mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-30 06:03:49 +08:00
434 lines
9.9 KiB
C++
434 lines
9.9 KiB
C++
#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <libgen.h>
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#include "fallback.h"
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#include "util.h"
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#include "common.h"
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#include "env.h"
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#include "wutil.h"
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#include "path.h"
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#include "expand.h"
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/**
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Unexpected error in path_get_path()
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*/
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#define MISSING_COMMAND_ERR_MSG _( L"Error while searching for command '%ls'" )
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static bool path_get_path_core(const wcstring &cmd, wcstring *out_path, const env_var_t &bin_path_var)
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{
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int err = ENOENT;
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debug( 3, L"path_get_path( '%ls' )", cmd.c_str() );
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/* If the command has a slash, it must be a full path */
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if (cmd.find(L'/') != wcstring::npos)
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{
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if( waccess( cmd, X_OK )==0 )
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{
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struct stat buff;
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if(wstat( cmd, &buff ))
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{
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return false;
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}
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if( S_ISREG(buff.st_mode) )
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{
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if (out_path)
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out_path->assign(cmd);
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return true;
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}
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else
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{
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errno = EACCES;
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return false;
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}
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}
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else
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{
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struct stat buff;
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wstat( cmd, &buff );
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return false;
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}
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}
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else
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{
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wcstring bin_path;
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if (! bin_path_var.missing())
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{
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bin_path = bin_path_var;
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}
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else
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{
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if (contains( PREFIX L"/bin", L"/bin", L"/usr/bin" ))
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{
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bin_path = L"/bin" ARRAY_SEP_STR L"/usr/bin";
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}
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else
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{
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bin_path = L"/bin" ARRAY_SEP_STR L"/usr/bin" ARRAY_SEP_STR PREFIX L"/bin";
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}
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}
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wcstring nxt_path;
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wcstokenizer tokenizer(bin_path, ARRAY_SEP_STR);
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while (tokenizer.next(nxt_path))
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{
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if (nxt_path.empty())
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continue;
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append_path_component(nxt_path, cmd);
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if( waccess( nxt_path, X_OK )==0 )
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{
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struct stat buff;
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if( wstat( nxt_path, &buff )==-1 )
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{
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if( errno != EACCES )
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{
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wperror( L"stat" );
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}
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continue;
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}
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if( S_ISREG(buff.st_mode) )
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{
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if (out_path)
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out_path->swap(nxt_path);
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return true;
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}
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err = EACCES;
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}
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else
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{
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switch( errno )
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{
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case ENOENT:
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case ENAMETOOLONG:
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case EACCES:
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case ENOTDIR:
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break;
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default:
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{
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debug( 1,
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MISSING_COMMAND_ERR_MSG,
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nxt_path.c_str() );
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wperror( L"access" );
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}
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}
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}
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}
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}
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errno = err;
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return false;
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}
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bool path_get_path(const wcstring &cmd, wcstring *out_path, const env_vars_snapshot_t &vars)
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{
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return path_get_path_core(cmd, out_path, vars.get(L"PATH"));
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}
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bool path_get_path(const wcstring &cmd, wcstring *out_path)
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{
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return path_get_path_core(cmd, out_path, env_get_string(L"PATH"));
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}
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bool path_get_cdpath_string(const wcstring &dir_str, wcstring &result, const env_var_t &cdpath)
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{
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wchar_t *res = 0;
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int err = ENOENT;
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bool success = false;
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const wchar_t *const dir = dir_str.c_str();
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if( dir[0] == L'/'|| (wcsncmp( dir, L"./", 2 )==0) )
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{
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struct stat buf;
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if( wstat( dir, &buf ) == 0 )
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{
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if( S_ISDIR(buf.st_mode) )
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{
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result = dir_str;
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success = true;
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}
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else
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{
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err = ENOTDIR;
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}
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}
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}
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else
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{
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wcstring path = L".";
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// Respect CDPATH
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env_var_t cdpath = env_get_string(L"CDPATH");
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if (! cdpath.missing_or_empty()) {
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path = cdpath.c_str();
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}
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wcstokenizer tokenizer(path, ARRAY_SEP_STR);
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wcstring next_path;
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while (tokenizer.next(next_path))
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{
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expand_tilde(next_path);
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if (next_path.size() == 0) continue;
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wcstring whole_path = next_path;
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append_path_component(whole_path, dir);
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struct stat buf;
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if( wstat( whole_path, &buf ) == 0 )
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{
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if( S_ISDIR(buf.st_mode) )
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{
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result = whole_path;
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success = true;
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break;
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}
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else
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{
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err = ENOTDIR;
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}
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}
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else
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{
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if( lwstat( whole_path, &buf ) == 0 )
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{
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err = EROTTEN;
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}
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}
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}
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}
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if( !success )
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{
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errno = err;
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}
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return res;
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}
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bool path_get_cdpath(const wcstring &dir, wcstring *out, const wchar_t *wd, const env_vars_snapshot_t &env_vars)
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{
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int err = ENOENT;
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if (dir.empty())
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return false;
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if (wd)
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{
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size_t len = wcslen(wd);
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assert(wd[len - 1] == L'/');
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}
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wcstring_list_t paths;
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if (dir.at(0) == L'/') {
