mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
1080 lines
25 KiB
C
1080 lines
25 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2015.
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This file is part of Tix.
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Tix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Tix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Tix. If not, see <https://www.gnu.org/licenses/>.
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util.h
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Shared Utility functions for Tix.
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*******************************************************************************/
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#ifndef UTIL_H
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#define UTIL_H
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// TODO: After releasing Sortix 1.0, remove this ifdef and default it to the
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// latest generation.
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#if defined(__sortix__)
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#define DEFAULT_GENERATION "2"
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#else
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#define DEFAULT_GENERATION "1"
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#endif
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bool does_path_contain_dotdot(const char* path)
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{
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size_t index = 0;
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while ( path[index] )
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{
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if ( path[index] == '.' && path[index+1] == '.' )
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{
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index += 2;
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if ( !path[index] || path[index] == '/' )
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return true;
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}
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while ( path[index] && path[index] != '/' )
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index++;
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while ( path[index] == '/' )
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index++;
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}
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return false;
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}
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bool parse_boolean(const char* str)
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{
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return strcmp(str, "true") == 0;
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}
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char* strdup_null(const char* src)
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{
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return src ? strdup(src) : NULL;
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}
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char* strdup_null_if_content(const char* src)
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{
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if ( src && !src[0] )
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return NULL;
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return strdup_null(src);
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}
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const char* non_modify_basename(const char* path)
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{
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const char* last_slash = (char*) strrchr((char*) path, '/');
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if ( !last_slash )
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return path;
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return last_slash + 1;
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}
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typedef struct
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{
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char** strings;
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size_t length;
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size_t capacity;
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} string_array_t;
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string_array_t string_array_make()
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{
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string_array_t sa;
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sa.strings = NULL;
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sa.length = sa.capacity = 0;
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return sa;
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}
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void string_array_reset(string_array_t* sa)
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{
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for ( size_t i = 0; i < sa->length; i++ )
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free(sa->strings[i]);
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free(sa->strings);
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*sa = string_array_make();
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}
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bool string_array_append(string_array_t* sa, const char* str)
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{
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if ( sa->length == sa->capacity )
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{
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size_t new_capacity = sa->capacity ? sa->capacity * 2 : 8;
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size_t new_size = sizeof(char*) * new_capacity;
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char** new_strings = (char**) realloc(sa->strings, new_size);
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if ( !new_strings )
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return false;
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sa->strings = new_strings;
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sa->capacity = new_capacity;
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}
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char* copy = strdup_null(str);
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if ( str && !copy )
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return false;
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sa->strings[sa->length++] = copy;
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return true;
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}
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bool string_array_append_token_string(string_array_t* sa, const char* str)
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{
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while ( *str )
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{
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if ( isspace((unsigned char) *str) )
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{
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str++;
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continue;
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}
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size_t input_length = 0;
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size_t output_length = 0;
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bool quoted = false;
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bool escaped = false;
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while ( str[input_length] &&
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(escaped || quoted || !isspace((unsigned char) str[input_length])) )
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{
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if ( !escaped && str[input_length] == '\\' )
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escaped = true;
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else if ( !escaped && str[input_length] == '"' )
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quoted = !quoted;
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else
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escaped = false, output_length++;
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input_length++;
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}
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if ( quoted || escaped )
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return false;
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char* output = (char*) malloc(sizeof(char) * (output_length+1));
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if ( !output )
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return false;
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input_length = 0;
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output_length = 0;
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quoted = false;
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escaped = false;
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while ( str[input_length] &&
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(escaped || quoted || !isspace((unsigned char) str[input_length])) )
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{
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if ( !escaped && str[input_length] == '\\' )
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escaped = true;
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else if ( !escaped && str[input_length] == '"' )
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quoted = !quoted;
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else if ( escaped && str[input_length] == 'a' )
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escaped = false, output[output_length++] = '\a';
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else if ( escaped && str[input_length] == 'b' )
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escaped = false, output[output_length++] = '\b';
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else if ( escaped && str[input_length] == 'e' )
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escaped = false, output[output_length++] = '\e';
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else if ( escaped && str[input_length] == 'f' )
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escaped = false, output[output_length++] = '\f';
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else if ( escaped && str[input_length] == 'n' )
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escaped = false, output[output_length++] = '\n';
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else if ( escaped && str[input_length] == 'r' )
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escaped = false, output[output_length++] = '\r';
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else if ( escaped && str[input_length] == 't' )
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escaped = false, output[output_length++] = '\t';
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else if ( escaped && str[input_length] == 'v' )
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escaped = false, output[output_length++] = '\v';
