Bug 989356 - cap-get-file will return error if the file has not be set capabilities
cap-get-file will return error if the file has not be set capabilities
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libguestfs (Show other bugs)
Unspecified Unspecified
medium Severity medium
: rc
: ---
Assigned To: Richard W.M. Jones
Virtualization Bugs
Depends On: 989352
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Reported: 2013-07-29 02:48 EDT by bfan
Modified: 2014-06-17 22:00 EDT (History)
2 users (show)

See Also:
Fixed In Version: libguestfs-1.22.5-2.el7
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 989352
Last Closed: 2014-06-13 08:42:10 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description bfan 2013-07-29 02:48:54 EDT
+++ This bug was initially created as a clone of Bug #989352 +++

Description of problem:
cap-get-file should not return error when the file has no capabilities, it's not grace. it's better do a further process to return NULL likes linux original command "getcap"

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
# guestfish -N fs -m /dev/sda1 touch /testfile : cap-get-file /testfile
libguestfs: error: cap_get_file: /testfile: No data available

Actual results:
guestfish return error

Expected results:
should return NULL

Additional info:
Same issue in rhel7(libguestfs1.22.4-2)

Fan Bo
Comment 1 Richard W.M. Jones 2013-07-29 09:28:38 EDT
Upstream 'getcap' utility (part of libcap) has the following code:

    cap_d = cap_get_file(fname);
    if (cap_d == NULL) {
        if (errno != ENODATA) {
            fprintf(stderr, "Failed to get capabilities of file `%s' (%s)\n",
                    fname, strerror(errno));
        } else if (verbose) {
            printf("%s\n", fname);
        return 0;

In other words, it's programmed to ignore the ENODATA error.

I will make a corresponding change to libguestfs.
Comment 4 bfan 2013-12-03 01:55:08 EST
Verified with libguestfs-1.22.6-16.el7.x86_64

# guestfish -N fs -m /dev/sda1 touch /testfile : cap-get-file /testfile


It returns Null, that's what we expect.
Comment 5 Ludek Smid 2014-06-13 08:42:10 EDT
This request was resolved in Red Hat Enterprise Linux 7.0.

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