feat(cli): support multiple borgmatic config paths

Allow --borgmatic-config to be specified multiple times and pass each
configuration path through to borgmatic.

This also removes the hard-coded default configuration path, allowing
borgmatic's own configuration discovery to be used when no explicit
configuration is provided.

1 files changed, 22 insertions, 17 deletions

diff --git a/prometheus_borgmatic_exporter/__init__.py b/prometheus_borgmatic_exporter/__init__.py
index ac2721e..fea8dbd 100644
--- a/prometheus_borgmatic_exporter/__init__.py
+++ b/prometheus_borgmatic_exporter/__init__.py
@@ -284,12 +284,9 @@ def extract_archive_counts(
 
 
 def fetch_repositories(
-    borgmatic_bin: Path,
-    borgmatic_config: Path,
-    all_archives: bool,
+    borgmatic_bin: Path, borgmatic_configs: tuple[Path, ...], all_archives: bool
 ) -> tuple[list[types.BorgInfoReturnType], list[types.ArchiveCount]]:
-    """
-    Fetch repository and archive data from borgmatic.
+    """Fetch repository and archive data from borgmatic.
 
     When all_archives is False, runs `borgmatic info --archive latest` and
     `borgmatic list` in complementary intent: info provides per-repository
@@ -314,7 +311,11 @@ def fetch_repositories(
                           always populated regardless of the all_archives flag.
     """
     verbose("Fetching repositories")
-    borgmatic_cmd = [str(borgmatic_bin), "--config", str(borgmatic_config)]
+    borgmatic_cmd = [str(borgmatic_bin)]
+
+    for config in borgmatic_configs:
+        borgmatic_cmd.extend(["--config", str(config)])
+
     info_command = [*borgmatic_cmd, "info", "--json"]
 
     if all_archives:
@@ -473,14 +474,16 @@ def collect_archive_metrics(
 )
 @click.option(
     "--borgmatic-config",
+    "borgmatic_configs",
+    multiple=True,
     type=click.Path(
-        exists=True,
-        readable=True,
-        dir_okay=False,
-        allow_dash=False,
-        path_type=Path,
+        exists=True, readable=True, dir_okay=True, allow_dash=False, path_type=Path
+    ),
+    help=(
+        "Configuration file or directory. "
+        "Can be specified multiple times. "
+        "If not specified, borgmatic's default configuration discovery is used."
     ),
-    default="/etc/borgmatic/config.yaml",
 )
 @click.option(
     "--textfile-collector-dir",
@@ -510,7 +513,7 @@ def collect_archive_metrics(
 def prometheus_borgmatic_exporter(
     ctx: click.Context,
     borgmatic_bin: Path,
-    borgmatic_config: Path,
+    borgmatic_configs: tuple[Path, ...],
     textfile_collector_dir: Path,
     all_archives_flag: bool,
     quiet_flag: bool,
@@ -537,16 +540,18 @@ def prometheus_borgmatic_exporter(
 
     debug("Effective configuration:")
     debug("  borgmatic_bin:", str(borgmatic_bin))
-    debug("  borgmatic_config:", str(borgmatic_config))
+    debug(
+        "  borgmatic_configs:",
+        ", ".join(str(config) for config in borgmatic_configs)
+        or "<borgmatic defaults>",
+    )
     debug("  textfile_collector_dir:", str(textfile_collector_dir))
     debug("  all_archives:", str(all_archives_flag))
     debug("  verbose:", str(verbose_flag))
     debug("  quiet:", str(quiet_flag))
 
     repositories, archive_counts = fetch_repositories(
-        borgmatic_bin,
-        borgmatic_config,
-        all_archives_flag,
+        borgmatic_bin, borgmatic_configs, all_archives_flag
     )
 
     for repository in archive_counts: