mke2fs: add an option in mke2fs.conf to proceed after a delay

If mke2fs needs to ask the user for permission, and the user doesn't
type anything the specified delay in the /etc/mke2fs.conf file,
proceed as if the user had said yes.  The default is to do what we
currently do, which is to wait until the user answers the question one
way or the other.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

5 files changed, 52 insertions, 10 deletions

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index a2b1f657..6b099e10 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -102,6 +102,7 @@ static __u32	fs_stride;
 static int	quotatype = -1;  /* Initialize both user and group quotas by default */
 static __u64	offset;
 static blk64_t journal_location = ~0LL;
+static int	proceed_delay = -1;
 
 static struct ext2_super_block fs_param;
 static char *fs_uuid = NULL;
@@ -1749,9 +1750,12 @@ profile_error:
 	if (optind < argc)
 		usage();
 
+	profile_get_integer(profile, "options", "proceed_delay", 0, 0,
+			    &proceed_delay);
+
 	if (!check_plausibility(device_name, CREATE_FILE,
 				&is_device) && !force)
-		proceed_question();
+		proceed_question(proceed_delay);
 
 	check_mount(device_name, force, _("filesystem"));
 
@@ -1797,7 +1801,7 @@ profile_error:
 	} else if (!force && is_device && (fs_blocks_count > dev_size)) {
 		com_err(program_name, 0, "%s",
 			_("Filesystem larger than apparent device size."));
-		proceed_question();
+		proceed_question(proceed_delay);
 	}
 
 	if (!fs_type)
@@ -2071,7 +2075,7 @@ profile_error:
 			com_err(program_name, 0,
 				_("%d-byte blocks too big for system (max %d)"),
 				blocksize, sys_page_size);
-			proceed_question();
+			proceed_question(proceed_delay);
 		}
 		fprintf(stderr, _("Warning: %d-byte blocks too big for system "
 				  "(max %d), forced to continue\n"),
@@ -2785,7 +2789,7 @@ int main (int argc, char *argv[])
 
 		if (!check_plausibility(journal_device, CHECK_BLOCK_DEV,
 					NULL) && !force)
-			proceed_question();
+			proceed_question(proceed_delay);
 		check_mount(journal_device, force, _("journal"));
 
 		retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
diff --git a/misc/mke2fs.conf.5.in b/misc/mke2fs.conf.5.in
index 02efdce4..8e25892e 100644
--- a/misc/mke2fs.conf.5.in
+++ b/misc/mke2fs.conf.5.in
@@ -68,7 +68,10 @@ The following stanzas are used in the
 .I mke2fs.conf
 file.  They will be described in more detail in future sections of this
 document.
-.TP 
+.TP
+.I [options]
+Contains relations which influence how mke2fs behaves.
+.TP
 .I [defaults]
 Contains relations which define the default parameters
 used by
@@ -84,6 +87,18 @@ the
 .B -T
 option to
 .BR mke2fs (8).
+.SH THE [options] STANZA
+The following relations are defined in the
+.I [options]
+stanza.
+.TP
+.I proceed_delay
+If this relation is set to a positive integer, then if mke2fs will
+proceed after waiting
+.I proceed_delay
+seconds, after asking the user for permission to proceed, even if the
+user has not answered the question.  Defaults to 0, which means to wait
+until the user answers the question one way or another.
 .SH THE [defaults] STANZA
 The following relations are defined in the 
 .I [defaults]
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index fbf5f524..7b3723b1 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -675,7 +675,7 @@ static int add_journal(ext2_filsys fs)
 	if (journal_device) {
 		if (!check_plausibility(journal_device, CHECK_BLOCK_DEV,
 					NULL))
-			proceed_question();
+			proceed_question(-1);
 		check_mount(journal_device, 0, _("journal"));
 #ifdef CONFIG_TESTIO_DEBUG
 		if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
diff --git a/misc/util.c b/misc/util.c
index f85942e3..afb0058c 100644
--- a/misc/util.c
+++ b/misc/util.c
@@ -14,6 +14,8 @@
 
 #include "config.h"
 #include <fcntl.h>
+#include <setjmp.h>
+#include <signal.h>
 #include <stdio.h>
 #include <string.h>
 #ifdef HAVE_ERRNO_H
@@ -68,18 +70,39 @@ char *get_progname(char *argv_zero)
 		return cp+1;
 }
 
-void proceed_question(void)
+static jmp_buf alarm_env;
+
+static void alarm_signal(int signal)
+{
+	longjmp(alarm_env, 1);
+}
+
+void proceed_question(int delay)
 {
 	char buf[256];
 	const char *short_yes = _("yY");
 
 	fflush(stdout);
 	fflush(stderr);
-	fputs(_("Proceed anyway? (y,n) "), stdout);
+	if (delay > 0) {
+		if (setjmp(alarm_env)) {
+			signal(SIGALRM, SIG_IGN);
+			printf(_("<proceeding>\n"));
+			return;
+		}
+		signal(SIGALRM, alarm_signal);
+		printf(_("Proceed anyway (or wait %d seconds) ? (y,n) "),
+		       delay);
+		alarm(delay);
+	} else
+		fputs(_("Proceed anyway? (y,n) "), stdout);
 	buf[0] = 0;
 	if (!fgets(buf, sizeof(buf), stdin) ||
-	    strchr(short_yes, buf[0]) == 0)
+	    strchr(short_yes, buf[0]) == 0) {
+		putc('\n', stdout);
 		exit(1);
+	}
+	signal(SIGALRM, SIG_IGN);
 }
 
 /*
diff --git a/misc/util.h b/misc/util.h
index b80d4895..9de3fbf6 100644
--- a/misc/util.h
+++ b/misc/util.h
@@ -25,7 +25,7 @@ extern char	*journal_location_string;
 extern int strcasecmp (char *s1, char *s2);
 #endif
 extern char *get_progname(char *argv_zero);
-extern void proceed_question(void);
+extern void proceed_question(int delay);
 extern int check_plausibility(const char *device, int flags,
 			      int *ret_is_dev);
 extern void parse_journal_opts(const char *opts);