scan_path(): Improve handling of inaccessible directories

When scanning a tree containing inaccessible directories (e.g. '.ssh'
directories in users' homedirs, or repos with explicitly restricted access),
scan_path() currently causes three lines of "Permissions denied" errors to be
printed to the CGI error log per inaccessible directory:

  Error checking path /home/foo/.ssh: Permission denied (13)
  Error checking path /home/foo/.ssh/.git: Permission denied (13)
  Error opening directory /home/foo/.ssh: Permission denied (13)

This is a side-effect of calling is_git_dir(path) and
is_git_dir(fmt("%s/.git", path) _before_ we try to opendir(path).

By placing the opendir(path) before the two is_git_dir() calls, we reduce the
noise to a single line per inaccessible directory:

  Error opening directory /home/foo/.ssh: Permission denied (13)

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Lars Hjemli <larsh@prediktor.no>

1 files changed, 9 insertions, 9 deletions

diff --git a/scan-tree.c b/scan-tree.c
index a0e09ce..eda8c67 100644
--- a/scan-tree.c
+++ b/scan-tree.c
@@ -138,91 +138,91 @@ static void add_repo(const char *base, const char *path, repo_config_fn fn)
                         while (slash && n && (slash = xstrrchr(rel, slash, '/')))
                                 n++;
                 }
                 if (slash && !n) {
                         *slash = '\0';
                         repo->section = xstrdup(rel);
                         *slash = '/';
                         if (!prefixcmp(repo->name, repo->section)) {
                                 repo->name += strlen(repo->section);
                                 if (*repo->name == '/')
                                         repo->name++;
                         }
                 }
         }
 
         p = fmt("%s/cgitrc", path);
         if (!stat(p, &st)) {
                 config_fn = fn;
                 parse_configfile(xstrdup(p), &repo_config);
         }
 }
 
 static void scan_path(const char *base, const char *path, repo_config_fn fn)
 {
-        DIR *dir;
+        DIR *dir = opendir(path);
         struct dirent *ent;
         char *buf;
         struct stat st;
 
+        if (!dir) {
+                fprintf(stderr, "Error opening directory %s: %s (%d)\n",
+                        path, strerror(errno), errno);
+                return;
+        }
         if (is_git_dir(path)) {
                 add_repo(base, path, fn);
-                return;
+                goto end;
         }
         if (is_git_dir(fmt("%s/.git", path))) {
                 add_repo(base, fmt("%s/.git", path), fn);
-                return;
-        }
-        dir = opendir(path);
-        if (!dir) {
-                fprintf(stderr, "Error opening directory %s: %s (%d)\n",
-                        path, strerror(errno), errno);
-                return;
+                goto end;
         }
         while((ent = readdir(dir)) != NULL) {
                 if (ent->d_name[0] == '.') {
                         if (ent->d_name[1] == '\0')
                                 continue;
                         if (ent->d_name[1] == '.' && ent->d_name[2] == '\0')
                                 continue;
                 }
                 buf = malloc(strlen(path) + strlen(ent->d_name) + 2);
                 if (!buf) {
                         fprintf(stderr, "Alloc error on %s: %s (%d)\n",
                                 path, strerror(errno), errno);
                         exit(1);
                 }
                 sprintf(buf, "%s/%s", path, ent->d_name);
                 if (stat(buf, &st)) {
                         fprintf(stderr, "Error checking path %s: %s (%d)\n",
                                 buf, strerror(errno), errno);
                         free(buf);
                         continue;
                 }
                 if (S_ISDIR(st.st_mode))
                         scan_path(base, buf, fn);
                 free(buf);
         }
+end:
         closedir(dir);
 }
 
 #define lastc(s) s[strlen(s) - 1]
 
 void scan_projects(const char *path, const char *projectsfile, repo_config_fn fn)
 {
         char line[MAX_PATH * 2], *z;
         FILE *projects;
         int err;
         
         projects = fopen(projectsfile, "r");
         if (!projects) {
                 fprintf(stderr, "Error opening projectsfile %s: %s (%d)\n",
                         projectsfile, strerror(errno), errno);
         }
         while (fgets(line, sizeof(line), projects) != NULL) {
                 for (z = &lastc(line);
                      strlen(line) && strchr("\n\r", *z);
                      z = &lastc(line))
                         *z = '\0';
                 if (strlen(line))
                         scan_path(path, fmt("%s/%s", path, line), fn);
         }