/home/andy/git/oilshell/oil/cpp/leaky_osh.cc

Source (jump to first uncovered line)
// leaky_osh.cc

#include "cpp/leaky_osh.h"

#include <fcntl.h>  // AT_* Constants
#include <sys/stat.h>
#include <unistd.h>

#include "cpp/leaky_core_error.h"
#include "cpp/leaky_core_pyerror.h"
#include "mycpp/builtins.h"

namespace arith_parse {

tdop::ParserSpec kArithSpec;

}  // namespace arith_parse

namespace Id = id_kind_asdl::Id;  // used below

namespace bool_stat {

bool isatty(Str* fd_str, word_t* blame_word) {
  int fd;
  try {
    fd = to_int(fd_str);
  } catch (ValueError* e) {
    // Note we don't have printf formatting here
    e_die(StrFromC("Invalid file descriptor TODO"), blame_word);
  }
  // note: we don't check errno
  int result = ::isatty(fd);
  return result;
}

bool DoUnaryOp(Id_t op_id, Str* s) {
  const char* zPath = s->data_;

  if (op_id == Id::BoolUnary_h || op_id == Id::BoolUnary_L) {
    struct stat st;
    if (lstat(zPath, &st) < 0) {
      return false;
    }

    return S_ISLNK(st.st_mode);
  } else {
    struct stat st;
    if (stat(zPath, &st) < 0) {
      return false;
    }

    auto mode = st.st_mode;

    switch (op_id) {
    // synonyms for existence
    case Id::BoolUnary_a:
    case Id::BoolUnary_e:
      return true;

    case Id::BoolUnary_s:
      return st.st_size != 0;

    case Id::BoolUnary_d:
      return S_ISDIR(mode);

    case Id::BoolUnary_f:
      return S_ISREG(mode);

    case Id::BoolUnary_k:
      return (mode & S_ISVTX) != 0;

    case Id::BoolUnary_p:
      return S_ISFIFO(mode);

    case Id::BoolUnary_O:
      return st.st_uid == geteuid();

    case Id::BoolUnary_G:
      return st.st_gid == getegid();

    case Id::BoolUnary_u:
      return mode & S_ISUID;

    case Id::BoolUnary_g:
      return mode & S_ISGID;

      // NOTE(Jesse): This implementation MAY have a bug.  On my system (Ubuntu
      // 20.04) it returns a correct result if the user is root (elevated with
      // sudo) and no execute bits are set for a file.
      //
      // A bug worked around in the python `posix` module here is that the above
      // (working) scenario is not always the case.
      //
      // https://github.com/python/cpython/blob/8d999cbf4adea053be6dbb612b9844635c4dfb8e/Modules/posixmodule.c#L2547
      //
      // As well as the dash source code found here (relative to this repo
      // root):
      //
      // _cache/spec-bin/dash-0.5.10.2/src/bltin/test.c
      // See `test_file_access()`
      //
      // We could also use the `stat` struct to manually compute the
      // permissions, as shown in the above `test.c`, though the code is
      // somewhat obtuse.
      //
      // There is further discussion of this issue in:
      // https://github.com/oilshell/oil/pull/1168
      //
      // And a bug filed for it at:
      //
      // https://github.com/oilshell/oil/issues/1170
      //
    case Id::BoolUnary_x:
      return faccessat(AT_FDCWD, zPath, X_OK, AT_EACCESS) == 0;
      //

    case Id::BoolUnary_r:
      return faccessat(AT_FDCWD, zPath, R_OK, AT_EACCESS) == 0;

    case Id::BoolUnary_w:
      return faccessat(AT_FDCWD, zPath, W_OK, AT_EACCESS) == 0;
    }
  }

  InvalidCodePath();

  return false;
}

bool DoBinaryOp(Id_t op_id, Str* s1, Str* s2) {
  int m1 = 0;
  struct stat st1;
  if (stat(s1->data_, &st1) == 0) {
    m1 = st1.st_mtime;
  }

  int m2 = 0;
  struct stat st2;
  if (stat(s2->data_, &st2) == 0) {
    m2 = st2.st_mtime;
  }

  switch (op_id) {
  case Id::BoolBinary_nt:
    return m1 > m2;
  case Id::BoolBinary_ot:
    return m1 < m2;
  case Id::BoolBinary_ef:
    return st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino;
  }

