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sortix--sortix/sysinstall/release.c
2016-02-21 18:41:11 +01:00

206 lines
5 KiB
C

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2015, 2016.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
release.c
Utility functions to handle release information.
*******************************************************************************/
#include <err.h>
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "release.h"
void release_free(struct release* release)
{
free(release->pretty_name);
}
static char* os_release_eval(const char* string)
{
char* result;
size_t result_size;
FILE* fp = open_memstream(&result, &result_size);
if ( !fp )
return NULL;
bool escaped = false;
bool singly_quote = false;
bool doubly_quote = false;
while ( *string )
{
char c = *string++;
if ( !escaped && !singly_quote && c == '\\' )
escaped = true;
else if ( !escaped && !doubly_quote && c == '\'' )
singly_quote = !singly_quote;
else if ( !escaped && !singly_quote && c == '"' )
doubly_quote = !doubly_quote;
else
{
fputc((unsigned char) c, fp);
escaped = false;
}
}
if ( fclose(fp) == EOF )
{
free(result);
return NULL;
}
return result;
}
static void parse_version(const char* string,
unsigned long* major_ptr,
unsigned long* minor_ptr)
{
*major_ptr = strtoul(string, (char**) &string, 10);
if ( *string == '.' )
string++;
*minor_ptr = strtoul(string, (char**) &string, 10);
}
static void parse_release(const char* string,
unsigned long* major_ptr,
unsigned long* minor_ptr,
bool* dev_ptr)
{
*major_ptr = strtoul(string, (char**) &string, 10);
if ( *string == '.' )
string++;
*minor_ptr = strtoul(string, (char**) &string, 10);
*dev_ptr = *string != '\0';
}
bool os_release_load(struct release* release,
const char* path,
const char* errpath)
{
memset(release, 0, sizeof(*release));
FILE* fp = fopen(path, "r");
if ( !fp )
{
if ( errno != ENOENT )
warn("%s", errpath);
return false;
}
bool failure = false;
bool success = false;
bool found_id = false;
bool found_pretty_name = false;
bool found_sortix_abi = false;
bool found_version_id = false;
char* line = NULL;
size_t line_size = 0;
ssize_t line_length;
while ( 0 < (errno = 0, line_length = getline(&line, &line_size, fp)) )
{
if ( line[line_length-1] == '\n' )
line[--line_length] = '\0';
if ( !strncmp(line, "ID=", strlen("ID=")) )
{
const char* param = line + strlen("ID=");
found_id = true;
char* value = os_release_eval(param);
if ( value )
{
if ( strcmp(value, "sortix") != 0 )
{
warn("%s: ID does not specify a 'sortix' system", errpath);
failure = true;
}
free(value);
}
else
{
warn("malloc");
failure = true;
}
}
else if ( !strncmp(line, "PRETTY_NAME=", strlen("PRETTY_NAME=")) )
{
const char* param = line + strlen("PRETTY_NAME=");
found_pretty_name = true;
if ( !(release->pretty_name = os_release_eval(param)) )
{
warn("malloc");
failure = true;
}
}
else if ( !strncmp(line, "SORTIX_ABI=", strlen("SORTIX_ABI=")) )
{
const char* param = line + strlen("SORTIX_ABI=");
found_sortix_abi = true;
char* value = os_release_eval(param);
if ( value )
{
parse_version(value, &release->abi_major, &release->abi_minor);
free(value);
}
else
{
warn("malloc");
failure = true;
}
}
else if ( !strncmp(line, "VERSION_ID=", strlen("VERSION_ID=")) )
{
const char* param = line + strlen("VERSION_ID=");
found_version_id = true;
char* value = os_release_eval(param);
if ( value )
{
parse_release(value, &release->version_major,
&release->version_minor, &release->version_dev);
free(value);
}
else
{
warn("malloc");
failure = true;
}
}
}
if ( errno )
warn("%s", errpath);
else if ( failure )
;
else if ( !found_id )
warnx("%s: No ID", errpath);
else if ( !found_pretty_name )
warnx("%s: No PRETTY_NAME", errpath);
else if ( !found_sortix_abi )
warnx("%s: No SORTIX_ABI", errpath);
else if ( !found_version_id )
warnx("%s: No VERSION_ID", errpath);
else
success = true;
free(line);
fclose(fp);
if ( failure || !success )
{
release_free(release);
return false;
}
return true;
}