Something similar to this perhaps ?
Not fully tested yet, but it should avoid the race of trying to
unlink tempfile several times, and also fix the file name in error messages.
Index: xinstall.c
===================================================================
RCS file: /cvs/src/usr.bin/xinstall/xinstall.c,v
retrieving revision 1.68
diff -u -p -r1.68 xinstall.c
--- xinstall.c 8 Feb 2019 12:53:44 -0000 1.68
+++ xinstall.c 10 Feb 2019 14:53:49 -0000
@@ -222,6 +222,7 @@ install(char *from_name, char *to_name,
struct timespec ts[2];
int devnull, from_fd, to_fd, serrno, files_match = 0;
char *p;
+ char *target_name = tempfile;
(void)memset((void *)&from_sb, 0, sizeof(from_sb));
(void)memset((void *)&to_sb, 0, sizeof(to_sb));
@@ -311,10 +312,14 @@ install(char *from_name, char *to_name,
} else {
files_match = 1;
(void)unlink(tempfile);
+ target_name = to_name;
+ (void)close(temp_fd);
}
}
- (void)close(to_fd);
- to_fd = temp_fd;
+ if (!files_match) {
+ (void)close(to_fd);
+ to_fd = temp_fd;
+ }
}
/*
@@ -333,13 +338,15 @@ install(char *from_name, char *to_name,
if ((gid != (gid_t)-1 || uid != (uid_t)-1) &&
fchown(to_fd, uid, gid)) {
serrno = errno;
- (void)unlink(tempfile);
- errx(1, "%s: chown/chgrp: %s", tempfile, strerror(serrno));
+ if (target_name == tempfile)
+ (void)unlink(tempfile);
+ errx(1, "%s: chown/chgrp: %s", target_name, strerror(serrno));
}
if (fchmod(to_fd, mode)) {
serrno = errno;
- (void)unlink(tempfile);
- errx(1, "%s: chmod: %s", tempfile, strerror(serrno));
+ if (target_name == tempfile)
+ (void)unlink(tempfile);
+ errx(1, "%s: chmod: %s", target_name, strerror(serrno));
}
/*
@@ -349,7 +356,7 @@ install(char *from_name, char *to_name,
if (fchflags(to_fd,
flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
if (errno != EOPNOTSUPP || (from_sb.st_flags & ~UF_NODUMP) != 0)
- warnx("%s: chflags: %s", tempfile, strerror(errno));
+ warnx("%s: chflags: %s", target_name, strerror(errno));
}
if (flags & USEFSYNC)
