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Diffstat (limited to 'nix/fetchTree.nix')
| -rw-r--r-- | nix/fetchTree.nix | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/nix/fetchTree.nix b/nix/fetchTree.nix new file mode 100644 index 0000000..26de85b --- /dev/null +++ b/nix/fetchTree.nix @@ -0,0 +1,172 @@ +# this code is slightly modified from https://github.com/edolstra/flake-compat +## +## Copyright (c) 2020-2021 Eelco Dolstra and the flake-compat contributors +## +## Permission is hereby granted, free of charge, to any person obtaining +## a copy of this software and associated documentation files (the +## "Software"), to deal in the Software without restriction, including +## without limitation the rights to use, copy, modify, merge, publish, +## distribute, sublicense, and/or sell copies of the Software, and to +## permit persons to whom the Software is furnished to do so, subject to +## the following conditions: +## +## The above copyright notice and this permission notice shall be +## included in all copies or substantial portions of the Software. +## +## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +## EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +## MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +## NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +## LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +## OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +## WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +let + formatSecondsSinceEpoch = t: let + rem = x: y: x - x / y * y; + days = t / 86400; + secondsInDay = rem t 86400; + hours = secondsInDay / 3600; + minutes = (rem secondsInDay 3600) / 60; + seconds = rem t 60; + + # Courtesy of https://stackoverflow.com/a/32158604. + z = days + 719468; + era = + ( + if z >= 0 + then z + else z - 146096 + ) + / 146097; + doe = z - era * 146097; + yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; + y = yoe + era * 400; + doy = doe - (365 * yoe + yoe / 4 - yoe / 100); + mp = (5 * doy + 2) / 153; + d = doy - (153 * mp + 2) / 5 + 1; + m = + mp + + ( + if mp < 10 + then 3 + else -9 + ); + y' = + y + + ( + if m <= 2 + then 1 + else 0 + ); + + pad = s: + if builtins.stringLength s < 2 + then "0" + s + else s; + in "${toString y'}${pad (toString m)}${pad (toString d)}${pad (toString hours)}${pad (toString minutes)}${pad (toString seconds)}"; + + fetchTree = info: + if info.type == "github" + then { + outPath = + fetchTarball + ( + {url = "https://api.${info.host or "github.com"}/repos/${info.owner}/${info.repo}/tarball/${info.rev}";} + // ( + if info ? narHash + then {sha256 = info.narHash;} + else {} + ) + ); + inherit (info) rev lastModified narHash; + shortRev = builtins.substring 0 7 info.rev; + lastModifiedDate = formatSecondsSinceEpoch info.lastModified; + } + else if info.type == "git" + then + { + outPath = + builtins.fetchGit + ( + {inherit (info) url;} + // ( + if info ? rev + then {inherit (info) rev;} + else {} + ) + // ( + if info ? ref + then {inherit (info) ref;} + else {} + ) + // ( + if info ? submodules + then {inherit (info) submodules;} + else {} + ) + ); + inherit (info) lastModified narHash; + lastModifiedDate = formatSecondsSinceEpoch info.lastModified; + } + // ( + if info ? rev + then { + inherit (info) rev; + shortRev = builtins.substring 0 7 info.rev; + } + else { + } + ) + else if info.type == "path" + then { + outPath = builtins.path {inherit (info) path;}; + inherit (info) narHash; + } + else if info.type == "tarball" + then { + outPath = + fetchTarball + ( + {inherit (info) url;} + // ( + if info ? narHash + then {sha256 = info.narHash;} + else {} + ) + ); + } + else if info.type == "gitlab" + then { + inherit (info) rev narHash lastModified; + outPath = + fetchTarball + ( + {url = "https://${info.host or "gitlab.com"}/api/v4/projects/${info.owner}%2F${info.repo}/repository/archive.tar.gz?sha=${info.rev}";} + // ( + if info ? narHash + then {sha256 = info.narHash;} + else {} + ) + ); + shortRev = builtins.substring 0 7 info.rev; + } + else if info.type == "sourcehut" + then { + inherit (info) rev narHash lastModified; + outPath = + fetchTarball + ( + {url = "https://${info.host or "git.sr.ht"}/${info.owner}/${info.repo}/archive/${info.rev}.tar.gz";} + // ( + if info ? narHash + then {sha256 = info.narHash;} + else {} + ) + ); + shortRev = builtins.substring 0 7 info.rev; + } + else + # FIXME: add Mercurial, tarball inputs. + throw "flake input has unsupported input type '${info.type}'"; +in + fetchTree |