only fetch the latest git revision

[divinity76]

if you don't want the entire revision history of git, but only the latest revision, this speeds up the cloning process/bandwidth/diskspace

• on my laptop, this took the cloning process down from 83.5 seconds to 6.4 seconds (that's a reduction of 92% !), and diskspace requirements down from 230 MB to 59 MB (a reduction of 74% !)

root@xDevAd:/temp2/test# time git clone --depth 1 --shallow-submodules git://github.com/git/git Cloning into 'git'... remote: Enumerating objects: 4080, done. remote: Counting objects: 100% (4080/4080), done. remote: Compressing objects: 100% (3599/3599), done. remote: Total 4080 (delta 379), reused 1931 (delta 311), pack-reused 0 Receiving objects: 100% (4080/4080), 9.83 MiB | 3.69 MiB/s, done. Resolving deltas: 100% (379/379), done.

real 0m6,418s user 0m1,194s sys 0m0,786s root@xDevAd:/temp2/test# mv git git_shallow root@xDevAd:/temp2/test# time git clone git://github.com/git/git Cloning into 'git'... remote: Enumerating objects: 314519, done. remote: Counting objects: 100% (1619/1619), done. remote: Compressing objects: 100% (818/818), done. remote: Total 314519 (delta 1054), reused 1188 (delta 801), pack-reused 312900 Receiving objects: 100% (314519/314519), 172.30 MiB | 3.26 MiB/s, done. Resolving deltas: 100% (234622/234622), done. Updating files: 100% (3982/3982), done.

real 1m23,581s user 1m4,861s sys 0m19,944s root@xDevAd:/temp2/test# du -h git_shallow | tail -n1 59M git_shallow root@xDevAd:/temp2/test# du -h git | tail -n1 230M git