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

// Copyright 2020 Ian Jackson
// SPDX-License-Identifier: GPL-3.0-or-later
// There is NO WARRANTY.

use crate::imports::*;
use crate::utils::*;
use crate::html::*;

type E = anyhow::Error;

pub trait Component : Debug {
  /// creates <outbasepath>[.<extension>] (eg, <basename>.tar)
  ///  from whatever self refers to
  /// invocation directory is unspecified
  /// returns None or ".<extension>"
  /// if adding .<extension> may also create <basename> temporarily
  fn default_desc(&self) -> Html;
  #[throws(E)]
  fn bundle(&self, outbasepath : &String) -> Option<String>;
}

#[derive(Debug)]
pub struct FileComponent(pub String);
impl Component for FileComponent {
  fn default_desc(&self) -> Html {
    Html(format!(r#"file {}"#, Html::from_literal(&self.0).0))
  }
  #[throws(E)]
  fn bundle(&self, outbasepath : &String) -> Option<String> {
    let src = &self.0;
    fs::copy(src, outbasepath)?;
    None
  }
}

#[derive(Debug)]
pub struct DirectoryComponent(Box<dyn Component>);
impl DirectoryComponent {
  #[throws(E)]
  pub fn new(src : String) -> DirectoryComponent {
    let is_git = match fs::metadata(src.to_owned() + "/.git") {
      Ok(_) => true,
      Err(e) if e.kind() == NotFound => false,
      Err(e) => throw!(e),
    };

    DirectoryComponent(if is_git {
      Box::new( GitComponent(src) )
    } else {
      Box::new( RawDirectoryComponent(src) )
    })
  }
}
impl Component for DirectoryComponent {
  fn default_desc(&self) -> Html { self.0.default_desc() }
  #[throws(E)]
  fn bundle(&self, outbasepath : &String) -> Option<String> {
    self.0.bundle(outbasepath)?
  }
}

#[derive(Debug)]
pub struct RawDirectoryComponent(pub String);
impl Component for RawDirectoryComponent {
  fn default_desc(&self) -> Html {
    Html(format!(r#"directory {}"#, Html::from_literal(&self.0).0))
  }
  #[throws(E)]
  fn bundle(&self, outbasepath : &String) -> Option<String> {
    let src = &self.0;
    let mut split = src.rsplitn(2,'/');
    let srcleaf = split.next().unwrap();
    let dir = split.next().ok_or_else(||
      anyhow!("trying to bundle directory with no parent in pathname"))?;
    let outfile = outbasepath.to_owned() + ".tar";
    let stdout = File::create(&outfile)?;
    let mut cmd = tar_command();
    cmd
      .current_dir(&dir)
      .stdout(stdout)
      .args(&["-cf","-","--",srcleaf]);
    run_cmd(cmd).cxm(||format!("tar for raw directory {:?}", &dir))?;
    Some(".tar".to_owned())
  }
}

#[derive(Debug)]
pub struct GitComponent(pub String);
impl Component for GitComponent {
  fn default_desc(&self) -> Html {
    Html(format!(r#"git working directory {}"#,
                 Html::from_literal(&self.0).0))
  }
  #[throws(E)]
  fn bundle(&self, outbasepath : &String) -> Option<String> {
    let src = &self.0;
    let gitclone = r#"#!/bin/bash
      set -e
      set -o pipefail

      src="$1"; shift
      dest="$1"; shift

      rm -rf "$dest"
      mkdir "$dest"
      cd "$dest"
      desta=$(pwd)

      git init -q

      git fetch -q "$src" HEAD
      git update-ref refs/heads/master FETCH_HEAD

      (
        set -e
        cd "$src"
        git ls-files --exclude-standard -oc -z
      ) | (
        cd "$src"
        cpio -p0 -dum --no-preserve-owner --quiet "$desta"
      )

      git reset -q

      cd ..
    "#;

    let mut c = Command::new("bash");
    c.args(&["-ec",gitclone,"x",&src,outbasepath]);
    run_cmd(c).context("git fetch, copy etc. script")?;

    let r = RawDirectoryComponent(outbasepath.clone()).bundle(outbasepath)?;
    remove_dir_all(outbasepath)?;
    r
  }
}