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else
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escaped = false, output[output_length++] = str[input_length];
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input_length++;
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}
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output[output_length] = '\0';
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if ( !string_array_append(sa, output) )
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{
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free(output);
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return false;
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}
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free(output);
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str += input_length;
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}
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return true;
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}
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bool is_token_string_special_character(char c)
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{
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return isspace((unsigned char) c) || c == '"' || c == '\\';
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}
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char* token_string_of_string_array(const string_array_t* sa)
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{
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size_t result_length = 0;
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for ( size_t i = 0; i < sa->length; i++ )
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{
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if ( i )
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result_length++;
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for ( size_t n = 0; sa->strings[i][n]; n++ )
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{
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if ( is_token_string_special_character(sa->strings[i][n]) )
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result_length++;
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result_length++;
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}
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}
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char* result = (char*) malloc(sizeof(char) * (result_length + 1));
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if ( !result )
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return NULL;
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result_length = 0;
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for ( size_t i = 0; i < sa->length; i++ )
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{
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if ( i )
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result[result_length++] = ' ';
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for ( size_t n = 0; sa->strings[i][n]; n++ )
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{
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if ( is_token_string_special_character(sa->strings[i][n]) )
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result[result_length++] = '\\';
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result[result_length++] = sa->strings[i][n];
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}
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}
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result[result_length] = '\0';
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return result;
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}
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void string_array_append_file(string_array_t* sa, FILE* fp)
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{
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char* entry = NULL;
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size_t entry_size = 0;
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ssize_t entry_length;
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while ( 0 < (entry_length = getline(&entry, &entry_size, fp)) )
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{
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if ( entry_length && entry[entry_length-1] == '\n' )
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entry[entry_length-1] = '\0';
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string_array_append(sa, entry);
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}
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free(entry);
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}
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bool string_array_append_file_path(string_array_t* sa, const char* path)
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{
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FILE* fp = fopen(path, "r");
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if ( !fp )
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return false;
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string_array_append_file(sa, fp);
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fclose(fp);
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return true;
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}
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size_t string_array_find(string_array_t* sa, const char* str)
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{
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for ( size_t i = 0; i < sa->length; i++ )
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if ( !strcmp(sa->strings[i], str) )
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return i;
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return SIZE_MAX;
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}
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bool string_array_contains(string_array_t* sa, const char* str)
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{
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return string_array_find(sa, str) != SIZE_MAX;
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}
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size_t dictionary_lookup_index(string_array_t* sa, const char* key)
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{
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size_t keylen = strlen(key);
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for ( size_t i = 0; i < sa->length; i++ )
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{
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const char* entry = sa->strings[i];
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if ( strncmp(key, entry, keylen) != 0 )
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continue;
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if ( entry[keylen] != '=' )
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continue;
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return i;
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}
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return SIZE_MAX;
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}
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const char* dictionary_get_entry(string_array_t* sa, const char* key)
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{
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size_t index = dictionary_lookup_index(sa, key);
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if ( index == SIZE_MAX )
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return NULL;
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return sa->strings[index];
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}
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const char* dictionary_get(string_array_t* sa, const char* key,
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const char* def = NULL)
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{
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size_t keylen = strlen(key);
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const char* entry = dictionary_get_entry(sa, key);
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return entry ? entry + keylen + 1 : def;
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}
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void dictionary_normalize_entry(char* entry)
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{
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bool key = true;
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size_t input_off, output_off;
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for ( input_off = output_off = 0; entry[input_off]; input_off++ )
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{
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if ( key && isspace((unsigned char) entry[input_off]) )
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continue;
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if ( key && (entry[input_off] == '=' || entry[input_off] == '#') )
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key = false;
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entry[output_off++] = entry[input_off];
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}
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entry[output_off] = '\0';
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}
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void dictionary_append_file(string_array_t* sa, FILE* fp)
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{
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char* entry = NULL;
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size_t entry_size = 0;
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ssize_t entry_length;
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while ( 0 < (entry_length = getline(&entry, &entry_size, fp)) )
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{
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if ( entry_length && entry[entry_length-1] == '\n' )
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entry[entry_length-1] = '\0';
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dictionary_normalize_entry(entry);
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if ( entry[0] == '#' )
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continue;
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string_array_append(sa, entry);
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}
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free(entry);
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}
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bool dictionary_append_file_path(string_array_t* sa, const char* path)
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{
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FILE* fp = fopen(path, "r");
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if ( !fp )
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return false;
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dictionary_append_file(sa, fp);
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fclose(fp);
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return true;
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}
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__attribute__((format(printf, 1, 2)))
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char* print_string(const char* format, ...)
