aboutsummaryrefslogtreecommitdiff
path: root/libbuild2/filesystem.cxx
blob: 259de2695544b4d5431e3ea4a44731f05f69cac6 (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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
// file      : libbuild2/filesystem.cxx -*- C++ -*-
// license   : MIT; see accompanying LICENSE file

#include <libbuild2/filesystem.hxx>

#include <libbuild2/context.hxx>
#include <libbuild2/diagnostics.hxx>

using namespace std;
using namespace butl;

namespace build2
{
  void
  touch (context& ctx, const path& p, bool create, uint16_t v)
  {
    if (verb >= v)
      text << "touch " << p;

    if (ctx.dry_run)
      return;

    try
    {
      touch_file (p, create);
    }
    catch (const system_error& e)
    {
      fail << "unable to touch file " << p << ": " << e << endf;
    }
  }

  timestamp
  mtime (const char* p)
  {
    try
    {
      return file_mtime (p);
    }
    catch (const system_error& e)
    {
      fail << "unable to obtain file " << p << " modification time: " << e
           << endf;
    }
  }

  fs_status<mkdir_status>
  mkdir (const dir_path& d, uint16_t v)
  {
    // We don't want to print the command if the directory already exists.
    // This makes the below code a bit ugly.
    //
    mkdir_status ms;

    try
    {
      ms = try_mkdir (d);
    }
    catch (const system_error& e)
    {
      if (verb >= v)
        text << "mkdir " << d;

      fail << "unable to create directory " << d << ": " << e << endf;
    }

    if (ms == mkdir_status::success)
    {
      if (verb >= v)
        text << "mkdir " << d;
    }

    return ms;
  }

  fs_status<mkdir_status>
  mkdir_p (const dir_path& d, uint16_t v)
  {
    // We don't want to print the command if the directory already exists.
    // This makes the below code a bit ugly.
    //
    mkdir_status ms;

    try
    {
      ms = try_mkdir_p (d);
    }
    catch (const system_error& e)
    {
      if (verb >= v)
        text << "mkdir -p " << d;

      fail << "unable to create directory " << d << ": " << e << endf;
    }

    if (ms == mkdir_status::success)
    {
      if (verb >= v)
        text << "mkdir -p " << d;
    }

    return ms;
  }

  fs_status<rmfile_status>
  rmsymlink (context& ctx, const path& p, bool d, uint16_t v)
  {
    auto print = [&p, v] ()
    {
      if (verb >= v)
        text << "rm " << p.string ();
    };

    rmfile_status rs;

    try
    {
      rs = ctx.dry_run
        ? (butl::entry_exists (p)
           ? rmfile_status::success
           : rmfile_status::not_exist)
        : try_rmsymlink (p, d);
    }
    catch (const system_error& e)
    {
      print ();
      fail << "unable to remove symlink " << p.string () << ": " << e << endf;
    }

    if (rs == rmfile_status::success)
      print ();

    return rs;
  }

  fs_status<butl::rmdir_status>
  rmdir_r (context& ctx, const dir_path& d, bool dir, uint16_t v)
  {
    using namespace butl;

    if (work.sub (d)) // Don't try to remove working directory.
      return rmdir_status::not_empty;

    if (!build2::entry_exists (d))
      return rmdir_status::not_exist;

    if (verb >= v)
      text << "rmdir -r " << d;

    if (!ctx.dry_run)
    {
      try
      {
        butl::rmdir_r (d, dir);
      }
      catch (const system_error& e)
      {
        fail << "unable to remove directory " << d << ": " << e;
      }
    }

    return rmdir_status::success;
  }

  bool
  exists (const path& f, bool fs, bool ie)
  {
    try
    {
      return file_exists (f, fs, ie);
    }
    catch (const system_error& e)
    {
      fail << "unable to stat path " << f << ": " << e << endf;
    }
  }

  bool
  exists (const dir_path& d, bool ie)
  {
    try
    {
      return dir_exists (d, ie);
    }
    catch (const system_error& e)
    {
      fail << "unable to stat path " << d << ": " << e << endf;
    }
  }

  bool
  entry_exists (const path& p, bool fs, bool ie)
  {
    try
    {
      return butl::entry_exists (p, fs, ie);
    }
    catch (const system_error& e)
    {
      fail << "unable to stat path " << p << ": " << e << endf;
    }
  }

  bool
  empty (const dir_path& d)
  {
    try
    {
      return dir_empty (d);
    }
    catch (const system_error& e)
    {
      fail << "unable to scan directory " << d << ": " << e << endf;
    }
  }

  fs_status<mkdir_status>
  mkdir_buildignore (context& ctx,
                     const dir_path& d,
                     const path& n,
                     uint16_t verbosity)
  {
    fs_status<mkdir_status> r (mkdir (d, verbosity));

    // Create the .buildignore file if the directory was created (and so is
    // empty) or the file doesn't exist.
    //
    path p (d / n);
    if (r || !exists (p))
      touch (ctx, p, true /* create */, verbosity);

    return r;
  }

  bool
  empty_buildignore (const dir_path& d, const path& n)
  {
    try
    {
      for (const dir_entry& de: dir_iterator (d, false /* ignore_dangling */))
      {
        // The .buildignore filesystem entry should be of the regular file
        // type.
        //
        if (de.path () != n || de.ltype () != entry_type::regular)
          return false;
      }
    }
    catch (const system_error& e)
    {
      fail << "unable to scan directory " << d << ": " << e;
    }

    return true;
  }

  fs_status<rmdir_status>
  rmdir_buildignore (context& ctx,
                     const dir_path& d,
                     const path& n,
                     uint16_t verbosity)
  {
    // We should remove the .buildignore file only if the subsequent rmdir()
    // will succeed. In other words if the directory stays after the function
    // call then the .buildignore file must stay also, if present. Thus, we
    // first check that the directory is otherwise empty and doesn't contain
    // the working directory.
    //
    path p (d / n);
    if (exists (p) && empty_buildignore (d, n) && !work.sub (d))
      rmfile (ctx, p, verbosity);

    // Note that in case of a system error the directory is likely to stay with
    // the .buildignore file already removed. Trying to restore it feels like
    // an overkill here.
    //
    return rmdir (ctx, d, verbosity);
  }
}