git clone --filter da Git 2.19
Questa opzione salterà effettivamente il recupero della maggior parte degli oggetti non necessari dal server:
git clone --depth 1 --no-checkout --filter=blob:none \
"file://$(pwd)/server_repo" local_repo
cd local_repo
git checkout master -- mydir/myfile
Il server deve essere configurato con:
git config --local uploadpack.allowfilter 1
git config --local uploadpack.allowanysha1inwant 1
Non esiste alcun supporto server dalla v2.19.0, ma può già essere testato localmente.
TODO: --filter=blob:nonesalta tutti i BLOB, ma recupera comunque tutti gli oggetti dell'albero. Ma su un normale repository, questo dovrebbe essere minuscolo rispetto ai file stessi, quindi questo è già abbastanza buono. Alla domanda: https://www.spinics.net/lists/git/msg342006.html Gli sviluppatori hanno risposto che --filter=tree:0è in lavorazione per farlo.
Ricorda che --depth 1implica già --single-branch, vedi anche: /programming/1778088/how-to-clone-a-single-branch-in-git
file://$(path)è necessario per superare i git cloneprotocolli shenanigans: /programming/47307578/how-to-shallow-clone-a-local-git-repository-with-a-relative-path
Il formato di --filterè documentato su man git-rev-list.
È stata creata un'estensione al protocollo remoto Git per supportare questa funzione.
Documenti sull'albero Git:
Vedi anche: /programming/2466735/how-to-checkout-only-one-file-from-git-repository-sparse-checkout
Provalo
#!/usr/bin/env bash
set -eu
list-objects() (
git rev-list --all --objects
echo "master commit SHA: $(git log -1 --format="%H")"
echo "mybranch commit SHA: $(git log -1 --format="%H")"
git ls-tree master
git ls-tree mybranch | grep mybranch
git ls-tree master~ | grep root
)
# Reproducibility.
export GIT_COMMITTER_NAME='a'
export GIT_COMMITTER_EMAIL='a'
export GIT_AUTHOR_NAME='a'
export GIT_AUTHOR_EMAIL='a'
export GIT_COMMITTER_DATE='2000-01-01T00:00:00+0000'
export GIT_AUTHOR_DATE='2000-01-01T00:00:00+0000'
rm -rf server_repo local_repo
mkdir server_repo
cd server_repo
# Create repo.
git init --quiet
git config --local uploadpack.allowfilter 1
git config --local uploadpack.allowanysha1inwant 1
# First commit.
# Directories present in all branches.
mkdir d1 d2
printf 'd1/a' > ./d1/a
printf 'd1/b' > ./d1/b
printf 'd2/a' > ./d2/a
printf 'd2/b' > ./d2/b
# Present only in root.
mkdir 'root'
printf 'root' > ./root/root
git add .
git commit -m 'root' --quiet
# Second commit only on master.
git rm --quiet -r ./root
mkdir 'master'
printf 'master' > ./master/master
git add .
git commit -m 'master commit' --quiet
# Second commit only on mybranch.
git checkout -b mybranch --quiet master~
git rm --quiet -r ./root
mkdir 'mybranch'
printf 'mybranch' > ./mybranch/mybranch
git add .
git commit -m 'mybranch commit' --quiet
echo "# List and identify all objects"
list-objects
echo
# Restore master.
git checkout --quiet master
cd ..
# Clone. Don't checkout for now, only .git/ dir.
git clone --depth 1 --quiet --no-checkout --filter=blob:none "file://$(pwd)/server_repo" local_repo
cd local_repo
# List missing objects from master.
echo "# Missing objects after --no-checkout"
git rev-list --all --quiet --objects --missing=print
echo
echo "# Git checkout fails without internet"
mv ../server_repo ../server_repo.off
! git checkout master
echo
echo "# Git checkout fetches the missing file from internet"
mv ../server_repo.off ../server_repo
git checkout master -- d1/a
echo
echo "# Missing objects after checking out d1/a"
git rev-list --all --quiet --objects --missing=print
GitHub a monte .
Uscita in Git v2.19.0:
# List and identify all objects
c6fcdfaf2b1462f809aecdad83a186eeec00f9c1
fc5e97944480982cfc180a6d6634699921ee63ec
7251a83be9a03161acde7b71a8fda9be19f47128
62d67bce3c672fe2b9065f372726a11e57bade7e
b64bf435a3e54c5208a1b70b7bcb0fc627463a75 d1
308150e8fddde043f3dbbb8573abb6af1df96e63 d1/a
f70a17f51b7b30fec48a32e4f19ac15e261fd1a4 d1/b
84de03c312dc741d0f2a66df7b2f168d823e122a d2
0975df9b39e23c15f63db194df7f45c76528bccb d2/a
41484c13520fcbb6e7243a26fdb1fc9405c08520 d2/b
7d5230379e4652f1b1da7ed1e78e0b8253e03ba3 master
8b25206ff90e9432f6f1a8600f87a7bd695a24af master/master
ef29f15c9a7c5417944cc09711b6a9ee51b01d89
19f7a4ca4a038aff89d803f017f76d2b66063043 mybranch
1b671b190e293aa091239b8b5e8c149411d00523 mybranch/mybranch
c3760bb1a0ece87cdbaf9a563c77a45e30a4e30e
a0234da53ec608b54813b4271fbf00ba5318b99f root
93ca1422a8da0a9effc465eccbcb17e23015542d root/root
master commit SHA: fc5e97944480982cfc180a6d6634699921ee63ec
mybranch commit SHA: fc5e97944480982cfc180a6d6634699921ee63ec
040000 tree b64bf435a3e54c5208a1b70b7bcb0fc627463a75 d1
040000 tree 84de03c312dc741d0f2a66df7b2f168d823e122a d2
040000 tree 7d5230379e4652f1b1da7ed1e78e0b8253e03ba3 master
040000 tree 19f7a4ca4a038aff89d803f017f76d2b66063043 mybranch
040000 tree a0234da53ec608b54813b4271fbf00ba5318b99f root
# Missing objects after --no-checkout
?f70a17f51b7b30fec48a32e4f19ac15e261fd1a4
?8b25206ff90e9432f6f1a8600f87a7bd695a24af
?41484c13520fcbb6e7243a26fdb1fc9405c08520
?0975df9b39e23c15f63db194df7f45c76528bccb
?308150e8fddde043f3dbbb8573abb6af1df96e63
# Git checkout fails without internet
fatal: '/home/ciro/bak/git/test-git-web-interface/other-test-repos/partial-clone.tmp/server_repo' does not appear to be a git repository
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
# Git checkout fetches the missing directory from internet
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (1/1), 45 bytes | 45.00 KiB/s, done.
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (1/1), 45 bytes | 45.00 KiB/s, done.
# Missing objects after checking out d1
?f70a17f51b7b30fec48a32e4f19ac15e261fd1a4
?8b25206ff90e9432f6f1a8600f87a7bd695a24af
?41484c13520fcbb6e7243a26fdb1fc9405c08520
?0975df9b39e23c15f63db194df7f45c76528bccb
Conclusioni: d1/amancano tutti i BLOB tranne quelli. Ad esempio f70a17f51b7b30fec48a32e4f19ac15e261fd1a4, che è d1/b, non è lì dopo il check out d1/.
Si noti che root/roote mybranch/mybranchmancano anche, ma lo --depth 1nasconde dall'elenco dei file mancanti. Se rimuovi --depth 1, verranno visualizzati nell'elenco dei file mancanti.