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-rw-r--r--krebs/v2/default.nix132
1 files changed, 132 insertions, 0 deletions
diff --git a/krebs/v2/default.nix b/krebs/v2/default.nix
new file mode 100644
index 000000000..cba7a75ff
--- /dev/null
+++ b/krebs/v2/default.nix
@@ -0,0 +1,132 @@
+{ lib
+, source
+, target-user ? "root"
+, target-host
+, target-path ? "/var/src"
+}:
+with lib;
+let
+ out = {
+ inherit populate;
+ };
+
+ populate = ''
+ #! /bin/sh
+ set -eu
+
+ verbose() {
+ printf '+%s\n' "$(printf ' %q' "$@")" >&2
+ "$@"
+ }
+
+ 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