093fb605f9
The separation was unnecessary, and caused build problems. Let's go wild and obliterate the library. The files are moved to libshadow. Scripted change: $ find libmisc/ -type f \ | grep '\.[chy]$' \ | xargs mv -t lib; Plus updating the Makefile and other references. While at it, I've sorted the sources lists. Link: <https://github.com/shadow-maint/shadow/pull/792> Reported-by: David Seifert <soap@gentoo.org> Cc: Sam James <sam@gentoo.org> Cc: Christian Bricart <christian@bricart.de> Cc: Michael Vetter <jubalh@iodoru.org> Cc: Robert Förster <Dessa@gmake.de> [ soap tested the Gentoo package ] Tested-by: David Seifert <soap@gentoo.org> Acked-by: David Seifert <soap@gentoo.org> Acked-by: Serge Hallyn <serge@hallyn.com> Acked-by: Iker Pedrosa <ipedrosa@redhat.com> Acked-by: <lslebodn@fedoraproject.org> Signed-off-by: Alejandro Colomar <alx@kernel.org>
111 lines
2.0 KiB
C
111 lines
2.0 KiB
C
#include <linux/btrfs_tree.h>
|
|
#include <linux/magic.h>
|
|
#include <sys/statfs.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "prototypes.h"
|
|
|
|
static bool path_exists(const char *p)
|
|
{
|
|
struct stat sb;
|
|
|
|
return stat(p, &sb) == 0;
|
|
}
|
|
|
|
static const char *btrfs_cmd(void)
|
|
{
|
|
const char *const btrfs_paths[] = {"/sbin/btrfs",
|
|
"/bin/btrfs", "/usr/sbin/btrfs", "/usr/bin/btrfs", NULL};
|
|
const char *p;
|
|
int i;
|
|
|
|
for (i = 0, p = btrfs_paths[i]; p; i++, p = btrfs_paths[i])
|
|
if (path_exists(p))
|
|
return p;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int run_btrfs_subvolume_cmd(const char *subcmd, const char *arg1, const char *arg2)
|
|
{
|
|
int status = 0;
|
|
const char *cmd = btrfs_cmd();
|
|
const char *argv[] = {
|
|
"btrfs",
|
|
"subvolume",
|
|
subcmd,
|
|
arg1,
|
|
arg2,
|
|
NULL
|
|
};
|
|
|
|
if (!cmd || access(cmd, X_OK)) {
|
|
return 1;
|
|
}
|
|
|
|
if (run_command(cmd, argv, NULL, &status))
|
|
return -1;
|
|
return status;
|
|
}
|
|
|
|
|
|
int btrfs_create_subvolume(const char *path)
|
|
{
|
|
return run_btrfs_subvolume_cmd("create", path, NULL);
|
|
}
|
|
|
|
|
|
int btrfs_remove_subvolume(const char *path)
|
|
{
|
|
return run_btrfs_subvolume_cmd("delete", "-C", path);
|
|
}
|
|
|
|
|
|
/* Adapted from btrfsprogs */
|
|
/*
|
|
* This intentionally duplicates btrfs_util_is_subvolume_fd() instead of opening
|
|
* a file descriptor and calling it, because fstat() and fstatfs() don't accept
|
|
* file descriptors opened with O_PATH on old kernels (before v3.6 and before
|
|
* v3.12, respectively), but stat() and statfs() can be called on a path that
|
|
* the user doesn't have read or write permissions to.
|
|
*
|
|
* returns:
|
|
* 1 - btrfs subvolume
|
|
* 0 - not btrfs subvolume
|
|
* -1 - error
|
|
*/
|
|
int btrfs_is_subvolume(const char *path)
|
|
{
|
|
struct stat st;
|
|
int ret;
|
|
|
|
ret = is_btrfs(path);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
ret = stat(path, &st);
|
|
if (ret == -1)
|
|
return -1;
|
|
|
|
if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode)) {
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Adapted from btrfsprogs */
|
|
int is_btrfs(const char *path)
|
|
{
|
|
struct statfs sfs;
|
|
int ret;
|
|
|
|
ret = statfs(path, &sfs);
|
|
if (ret == -1)
|
|
return -1;
|
|
|
|
return sfs.f_type == BTRFS_SUPER_MAGIC;
|
|
}
|
|
|