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diff --git a/usr.bin/xinstall/install.1 b/usr.bin/xinstall/install.1
--- a/usr.bin/xinstall/install.1
+++ b/usr.bin/xinstall/install.1
@@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd August 4, 2022
+.Dd April 10, 2024
.Dt INSTALL 1
.Os
.Sh NAME
@@ -225,16 +225,18 @@
except if the target file does not already exist or is different,
then preserve the access and modification times of the source file.
.It Fl S
-Safe copy.
-Normally,
+Flush each file to disk after copying.
+This has a non-negligible impact on performance, but reduces the risk
+of being left with a partial file if the system crashes or loses power
+shortly after
.Nm
-unlinks an existing target before installing the new file.
-With the
+runs.
+.Pp
+Historically,
.Fl S
-flag a temporary file is used and then renamed to be
-the target.
-The reason this is safer is that if the copy or
-rename fails, the existing target is left untouched.
+also enabled the use of temporary files to ensure atomicity when
+replacing an existing target.
+Temporary files are no longer optional.
.It Fl s
.Nm
exec's the command
@@ -300,15 +302,7 @@
.Sh FILES
.Bl -tag -width "INS@XXXXXX" -compact
.It Pa INS@XXXXXX
-If either
-.Fl S
-option is specified, or the
-.Fl C
-or
-.Fl p
-option is used in conjunction with the
-.Fl s
-option, temporary files named
+Temporary files named
.Pa INS@XXXXXX ,
where
.Pa XXXXXX
diff --git a/usr.bin/xinstall/xinstall.c b/usr.bin/xinstall/xinstall.c
--- a/usr.bin/xinstall/xinstall.c
+++ b/usr.bin/xinstall/xinstall.c
@@ -144,7 +144,6 @@
static int compare(int, const char *, size_t, int, const char *, size_t,
char **);
static char *copy(int, const char *, int, const char *, off_t);
-static int create_newfile(const char *, int, struct stat *);
static int create_tempfile(const char *, char *, size_t);
static char *quiet_mktemp(char *template);
static char *digest_file(const char *);
@@ -328,10 +327,6 @@
}
}
- /* need to make a temp copy so we can compare stripped version */
- if (docompare && dostrip)
- safecopy = 1;
-
/* get group and owner id's */
if (group != NULL && !dounpriv) {
if (gid_from_group(group, &gid) == -1) {
@@ -572,7 +567,7 @@
char tmpl[MAXPATHLEN];
int ret;
- if (safecopy && target_sb != NULL) {
+ if (target_sb != NULL) {
(void)snprintf(tmpl, sizeof(tmpl), "%s.inst.XXXXXX", to_name);
/* This usage is safe. */
if (quiet_mktemp(tmpl) == NULL)
@@ -619,7 +614,7 @@
{
char tmpl[MAXPATHLEN];
- if (safecopy && target_sb != NULL) {
+ if (target_sb != NULL) {
(void)snprintf(tmpl, sizeof(tmpl), "%s.inst.XXXXXX", to_name);
/* This usage is safe. */
if (quiet_mktemp(tmpl) == NULL)
@@ -808,7 +803,7 @@
struct stat from_sb, temp_sb, to_sb;
struct timespec tsb[2];
int devnull, files_match, from_fd, serrno, stripped, target;
- int tempcopy, temp_fd, to_fd;
+ int temp_fd, to_fd;
char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
char *digestresult;
@@ -843,16 +838,6 @@
target = (lstat(to_name, &to_sb) == 0);
if (dolink) {
- if (target && !safecopy) {
- if (to_sb.st_mode & S_IFDIR && rmdir(to_name) == -1)
- err(EX_OSERR, "%s", to_name);
-#if HAVE_STRUCT_STAT_ST_FLAGS
- if (to_sb.st_flags & NOCHANGEBITS)
- (void)chflags(to_name,
- to_sb.st_flags & ~NOCHANGEBITS);
-#endif
- unlink(to_name);
- }
makelink(from_name, to_name, target ? &to_sb : NULL);
return;
}
@@ -863,9 +848,6 @@
return;
}
- /* Only copy safe if the target exists. */
- tempcopy = safecopy && target;
-
if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
err(EX_OSERR, "%s", from_name);
