From 0f3997d6ff2d25c0941824ec3daa3c8e767bd73e Mon Sep 17 00:00:00 2001
From: Aargh Rai <aargh.rai+git@gmail.com>
Date: Tue, 20 Oct 2026 11:20:15 +0530
Subject: wrote the entire thing using libgit2

---
 src/tmp_repo.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/tmp_repo.c

(limited to 'src/tmp_repo.c')

diff --git a/src/tmp_repo.c b/src/tmp_repo.c
new file mode 100644
index 0000000..ff4536c
--- /dev/null
+++ b/src/tmp_repo.c
@@ -0,0 +1,72 @@
+#include <unistd.h>
+#include <sys/random.h>
+#include <sys/wait.h>
+#include <assert.h>
+#include <string.h>
+
+#include "lib.h"
+
+struct tmp_repo tmp_repo_init() {
+  unsigned char rng_bytes[64];
+  assert(getrandom(rng_bytes, sizeof(rng_bytes), 0) == sizeof(rng_bytes));
+
+  char repo_path[70] = "/tmp/";
+  for (int i = 0; i < 64; i++) {
+    repo_path[5 + i] = (char)('a' + rng_bytes[i] % 26);
+  }
+  repo_path[69] = '\0';
+
+  git_libgit2_init();
+
+  git_repository *repo = NULL;
+  assert(git_repository_init(&repo, repo_path, 0) == 0);
+  struct tmp_repo output;
+  memcpy(output.path, repo_path, 70);
+  output.repo = repo;
+  return output;
+}
+
+void tmp_repo_deinit(struct tmp_repo repo) {
+  pid_t pid;
+  if ((pid = fork()) == 0) {
+    char *argv[] = {"/usr/bin/rm", "-rf", repo.path, NULL};
+    execv(argv[0], argv);
+  }
+  assert(waitpid(pid, NULL, 0) != -1);
+}
+
+int check_for_backupignore() {
+  FILE *file = fopen(".backupignore", "r");
+  if (file == NULL) {
+    fprintf(stderr, "Missing .backupignore file in the current directory\n");
+    return 1;
+  } else fclose(file);
+  return 0;
+}
+
+void copy_over_backupignore(struct tmp_repo repo) {
+  char cp_destination[81];
+  snprintf(cp_destination, 81, "%s/.gitignore", repo.path);
+
+  pid_t pid;
+  if ((pid = fork()) == 0) {
+    char *argv[] = {"/usr/bin/cp", ".backupignore", cp_destination, NULL};
+    execv(argv[0], argv);
+  }
+  assert(waitpid(pid, NULL, 0) != -1);
+}
+
+int is_ignored(struct tmp_repo repo, char *path) {
+  if (is_git_metadata_dir(path)) return 0;
+  int ignored;
+  assert(git_ignore_path_is_ignored(&ignored, repo.repo, path) >= 0);
+  return ignored;
+}
+
+int is_git_metadata_dir(char *path) {
+  int n = strnlen(path, PATH_MAX);
+  for (int i = 0; i < n - 6; i++) {
+    if (strncmp(path + i, "/.git/", 6) == 0) return 1;
+  }
+  return 0;
+}
-- 
cgit v1.2.3