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caff183402
No intended functional difference, just trying to polish to make this easier to extend and more aligned with other nix conventions.
72 lines
2.4 KiB
Nix
72 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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