101 lines
3.0 KiB
Nix
101 lines
3.0 KiB
Nix
# a small helper that only builds on top of builtins functions
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{src}@inputs:
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builtins // (let
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formatSecondsSinceEpoch = t:
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let
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rem = x: y: x - x / y * y;
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days = t / 86400;
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secondsInDay = rem t 86400;
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hours = secondsInDay / 3600;
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minutes = (rem secondsInDay 3600) / 60;
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seconds = rem t 60;
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# Courtesy of https://stackoverflow.com/a/32158604.
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z = days + 719468;
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era = (if z >= 0 then z else z - 146096) / 146097;
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doe = z - era * 146097;
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yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
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y = yoe + era * 400;
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doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
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mp = (5 * doy + 2) / 153;
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d = doy - (153 * mp + 2) / 5 + 1;
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m = mp + (if mp < 10 then 3 else -9);
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y' = y + (if m <= 2 then 1 else 0);
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pad = s: if builtins.stringLength s < 2 then "0" + s else s;
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in "${toString y'}${pad (toString m)}${pad (toString d)}${pad (toString hours)}"
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+ "${pad (toString minutes)}${pad (toString seconds)}";
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fetchTree =
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# this is the value of flake.lock#lock.nodes.${input_name}.locked
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{type
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, host? ""
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, owner? ""
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, repo? ""
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, rev? ""
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, submodules? ""
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, path? ""
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, narHash? null
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, lastModified? 0
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}@info:
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if info.type == "github" then
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{ outPath =
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fetchTarball
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({ url = "https://api.${info.host or "github.com"}/repos/"
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+ "${info.owner}/${info.repo}/tarball/${info.rev}"; }
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// (if info ? narHash then { sha256 = info.narHash; } else {})
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);
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rev = info.rev;
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shortRev = builtins.substring 0 7 info.rev;
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lastModified = info.lastModified;
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lastModifiedDate = formatSecondsSinceEpoch info.lastModified;
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narHash = info.narHash;
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}
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else if info.type == "git" then
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{ outPath =
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builtins.fetchGit
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({ url = info.url; }
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// (if info ? rev then { inherit (info) rev; } else {})
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// (if info ? ref then { inherit (info) ref; } else {})
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// (if info ? submodules then { inherit (info) submodules; } else {})
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);
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lastModified = info.lastModified;
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lastModifiedDate = formatSecondsSinceEpoch info.lastModified;
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narHash = info.narHash;
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} // (if info ? rev then {
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rev = info.rev;
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shortRev = builtins.substring 0 7 info.rev;
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} else {
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})
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else if info.type == "path" then
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{ outPath = builtins.path {
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path = if builtins.substring 0 1 info.path != "/"
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then src + ("/" + info.path) # make this absolute path by prepending ./
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else info.path; # it's already an absolute path
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};
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narHash = info.narHash;
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}
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else if info.type == "tarball" then
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{ outPath =
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fetchTarball
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({ inherit (info) url; }
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// (if info ? narHash then { sha256 = info.narHash; } else {})
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);
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}
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else if info.type == "gitlab" then
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{ inherit (info) rev narHash lastModified;
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outPath =
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fetchTarball
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({ url = "https://${info.host or "gitlab.com"}/api/v4/projects/${info.owner}%2F${info.repo}/repository/archive.tar.gz?sha=${info.rev}"; }
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// (if info ? narHash then { sha256 = info.narHash; } else {})
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);
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shortRev = builtins.substring 0 7 info.rev;
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}
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else
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# FIXME: add Mercurial, tarball inputs.
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throw "flake input has unsupported input type '${info.type}'";
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in {
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inherit fetchTree;
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})
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