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{
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va_list ap;
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va_start(ap, format);
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char* ret;
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if ( vasprintf(&ret, format, ap) < 0 )
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ret = NULL;
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va_end(ap);
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return ret;
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}
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char* read_single_line(FILE* fp)
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{
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char* ret = NULL;
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size_t ret_size = 0;
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ssize_t ret_len = getline(&ret, &ret_size, fp);
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if ( ret_len < 0 )
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{
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free(ret);
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return NULL;
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}
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if ( ret_len && ret[ret_len-1] == '\n' )
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ret[ret_len-1] = '\0';
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return ret;
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}
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pid_t fork_or_death()
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{
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pid_t child_pid = fork();
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if ( child_pid < 0 )
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error(1, errno, "fork");
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return child_pid;
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}
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void waitpid_or_death(pid_t child_pid, bool die_on_error = true)
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{
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int status;
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waitpid(child_pid, &status, 0);
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if ( die_on_error )
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{
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if ( WIFEXITED(status) && WEXITSTATUS(status) != 0 )
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exit(WEXITSTATUS(status));
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if ( WIFSIGNALED(status) )
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error(128 + WTERMSIG(status), 0, "child with pid %ju was killed by "
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"signal %i (%s).", (uintmax_t) child_pid, WTERMSIG(status),
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strsignal(WTERMSIG(status)));
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}
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}
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bool fork_and_wait_or_death(bool die_on_error = true)
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{
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pid_t child_pid = fork_or_death();
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if ( !child_pid )
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return true;
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waitpid_or_death(child_pid, die_on_error);
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return false;
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}
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const char* getenv_def(const char* var, const char* def)
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{
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const char* ret = getenv(var);
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return ret ? ret : def;
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}
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int mkdir_p(const char* path, mode_t mode)
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{
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int saved_errno = errno;
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if ( mkdir(path, mode) != 0 && errno != EEXIST )
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return -1;
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errno = saved_errno;
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return 0;
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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char* GetBuildTriplet()
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{
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#if defined(__sortix__) && defined(__i386__)
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return strdup("i486-sortix");
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#elif defined(__sortix__) && defined(__x86_64__)
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return strdup("x86_64-sortix");
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#elif defined(__sortix__)
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#warning "Add your build triplet here"
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#endif
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FILE* fp = popen("cc -dumpmachine", "r");
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if ( !fp )
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return NULL;
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char* ret = read_single_line(fp);
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pclose(fp);
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return ret;
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}
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bool get_option_variable(const char* option, char** varptr,
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const char* arg, int argc, char** argv, int* ip,
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const char* argv0)
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{
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size_t option_len = strlen(option);
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if ( strncmp(option, arg, option_len) != 0 )
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return false;
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if ( arg[option_len] == '=' )
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{
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*varptr = strdup(arg + option_len + 1);
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return true;
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}
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if ( arg[option_len] != '\0' )
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return false;
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if ( *ip + 1 == argc )
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{
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fprintf(stderr, "%s: expected operand after `%s'\n", argv0, option);
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exit(1);
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}
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*varptr = strdup(argv[++*ip]), argv[*ip] = NULL;
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return true;
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}
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char* join_paths(const char* a, const char* b)
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{
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size_t a_len = strlen(a);
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bool has_slash = (a_len && a[a_len-1] == '/') || b[0] == '/';
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return has_slash ? print_string("%s%s", a, b) : print_string("%s/%s", a, b);
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}
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bool IsFile(const char* path)
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{
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struct stat st;
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return stat(path, &st) == 0 && S_ISREG(st.st_mode);
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}
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bool IsDirectory(const char* path)
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{
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struct stat st;
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return stat(path, &st) == 0 &&
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(S_ISDIR(st.st_mode) || (errno = ENOTDIR, false));
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}
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size_t count_tar_components(const char* path)
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{
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if ( !*path )
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return 0;
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size_t slashes = 1;
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for ( size_t i = 0; path[i]; i++ )
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if ( path[i] == '/' )
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slashes++;
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return slashes;
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}
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#define GET_OPTION_VARIABLE(str, varptr) \
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get_option_variable(str, varptr, arg, argc, argv, &i, argv0)
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// TODO: This is a bit inefficient but doing it otherwise would involve looking
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// through the error stream for messages such as "file not found", which
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// can be hard to distinguish from the common "oh no, an error occured"
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// case in which we need to abort as well.
