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D49850.id154088.diff
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D49850.id154088.diff

diff --git a/usr.bin/runat/Makefile.xattr b/usr.bin/runat/Makefile
--- a/usr.bin/runat/Makefile.xattr
+++ b/usr.bin/runat/Makefile
@@ -0,0 +1,3 @@
+PROG= runat
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/runat/runat.1.xattr b/usr.bin/runat/runat.1
--- a/usr.bin/runat/runat.1.xattr
+++ b/usr.bin/runat/runat.1
@@ -0,0 +1,56 @@
+.\" Copyright (c) 2025 Rick Macklem.
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.Dd April 15, 2025
+.Dt RUNAT 1
+.Os
+.Sh NAME
+.Nm runat
+.Nd run a shell command on a named attribute directory
+.Sh SYNOPSIS
+.Nm
+.Op Fl create
+.Op Fl -
+.Op Ar file
+.Op Ar shell command
+.Sh DESCRIPTION
+The
+.Nm
+utility runs the shell command on the named attribute directory for the
+.Ar file
+argument.
+It does a
+.Xr fchdir 2
+system call to change the current working directory into the
+named attribute directory for the
+.Ar file
+argument and then performs the shell command via
+.Xr sh 1 .
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl create
+Create the named attribute directory if it does not already exist.
+.It Fl -
+Used if the
+.Ar file
+argument happens to be called
+.Dq -create .
+.El
+.Sh EXAMPLES
+For a file called
+.Dq myfile :
+.Bd -literal
+$ runat myfile ls -l # lists the attributes for myfile
+$ runat myfile cp /etc/hosts attrhosts # creates attrhosts
+$ runat myfile cat attrhosts # displays contents of attrhosts
+.Ed
+.Sh SEE ALSO
+.Xr sh 1 ,
+.Xr open 2 ,
+.Xr named_attribute 7
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.Fx 15.0 .
diff --git a/usr.bin/runat/runat.c.xattr b/usr.bin/runat/runat.c
--- a/usr.bin/runat/runat.c.xattr
+++ b/usr.bin/runat/runat.c
@@ -0,0 +1,84 @@
+/*-
+ * Copyright (c) 2025 Rick Macklem
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <sys/param.h>
+#include <sys/wait.h>
+#include <err.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void
+usage(void)
+{
+ (void)fprintf(stderr, "usage: runat [-create/--] <file> "
+ "<shell command>\n");
+ exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+ int fmode, i, file_fd, nameddir_fd, outsiz;
+ char *buf;
+ long named_enabled;
+ size_t pos, siz;
+
+ fmode = O_NAMEDATTR | O_RDONLY | O_CLOEXEC;
+ if (argc <= 2)
+ usage();
+ argv++;
+ argc--;
+ if (strcmp(argv[0], "-create") == 0) {
+ fmode |= O_CREAT;
+ argv++;
+ argc--;
+ } else if (strcmp(argv[0], "--") == 0) {
+ argv++;
+ argc--;
+ }
+ if (argc < 2)
+ usage();
+
+ named_enabled = pathconf(argv[0], _PC_NAMEDATTR_ENABLED);
+ if (named_enabled <= 0)
+ errx(1, "Named attributes not enabled for %s", argv[0]);
+
+ /* Generate the command string for "sh". */
+ siz = 0;
+ for (i = 1; i < argc; i++)
+ siz += strlen(argv[i]) + 1;
+ buf = malloc(siz);
+ if (buf == NULL)
+ errx(1, "Cannot malloc");
+ pos = 0;
+ for (i = 1; i < argc; i++) {
+ outsiz = snprintf(&buf[pos], siz, "%s ", argv[i]);
+ if ((size_t)outsiz > siz)
+ errx(1, "Arguments too large");
+ pos += outsiz;
+ siz -= outsiz;
+ }
+ buf[pos - 1] = '\0';
+
+ file_fd = open(argv[0], O_RDONLY | O_CLOEXEC, 0);
+ if (file_fd < 0)
+ err(1, "Cannot open %s", argv[0]);
+ nameddir_fd = openat(file_fd, ".", fmode, 0);
+ if (nameddir_fd < 0)
+ err(1, "Cannot open named attribute directory "
+ "for %s", argv[0]);
+
+ if (fchdir(nameddir_fd) < 0)
+ err(1, "Cannot fchdir to named attribute dir");
+
+ execl(_PATH_BSHELL, "sh", "-c", buf, NULL);
+ err(1, "Could not exec /bin/sh");
+}

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