eac6797380
This is useful when running tools like NixOps or nix-review on workstations where the upload to the builder is significantly slower then downloading the source on the builder itself.
71 lines
2.4 KiB
Nix
71 lines
2.4 KiB
Nix
{stdenvNoCC, git, cacert}: let
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urlToName = url: rev: let
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inherit (stdenvNoCC.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 = if (builtins.match "[a-f0-9]*" rev) != null
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then "-${short}"
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else "";
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in "${if matched == null then base else builtins.head matched}${appendShort}";
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in
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{ url, rev ? "HEAD", md5 ? "", sha256 ? "", leaveDotGit ? deepClone
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, fetchSubmodules ? true, deepClone ? false
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, branchName ? null
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, name ? urlToName url rev
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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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}:
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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 may be a security risk
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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 $N.
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Even if git folks implemented this feature soon it may take years until
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server admins start using the new version?
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*/
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assert deepClone -> leaveDotGit;
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if md5 != "" then
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throw "fetchgit does not support md5 anymore, please use sha256"
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else
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stdenvNoCC.mkDerivation {
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inherit name;
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builder = ./builder.sh;
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fetcher = "${./nix-prefetch-git}"; # This must be a string to ensure it's called with bash.
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nativeBuildInputs = [git];
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outputHashAlgo = "sha256";
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outputHashMode = "recursive";
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outputHash = sha256;
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inherit url rev leaveDotGit fetchSubmodules deepClone branchName postFetch;
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GIT_SSL_CAINFO = "${cacert}/etc/ssl/certs/ca-bundle.crt";
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impureEnvVars = stdenvNoCC.lib.fetchers.proxyImpureEnvVars ++ [
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"GIT_PROXY_COMMAND" "SOCKS_SERVER"
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];
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inherit preferLocalBuild;
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}
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