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bool TarContainsFile(const char* archive, const char* file)
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{
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int pipes[2];
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if ( pipe(pipes) )
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error(1, errno, "pipe");
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pid_t tar_pid = fork_or_death();
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if ( !tar_pid )
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{
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dup2(pipes[1], 1);
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close(pipes[1]);
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close(pipes[0]);
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const char* cmd_argv[] =
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{
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"tar",
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"--list",
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"--file", archive,
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NULL
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};
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execvp(cmd_argv[0], (char* const*) cmd_argv);
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error(127, errno, "%s", cmd_argv[0]);
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}
|
|
close(pipes[1]);
|
|
FILE* fp = fdopen(pipes[0], "r");
|
|
|
|
char* line = NULL;
|
|
size_t line_size = 0;
|
|
ssize_t line_len;
|
|
bool ret = false;
|
|
while ( 0 < (line_len = getline(&line, &line_size, fp)) )
|
|
{
|
|
if ( line_len && line[line_len-1] == '\n' )
|
|
line[--line_len] = '\0';
|
|
if ( strcmp(line, file) == 0 )
|
|
{
|
|
ret = true;
|
|
#if !defined(__sortix__)
|
|
kill(tar_pid, SIGPIPE);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
free(line);
|
|
|
|
fclose(fp);
|
|
int tar_exit_status;
|
|
waitpid(tar_pid, &tar_exit_status, 0);
|
|
bool sigpiped = WIFSIGNALED(tar_exit_status) &&
|
|
WTERMSIG(tar_exit_status) == SIGPIPE;
|
|
bool errored = !WIFEXITED(tar_exit_status) ||
|
|
WEXITSTATUS(tar_exit_status) != 0;
|
|
if ( errored && !sigpiped )
|
|
{
|
|
error(1, 0, "Unable to list contents of `%s'.", archive);
|
|
exit(WEXITSTATUS(tar_exit_status));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void TarExtractFileToFD(const char* archive, const char* file, int fd)
|
|
{
|
|
pid_t tar_pid = fork_or_death();
|
|
if ( !tar_pid )
|
|
{
|
|
if ( dup2(fd, 1) < 0 )
|
|
{
|
|
error(0, errno, "dup2");
|
|
_exit(127);
|
|
}
|
|
close(fd);
|
|
const char* cmd_argv[] =
|
|
{
|
|
"tar",
|
|
"--to-stdout",
|
|
"--extract",
|
|
"--file", archive,
|
|
"--", file,
|
|
NULL
|
|
};
|
|
execvp(cmd_argv[0], (char* const*) cmd_argv);
