tvl-depot/docs/designs/SPARSE_CHECKOUTS.md at 8eb7c6a5156787c8d8cdc6e03269faa2be60c7b3

Kane York cc01059d40 docs(sparse): Add RFC design for depot worktree tool

This is meant to be a high-velocity alternative to writing an entire
FUSE filesystem to facilitate smaller checkouts of the depot.

The script mostly works today, except that remote dependency detection is not set up.

Change-Id: Idf9048df4f7ee39eaaedcdafcd9621f3d7479947
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1644
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: tazjin <mail@tazj.in>

2020-08-08 10:11:27 +00:00

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Below is a prototype for a script to create Git sparse checkouts of the depot. The script below works today with relatively recent versions of git.

Open items:

Read-increment-write the checkout ID from a file in .git.
NICE_CHECKOUT_ROOT should be a git configuration value.
tvl-get-depends will be a script that contacts the build farm and asks for the closure of a given source directory, using depot-scan.

DEPOT_ROOT="${depot.depotPath}"
XDG_DATA_HOME="${XDG_DATA_HOME:-$HOME/.local/share}"
CLIENT_ROOT="$XDG_DATA_HOME/tvlc/clients"
NICE_CHECKOUT_ROOT="$HOME/tvlc"
CHECKOUT_ID=1
CHECKOUT_NAME=myclient # command line variables

assertAbsolutePath "$CLIENT_ROOT"

mkdir "$CLIENT_ROOT"/"$CHECKOUT_ID"
ln -s "$CLIENT_ROOT"/"$CHECKOUT_ID" "$NICE_CHECKOUT_ROOT"/"$CHECKOUT_NAME"

cd "$DEPOT_ROOT"
git worktree add --no-checkout -b "tvlc-$CHECKOUT_ID" "$CLIENT_ROOT/$CHECKOUT_ID/" canon
# BUG: git not creating the /info/ subdir
mkdir "$DEPOT_ROOT"/.git/worktrees/"$CHECKOUT_ID"/info

cd "$CLIENT_ROOT/$CHECKOUT_ID"
git sparse-checkout init --cone
git sparse-checkout set "$TARGET_DIR" nix/readTree overrides
tvl-get-depends "$TARGET_DIR" | xargs git sparse-checkout add

cd "$NICE_CHECKOUT_ROOT"/"$CHECKOUT_NAME"

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