving objects: 100% (645411/645411), 259.16 MiB | 208.00 KiB/s, done. remote: Total 645411 (delta 424275), reused 639847 (delta 418716), pack-reused 0 Resolving deltas: 100% (424275/424275), completed with 4087 local objects. From https://github.com/Homebrew/homebrew-core c3ee68e133..459f19f1a0 master -> origin/master
等了1个多小时，终于结束了。
后续：
brew upgrade jpeg Updating Homebrew... ==> Auto-updated Homebrew! Updated 1 tap (homebrew/core). ==> Updated Formulae Updated 3 formulae. Warning: jpeg 9d already installed
就正常了。
【总结】
此处之前由于一些原因，导致brew报错：
Error: homebrew-core is a shallow clone. homebrew-cask is a shallow clone. To `brew update`, first run: git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow These commands may take a few minutes to run due to the large size of the repositories. This restriction has been made on GitHub's request because updating shallow clones is an extremely expensive operation due to the tree layout and traffic of Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you automatically to avoid repeatedly performing an expensive unshallow operation in CI systems (which should instead be fixed to not use shallow clones). Sorry for the inconvenience!
解决办法：
git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch —unshallow git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
即可。
注：
1.需要等待足够长时间，才可以。
2.如果速度慢，可以考虑加代理，比如：
export ALL_PROXY=socks5://127.0.0.1:51837
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