summaryrefslogtreecommitdiffstats
path: root/krebs/v2/default.nix
blob: 78e990d1c8c062fefec83a3a7d4cc57180ed907b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
{ source
, target-user ? "root"
, target-host
, target-path ? "/var/src"
}:
with import <nixpkgs/lib>;
with import ~/stockholm/krebs/4lib {
  lib = import <nixpkgs/lib>;
};
with builtins;
let
  out = {
    inherit populate;
  };

  populate = ''
    #! /bin/sh
    set -eu

    verbose() {
      printf '+' >&2
      printf ' %q' "$@" >&2
      printf '\n'
      "$@"
    }

    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 '+' >&2
      printf ' %q' "$@" >&2
      printf '\n'
    }

    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