|
|
error(0, errno, "%s", cmd_argv[0]);
|
|
_exit(127);
|
|
}
|
|
int tar_exit_status;
|
|
waitpid(tar_pid, &tar_exit_status, 0);
|
|
if ( !WIFEXITED(tar_exit_status) || WEXITSTATUS(tar_exit_status) != 0 )
|
|
{
|
|
error(1, 0, "Unable to extract `%s/%s'", archive, file);
|
|
exit(WEXITSTATUS(tar_exit_status));
|
|
}
|
|
}
|
|
|
|
FILE* TarOpenFile(const char* archive, const char* file)
|
|
{
|
|
FILE* fp = tmpfile();
|
|
if ( !fp )
|
|
error(1, errno, "tmpfile");
|
|
TarExtractFileToFD(archive, file, fileno(fp));
|
|
if ( fseeko(fp, 0, SEEK_SET) < 0 )
|
|
error(1, errno, "fseeko(tmpfile(), 0, SEEK_SET)");
|
|
return fp;
|
|
}
|
|
|
|
void TarIndexToFD(const char* archive, int fd)
|
|
{
|
|
pid_t tar_pid = fork_or_death();
|
|
if ( !tar_pid )
|
|
{
|
|
if ( dup2(fd, 1) < 0 )
|
|
{
|
|
error(0, errno, "dup2");
|
|
_exit(127);
|
|
}
|
|
close(fd);
|
|
const char* cmd_argv[] =
|
|
{
|
|
"tar",
|
|
"--list",
|
|
"--file", archive,
|
|
NULL
|
|
};
|
|
execvp(cmd_argv[0], (char* const*) cmd_argv);
|
|
error(0, errno, "%s", cmd_argv[0]);
|
|
_exit(127);
|
|
}
|
|
int tar_exit_status;
|
|
waitpid(tar_pid, &tar_exit_status, 0);
|
|
if ( !WIFEXITED(tar_exit_status) || WEXITSTATUS(tar_exit_status) != 0 )
|
|
{
|
|
error(1, 0, "Unable to list contents of `%s'", archive);
|
|
exit(WEXITSTATUS(tar_exit_status));
|
|
}
|
|
}
|
|
|
|
FILE* TarOpenIndex(const char* archive)
|
|
{
|
|
FILE* fp = tmpfile();
|
|
if ( !fp )
|
|
error(1, errno, "tmpfile");
|
|
TarIndexToFD(archive, fileno(fp));
|
|
if ( fseeko(fp, 0, SEEK_SET) < 0 )
|
|
error(1, errno, "fseeko(tmpfile(), 0, SEEK_SET)");
|
|
return fp;
|
|
}
|
|
|
|
const char* VerifyInfoVariable(string_array_t* info, const char* var,
|
|
const char* path)
|
|
{
|
|
const char* ret = dictionary_get(info, var);
|
|
if ( !ret )
|
|
error(1, 0, "error: `%s': no `%s' variable declared", path, var);
|
|
return ret;
|
|
}
|
|
|
|
void VerifyTixInformation(string_array_t* tixinfo, const char* tix_path)
|
|
{
|
|
const char* tix_version = dictionary_get(tixinfo, "tix.version");
|
|
if ( !tix_version )
|
|
error(1, 0, "error: `%s': no `tix.version' variable declared",
|
|
tix_path);
|
|
if ( atoi(tix_version) != 1 )
|
|
error(1, 0, "error: `%s': tix version `%s' not supported", tix_path,
|
|
tix_version);
|
|
const char* tix_class = dictionary_get(tixinfo, "tix.class");
|
|
if ( !tix_class )
|
|
error(1, 0, "error: `%s': no `tix.class' variable declared", tix_path);
|
|
if ( !strcmp(tix_class, "srctix") )
|
|
error(1, 0, "error: `%s': this object is a source tix and needs to be "
|
|
"compiled into a binary tix prior to installation.",
|
|
tix_path);
|
|
if ( strcmp(tix_class, "tix") )
|
|
error(1, 0, "error: `%s': tix class `%s' is not `tix': this object is "
|
|
"not suitable for installation.", tix_path, tix_class);
|
|
if ( !(dictionary_get(tixinfo, "tix.platform")) )
|
|