  InvalidCodePath();
}

}  // namespace bool_stat

cpp

Coverage Report

Created: 2022-09-21 22:22

Line	Count	Source (jump to first uncovered line)
1		// leaky_osh.cc
2
3		#include "cpp/leaky_osh.h"
4
5		#include <fcntl.h> // AT_* Constants
6		#include <sys/stat.h>
7		#include <unistd.h>
8
9		#include "cpp/leaky_core_error.h"
10		#include "cpp/leaky_core_pyerror.h"
11		#include "mycpp/builtins.h"
12
13		namespace arith_parse {
14
15		tdop::ParserSpec kArithSpec;
16
17		} // namespace arith_parse
18
19		namespace Id = id_kind_asdl::Id; // used below
20
21		namespace bool_stat {
22
23	2	bool isatty(Str* fd_str, word_t* blame_word) {
24	2	int fd;
25	2	try {
26	2	fd = to_int(fd_str);
27	2	} catch (ValueError* e) {
28		// Note we don't have printf formatting here
29	1	e_die(StrFromC("Invalid file descriptor TODO"), blame_word);
30	1	}
31		// note: we don't check errno
32	2	int result = ::isatty(fd);
33	1	return result;
34	2	}
35
36	0	bool DoUnaryOp(Id_t op_id, Str* s) {
37	0	const char* zPath = s->data_;
38
39	0	if (op_id == Id::BoolUnary_h \|\| op_id == Id::BoolUnary_L) {
40	0	struct stat st;
41	0	if (lstat(zPath, &st) < 0) {
42	0	return false;
43	0	}
44
45	0	return S_ISLNK(st.st_mode);
46	0	} else {
47	0	struct stat st;
48	0	if (stat(zPath, &st) < 0) {
49	0	return false;
50	0	}
51
52	0	auto mode = st.st_mode;
53
54	0	switch (op_id) {
55		// synonyms for existence
56	0	case Id::BoolUnary_a:
57	0	case Id::BoolUnary_e:
58	0	return true;
59
60	0	case Id::BoolUnary_s:
61	0	return st.st_size != 0;
62
63	0	case Id::BoolUnary_d:
64	0	return S_ISDIR(mode);
65
66	0	case Id::BoolUnary_f:
67	0	return S_ISREG(mode);
68
69	0	case Id::BoolUnary_k:
70	0	return (mode & S_ISVTX) != 0;
71
72	0	case Id::BoolUnary_p:
73	0	return S_ISFIFO(mode);
74
75	0	case Id::BoolUnary_O:
76	0	return st.st_uid == geteuid();
77
78	0	case Id::BoolUnary_G:
79	0	return st.st_gid == getegid();
80
81	0	case Id::BoolUnary_u:
82	0	return mode & S_ISUID;
83
84	0	case Id::BoolUnary_g:
85	0	return mode & S_ISGID;
86
87		// NOTE(Jesse): This implementation MAY have a bug. On my system (Ubuntu
88		// 20.04) it returns a correct result if the user is root (elevated with
89		// sudo) and no execute bits are set for a file.
90		//
91		// A bug worked around in the python `posix` module here is that the above
92		// (working) scenario is not always the case.
93		//
94		// https://github.com/python/cpython/blob/8d999cbf4adea053be6dbb612b9844635c4dfb8e/Modules/posixmodule.c#L2547
95		//
96		// As well as the dash source code found here (relative to this repo
97		// root):
98		//
99		// _cache/spec-bin/dash-0.5.10.2/src/bltin/test.c
100		// See `test_file_access()`
101		//
102		// We could also use the `stat` struct to manually compute the
103		// permissions, as shown in the above `test.c`, though the code is
104		// somewhat obtuse.
105		//
106		// There is further discussion of this issue in:
107		// https://github.com/oilshell/oil/pull/1168
108		//
109		// And a bug filed for it at:
110		//
111		// https://github.com/oilshell/oil/issues/1170
112		//
113	0	case Id::BoolUnary_x:
114	0	return faccessat(AT_FDCWD, zPath, X_OK, AT_EACCESS) == 0;
115		//
116
117	0	case Id::BoolUnary_r:
118	0	return faccessat(AT_FDCWD, zPath, R_OK, AT_EACCESS) == 0;
119
120	0	case Id::BoolUnary_w:
121	0	return faccessat(AT_FDCWD, zPath, W_OK, AT_EACCESS) == 0;
122	0	}
123	0	}
124
125	0	InvalidCodePath();
126
127	0	return false;
128	0	}
129
130	0	bool DoBinaryOp(Id_t op_id, Str* s1, Str* s2) {
131	0	int m1 = 0;
132	0	struct stat st1;
133	0	if (stat(s1->data_, &st1) == 0) {
134	0	m1 = st1.st_mtime;
135	0	}
136
137	0	int m2 = 0;
138	0	struct stat st2;
139	0	if (stat(s2->data_, &st2) == 0) {
140	0	m2 = st2.st_mtime;
141	0	}
142
143	0	switch (op_id) {
144	0	case Id::BoolBinary_nt:
145	0	return m1 > m2;
146	0	case Id::BoolBinary_ot:
147	0	return m1 < m2;
148	0	case Id::BoolBinary_ef:
149	0	return st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino;
150	0	}
151
152	0	InvalidCodePath();
153	0	}
154
155		} // namespace bool_stat