Files
stack/adapters/pi/adapter.sh
T
jason.woltje 88d9cf750f feat(sessions): sessionForkFrom - branch conversations from a common ancestor (#33)
- task schema: optional sessionForkFrom (source session name); requires
  session target; self-fork rejected
- runner: resolves source newest .jsonl (fail 4 if none/outside dataRoot);
  passes MOSAIC_SESSION_FORK + MOSAIC_SESSION_DIR; result records lineage
- pi adapter: --fork <source> --session-dir <target> when forking;
  ephemeral default unchanged; plain session resume unchanged
- compose passthrough; RELEASE -> 0.0.7 (adapter changed)
- suite +9 cases (58 total): plumbing via mock stderr, validation
  negatives, live fork - child recalls ancestor code word, ancestor
  session file untouched

Closes #33
2026-09-03 06:43:02 -05:00

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#!/bin/sh
# Pi adapter: implements the Mosaic adapter contract for the pinned
# @earendil-works/pi-coding-agent CLI.
#
# Contract: see /opt/mosaic/adapters/README.md. stdout = response only.
set -eu
[ -n "${MOSAIC_SYSTEM_PROMPT_FILE:-}" ] || { echo "pi adapter: MOSAIC_SYSTEM_PROMPT_FILE is required" >&2; exit 2; }
[ -n "${MOSAIC_REQUEST:-}" ] || { echo "pi adapter: MOSAIC_REQUEST is required" >&2; exit 2; }
[ -r "$MOSAIC_SYSTEM_PROMPT_FILE" ] || { echo "pi adapter: system prompt not readable: $MOSAIC_SYSTEM_PROMPT_FILE" >&2; exit 2; }
: "${PI_PROVIDER:?pi adapter: PI_PROVIDER is required}"
: "${PI_MODEL:?pi adapter: PI_MODEL is required}"
# Workspace (M5): run inside the provided workspace when present.
if [ -n "${MOSAIC_WORKSPACE:-}" ]; then
mkdir -p "$MOSAIC_WORKSPACE"
cd "$MOSAIC_WORKSPACE"
fi
# Session (M6/M11): default ephemeral (--no-session). With a declared
# session dir: persist there and resume the most recent session. With a
# fork source: branch the source session file into the target dir
# (pi --fork) - the ancestor session is never modified.
SESSION_FLAGS="--no-session"
if [ -n "${MOSAIC_SESSION_FORK:-}" ]; then
[ -n "${MOSAIC_SESSION_DIR:-}" ] || { echo "pi adapter: session fork requires MOSAIC_SESSION_DIR" >&2; exit 2; }
mkdir -p "$MOSAIC_SESSION_DIR"
SESSION_FLAGS="--fork $MOSAIC_SESSION_FORK --session-dir $MOSAIC_SESSION_DIR"
elif [ -n "${MOSAIC_SESSION_DIR:-}" ]; then
mkdir -p "$MOSAIC_SESSION_DIR"
SESSION_FLAGS="--session-dir $MOSAIC_SESSION_DIR"
if [ -n "$(ls -A "$MOSAIC_SESSION_DIR" 2>/dev/null)" ]; then
SESSION_FLAGS="$SESSION_FLAGS -c"
fi
fi
# Capabilities (M5): explicit allowlist or no tools.
TOOLS_FLAG="--no-tools"
[ -n "${MOSAIC_TOOLS:-}" ] && TOOLS_FLAG="--tools $MOSAIC_TOOLS"
# All flags documented in the pi package README (CLI Reference):
# -p/--print noninteractive: print the response and exit
# --system-prompt replace the default prompt with the generated one
# --no-* no ambient context/skills/extensions/templates/themes
# --no-session ephemeral; TOOLS_FLAG per capabilities
# --offline no startup network operations (update checks/telemetry)
exec pi \
--offline \
--no-extensions \
--no-skills \
--no-prompt-templates \
--no-themes \
--no-context-files \
$TOOLS_FLAG \
$SESSION_FLAGS \
--provider "$PI_PROVIDER" \
--model "$PI_MODEL" \
--system-prompt "$(cat "$MOSAIC_SYSTEM_PROMPT_FILE")" \
-p "$MOSAIC_REQUEST"