git-apply: work from subdirectory.

When applying a patch to index file, we need to know where GIT_DIR is;
use setup_git_directory() to find it out.  This also allows us to work
from a subdirectory if we wanted to.

When git-apply is run from a subdirectory, it applies the given patch
only to the files under the current directory and below.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/apply.c b/apply.c
index 50be8f3..1742ab2 100644 (file)
--- a/apply.c
+++ b/apply.c
@@ -16,6 +16,9 @@
 //  --numstat does numeric diffstat, and doesn't actually apply
 //  --index-info shows the old and new index info for paths if available.
 //
+static const char *prefix;
+static int prefix_length = -1;
+
 static int allow_binary_replacement = 0;
 static int check_index = 0;
 static int write_index = 0;
@@ -1706,6 +1709,12 @@ static int use_patch(struct patch *p)
                        return 0;
                x = x->next;
        }
+       if (0 < prefix_length) {
+               int pathlen = strlen(pathname);
+               if (pathlen <= prefix_length ||
+                   memcmp(prefix, pathname, prefix_length))
+                       return 0;
+       }
        return 1;
 }
 
@@ -1845,6 +1854,15 @@ int main(int argc, char **argv)
                        line_termination = 0;
                        continue;
                }
+
+               if (check_index && prefix_length < 0) {
+                       prefix = setup_git_directory();
+                       prefix_length = prefix ? strlen(prefix) : 0;
+                       git_config(git_default_config);
+               }
+               if (0 < prefix_length)
+                       arg = prefix_filename(prefix, prefix_length, arg);
+
                fd = open(arg, O_RDONLY);
                if (fd < 0)
                        usage(apply_usage);