Merge branch 'jc/maint-no-reflog-expire-unreach-for-head'

diff --git a/setup.c b/setup.c
index 5716d90b57574d045114f4aaad1bdf36fd79ed89..5a083fa77dda016d0f3f511787ebf771aaf1be08 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -323,6 +323,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
        const char *gitdirenv;
        const char *gitfile_dir;
        int len, offset, ceil_offset, root_len;
+       int current_device = 0, one_filesystem = 1;
+       struct stat buf;
 
        /*
         * Let's assume that we are in a git repository.
@@ -390,6 +392,12 @@ const char *setup_git_directory_gently(int *nongit_ok)
         *   etc.
         */
        offset = len = strlen(cwd);
+       one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
+       if (one_filesystem) {
+               if (stat(".", &buf))
+                       die_errno("failed to stat '.'");
+               current_device = buf.st_dev;
+       }
        for (;;) {
                gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
                if (gitfile_dir) {
@@ -422,8 +430,27 @@ const char *setup_git_directory_gently(int *nongit_ok)
                        }
                        die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
                }
-               if (chdir(".."))
+               if (one_filesystem) {
+                       if (stat("..", &buf)) {
+                               cwd[offset] = '\0';
+                               die_errno("failed to stat '%s/..'", cwd);
+                       }
+                       if (buf.st_dev != current_device) {
+                               if (nongit_ok) {
+                                       if (chdir(cwd))
+                                               die_errno("Cannot come back to cwd");
+                                       *nongit_ok = 1;
+                                       return NULL;
+                               }
+                               cwd[offset] = '\0';
+                               die("Not a git repository (or any parent up to mount parent %s)\n"
+                               "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
+                       }
+               }
+               if (chdir("..")) {
+                       cwd[offset] = '\0';
                        die_errno("Cannot change to '%s/..'", cwd);
+               }
        }
 
        inside_git_dir = 0;