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| author | Sami Kerola | 2012-12-16 11:43:54 +0100 |
|---|---|---|
| committer | Karel Zak | 2012-12-19 11:05:04 +0100 |
| commit | bb2d1ea559f4563e2ad08fb02886625de703877e (patch) | |
| tree | abd5cc6f11b576bf9e52baf9b1794d812c8fcbd1 /disk-utils/isosize.c | |
| parent | isosize: fix usage() -h option print out (diff) | |
| download | kernel-qcow2-util-linux-bb2d1ea559f4563e2ad08fb02886625de703877e.tar.gz kernel-qcow2-util-linux-bb2d1ea559f4563e2ad08fb02886625de703877e.tar.xz kernel-qcow2-util-linux-bb2d1ea559f4563e2ad08fb02886625de703877e.zip | |
isosize: inform if file does not look like iso file system
$ isosize /dev/urandom
isosize: /dev/urandom: might not be iso file system
-67690643227260
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Diffstat (limited to 'disk-utils/isosize.c')
| -rw-r--r-- | disk-utils/isosize.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/disk-utils/isosize.c b/disk-utils/isosize.c index 625dd427e..5f1a2971c 100644 --- a/disk-utils/isosize.c +++ b/disk-utils/isosize.c @@ -32,6 +32,14 @@ #define ISODCL(from, to) (to - from + 1) +static int is_iso(int fd) +{ + char label[8]; + if (pread(fd, &label, 8, 0x8000) == -1) + return 1; + return memcmp(&label, &"\1CD001\1", 8); +} + static int isonum_721(unsigned char *p) { return ((p[0] & 0xff) @@ -124,6 +132,8 @@ static void isosize(char *filenamep, int xflag, long divisor) if ((fd = open(filenamep, O_RDONLY)) < 0) err(EXIT_FAILURE, _("cannot open %s"), filenamep); + if (is_iso(fd)) + warnx(_("%s: might not be iso file system"), filenamep); if (lseek(fd, 16 << 11, 0) == (off_t) - 1) err(EXIT_FAILURE, _("seek error on %s"), filenamep); |