From 47cfc9bd7d0add617cf6d928e96b7d207be614f1 Mon Sep 17 00:00:00 2001 From: Karthik Nayak Date: Sat, 14 Jan 2023 09:30:38 +0100 Subject: attr: add flag `--source` to work with tree-ish The contents of the .gitattributes files may evolve over time, but "git check-attr" always checks attributes against them in the working tree and/or in the index. It may be beneficial to optionally allow the users to check attributes taken from a commit other than HEAD against paths. Add a new flag `--source` which will allow users to check the attributes against a commit (actually any tree-ish would do). When the user uses this flag, we go through the stack of .gitattributes files but instead of checking the current working tree and/or in the index, we check the blobs from the provided tree-ish object. This allows the command to also be used in bare repositories. Since we use a tree-ish object, the user can pass "--source HEAD:subdirectory" and all the attributes will be looked up as if subdirectory was the root directory of the repository. We cannot simply use the `:` syntax without the `--source` flag, similar to how it is used in `git show` because any non-flag parameter before `--` is treated as an attribute and any parameter after `--` is treated as a pathname. The change involves creating a new function `read_attr_from_blob`, which given the path reads the blob for the path against the provided source and parses the attributes line by line. This function is plugged into `read_attr()` function wherein we go through the stack of attributes files. Signed-off-by: Karthik Nayak Signed-off-by: Toon Claes Co-authored-by: toon@iotcl.com Signed-off-by: Junio C Hamano --- userdiff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'userdiff.c') diff --git a/userdiff.c b/userdiff.c index e25356a061..d71b82feb7 100644 --- a/userdiff.c +++ b/userdiff.c @@ -413,7 +413,7 @@ struct userdiff_driver *userdiff_find_by_path(struct index_state *istate, check = attr_check_initl("diff", NULL); if (!path) return NULL; - git_check_attr(istate, path, check); + git_check_attr(istate, NULL, path, check); if (ATTR_TRUE(check->items[0].value)) return &driver_true; -- cgit v1.2.3