error(1, 0, "error: `%s': no `tix.platform' variable declared", tix_path);
|
|
if ( !(dictionary_get(tixinfo, "pkg.name")) )
|
|
error(1, 0, "error: `%s': no `pkg.name' variable declared", tix_path);
|
|
}
|
|
|
|
bool IsCollectionPrefixRatherThanCommand(const char* arg)
|
|
{
|
|
return strchr(arg, '/') || !strcmp(arg, ".") || !strcmp(arg, "..");
|
|
}
|
|
|
|
void ParseOptionalCommandLineCollectionPrefix(char** collection, int* argcp,
|
|
char*** argvp)
|
|
{
|
|
if ( 2 <= *argcp && IsCollectionPrefixRatherThanCommand((*argvp)[1]) )
|
|
{
|
|
if ( !*collection )
|
|
{
|
|
free(*collection);
|
|
*collection = strdup((*argvp)[1]);
|
|
}
|
|
(*argvp)[1] = NULL;
|
|
compact_arguments(argcp, argvp);
|
|
}
|
|
else if ( !*collection )
|
|
{
|
|
*collection = strdup("/");
|
|
}
|
|
}
|
|
|
|
void VerifyCommandLineCollection(char** collection)
|
|
{
|
|
if ( !*collection )
|
|
error(1, 0, "error: you need to specify which tix collection to "
|
|
"administer using --collection or giving the prefix as the "
|
|
"first argument.");
|
|
|
|
if ( !**collection )
|
|
{
|
|
free(*collection);
|
|
*collection = strdup("/");
|
|
}
|
|
|
|
char* collection_rel = *collection;
|
|
if ( !(*collection = canonicalize_file_name(collection_rel)) )
|
|
error(1, errno, "canonicalize_file_name(`%s')", collection_rel);
|
|
free(collection_rel);
|
|
}
|
|
|
|
void VerifyTixCollectionConfiguration(string_array_t* info, const char* path)
|
|
{
|
|
const char* tix_version = dictionary_get(info, "tix.version");
|
|
if ( !tix_version )
|
|
error(1, 0, "error: `%s': no `tix.version' variable declared", path);
|
|
if ( atoi(tix_version) != 1 )
|
|
error(1, 0, "error: `%s': tix version `%s' not supported", path,
|
|
tix_version);
|
|
const char* tix_class = dictionary_get(info, "tix.class");
|
|
if ( !tix_class )
|
|
error(1, 0, "error: `%s': no `tix.class' variable declared", path);
|
|
if ( strcmp(tix_class, "collection") != 0 )
|
|
error(1, 0, "error: `%s': error: unexpected tix class `%s'.", path,
|
|
tix_class);
|
|
if ( !(dictionary_get(info, "collection.prefix")) )
|
|
error(1, 0, "error: `%s': no `collection.prefix' variable declared",
|
|
path);
|
|
if ( !(dictionary_get(info, "collection.platform")) )
|
|
error(1, 0, "error: `%s': no `collection.platform' variable declared",
|
|
path);
|
|
}
|
|
|
|
static pid_t original_pid;
|
|
|
|
__attribute__((constructor))
|
|
static void initialize_original_pid()
|
|
{
|
|
original_pid = getpid();
|
|
}
|
|
|
|
void cleanup_file_or_directory(int, void* path_ptr)
|
|
{
|
|
if ( original_pid != getpid() )
|
|
return;
|
|
pid_t pid = fork();
|
|
if ( pid < 0 )
|
|
{
|
|
error(0, errno, "fork");
|
|
return;
|
|
}
|
|
if ( pid == 0 )
|
|
{
|
|
const char* cmd_argv[] =
|
|
{
|
|
"rm",
|
|
"-rf",
|
|
"--",
|
|
(const char*) path_ptr,
|
|
NULL,
|
|
};
|
|
execvp(cmd_argv[0], (char* const*) cmd_argv);
|
|
