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machined/machinectl: add logic to show list of available images

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This adds a new bus call to machined that enumerates /var/lib/container
and returns all trees stored in it, distuingishing three types:

        - GPT disk images, which are files suffixed with ".gpt"
        - directory trees
        - btrfs subvolumes
This commit is contained in:
Lennart Poettering
2014-12-19 18:42:50 +01:00
parent 8eebf6ad55
commit cd61c3bfd7
11 changed files with 503 additions and 11 deletions
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23
src/shared/btrfs-util.c
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@ -84,18 +84,18 @@ int btrfs_is_snapshot(int fd) {
struct stat st;
struct statfs sfs;
if (fstatfs(fd, &sfs) < 0)
return -errno;
if (!F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
return 0;
/* On btrfs subvolumes always have the inode 256 */
if (fstat(fd, &st) < 0)
return -errno;
/* On btrfs subvolumes always have the inode 256 */
if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
return 0;
return S_ISDIR(st.st_mode) && st.st_ino == 256;
if (fstatfs(fd, &sfs) < 0)
return -errno;
return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
}
int btrfs_subvol_snapshot(const char *old_path, const char *new_path, bool read_only, bool fallback_copy) {
@ -232,6 +232,15 @@ int btrfs_subvol_read_only(const char *path, bool b) {
return 0;
}
int btrfs_subvol_is_read_only_fd(int fd) {
uint64_t flags;
if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)
return -errno;
return !!(flags & BTRFS_SUBVOL_RDONLY);
}
int btrfs_reflink(int infd, int outfd) {
int r;