populate: refer to flakes as git+file: only with a usable .git

Writing the lock file of a git+file: flake, Nix runs Git, with the
repository's configuration and hooks, which may run commands.  A .git
in a source's directory can come from anywhere, e.g. one planted in a
materialized flake, or one a file source keeps.  So drawing inputs
refers to a flake as git+file: only if git_problems finds nothing wrong
with its .git directory, the way git sources check their work trees,
and else as path:.

lock-foreign-git plants a .git in a materialized flake and in a file
source that keeps it, whose configuration names an fsmonitor command.

1 files changed, 2 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3875460..d71c57e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@
 - `git` sources also refuse work trees whose `.git` directory contains
   hooks, or in which a submodule's `.git` isn't a file naming a repository
   in `.git/modules`, unless `reclone` is set.
+- Drawing inputs refers to a source in a Git work tree as `git+file:` only
+  if a `git` source would use its `.git` directory, and else as `path:`.
 - `git` sources with a branch or tag as `ref` follow it: populate fetches
   the branch or tag on every run, and resets the work tree to what it
   fetched.