tvl-depot/docs/designs/SPARSE_CHECKOUTS.md at 534a2f95f86f3b0340040261ffc428d604210512

Vincent Ambo f520bd40ca refactor: Replace 'depotPath' with 'depot.path'

Instead of having two ways of accessing the path to the depot (one of
which was stuttering, depot.depotPath) we settle on only one:
depot.path.

This was mostly used for NixOS module imports.

Co-Authored-By: Florian Klink <flokli@flokli.de>
Change-Id: I2c0db23383fc34f6ca76baaad4cc4af2d9dfae15
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2962
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>

2021-04-12 21:55:07 +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="${depot.path}"
XDG_DATA_HOME="${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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