40 lines
1.1 KiB
Nix
40 lines
1.1 KiB
Nix
{ runCommand, git, nix }: src:
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let
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srcStr = toString src;
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# Adds the current directory (respecting ignored files) to the git store, and returns the hash
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gitHashFile = runCommand "put-in-git" {
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nativeBuildInputs = [ git ];
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dummy = builtins.currentTime; # impure, do every time
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preferLocalBuild = true;
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} ''
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cd ${srcStr}
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DOT_GIT=$(git rev-parse --resolve-git-dir .git) # path to repo
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cp $DOT_GIT/index $DOT_GIT/index-user # backup index
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git reset # reset index
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git add . # add current directory
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# hash of current directory
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# remove trailing newline
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git rev-parse $(git write-tree) \
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| tr -d '\n' > $out
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mv $DOT_GIT/index-user $DOT_GIT/index # restore index
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'';
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gitHash = builtins.readFile gitHashFile; # cache against git hash
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nixPath = runCommand "put-in-nix" {
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nativeBuildInputs = [ git ];
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preferLocalBuild = true;
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} ''
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mkdir $out
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# dump tar of *current directory* at given revision
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git -C ${srcStr} archive --format=tar ${gitHash} \
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| tar xvf - -C $out
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'';
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in nixPath
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