@@ -886,40 +868,32 @@
}
if (!files_match) {
- if (tempcopy) {
- to_fd = create_tempfile(to_name, tempfile,
- sizeof(tempfile));
- if (to_fd < 0)
- err(EX_OSERR, "%s", tempfile);
- } else {
- if ((to_fd = create_newfile(to_name, target,
- &to_sb)) < 0)
- err(EX_OSERR, "%s", to_name);
- if (verbose)
- (void)printf("install: %s -> %s\n",
- from_name, to_name);
- }
+ to_fd = create_tempfile(to_name, tempfile,
+ sizeof(tempfile));
+ if (to_fd < 0)
+ err(EX_OSERR, "%s", tempfile);
if (!devnull) {
- if (dostrip)
- stripped = strip(tempcopy ? tempfile : to_name,
- to_fd, from_name, &digestresult);
- if (!stripped)
- digestresult = copy(from_fd, from_name, to_fd,
- tempcopy ? tempfile : to_name, from_sb.st_size);
+ if (dostrip) {
+ stripped = strip(tempfile, to_fd, from_name,
+ &digestresult);
+ }
+ if (!stripped) {
+ digestresult = copy(from_fd, from_name, to_fd,
+ tempfile, from_sb.st_size);
+ }
}
}
if (dostrip) {
if (!stripped)
- (void)strip(tempcopy ? tempfile : to_name, to_fd,
- NULL, &digestresult);
+ (void)strip(tempfile, to_fd, NULL, &digestresult);
/*
* Re-open our fd on the target, in case
* we did not strip in-place.
*/
close(to_fd);
- to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
+ to_fd = open(tempfile, O_RDONLY, 0);
if (to_fd < 0)
err(EX_OSERR, "stripping %s", to_name);
}
@@ -963,16 +937,16 @@
digestresult = digest_file(tempfile);
/*
- * Move the new file into place if doing a safe copy
- * and the files are different (or just not compared).
+ * Move the new file into place if the files are different (or
+ * just not compared).
*/
- if (tempcopy && !files_match) {
+ if (!files_match) {
#if HAVE_STRUCT_STAT_ST_FLAGS
/* Try to turn off the immutable bits. */
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
#endif
- if (dobackup) {
+ if (target && dobackup) {
if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
suffix) != strlen(to_name) + strlen(suffix)) {
unlink(tempfile);
@@ -1222,65 +1196,6 @@
return (mkstemp(temp));
}
-/*
- * create_newfile --
- * create a new file, overwriting an existing one if necessary
- */
-static int
-create_newfile(const char *path, int target, struct stat *sbp)
-{
- char backup[MAXPATHLEN];
- int saved_errno = 0;
- int newfd;
-
- if (target) {
- /*
- * Unlink now... avoid ETXTBSY errors later. Try to turn
- * off the append/immutable bits -- if we fail, go ahead,
- * it might work.
- */
-#if HAVE_STRUCT_STAT_ST_FLAGS
- if (sbp->st_flags & NOCHANGEBITS)
- (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
-#endif
-
- if (dobackup) {
- if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
- path, suffix) != strlen(path) + strlen(suffix)) {
- saved_errno = errno;
-#if HAVE_STRUCT_STAT_ST_FLAGS
- if (sbp->st_flags & NOCHANGEBITS)
- (void)chflags(path, sbp->st_flags);
-#endif
- errno = saved_errno;
- errx(EX_OSERR, "%s: backup filename too long",
- path);
- }
- (void)snprintf(backup, MAXPATHLEN, "%s%s",
- path, suffix);
- if (verbose)
- (void)printf("install: %s -> %s\n",
- path, backup);
- if (rename(path, backup) < 0) {
- saved_errno = errno;
-#if HAVE_STRUCT_STAT_ST_FLAGS
- if (sbp->st_flags & NOCHANGEBITS)
- (void)chflags(path, sbp->st_flags);
-#endif
- errno = saved_errno;
- err(EX_OSERR, "rename: %s to %s", path, backup);
- }
- } else
- if (unlink(path) < 0)
- saved_errno = errno;
- }
-
- newfd = open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR);
- if (newfd < 0 && saved_errno != 0)
- errno = saved_errno;
- return newfd;
-}
-
/*
* copy --
* copy from one file to another

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