#!/bin/bash
# gitea-https init — stage the token for the agent user and configure the
# git credential helper to read from the staged copy.
#
# Threat model: keep the ESO mount root-only (mode 0400). init.sh runs as
# root and `install`s a per-secret 0600 agent-owned copy at
# $AGENT_HOME/.config/git/gitea-https-token. The git credential helper
# reads from the staged copy at every git invocation; the ESO mount path
# is never accessed by the agent.
#
# This was previously a `cat /run/agent/secrets/gitea-https/token` from
# inside an init.sh-generated helper script, which silently failed because
# the helper runs as agent and the ESO file is root:root mode 0400. The
# stage-and-helper-points-at-stage pattern matches gitea-ssh / minimax /
# z-ai / anthropic-cloud-paul-oauth.
#
# Rotation handling: per-container init. Ephemeral container agents
# always pick up the latest mounted token. Long-running sessions need a
# future scripts.control_loop hook to re-stage between git invocations.

set -euo pipefail

ESO_TOKEN="/run/agent/secrets/gitea-https/token"

if [ ! -r "$ESO_TOKEN" ]; then
    echo "ERROR: $ESO_TOKEN not readable. Check ESO ExternalSecret acct-<gitea-https-id>." >&2
    exit 1
fi

AGENT_USER="${AGENT_USER:-agent}"
AGENT_HOME=$(getent passwd "$AGENT_USER" | cut -d: -f6)
if [ -z "$AGENT_HOME" ] || [ ! -d "$AGENT_HOME" ]; then
    AGENT_HOME="/home/$AGENT_USER"
fi

# Stage the token into a per-secret path owned by agent, mode 0600.
STAGED_DIR="$AGENT_HOME/.config/git"
STAGED_TOKEN="$STAGED_DIR/gitea-https-token"
mkdir -p "$STAGED_DIR"
chown "$AGENT_USER:" "$STAGED_DIR" 2>/dev/null || true
chmod 0700 "$STAGED_DIR"
install -m 0600 -o "$AGENT_USER" -g "$AGENT_USER" "$ESO_TOKEN" "$STAGED_TOKEN"

# Generate the credential helper. It reads from the STAGED copy, not the
# ESO mount, so it works under the agent's UID.
CRED_HELPER="/opt/harness/contexts/gitea-https/v1/git-credential-gitea.sh"
cat > "$CRED_HELPER" <<HELPER_EOF
#!/bin/bash
# Git credential helper for gitea.oreillyit.nz — reads the agent-staged
# token. The ESO mount itself is root-only (0400); this helper would fail
# if pointed at it directly.
set -euo pipefail
TOKEN_FILE=$STAGED_TOKEN
[ -r "\$TOKEN_FILE" ] || exit 1
echo "protocol=https"
echo "host=gitea.oreillyit.nz"
echo "username=token"
echo "password=\$(cat "\$TOKEN_FILE")"
HELPER_EOF

chmod +x "$CRED_HELPER"

# Configure git globally (per-host) to use the helper for gitea.oreillyit.nz.
# Run as agent so ~/.gitconfig is owned correctly; otherwise root would
# write into /root/.gitconfig and the agent's git wouldn't see it.
su - "$AGENT_USER" -c "git config --global credential.https://gitea.oreillyit.nz.helper '$CRED_HELPER'"

echo "gitea-https: token staged at $STAGED_TOKEN (0600 $AGENT_USER:$AGENT_USER)"
echo "gitea-https: credential helper configured for gitea.oreillyit.nz"