thirdparty/util-linux
2
0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 1

lib/path: new implementation

Browse source 
The goal is to avoid duplicate code in path.c and sysfs.c and make it
possible to define prefix for paths for all sysfs and procfs based
utils. Now we have /proc snapshots (for tests) for lscpu only. It
would be nice to have the same (for sysfs) for lsblk and another tools.

* very simple API to read numbers, strings and symlinks

* based on openat()

     pc = ul_new_path("/sys/block/sda");
     ul_path_read_u64(pc, &size, "size");
     ul_path_read_u64(pc, &lsz, "queue/logical_block_size");

* printf-like API to generate paths, for example:

     ul_path_readf_u64(pc, &num, "sda%d/size", partno)

* allow to define prefix to redirect hardcoded paths to another
  location, for example:

     pc = ul_new_path("/sys/block/sda");
     ul_path_set_prefix(pc, "/my/regression/dump");
     ul_path_read_u64(pc, &num, "size");

  to read /my/regression/dump/sys/block/sda/size

* allow to extend the API by "dialects", for example for sysfs:

     pc = ul_new_path(NULL);
     sysfs_blkdev_init_path(pc, devno, NULL);

  and use ul_path_* functions to read from @pc initialized by
  sysfs_blkdev_init_path()

* add test_path binary

Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2018-05-09 15:54:12 +02:00
parent 1b06b33dd0
commit 1ed21c80ed
3 changed files with 1076 additions and 219 deletions
Download patch file Download diff file Expand all files Collapse all files

1156
lib/path.c
View file

File diff suppressed because it is too large Load diff