From 3cd3dcb5bb3b0481812ddd3ff8dc182bdb20be23 Mon Sep 17 00:00:00 2001
From: "Rafael G. Martins" <rafael@rafaelmartins.eng.br>
Date: Mon, 10 Oct 2016 02:13:47 +0200
Subject: git-receiver: added support to get mirror url from config file

this commit also includes some "integration test" in shell script
---
 src/blogc-git-receiver/post-receive.c | 136 +++++++++++++++++++++++++++++++---
 1 file changed, 127 insertions(+), 9 deletions(-)

(limited to 'src/blogc-git-receiver/post-receive.c')

diff --git a/src/blogc-git-receiver/post-receive.c b/src/blogc-git-receiver/post-receive.c
index 8310939..79c51ac 100644
--- a/src/blogc-git-receiver/post-receive.c
+++ b/src/blogc-git-receiver/post-receive.c
@@ -6,24 +6,142 @@
  * See the file LICENSE.
  */
 
+#include <errno.h>
 #include <stdio.h>
+#include <limits.h>
+#include <unistd.h>
 #include <stdlib.h>
+#include <string.h>
+#include "../common/config-parser.h"
+#include "../common/error.h"
+#include "../common/file.h"
+
+
+char*
+bgr_post_receive_get_config_section(bc_config_t *config, const char *repo_path,
+    const char *home)
+{
+    char *rv = NULL;
+    char** sections = bc_config_list_sections(config);
+    for (size_t i = 0; sections[i] != NULL; i++) {
+        if (bc_str_starts_with(sections[i], "repo:")) {
+            char *tmp_repo = bc_strdup_printf("%s/repos/%s", home, sections[i] + 5);
+            char *real_tmp_repo = realpath(tmp_repo, NULL);  // maybe not needed
+            free(tmp_repo);
+            if (real_tmp_repo == NULL)
+                continue;
+            if (0 == strcmp(real_tmp_repo, repo_path)) {
+                rv = bc_strdup(sections[i]);
+                free(real_tmp_repo);
+                break;
+            }
+            free(real_tmp_repo);
+        }
+    }
+    bc_strv_free(sections);
+    return rv;
+}
 
 
 int
 bgr_post_receive_hook(int argc, char *argv[])
 {
-    if (0 != system("git config --local remote.mirror.pushurl &> /dev/null")) {
-        if (0 != system("git config --local remote.mirror.url &> /dev/null")) {
-            fprintf(stderr, "warning: repository mirroring disabled\n");
-            return 0;
-        }
+    char *mirror = NULL;
+
+    // local repository settings should take precedence, so if the repo have
+    // the 'mirror' remote, just push to it.
+    // this will be removed at some point, but will be kept for compatibility
+    // with old setups.
+    if ((0 == system("git config --local remote.mirror.pushurl &> /dev/null")) ||
+        (0 == system("git config --local remote.mirror.url &> /dev/null")))
+    {
+        mirror = bc_strdup("mirror");
+        goto push;
+    }
+
+    char buffer[4096];
+    if (NULL == getcwd(buffer, sizeof(buffer))) {
+        fprintf(stderr, "warning: failed to get repository remote path, "
+            "mirroring disabled: %s\n", strerror(errno));
+        return 0;
+    }
+
+    char *repo_path = realpath(buffer, NULL);
+    if (repo_path == NULL) {
+        fprintf(stderr, "warning: failed to find remote repository directory, "
+            "mirroring disabled: %s\n", strerror(errno));
+        return 0;
+    }
+
+    char *home = getenv("HOME");
+    if (home == NULL) {
+        fprintf(stderr, "warning: failed to find user home path, "
+            "mirroring disabled\n");
+        free(repo_path);
+        return 0;
+    }
+
+    char *config_file = bc_strdup_printf("%s/blogc-git-receiver.ini", home);
+    if ((0 != access(config_file, F_OK))) {
+        fprintf(stderr, "warning: repository mirroring disabled\n");
+        free(repo_path);
+        free(config_file);
+        return 0;
+    }
+
+    size_t len;
+    bc_error_t *err = NULL;
+    char* config_content = bc_file_get_contents(config_file, true, &len, &err);
+    if (err != NULL) {
+        fprintf(stderr, "warning: failed to read configuration file (%s), "
+            "mirroring disabled: %s\n", config_file, err->msg);
+        bc_error_free(err);
+        free(repo_path);
+        free(config_file);
+        free(config_content);
+        return 0;
+    }
+
+    bc_config_t *config = bc_config_parse(config_content, len, &err);
+    free(config_content);
+    if (err != NULL) {
+        fprintf(stderr, "warning: failed to parse configuration file (%s), "
+            "mirroring disabled: %s\n", config_file, err->msg);
+        bc_error_free(err);
+        free(repo_path);
+        free(config_file);
+        return 0;
+    }
+    free(config_file);
+
+    char *config_section = bgr_post_receive_get_config_section(config, repo_path,
+        home);
+    free(repo_path);
+    if (config_section == NULL) {
+        fprintf(stderr, "warning: repository mirroring disabled\n");
+        bc_config_free(config);
+        return 0;
+    }
+
+    mirror = bc_strdup(bc_config_get(config, config_section, "mirror"));
+    free(config_section);
+    bc_config_free(config);
+
+    if (mirror == NULL) {
+        fprintf(stderr, "warning: repository mirroring disabled\n");
+        return 0;
+    }
+
+push:
+
+    {
+        char *git_cmd = bc_strdup_printf("git push --mirror %s", mirror);
+        if (0 != system(git_cmd))
+            fprintf(stderr, "warning: failed push to git mirror\n");
+        free(git_cmd);
     }
 
-    // at this point we know that we have a remote called mirror, we can just
-    // push to it.
-    if (0 != system("git push --mirror mirror"))
-        fprintf(stderr, "warning: failed push to git mirror\n");
+    free(mirror);
 
     return 0;
 }
-- 
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