#!/bin/bash
# gitea-admin-wrapper.sh — reads the ESO-mounted gitea-admin token at exec time
# and prefixes it as a transient env var to the underlying tool.
#
# M22 Phase 9: token mounted at /run/agent/secrets/gitea-admin/token (read-only,
# tmpfs, mode 0400). The token NEVER enters the wrapper's parent shell — only
# the exec'd tool's environment via `exec env VAR=value cmd`. The brief
# presence in /proc/<tool_pid>/environ of the tool process is the accepted
# floor (per spec/secrets-runtime.md SR-DISP-7 / H-SECRET-4).
set -euo pipefail

TOKEN_FILE="/run/agent/secrets/gitea-admin/token"

# git-credential-helper subcommand: read token and emit git credential format.
# Git invokes us as `gitea-admin-wrapper.sh git-credential-helper get` and
# expects key=value lines on stdout terminated by a blank line.
git_credential_helper() {
    if [[ ! -r "$TOKEN_FILE" ]]; then
        echo "gitea-admin-wrapper: token file not readable at $TOKEN_FILE" >&2
        exit 1
    fi
    local base_url="${GITEA_BASE_URL:-https://gitea.oreillyit.nz}"
    local host
    host=$(echo "$base_url" | sed 's|https\?://||')
    # Trailing blank line per git credential-helper protocol.
    printf 'protocol=https\nhost=%s\nusername=git\npassword=%s\n\n' "$host" "$(cat "$TOKEN_FILE")"
    exit 0
}

case "${1:-}" in
    git-credential-helper)
        git_credential_helper
        ;;
    *)
        if [[ ! -r "$TOKEN_FILE" ]]; then
            echo "gitea-admin-wrapper: token file not readable at $TOKEN_FILE" >&2
            exit 1
        fi
        # `exec env VAR=...` keeps the secret out of the wrapper's parent shell
        # — it lands only in the exec'd tool's /proc/<pid>/environ. NEVER use
        # `export VAR=` here, which would leak the secret to the wrapper's
        # ancestors (H-SECRET-4 violation).
        exec env GITEA_ADMIN_TOKEN="$(cat "$TOKEN_FILE")" "$@"
        ;;
esac