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authorRob Landley <rob@landley.net>2019-02-23 21:03:27 -0600
committerRob Landley <rob@landley.net>2019-02-23 21:03:27 -0600
commit6874839b97e585aeadbc146c353442e7ec7f78aa (patch)
treec4d0c28dc26731840bb4023cede839707450491e /toys
parent1558e7dbbf3a37766f09616c53168c090a7d617e (diff)
downloadtoybox-6874839b97e585aeadbc146c353442e7ec7f78aa.tar.gz
Add blkid -U and -L.
Diffstat (limited to 'toys')
-rw-r--r--toys/other/blkid.c55
1 files changed, 36 insertions, 19 deletions
diff --git a/toys/other/blkid.c b/toys/other/blkid.c
index ee3564cf..98055b41 100644
--- a/toys/other/blkid.c
+++ b/toys/other/blkid.c
@@ -4,17 +4,20 @@
*
* See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
-USE_BLKID(NEWTOY(blkid, 0, TOYFLAG_BIN))
+USE_BLKID(NEWTOY(blkid, "UL[!LU]", TOYFLAG_BIN))
USE_FSTYPE(NEWTOY(fstype, "<1", TOYFLAG_BIN))
config BLKID
bool "blkid"
default y
help
- usage: blkid DEV...
+ usage: blkid [-UL] DEV...
Prints type, label and UUID of filesystem on a block device or image.
+ -U Show UUID only (or device with that UUID)
+ -L Show LABEL only (or device with that LABEL)
+
config FSTYPE
bool "fstype"
default y
@@ -31,9 +34,7 @@ struct fstype {
char *name;
uint64_t magic;
int magic_len, magic_offset, uuid_off, label_len, label_off;
-};
-
-static const struct fstype fstypes[] = {
+} static const fstypes[] = {
{"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // keep this first for ext3/4 check
{"swap", 0x4341505350415753LL, 8, 4086, 1036, 15, 1052},
// NTFS label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
@@ -57,10 +58,17 @@ static const struct fstype fstypes[] = {
{"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
};
+static void flagshow(char *s, char *name)
+{
+ if (*toys.optargs && strcmp(s, *toys.optargs)) return;
+ printf("%s\n", *toys.optargs ? name : s);
+ if (*toys.optargs) xexit();
+}
+
static void do_blkid(int fd, char *name)
{
int off, i, j, len;
- char *type;
+ char buf[128], *type, *s;
off = i = 0;
@@ -113,37 +121,44 @@ static void do_blkid(int fd, char *name)
}
// output for blkid
- printf("%s:",name);
-
- if (fstypes[i].label_len) {
- char *s = toybuf+fstypes[i].label_off-off;
+ if (!toys.optflags) printf("%s:",name);
- len = fstypes[i].label_len;
+ len = fstypes[i].label_len;
+ if (!FLAG(U) && len) {
+ s = toybuf+fstypes[i].label_off-off;
if (!strcmp(type, "vfat")) {
while (len && s[len-1]==' ') len--;
if (strstart(&s, "NO NAME")) len=0;
}
- if (len && *s) printf(" LABEL=\"%.*s\"", len, s);
+ if (len && *s) {
+ sprintf(buf, "%.*s", len, s);
+ if (FLAG(L)) return flagshow(buf, name);
+ printf(" LABEL=\"%s\"", buf);
+ }
}
- if (fstypes[i].uuid_off) {
- int bits = 0x550, size = fstypes[i].uuid_off >> 24,
- uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
+ len = fstypes[i].uuid_off;
+ if (!FLAG(L) && len) {
+ int bits = 0x550, size = len >> 24, uoff = (len&((1<<24)-1))-off;
+ // Assemble UUID with whatever size and set of dashes this filesystem uses
if (size) bits = 4*(size == 4);
else size = 16;
+ for (j = 0, s = buf; j < size; j++)
+ s += sprintf(s, "-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
- printf(" UUID=\"");
- for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
- printf("\"");
+ if (FLAG(U)) return flagshow(buf, name);
+ printf(" UUID=\"%s\"", buf);
}
+ if (toys.optflags) return;
+
printf(" TYPE=\"%s\"\n", type);
}
void blkid_main(void)
{
- if (*toys.optargs) loopfiles(toys.optargs, do_blkid);
+ if (*toys.optargs && !FLAG(L) && !FLAG(U)) loopfiles(toys.optargs, do_blkid);
else {
unsigned int ma, mi, sz, fd;
char *name = toybuf, *buffer = toybuf+1024, device[32];
@@ -164,6 +179,8 @@ void blkid_main(void)
}
if (CFG_TOYBOX_FREE) fclose(fp);
}
+
+ if (FLAG(L) || FLAG(U)) toys.exitval = 2;
}
void fstype_main(void)