From 53ecd048919835a116fce1089b78a46a69ecb374 Mon Sep 17 00:00:00 2001
From: "Rafael G. Martins" <rafael@rafaelmartins.eng.br>
Date: Sat, 19 Nov 2016 00:32:07 +0100
Subject: git-receiver: allow to push to mirror manually

---
 man/blogc-git-receiver.1.ronn         | 12 +++++++++
 src/blogc-git-receiver/post-receive.c | 51 ++++++++++++++++++-----------------
 2 files changed, 38 insertions(+), 25 deletions(-)

diff --git a/man/blogc-git-receiver.1.ronn b/man/blogc-git-receiver.1.ronn
index 8aa8099..d5f695f 100644
--- a/man/blogc-git-receiver.1.ronn
+++ b/man/blogc-git-receiver.1.ronn
@@ -133,6 +133,18 @@ as `root`:
 
     # su -s /bin/sh - blogc
 
+### Push to mirror manually
+
+If for some reason you want to push the repository of a given website to remote
+mirror, you can run its `post-receive` hook manually in the server:
+
+    # su -s /bin/sh - blogc
+    $ cd ~/repos/blogs/blogc-example.git
+    $ ./hooks/post-receive
+
+WARNING: If you push manually and your server's repository is empty, you'll clean
+your mirror repository.
+
 ## ENVIRONMENT VARIABLES
 
 `blogc-git-receiver` will export an environment variable called `BLOGC_GIT_RECEIVER`
diff --git a/src/blogc-git-receiver/post-receive.c b/src/blogc-git-receiver/post-receive.c
index efb41a5..98f034a 100644
--- a/src/blogc-git-receiver/post-receive.c
+++ b/src/blogc-git-receiver/post-receive.c
@@ -8,6 +8,7 @@
 
 #include <errno.h>
 #include <stdio.h>
+#include <libgen.h>
 #include <limits.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -46,8 +47,24 @@ bgr_post_receive_get_config_section(bc_config_t *config, const char *repo_path,
 int
 bgr_post_receive_hook(int argc, char *argv[])
 {
+    int rv = 0;
     char *mirror = NULL;
 
+    char *hooks_dir = dirname(argv[0]);  // this was validated by main()
+    char *real_hooks_dir = realpath(hooks_dir, NULL);
+    if (real_hooks_dir == NULL) {
+        fprintf(stderr, "error: failed to guess repository root.\n");
+        return 1;
+    }
+
+    char *repo_path = bc_strdup(dirname(real_hooks_dir));
+    free(real_hooks_dir);
+    if (0 != chdir(repo_path)) {
+        fprintf(stderr, "error: failed to change to repository root\n");
+        rv = 1;
+        goto cleanup;
+    }
+
     // 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
@@ -59,34 +76,18 @@ bgr_post_receive_hook(int argc, char *argv[])
         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;
+        goto cleanup;
     }
 
     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;
+        goto cleanup;
     }
 
     size_t len;
@@ -96,10 +97,9 @@ bgr_post_receive_hook(int argc, char *argv[])
         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;
+        goto cleanup;
     }
 
     bc_config_t *config = bc_config_parse(config_content, len, &err);
@@ -108,19 +108,17 @@ bgr_post_receive_hook(int argc, char *argv[])
         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;
+        goto cleanup;
     }
     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;
+        goto cleanup;
     }
 
     mirror = bc_strdup(bc_config_get(config, config_section, "mirror"));
@@ -129,7 +127,7 @@ bgr_post_receive_hook(int argc, char *argv[])
 
     if (mirror == NULL) {
         fprintf(stderr, "warning: repository mirroring disabled\n");
-        return 0;
+        goto cleanup;
     }
 
 push:
@@ -143,5 +141,8 @@ push:
 
     free(mirror);
 
+cleanup:
+    free(repo_path);
+
     return 0;
 }
-- 
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