error(0, errno, "%s", cmd_argv[0]);
|
|
_exit(127);
|
|
}
|
|
int code;
|
|
waitpid(pid, &code, 0);
|
|
}
|
|
|
|
mode_t get_umask_value()
|
|
{
|
|
mode_t result = umask(0);
|
|
umask(result);
|
|
return result;
|
|
}
|
|
|
|
int fchmod_plus_x(int fd)
|
|
{
|
|
struct stat st;
|
|
if ( fstat(fd, &st) != 0 )
|
|
return -1;
|
|
mode_t new_mode = st.st_mode | (0111 & ~get_umask_value());
|
|
if ( fchmod(fd, new_mode) != 0 )
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
void fprint_shell_variable_assignment(FILE* fp, const char* variable, const char* value)
|
|
{
|
|
if ( value )
|
|
{
|
|
fprintf(fp, "export %s='", variable);
|
|
for ( size_t i = 0; value[i]; i++ )
|
|
if ( value[i] == '\'' )
|
|
fprintf(fp, "'\\''");
|
|
else
|
|
fputc(value[i], fp);
|
|
fprintf(fp, "'\n");
|
|
}
|
|
else
|
|
{
|
|
fprintf(fp, "unset %s\n", variable);
|
|
}
|
|
}
|
|
|
|
bool is_success_exit_status(int status)
|
|
{
|
|
return WIFEXITED(status) && WEXITSTATUS(status) == 0;
|
|
}
|
|
|
|
__attribute__((noreturn))
|
|
bool exit_like_exit_status(int status)
|
|
{
|
|
if ( WIFEXITED(status) )
|
|
exit(WEXITSTATUS(status));
|
|
if ( WIFSIGNALED(status) )
|
|
exit(128 + WTERMSIG(status));
|
|
exit(1);
|
|
}
|
|
|
|
enum recovery_state
|
|
{
|
|
RECOVERY_STATE_NONE,
|
|
RECOVERY_STATE_PRINT_COMMAND,
|
|
RECOVERY_STATE_RUN_SHELL,
|
|
};
|
|
|
|
enum recovery_state
|
|
recovery_configure_state(bool set,
|
|
enum recovery_state to_what = RECOVERY_STATE_NONE)
|
|
{
|
|
static enum recovery_state recovery_state = RECOVERY_STATE_NONE;
|
|
if ( set )
|
|
recovery_state = to_what;
|
|
return recovery_state;
|
|
}
|
|
|
|
bool recovery_print_attempted_execution()
|
|
{
|
|
pid_t child_pid = fork();
|
|
if ( child_pid < 0 )
|
|
return false;
|
|
|
|
if ( !child_pid )
|
|
{
|
|
// Redirect stdout and stderr to /dev/null to prevent duplicate errors.
|
|
// The recovery_execvp function below will automatically re-open the
|
|
// terminal device when it needs to talk to the terminal.
|
|
int dev_null = open("/dev/null", O_WRONLY);
|
|
if ( 0 <= dev_null )
|
|
{
|
|
dup2(dev_null, 1);
|
|
dup2(dev_null, 2);
|
|
close(dev_null);
|
|
}
|
|
|
|
recovery_configure_state(true, RECOVERY_STATE_PRINT_COMMAND);
|
|
return true;
|
|
}
|
|
|
|
int status;
|
|
waitpid(child_pid, &status, 0);
|
|
|
|
return false;
|
|
}
|
|
|
|
bool recovery_run_shell()
|
|
{
|
|
pid_t child_pid = fork();
|
|
if ( child_pid < 0 )
|
|
return false;
|
|
|
|
if ( !child_pid )
|
|
{
|
|
recovery_configure_state(true, RECOVERY_STATE_RUN_SHELL);
|
|
return true;
|
|
}
|
|
|
|
int status;
|
|
waitpid(child_pid, &status, 0);
|
|
|
|
return false;
|
|
}
|
|
|
|
int recovery_execvp(const char* path, char* const* argv)
|
|
{
|
|
if ( recovery_configure_state(false) == RECOVERY_STATE_NONE )
|
|
return execvp(path, argv);
|
|
|
|
// Make sure that stdout and stderr go to an interactive terminal.
