config/git: import suckless sbase

i currently use the output of sha512sum in several
places of xbmk, which is a bit unreliable in case
output changes.

other cases where i use util outputs in variables
are probably reliable, because i'm using mostly
posix utilities in those.

to mitigate this, i now import suckless sbase, which
has a reasonable sha512sum implementation.

*every* binary it builds is being placed in build.list,
because i'll probably start using more of them.

for example, i may start modifying the "date"
implementation, adding the GNU-specific options that
i need as mentioned on init.sh

i'm importing it in util/ because the sha512sum
util is needed for verifying project sources, so
if sbase itself is a "project source", that means
we can into a chicken and egg bootstrapping problem.

this is sbase at revision:
055cc1ae1b3a13c3d8f25af0a4a3316590efcd48

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 104 insertions, 0 deletions

diff --git a/util/sbase/chown.c b/util/sbase/chown.c
new file mode 100644
index 00000000..71628eb6
--- /dev/null
+++ b/util/sbase/chown.c
@@ -0,0 +1,104 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "fs.h"
+#include "util.h"
+
+static int   hflag = 0;
+static uid_t uid = -1;
+static gid_t gid = -1;
+static int   ret = 0;
+
+static void
+chownpwgr(int dirfd, const char *name, struct stat *st, void *data, struct recursor *r)
+{
+	int flags = 0;
+
+	if ((r->maxdepth == 0 && r->follow == 'P') || (r->follow == 'H' && r->depth) || (hflag && !(r->depth)))
+		flags |= AT_SYMLINK_NOFOLLOW;
+
+	if (fchownat(dirfd, name, uid, gid, flags) < 0) {
+		weprintf("chown %s:", r->path);
+		ret = 1;
+	} else if (S_ISDIR(st->st_mode)) {
+		recurse(dirfd, name, NULL, r);
+	}
+}
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-h] [-R [-H | -L | -P]] owner[:[group]] file ...\n"
+	        "       %s [-h] [-R [-H | -L | -P]] :group file ...\n",
+	        argv0, argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct group *gr;
+	struct passwd *pw;
+	struct recursor r = { .fn = chownpwgr, .maxdepth = 1, .follow = 'P' };
+	char *owner, *group;
+
+	ARGBEGIN {
+	case 'h':
+		hflag = 1;
+		break;
+	case 'r':
+	case 'R':
+		r.maxdepth = 0;
+		break;
+	case 'H':
+	case 'L':
+	case 'P':
+		r.follow = ARGC();
+		break;
+	default:
+		usage();
+	} ARGEND
+
+	if (argc < 2)
+		usage();
+
+	owner = argv[0];
+	if ((group = strchr(owner, ':')))
+		*group++ = '\0';
+
+	if (owner && *owner) {
+		errno = 0;
+		pw = getpwnam(owner);
+		if (pw) {
+			uid = pw->pw_uid;
+		} else {
+			if (errno)
+				eprintf("getpwnam %s:", owner);
+			uid = estrtonum(owner, 0, UINT_MAX);
+		}
+	}
+	if (group && *group) {
+		errno = 0;
+		gr = getgrnam(group);
+		if (gr) {
+			gid = gr->gr_gid;
+		} else {
+			if (errno)
+				eprintf("getgrnam %s:", group);
+			gid = estrtonum(group, 0, UINT_MAX);
+		}
+	}
+	if (uid == (uid_t)-1 && gid == (gid_t)-1)
+		usage();
+
+	for (argc--, argv++; *argv; argc--, argv++)
+		recurse(AT_FDCWD, *argv, NULL, &r);
+
+	return ret || recurse_status;
+}