123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/*
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* Copyright (C) 2011,2013 Colin Walters <walters@verbum.org>
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*
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* SPDX-License-Identifier: LGPL-2.0+
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef __OSTREE_MOUNT_UTIL_H_
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#define __OSTREE_MOUNT_UTIL_H_
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#include <err.h>
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#include <stdlib.h>
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#include <sys/statvfs.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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static inline int
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path_is_on_readonly_fs (char *path)
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{
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struct statvfs stvfsbuf;
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if (statvfs (path, &stvfsbuf) == -1)
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err (EXIT_FAILURE, "statvfs(%s)", path);
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return (stvfsbuf.f_flag & ST_RDONLY) != 0;
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}
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static inline char *
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read_proc_cmdline (void)
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{
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FILE *f = fopen("/proc/cmdline", "r");
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char *cmdline = NULL;
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size_t len;
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if (!f)
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goto out;
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/* Note that /proc/cmdline will not end in a newline, so getline
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* will fail unelss we provide a length.
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*/
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if (getline (&cmdline, &len, f) < 0)
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goto out;
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/* ... but the length will be the size of the malloc buffer, not
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* strlen(). Fix that.
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*/
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len = strlen (cmdline);
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if (cmdline[len-1] == '\n')
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cmdline[len-1] = '\0';
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out:
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if (f)
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fclose (f);
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return cmdline;
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}
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static inline char *
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read_proc_cmdline_ostree (void)
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{
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char *cmdline = NULL;
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const char *iter;
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char *ret = NULL;
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cmdline = read_proc_cmdline ();
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if (!cmdline)
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err (EXIT_FAILURE, "failed to read /proc/cmdline");
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iter = cmdline;
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while (iter != NULL)
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{
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const char *next = strchr (iter, ' ');
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const char *next_nonspc = next;
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while (next_nonspc && *next_nonspc == ' ')
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next_nonspc += 1;
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if (strncmp (iter, "ostree=", strlen ("ostree=")) == 0)
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{
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const char *start = iter + strlen ("ostree=");
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if (next)
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ret = strndup (start, next - start);
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else
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ret = strdup (start);
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break;
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}
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iter = next_nonspc;
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}
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free (cmdline);
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return ret;
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}
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/* This is an API for other projects to determine whether or not the
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* currently running system is ostree-controlled.
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*/
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static inline void
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touch_run_ostree (void)
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{
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int fd = open ("/run/ostree-booted", O_CREAT | O_WRONLY | O_NOCTTY | O_CLOEXEC, 0640);
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/* We ignore failures here in case /run isn't mounted...not much we
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* can do about that, but we don't want to fail.
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*/
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if (fd == -1)
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return;
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(void) close (fd);
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}
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#endif /* __OSTREE_MOUNT_UTIL_H_ */
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