|
|
if ( !isatty(1) )
|
|
{
|
|
int dev_tty = open("/dev/tty", O_WRONLY);
|
|
if ( 0 <= dev_tty )
|
|
{
|
|
dup2(dev_tty, 1);
|
|
dup2(dev_tty, 2);
|
|
close(dev_tty);
|
|
}
|
|
}
|
|
|
|
printf("Attempted command was: ");
|
|
|
|
for ( int i = 0; argv[i]; i++ )
|
|
{
|
|
if ( i )
|
|
putchar(' ');
|
|
putchar('\'');
|
|
for ( size_t n = 0; argv[i][n]; n++ )
|
|
if ( argv[i][n] == '\'' )
|
|
printf("'\\''");
|
|
else
|
|
putchar(argv[i][n]);
|
|
putchar('\'');
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
if ( recovery_configure_state(false) == RECOVERY_STATE_PRINT_COMMAND )
|
|
_exit(0);
|
|
|
|
const char* cmd_argv[] =
|
|
{
|
|
getenv_def("SHELL", "sh"),
|
|
NULL
|
|
};
|
|
execvp(cmd_argv[0], (char* const*) cmd_argv);
|
|
error(127, errno, "%s", cmd_argv[0]);
|
|
|
|
__builtin_unreachable();
|
|
}
|
|
|
|
bool fork_and_wait_or_recovery()
|
|
{
|
|
int default_selection = 1;
|
|
|
|
while ( true )
|
|
{
|
|
pid_t child_pid = fork_or_death();
|
|
if ( !child_pid )
|
|
return true;
|
|
|
|
int status;
|
|
waitpid(child_pid, &status, 0);
|
|
|
|
if ( is_success_exit_status(status) )
|
|
return false;
|
|
|
|
if ( WIFEXITED(status) )
|
|
error(0, 0, "child with pid %ju exited with status %i.",
|
|
(uintmax_t) child_pid, WEXITSTATUS(status));
|
|
else if ( WIFSIGNALED(status) )
|
|
error(0, 0, "child with pid %ju was killed by signal %i (%s).",
|
|
(uintmax_t) child_pid, WTERMSIG(status),
|
|
strsignal(WTERMSIG(status)));
|
|
else
|
|
error(0, 0, "child with pid %ju exited in an unusual manner (%i).",
|
|
(uintmax_t) child_pid, status);
|
|
|
|
if ( recovery_print_attempted_execution() )
|
|
return true;
|
|
|
|
if ( !isatty(0) )
|
|
exit_like_exit_status(status);
|
|
|
|
FILE* output = fopen("/dev/tty", "we");
|
|
if ( !output )
|
|
exit_like_exit_status(status);
|
|
|
|
retry_ask_recovery_method:
|
|
|
|
fprintf(output, "\n");
|
|
fprintf(output, "1. Abort\n");
|
|
fprintf(output, "2. Try again\n");
|
|
fprintf(output, "3. Pretend command was successful\n");
|
|
fprintf(output, "4. Run $SHELL -i to investigate\n");
|
|
fprintf(output, "5. Dump environment\n");
|
|
fprintf(output, "\n");
|
|
fprintf(output, "Please choose one: [%i] ", default_selection);
|
|
fflush(output);
|
|
|
|
char* input = read_single_line(stdin);
|
|
if ( !input )
|
|
{
|
|
fprintf(output, "\n");
|
|
fclose(output);
|
|
error(0, errno, "can't read line from standard input, aborting.");
|
|
exit_like_exit_status(status);
|
|
}
|
|
|
|
int selection = default_selection;
|
|
if ( input[0] )
|
|
{
|
|
char* input_end;
|
|
selection = (int) strtol(input, &input_end, 0);
|
|
if ( *input_end )
|
|
{
|
|
error(0, 0, "error: `%s' is not an allowed choice", input);
|
|
goto retry_ask_recovery_method;
|
|
}
|
|
|
|
if ( 5 < selection )
|
|
{
|
|
error(0, 0, "error: `%i' is not an allowed choice", selection);
|
|
goto retry_ask_recovery_method;
|
|
}
|
|
}
|
|
|
|
if ( selection == 1 )
|
|
exit_like_exit_status(status);
|
|
|
|
if ( selection == 2 )
|
|
{
|
|
fprintf(output, "\nTrying to execute command again.\n\n");
|
|
fclose(output);
|
|
continue;
|
|
}
|
|
|
|
if ( selection == 3 )
|
|
{
|
|
fprintf(output, "\nPretending the command executed successfully.\n\n");
|
|
fclose(output);
|
|
return false;
|
|
}
|
|
|
|
if ( selection == 4 )
|
|
{
|
|
fprintf(output, "\nDropping you to a recovery shell, type `exit' "
|
|
"when you are done.\n\n");
|
|
if ( recovery_run_shell() )
|
|
return true;
|
|
}
|
|
|
|
if ( selection == 5 )
|
|
{
|
|
for ( size_t i = 0; environ[i]; i++ )
|
|
fprintf(output, "%s\n", environ[i]);
|
|
goto retry_ask_recovery_method;
|
|
}
|
|
|
|
default_selection = 2;
|
|
|
|
goto retry_ask_recovery_method;
|
|
}
|
|
}
|
|
|
|
#endif
|