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