1 files changed, 66 insertions, 4 deletions
diff --git a/include/docker.h b/include/docker.h
index 03f5d0d..3c7dff6 100644
--- a/include/docker.h
+++ b/include/docker.h
@@ -1,20 +1,82 @@
+//! @file docker.h
 #ifndef OMC_DOCKER_H
 #define OMC_DOCKER_H
 
+//! Flag to squelch output from docker_exec()
 #define OMC_DOCKER_QUIET 1 << 1
 
+//! Flag for older style docker build
 #define OMC_DOCKER_BUILD 1 << 1
+//! Flag for docker buildx
 #define OMC_DOCKER_BUILD_X 1 << 2
 
 struct DockerCapabilities {
-    int podman;
-    int build;
-    int available;
-    int usable;
+    int podman;  //!< Is "docker" really podman?
+    int build;  //!< Is a build plugin available?
+    int available;  //!< Is a "docker" program available?
+    int usable;  //!< Is docker in a usable state for the current user?
 };
 
+/**
+ * Determine the state of docker on the system
+ *
+ * ```c
+ * struct DockerCapabilities docker_is;
+ * if (!docker_capable(&docker_is)) {
+ *     fprintf(stderr, "%s is %savailable, and %susable\n",
+ *         docker_is.podman ? "Podman" : "Docker",
+ *         docker_is.available ? "" : "not ",
+ *         docker_is.usable ? "" : "not ");
+ *     exit(1);
+ * }
+ * ```
+ *
+ * @param result DockerCapabilities struct
+ * @return 1 on success, 0 on error
+ */
 int docker_capable(struct DockerCapabilities *result);
+
+/**
+ * Execute a docker command
+ *
+ * Use the `OMC_DOCKER_QUIET` flag to suppress all output from stdout and stderr.
+ *
+ * ```c
+ * if (docker_exec("run --rm -t ubuntu:latest /bin/bash -c 'echo Hello world'", 0)) {
+ *     fprintf(stderr, "Docker hello world failed\n");
+ *     exit(1);
+ * }
+ * ```
+ *
+ * @param args arguments to pass to docker
+ * @param flags
+ * @return exit code from "docker"
+ */
 int docker_exec(const char *args, unsigned flags);
+
+/**
+ * Build a docker image
+ *
+ * ```c
+ * struct DockerCapabilities docker_is;
+ * docker_capable(&docker_is);
+ *
+ * if (docker_is.usable) {
+ *     printf("Building docker image\n");
+ *     if (docker_build("path/to/Dockerfile/dir")) {
+ *         fprintf("Docker build failed\n");
+ *         exit(1);
+ *     }
+ * } else {
+ *     fprintf(stderr, "No usable docker installation available\n");
+ * }
+ * ```
+ *
+ * @param dirpath
+ * @param args
+ * @param engine
+ * @return
+ */
 int docker_build(const char *dirpath, const char *args, int engine);
 int docker_script(const char *image, char *data, unsigned flags);
 int docker_save(const char *image, const char *destdir);