125 lines
4 KiB
Nix
125 lines
4 KiB
Nix
{lib, stdenvNoCC, git, git-lfs, cacert}: let
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urlToName = url: rev: let
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inherit (lib) removeSuffix splitString last;
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base = last (splitString ":" (baseNameOf (removeSuffix "/" url)));
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matched = builtins.match "(.*)\\.git" base;
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short = builtins.substring 0 7 rev;
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appendShort = lib.optionalString ((builtins.match "[a-f0-9]*" rev) != null) "-${short}";
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in "${if matched == null then base else builtins.head matched}${appendShort}";
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in
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lib.makeOverridable (lib.fetchers.withNormalizedHash { } (
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# NOTE Please document parameter additions or changes in
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# doc/build-helpers/fetchers.chapter.md
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{ url
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, tag ? null
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, rev ? null
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, leaveDotGit ? deepClone
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, outputHash ? lib.fakeHash, outputHashAlgo ? null
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, fetchSubmodules ? true, deepClone ? false
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, branchName ? null
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, sparseCheckout ? []
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, nonConeMode ? false
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, name ? null
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, # Shell code executed after the file has been fetched
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# successfully. This can do things like check or transform the file.
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postFetch ? ""
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, preferLocalBuild ? true
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, fetchLFS ? false
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, # Shell code to build a netrc file for BASIC auth
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netrcPhase ? null
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, # Impure env vars (https://nixos.org/nix/manual/#sec-advanced-attributes)
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# needed for netrcPhase
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netrcImpureEnvVars ? []
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, meta ? {}
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, allowedRequisites ? null
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}:
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/* NOTE:
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fetchgit has one problem: git fetch only works for refs.
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This is because fetching arbitrary (maybe dangling) commits creates garbage collection risks
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and checking whether a commit belongs to a ref is expensive. This may
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change in the future when some caching is added to git (?)
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Usually refs are either tags (refs/tags/*) or branches (refs/heads/*)
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Cloning branches will make the hash check fail when there is an update.
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But not all patches we want can be accessed by tags.
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The workaround is getting the last n commits so that it's likely that they
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still contain the hash we want.
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for now : increase depth iteratively (TODO)
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real fix: ask git folks to add a
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git fetch $HASH contained in $BRANCH
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facility because checking that $HASH is contained in $BRANCH is less
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expensive than fetching --depth $N.
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Even if git folks implemented this feature soon it may take years until
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server admins start using the new version?
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*/
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assert deepClone -> leaveDotGit;
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assert nonConeMode -> (sparseCheckout != []);
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let
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revWithTag =
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let
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warningMsg = "fetchgit requires one of either `rev` or `tag` to be provided (not both).";
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otherIsNull = other: lib.assertMsg (other == null) warningMsg;
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in
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if tag != null then
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assert (otherIsNull rev);
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"refs/tags/${tag}"
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else if rev != null then
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assert (otherIsNull tag);
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rev
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else
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# FIXME fetching HEAD if no rev or tag is provided is problematic at best
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"HEAD";
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in
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if builtins.isString sparseCheckout then
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# Changed to throw on 2023-06-04
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throw "Please provide directories/patterns for sparse checkout as a list of strings. Passing a (multi-line) string is not supported any more."
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else
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stdenvNoCC.mkDerivation {
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name = if name != null then name else urlToName url revWithTag;
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builder = ./builder.sh;
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fetcher = ./nix-prefetch-git;
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nativeBuildInputs = [ git cacert ]
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++ lib.optionals fetchLFS [ git-lfs ];
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inherit outputHash outputHashAlgo;
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outputHashMode = "recursive";
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# git-sparse-checkout(1) says:
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# > When the --stdin option is provided, the directories or patterns are read
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# > from standard in as a newline-delimited list instead of from the arguments.
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sparseCheckout = builtins.concatStringsSep "\n" sparseCheckout;
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inherit url leaveDotGit fetchLFS fetchSubmodules deepClone branchName nonConeMode postFetch;
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rev = revWithTag;
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postHook = if netrcPhase == null then null else ''
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${netrcPhase}
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# required that git uses the netrc file
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mv {,.}netrc
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export NETRC=$PWD/.netrc
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export HOME=$PWD
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'';
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impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ netrcImpureEnvVars ++ [
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"GIT_PROXY_COMMAND" "NIX_GIT_SSL_CAINFO" "SOCKS_SERVER"
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];
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inherit preferLocalBuild meta allowedRequisites;
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passthru = {
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gitRepoUrl = url;
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};
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}
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))
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