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/* Absolute path */
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paths.push_back(dir);
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} else if (string_prefixes_string(L"./", dir) ||
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string_prefixes_string(L"../", dir) ||
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dir == L"." || dir == L"..") {
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/* Path is relative to the working directory */
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wcstring path;
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if (wd)
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path.append(wd);
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path.append(dir);
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paths.push_back(path);
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} else {
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// Respect CDPATH
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env_var_t path = env_vars.get(L"CDPATH");
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if (path.missing_or_empty())
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path = L"."; //We'll change this to the wd if we have one
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wcstring nxt_path;
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wcstokenizer tokenizer(path, ARRAY_SEP_STR);
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while (tokenizer.next(nxt_path))
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{
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if (nxt_path == L"." && wd != NULL) {
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// nxt_path is just '.', and we have a working directory, so use the wd instead
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// TODO: if nxt_path starts with ./ we need to replace the . with the wd
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nxt_path = wd;
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}
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expand_tilde(nxt_path);
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// debug( 2, L"woot %ls\n", expanded_path.c_str() );
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if (nxt_path.empty())
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continue;
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wcstring whole_path = nxt_path;
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append_path_component(whole_path, dir);
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paths.push_back(whole_path);
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}
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}
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bool success = false;
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for (wcstring_list_t::const_iterator iter = paths.begin(); iter != paths.end(); ++iter) {
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struct stat buf;
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const wcstring &dir = *iter;
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if( wstat( dir, &buf ) == 0 )
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{
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if( S_ISDIR(buf.st_mode) )
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{
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success = true;
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if (out)
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out->assign(dir);
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break;
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}
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else
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{
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err = ENOTDIR;
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}
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}
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}
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if (! success)
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errno = err;
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return success;
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}
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bool path_can_be_implicit_cd(const wcstring &path, wcstring *out_path, const wchar_t *wd, const env_vars_snapshot_t &vars)
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{
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wcstring exp_path = path;
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expand_tilde(exp_path);
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bool result = false;
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if (string_prefixes_string(L"/", exp_path) ||
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string_prefixes_string(L"./", exp_path) ||
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string_prefixes_string(L"../", exp_path) ||
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exp_path == L"..")
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{
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/* These paths can be implicit cd, so see if you cd to the path. Note that a single period cannot (that's used for sourcing files anyways) */
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result = path_get_cdpath(exp_path, out_path, wd, vars);
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}
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return result;
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}
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bool path_get_config(wcstring &path)
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{
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int done = 0;
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wcstring res;
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const env_var_t xdg_dir = env_get_string( L"XDG_CONFIG_HOME" );
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if( ! xdg_dir.missing() )
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{
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res = xdg_dir + L"/fish";
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if( !create_directory( res ) )
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{
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done = 1;
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}
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}
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else
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{
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const env_var_t home = env_get_string( L"HOME" );
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if( ! home.missing() )
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{
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res = home + L"/.config/fish";
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if( !create_directory( res ) )
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{
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done = 1;
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}
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}
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}
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if( done )
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{
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path = res;
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return true;
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}
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else
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{
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debug( 0, _(L"Unable to create a configuration directory for fish. Your personal settings will not be saved. Please set the $XDG_CONFIG_HOME variable to a directory where the current user has write access." ));
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return false;
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}
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}
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static void replace_all(wcstring &str, const wchar_t *needle, const wchar_t *replacement)
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{
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size_t needle_len = wcslen(needle);
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size_t offset = 0;
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while((offset = str.find(needle, offset)) != wcstring::npos)
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{
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str.replace(offset, needle_len, replacement);
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offset += needle_len;
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}
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}
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void path_make_canonical( wcstring &path )
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{
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/* Remove double slashes */
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size_t size;
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do {
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size = path.size();
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replace_all(path, L"//", L"/");
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} while (path.size() != size);
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/* Remove trailing slashes, except don't remove the first one */
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while (size-- > 1) {
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if (path.at(size) != L'/')
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break;
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}
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/* Now size is either -1 (if the entire string was slashes) or is the index of the last non-slash character. Either way this will set it to the correct size. */
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path.resize(size+1);
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}
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bool path_is_valid(const wcstring &path, const wcstring &working_directory)
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{
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bool path_is_valid;
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/* Some special paths are always valid */
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if (path.empty()) {
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path_is_valid = false;
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} else if (path == L"." || path == L"./") {
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path_is_valid = true;
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} else if (path == L".." || path == L"../") {
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path_is_valid = (! working_directory.empty() && working_directory != L"/");
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} else if (path.at(0) != '/') {
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/* Prepend the working directory. Note that we know path is not empty here. */
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wcstring tmp = working_directory;
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tmp.append(path);
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path_is_valid = (0 == waccess(tmp, F_OK));
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} else {
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/* Simple check */
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path_is_valid = (0 == waccess(path, F_OK));
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}
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return path_is_valid;
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}
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bool paths_are_same_file(const wcstring &path1, const wcstring &path2) {
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if (path1 == path2)
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return true;
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struct stat s1, s2;
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if (wstat(path1, &s1) == 0 && wstat(path2, &s2) == 0) {
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return s1.st_ino == s2.st_ino && s1.st_dev == s2.st_dev;
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} else {
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return false;
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}
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}
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wcstring get_working_directory(void) {
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wcstring wd = L"./";
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wchar_t dir_path[4096];
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const wchar_t *cwd = wgetcwd( dir_path, 4096 );
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if (cwd) {
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wd = cwd;
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/* Make sure the working directory ends with a slash */
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if (! wd.empty() && wd.at(wd.size() - 1) != L'/')
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wd.push_back(L'/');
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}
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return wd;
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}
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