new: implement check and update functions

src/ctx/check.c

@@ -0,0 +1,65 @@
+#include "../../include/error.h"
+#include "../../include/util.h"
+#include "../../include/ctx.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+bool lm_ctx_check(lm_ctx_t *ctx, lm_pkg_t *pkg, lm_ctx_check_callback_t callback, void *data){
+  if(NULL == ctx || NULL == pkg){
+    lm_error_set(LM_ERR_ArgNULL);
+    return false;
+  }
+
+  if(NULL == ctx->root){
+    lm_error_set(LM_ERR_CtxRootNULL);
+    return false;
+  }
+
+  if(!lm_ctx_database_init(ctx))
+    return false; // error set by function
+  
+  size_t rootlen = strlen(ctx->root), current = 0, total = 0;
+  char *path = NULL, *hash = NULL, *fhash = NULL;
+  bool keep = false, ret = false;
+
+  total = lm_database_files_count(ctx->db, pkg);
+
+  while(lm_database_files_next(ctx->db, pkg, &path, &hash, &keep)){
+    char fp[rootlen+strlen(path)+10];
+    join(fp, ctx->root, path);
+    current++;
+
+    if(NULL != callback)
+      if(!callback(ctx, pkg, fp, current, total, data))
+        goto end;
+
+    if(!exists(fp)){
+      pdebug(__func__, "skipping %s because file does not exists", fp);
+      continue;
+    }
+
+    if((fhash = get_md5(fp)) == NULL){
+      char *suberr = lm_strerror_dup();
+      pdebug(__func__, "failed to get hash of %s: %s", fp, suberr);
+      lm_error_set(LM_ERR_FileHashFail, fp, suberr);
+      free(suberr);
+      goto end;
+    }
+
+    if(!eq(fhash, hash)){
+      lm_error_set(LM_ERR_FileHashNoMatch, fp);
+      goto end;
+    }
+
+    free(fhash);
+    fhash = NULL;
+  }
+
+  ret = true;
+end:
+  lm_database_files_next_free(ctx->db, pkg, &path, &hash, &keep);
+  free(fhash);
+  return ret;
+}