Install sample hooks

[git.git] / init-db.c

diff --git a/init-db.c b/init-db.c
index c78c495..fcb55f6 100644 (file)
--- a/init-db.c
+++ b/init-db.c
@@ -15,6 +15,147 @@ static void safe_create_dir(const char *dir)
        }
 }
 
+static int copy_file(const char *dst, const char *src, int mode)
+{
+       int fdi, fdo;
+
+       mode = (mode & 0111) ? 0777 : 0666;
+       if ((fdi = open(src, O_RDONLY)) < 0)
+               return fdi;
+       if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
+               close(fdi);
+               return fdo;
+       }
+       while (1) {
+               char buf[BUFSIZ];
+               ssize_t leni, leno, ofs;
+               leni = read(fdi, buf, sizeof(buf));
+               if (leni < 0) {
+               error_return:
+                       close(fdo);
+                       close(fdi);
+                       return -1;
+               }
+               if (!leni)
+                       break;
+               ofs = 0;
+               do {
+                       leno = write(fdo, buf+ofs, leni);
+                       if (leno < 0)
+                               goto error_return;
+                       leni -= leno;
+                       ofs += leno;
+               } while (0 < leni);
+       }
+       close(fdo);
+       close(fdi);
+       return 0;
+}
+
+static void copy_templates_1(char *path, int baselen,
+                            char *template, int template_baselen,
+                            DIR *dir)
+{
+       struct dirent *de;
+
+       /* Note: if ".git/hooks" file exists in the repository being
+        * re-initialized, /etc/core-git/templates/hooks/update would
+        * cause git-init-db to fail here.  I think this is sane but
+        * it means that the set of templates we ship by default, along
+        * with the way the namespace under .git/ is organized, should
+        * be really carefully chosen.
+        */
+       safe_create_dir(path);
+       while ((de = readdir(dir)) != NULL) {
+               struct stat st_git, st_template;
+               int namelen;
+               int exists = 0;
+
+               if (de->d_name[0] == '.')
+                       continue;
+               namelen = strlen(de->d_name);
+               if ((PATH_MAX <= baselen + namelen) ||
+                   (PATH_MAX <= template_baselen + namelen))
+                       die("insanely long template name %s", de->d_name);
+               memcpy(path + baselen, de->d_name, namelen+1);
+               memcpy(template + template_baselen, de->d_name, namelen+1);
+               if (lstat(path, &st_git)) {
+                       if (errno != ENOENT)
+                               die("cannot stat %s", path);
+               }
+               else
+                       exists = 1;
+
+               if (lstat(template, &st_template))
+                       die("cannot stat template %s", template);
+
+               if (S_ISDIR(st_template.st_mode)) {
+                       DIR *subdir = opendir(template);
+                       int baselen_sub = baselen + namelen;
+                       int template_baselen_sub = template_baselen + namelen;
+                       if (!subdir)
+                               die("cannot opendir %s", template);
+                       path[baselen_sub++] =
+                               template[template_baselen_sub++] = '/';
+                       path[baselen_sub] =
+                               template[template_baselen_sub] = 0;
+                       copy_templates_1(path, baselen_sub,
+                                        template, template_baselen_sub,
+                                        subdir);
+                       closedir(subdir);
+               }
+               else if (exists)
+                       continue;
+               else if (S_ISLNK(st_template.st_mode)) {
+                       char lnk[256];
+                       int len;
+                       len = readlink(template, lnk, sizeof(lnk));
+                       if (len < 0)
+                               die("cannot readlink %s", template);
+                       if (sizeof(lnk) <= len)
+                               die("insanely long symlink %s", template);
+                       lnk[len] = 0;
+                       if (symlink(lnk, path))
+                               die("cannot symlink %s %s", lnk, path);
+               }
+               else if (S_ISREG(st_template.st_mode)) {
+                       if (copy_file(path, template, st_template.st_mode))
+                               die("cannot copy %s to %s", template, path);
+               }
+               else
+                       error("ignoring template %s", template);
+       }
+}
+
+static void copy_templates(const char *git_dir)
+{
+       char path[PATH_MAX];
+       char template_path[PATH_MAX];
+       char *template_dir;
+       int len, template_len;
+       DIR *dir;
+
+       strcpy(path, git_dir);
+       len = strlen(path);
+       template_dir = gitenv(TEMPLATE_DIR_ENVIRONMENT);
+       if (!template_dir)
+               template_dir = DEFAULT_GIT_TEMPLATE_ENVIRONMENT;
+       strcpy(template_path, template_dir);
+       template_len = strlen(template_path);
+       if (template_path[template_len-1] != '/') {
+               template_path[template_len++] = '/';
+               template_path[template_len] = 0;
+       }
+
+       dir = opendir(template_path);
+       if (!dir)
+               return;
+       copy_templates_1(path, len,
+                        template_path, template_len,
+                        dir);
+       closedir(dir);
+}
+
 static void create_default_files(const char *git_dir)
 {
        unsigned len = strlen(git_dir);
@@ -48,6 +189,7 @@ static void create_default_files(const char *git_dir)
                        exit(1);
                }
        }
+       copy_templates(path);
 }
 
 /*