add some more code

This adds a basic "worker" program.

You can now do something like

    ./server &
    ./worker &
    ./client ci_run URL REV

and the server should pass a message to worker, after which it should
clone the repository at URL, checkout REV, and try to run the CI script.

It's extremely unfinished: I need to sort out the graceful shutdown, how
the server manages workers, etc.

1 files changed, 61 insertions, 0 deletions

diff --git a/src/file.c b/src/file.c
new file mode 100644
index 0000000..ede640b
--- /dev/null
+++ b/src/file.c
@@ -0,0 +1,61 @@
+#include "file.h"
+#include "log.h"
+
+#include <ftw.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+static int unlink_cb(const char *fpath, const struct stat *, int, struct FTW *)
+{
+	int ret = 0;
+
+	ret = remove(fpath);
+	if (ret < 0) {
+		print_errno("remove");
+		return ret;
+	}
+
+	return ret;
+}
+
+int rm_rf(const char *dir)
+{
+	print_log("Recursively removing directory: %s\n", dir);
+	return nftw(dir, unlink_cb, 64, FTW_DEPTH | FTW_PHYS);
+}
+
+int my_chdir(const char *dir, char **old)
+{
+	int ret = 0;
+
+	if (old) {
+		*old = get_current_dir_name();
+		if (!*old) {
+			print_errno("get_current_dir_name");
+			return -1;
+		}
+	}
+
+	ret = chdir(dir);
+	if (ret < 0) {
+		print_errno("chdir");
+		goto free_old;
+	}
+
+	return ret;
+
+free_old:
+	if (old)
+		free(*old);
+
+	return ret;
+}
+
+int file_exists(const char *path)
+{
+	struct stat stat;
+	int ret = lstat(path, &stat);
+	return !ret && S_ISREG(stat.st_mode);
+}