krebs.build.populate: init and drop support for v1

1 files changed, 147 insertions, 71 deletions

diff --git a/krebs/3modules/build.nix b/krebs/3modules/build.nix
index 0f8aec89..00142acd 100644
--- a/krebs/3modules/build.nix
+++ b/krebs/3modules/build.nix
@@ -28,81 +28,157 @@ let
       type = types.user;
     };
 
-    options.krebs.build.source-version = mkOption {
-      type = types.enum [ 1 2 ];
-      default = 1;
+    options.krebs.build.source = let
+      raw = types.either types.str types.path;
+      url = types.submodule {
+        options = {
+          url = mkOption {
+            type = types.str;
+          };
+          rev = mkOption {
+            type = types.str;
+          };
+          dev = mkOption {
+            type = types.str;
+          };
+        };
+      };
+    in mkOption {
+      type = types.attrsOf (types.either types.str url);
+      apply = let f = mapAttrs (_: value: {
+        string = value;
+        path = toString value;
+        set = f value;
+      }.${typeOf value}); in f;
+      default = {};
     };
 
-    options.krebs.build.source = getAttr "v${toString config.krebs.build.source-version}" {
-      v1 = {
-        dir = mkOption {
-          type = let
-            default-host = config.krebs.current.host;
-          in types.attrsOf (types.submodule ({ config, ... }: {
-            options = {
-              host = mkOption {
-                type = types.host;
-                default = default-host;
-              };
-              path = mkOption {
-                type = types.str;
-              };
-              target-path = mkOption {
-                type = types.str;
-                default = "/root/${config._module.args.name}";
-              };
-              url = mkOption {
-                type = types.str;
-                default = "file://${config.host.name}${config.path}";
-              };
-            };
-          }));
-          default = {};
-        };
+    options.krebs.build.populate = mkOption {
+      type = types.str;
+      default = let
+        source = config.krebs.build.source;
+        target-user = maybeEnv "target_user" "root";
+        target-host = maybeEnv "target_host" config.krebs.build.host.name;
+        target-path = maybeEnv "target_path" "/var/src";
+        out = ''
+          #! /bin/sh
+          set -eu
 
-        git = mkOption {
-          type = with types; attrsOf (submodule ({ config, ... }: {
-            options = {
-              url = mkOption {
-                type = types.str; # TODO must be shell safe
-              };
-              rev = mkOption {
-                type = types.str;
-              };
-              target-path = mkOption {
-                type = types.str;
-                default = "/root/${config._module.args.name}";
-              };
-            };
-          }));
-          default = {};
-        };
-      };
+          verbose() {
+            printf '+%s\n' "$(printf ' %q' "$@")" >&2
+            "$@"
+          }
 
-      v2 = let
-        raw = types.either types.str types.path;
-        url = types.submodule {
-          options = {
-            url = mkOption {
-              type = types.str;
-            };
-            rev = mkOption {
-              type = types.str;
-            };
-            dev = mkOption {
-              type = types.str;
-            };
-          };
-        };
-      in mkOption {
-        type = types.attrsOf (types.either types.str url);
-        apply = let f = mapAttrs (_: value: {
-          string = value;
-          path = toString value;
-          set = f value;
-        }.${typeOf value}); in f;
-        default = {};
-      };
+          echo ${shell.escape git-script} \
+            | ssh ${shell.escape "${target-user}@${target-host}"} -T
+
+          unset tmpdir
+          trap '
+            rm "$tmpdir"/*
+            rmdir "$tmpdir"
+            trap - EXIT INT QUIT
+          '        EXIT INT QUIT
+          tmpdir=$(mktemp -dt stockholm.XXXXXXXX)
+          chmod 0755 "$tmpdir"
+
+          ${concatStringsSep "\n"
+            (mapAttrsToList
+              (name: spec: let dst = removePrefix "symlink:" (get-url spec); in
+                "verbose ln -s ${shell.escape dst} $tmpdir/${shell.escape name}")
+              symlink-specs)}
+
+          verbose proot \
+              -b $tmpdir:${shell.escape target-path} \
+              ${concatStringsSep " \\\n    "
+                (mapAttrsToList
+                  (name: spec:
+                    "-b ${shell.escape "${get-url spec}:${target-path}/${name}"}")
+                  file-specs)} \
+              rsync \
+                  -f ${shell.escape "P /*"} \
+                  ${concatMapStringsSep " \\\n        "
+                    (name: "-f ${shell.escape "R /${name}"}")
+                    (attrNames file-specs)} \
+                  --delete \
+                  -vFrlptD \
+                  ${shell.escape target-path}/ \
+                  ${shell.escape "${target-user}@${target-host}:${target-path}"}
+        '';
+
+        get-schema = uri:
+          if substring 0 1 uri == "/"
+            then "file"
+            else head (splitString ":" uri);
+
+        has-schema = schema: uri: get-schema uri == schema;
+
+        get-url = spec: {
+          string = spec;
+          path = toString spec;
+          set = get-url spec.url;
+        }.${typeOf spec};
+
+        git-specs =
+          filterAttrs (_: spec: has-schema "https" (get-url spec)) source //
+          filterAttrs (_: spec: has-schema "http" (get-url spec)) source //
+          filterAttrs (_: spec: has-schema "git" (get-url spec)) source;
+
+        file-specs =
+          filterAttrs (_: spec: has-schema "file" (get-url spec)) source;
+
+        symlink-specs =
+          filterAttrs (_: spec: has-schema "symlink" (get-url spec)) source;
+
+        git-script = ''
+          #! /bin/sh
+          set -efu
+
+          verbose() {
+            printf '+%s\n' "$(printf ' %q' "$@")" >&2
+            "$@"
+          }
+
+          fetch_git() {(
+            dst_dir=$1
+            src_url=$2
+            src_ref=$3
+
+            if ! test -e "$dst_dir"; then
+              git clone "$src_url" "$dst_dir"
+            fi
+
+            cd "$dst_dir"
+
+            if ! url=$(git config remote.origin.url); then
+              git remote add origin "$src_url"
+            elif test "$url" != "$src_url"; then
+              git remote set-url origin "$src_url"
+            fi
+
+            # TODO resolve src_ref to commit hash
+            hash=$src_ref
+
+            if ! test "$(git log --format=%H -1)" = "$hash"; then
+              git fetch origin
+              git checkout "$hash" -- "$dst_dir"
+              git checkout "$hash"
+            fi
+
+            git clean -dxf
+          )}
+
+          ${concatStringsSep "\n"
+            (mapAttrsToList
+              (name: spec: toString (map shell.escape [
+                "verbose"
+                "fetch_git"
+                "${target-path}/${name}"
+                spec.url
+                spec.rev
+              ]))
+              git-specs)}
+        '';
+      in out;
     };
 
   };