tjh.dev
1{ runCommand, git, lib }:
2
3lib.makeOverridable (
4src:
5
6let
7 srcStr = toString src;
8
9 # Adds the current directory (respecting ignored files) to the git store, and returns the hash
10 gitHashFile = runCommand "put-in-git" {
11 nativeBuildInputs = [ git ];
12 dummy = builtins.currentTime; # impure, do every time
13 preferLocalBuild = true;
14 } ''
15 cd ${srcStr}
16 DOT_GIT=$(git rev-parse --resolve-git-dir .git) # path to repo
17
18 cp $DOT_GIT/index $DOT_GIT/index-user # backup index
19 git reset # reset index
20 git add . # add current directory
21
22 # hash of current directory
23 # remove trailing newline
24 git rev-parse $(git write-tree) \
25 | tr -d '\n' > $out
26
27 mv $DOT_GIT/index-user $DOT_GIT/index # restore index
28 '';
29
30 gitHash = builtins.readFile gitHashFile; # cache against git hash
31
32 nixPath = runCommand "put-in-nix" {
33 nativeBuildInputs = [ git ];
34 preferLocalBuild = true;
35 } ''
36 mkdir $out
37
38 # dump tar of *current directory* at given revision
39 git -C ${srcStr} archive --format=tar ${gitHash} \
40 | tar xf - -C $out
41 '';
42
43in nixPath
44)