2 files changed, 60 insertions, 19 deletions

diff --git a/usr.bin/fetch/fetch.1 b/usr.bin/fetch/fetch.1
index 3922db581930..0dbbc0b04f15 100644
--- a/usr.bin/fetch/fetch.1
+++ b/usr.bin/fetch/fetch.1
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd March 11, 2003
+.Dd December 14, 2008
 .Dt FETCH 1
 .Os
 .Sh NAME
@@ -37,17 +37,25 @@
 .Nd retrieve a file by Uniform Resource Locator
 .Sh SYNOPSIS
 .Nm
-.Op Fl 146AFMPRUadlmnpqrsv
+.Op Fl 146AadFlMmnPpqRrsUv
 .Op Fl B Ar bytes
+.Op Fl i Ar file
+.Op Fl N Ar file
+.Op Fl o Ar file
 .Op Fl S Ar bytes
 .Op Fl T Ar seconds
+.Op Fl w Ar seconds
+.Ar URL ...
+.Nm
+.Op Fl 146AadFlMmnPpqRrsUv
+.Op Fl B Ar bytes
+.Op Fl i Ar file
 .Op Fl N Ar file
 .Op Fl o Ar file
+.Op Fl S Ar bytes
+.Op Fl T Ar seconds
 .Op Fl w Ar seconds
-.Op Fl h Ar host
-.Op Fl c Ar dir
-.Op Fl f Ar file
-.Op Ar URL ...
+.Fl h Ar host Fl f Ar file Oo Fl c Ar dir Oc
 .Sh DESCRIPTION
 The
 .Nm
@@ -59,7 +67,7 @@ command line.
 .Pp
 The following options are available:
 .Bl -tag -width Fl
-.It Fl \&1
+.It Fl 1
 Stop and return exit code 0 at the first successfully retrieved file.
 .It Fl 4
 Forces
@@ -110,6 +118,12 @@ The file to retrieve is located on the host
 .Ar host .
 This option is deprecated and is provided for backward compatibility
 only.
+.It Fl i Ar file
+If-Modified-Since mode: the remote file will only be retrieved if it
+is newer than
+.Ar file
+on the local host.
+(HTTP only)
 .It Fl l
 If the target is a file-scheme URL, make a symbolic link to the target
 rather than trying to copy it.
@@ -243,6 +257,12 @@ If multiple URLs are listed on the command line,
 .Nm
 will attempt to retrieve each one of them in turn, and will return
 zero only if they were all successfully retrieved.
+.Pp
+If the
+.Fl i
+argument is used and the remote file is not newer than the
+specified file then the command will still return success,
+although no file is transferred.
 .Sh SEE ALSO
 .Xr fetch 3
 .Sh HISTORY
diff --git a/usr.bin/fetch/fetch.c b/usr.bin/fetch/fetch.c
index 3dc276aaf719..1bf7e02ddfeb 100644
--- a/usr.bin/fetch/fetch.c
+++ b/usr.bin/fetch/fetch.c
@@ -42,7 +42,6 @@ __FBSDID("$FreeBSD$");
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sysexits.h>
 #include <termios.h>
 #include <unistd.h>
 
@@ -60,6 +59,8 @@ int	 d_flag;	/*    -d: direct connection */
 int	 F_flag;	/*    -F: restart without checking mtime  */
 char	*f_filename;	/*    -f: file to fetch */
 char	*h_hostname;	/*    -h: host to fetch from */
+int	 i_flag;	/*    -i: specify input file for mtime comparison */
+char	*i_filename;	/*        name of input file */
 int	 l_flag;	/*    -l: link rather than copy file: URLs */
 int	 m_flag;	/* -[Mm]: mirror mode */
 char	*N_filename;	/*    -N: netrc file name */
@@ -381,6 +382,14 @@ fetch(char *URL, const char *path)
 		if (A_flag)
 			strcat(flags, "A");
 		timeout = T_secs ? T_secs : http_timeout;
+		if (i_flag) {
+			if (stat(i_filename, &sb)) {
+				warn("%s: stat()", i_filename);
+				goto failure;
+			}
+			url->ims_time = sb.st_mtime;
+			strcat(flags, "i");
+		}
 	}
 
 	/* set the protocol timeout. */
@@ -448,7 +457,14 @@ fetch(char *URL, const char *path)
 		goto signal;
 	if (f == NULL) {
 		warnx("%s: %s", URL, fetchLastErrString);
-		goto failure;
+		if (i_flag && strcmp(url->scheme, SCHEME_HTTP) == 0
+		    && fetchLastErrCode == FETCH_OK
+		    && strcmp(fetchLastErrString, "Not Modified") == 0) {
+			/* HTTP Not Modified Response, return OK. */
+			r = 0;
+			goto done;
+		} else
+			goto failure;
 	}
 	if (sigint)
 		goto signal;
@@ -710,10 +726,11 @@ fetch(char *URL, const char *path)
 static void
 usage(void)
 {
-	fprintf(stderr, "%s\n%s\n%s\n",
-	    "usage: fetch [-146AFMPRUadlmnpqrsv] [-N netrc] [-o outputfile]",
-	    "             [-S bytes] [-B bytes] [-T seconds] [-w seconds]",
-	    "             [-h host -f file [-c dir] | URL ...]");
+	fprintf(stderr, "%s\n%s\n%s\n%s\n",
+"usage: fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [-N file] [-o file] [-S bytes]",
+"       [-T seconds] [-w seconds] [-i file] URL ...",
+"       fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [-N file] [-o file] [-S bytes]",
+"       [-T seconds] [-w seconds] [-i file] -h host -f file [-c dir]");
 }
 
 
@@ -730,7 +747,7 @@ main(int argc, char *argv[])
 	int c, e, r;
 
 	while ((c = getopt(argc, argv,
-	    "146AaB:bc:dFf:Hh:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
+	    "146AaB:bc:dFf:Hh:i:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
 		switch (c) {
 		case '1':
 			once_flag = 1;
@@ -775,6 +792,10 @@ main(int argc, char *argv[])
 		case 'h':
 			h_hostname = optarg;
 			break;
+		case 'i':
+			i_flag = 1;
+			i_filename = optarg;
+			break;
 		case 'l':
 			l_flag = 1;
 			break;
@@ -842,7 +863,7 @@ main(int argc, char *argv[])
 			break;
 		default:
 			usage();
-			exit(EX_USAGE);
+			exit(1);
 		}
 
 	argc -= optind;
@@ -851,7 +872,7 @@ main(int argc, char *argv[])
 	if (h_hostname || f_filename || c_dirname) {
 		if (!h_hostname || !f_filename || argc) {
 			usage();
-			exit(EX_USAGE);
+			exit(1);
 		}
 		/* XXX this is a hack. */
 		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
@@ -864,7 +885,7 @@ main(int argc, char *argv[])
 
 	if (!argc) {
 		usage();
-		exit(EX_USAGE);
+		exit(1);
 	}
 
 	/* allocate buffer */
@@ -905,10 +926,10 @@ main(int argc, char *argv[])
 		} else if (stat(o_filename, &sb) == -1) {
 			if (errno == ENOENT) {
 				if (argc > 1)
-					errx(EX_USAGE, "%s is not a directory",
+					errx(1, "%s is not a directory",
 					    o_filename);
 			} else {
-				err(EX_IOERR, "%s", o_filename);
+				err(1, "%s", o_filename);
 			}
 		} else {
 			if (sb.st_mode & S_IFDIR)