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docs/manual: makedevs only accepts numerical values

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Because of a limitation in how makedevs resolves names [0], usernames
and groupnames would be resolved with UIDs and GIDs from the host, not
the target.

Fixing makedevs would involve us rewriting a /etc/passwd and /etc/group
parser (not too complex, still not trivial).

Document that the user and group fields should only be numbers, not
names. Also, the manual is currently misleading, as an example indeed
uses names for the user and group fields. Fix that and expand the
explanations.

The mode field should also be numbers, not a rwx combo.

Slight typographical eye-candy about major/minor fields.

[0] it uses getpwnma(3) and getgrnam(3) to resolve names to IDs, and
those only resolve names on the host (i.e. there is no way to specify
a chroot-like feature)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2015-08-29 00:25:01 +02:00 committed by Thomas Petazzoni
parent 9428c06a1f
commit dc1ba281a5
1 changed files with 7 additions and 4 deletions
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11
docs/manual/makedev-syntax.txt
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@ -28,8 +28,9 @@ There are a few non-trivial blocks:
* c: a character device file
* b: a block device file
* p: a named pipe
- +mode+, +uid+ and +gid+ are the usual permissions settings
- +major+ and +minor+ are here for device files - set to - for other
- +mode+, +uid+ and +gid+ are the usual permissions settings (only
numerical values are allowed)
- +major+ and +minor+ are here for device files, set to +-+ for other
files
- +start+, +inc+ and +count+ are for when you want to create a batch
of files, and can be reduced to a loop, beginning at +start+,
@ -43,10 +44,12 @@ this syntax, you will need to put:
----
Alternatively, if you want to change owner/permission of a directory
recursively, you can put:
recursively, you can put (to set UID to 123, GID to 456 and access
rights to rwxr-x--- for the directory /usr/share/myapp and all files
and directories below it):
----
/usr/share/myapp r 750 myuser myuser - - - - -
/usr/share/myapp r 750 123 456 - - - - -
----
On the other hand, if you want to create the device file +/dev/hda+