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-rwxr-xr-xbin/nixpkgs-rev13
1 files changed, 13 insertions, 0 deletions
diff --git a/bin/nixpkgs-rev b/bin/nixpkgs-rev
new file mode 100755
index 0000000..1acde1e
--- /dev/null
+++ b/bin/nixpkgs-rev
@@ -0,0 +1,13 @@
+#! /bin/sh
+# nixpkgs-rev : nixos-config -> git_rev
+set -euf
+nix-instantiate \
+ -I nixos-config="$1" \
+ --eval \
+ --json \
+ -E \
+ '
+ (import <nixos-config> {config={}; pkgs={};}).nixpkgs.rev
+ ' \
+ 2> /dev/null \
+ | jq -r . 2> /dev/null