[cmdline] Match user expectations for &&, ||, goto, and exit
The && and || operators should be left-associative, since that is how
they are treated in most other languages (including C and Unix
shell). For example, in the command:
dhcp net0 && goto dhcp_ok || echo No DHCP on net0
if the "dhcp net0" fails then the "echo" should be executed.
After an "exit" or a successful "goto", further commands on the same
line should never be executed. For example:
goto somewhere && echo This should never be printed
exit 0 && echo This should never be printed
exit 1 && echo This should never be printed
An "exit" should cause the current shell or script to terminate and
return the specified exit status to its caller. For example:
chain test.ipxe && echo Success || echo Failure
[in test.ipxe]
#!ipxe
exit 0
should echo "Success".
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The "shell" command allows a script to enter an interactive shell,
which is potentially useful for troubleshooting.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Allow "set" command to take an empty value
Allow "set <variable>" to be used to set the variable to an empty
value, if permitted by the setting type. Note that some settings
backends do not differentiate between an empty value and a
non-existent value, so this may or may not be equivalent to "clear
<variable>".
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[autoboot] Merge "netboot" command into "autoboot"
Allow "autoboot" to accept an optional list of network devices, and
remove the "netboot" command. This saves around 130 bytes.
The "netboot" command has existed for approximately 48 hours, so its
removal should not cause backwards compatibility issues for anyone.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
There are several points in the iPXE codebase where
list_for_each_entry() is (ab)used to extract only the first entry from
a list. Add a macro list_first_entry() to make this code easier to
read.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[hci] Use http://ipxe.org/<errno> instead of raw error numbers
Users tend to gloss over cryptic-looking error messages such as
"Boot failed: Exec format error (Error 0x2e852001)"
In particular, users tend not to report the error number, which is the
single most useful piece of diagnostic information in an iPXE error
message. Try replacing the "Error 0x2e852001" portion with a URL,
giving
"Boot failed: Exec format error (http://ipxe.org/2e852001)"
in the hope that users will, upon seeing something that is
recognisably a URL, try viewing it in a web browser. Such users will
be greeted by a web page containing a more detailed description of the
error (automatically generated from the einfo text), including links
to each line of code that might generate the error, and a section for
additional user-contributed notes. At the time of writing, a user who
visits http://ipxe.org/2e852001 would see a note saying
"This error usually indicates that the SAN disk is empty, and does
not yet contain a bootable operating system."
which may be more useful than "Exec format error (Error 0x2e852001)".
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Modify "set" command to allow space separated values
Allow multiple, space separated values (such as kernel arguments,
passed via DHCP) to be assigned to an identifier using the "set"
command.
Originally-implemented-by: Aaron Brooks <aaron@brooks1.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Support qemu-like arguments for network setup:
--net driver_name[,setting=value]*
and global settings:
--settings setting=value[,setting=value]*
Signed-off-by: Piotr Jaroszyński <p.jaroszynski@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The "dhcp" command now accepts a list of interfaces to try until one
succeeds. For example:
iPXE> dhcp net0 net1 net2
If no interfaces are specified, all interfaces will be tried.
Note that interfaces that fail to DHCP are closed in order to avoid
memory exhaustion. This behavior differs from the previous "dhcp"
command implementation but should not affect any existing scripts
since a "dhcp" command failure would in any case cause the script to
abort.
Originally-implemented-by: Lars Kellogg-Stedman <lars@oddbit.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[hci] Continue processing while prompting for shell banner
Continue calling step() while displaying the shell banner. This
potentially allows TCP connections to close gracefully after a failed
boot attempt.
Inspired-by: Guo-Fu Tseng <cooldavid@cooldavid.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Make Ctrl-D delete a setting, because the Text User Interface (tui)
previously provided no way to delete a setting. Also, update the
on-screen instructions to describe the new feature. Deleting settings
is especially important for settings stored in precious nonvolatile
storage.
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Implement jump scrolling with "..." displayed where the settings list
continues off-screen, because there are now too many settings to fit
on screen in the "config ..." text user interface.
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Access to the gpxe.org and etherboot.org domains and associated
resources has been revoked by the registrant of the domain. Work
around this problem by renaming project from gPXE to iPXE, and
updating URLs to match.
Also update README, LOG and COPYRIGHTS to remove obsolete information.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[iwmgmt] Add wireless management commands and text for common errors
Add commands `iwstat' (to list 802.11-specific status information for
802.11 devices) and `iwlist' (to scan for available networks and print
a list along with security information).
Signed-off-by: Marty Connor <mdc@etherboot.org>
ifcommon_exec() was long-ago marked as __attribute__((regparm(2))) in
order to minimise the size of functions that call into it. Since
then, gPXE has added -mregparm=3 as a general compilation option, and
this "optimisation" is now counter-productive.
Change (and simplify) the prototype to minimise code size given the
current compilation conditions.
[hci] Expose ifcommon_exec() in a local header so wireless commands can use it
This keeps code size down, since the wireless interface management
commands have the same command-line interface and overall structure as
the wired commands.
Signed-off-by: Michael Brown <mcb30@etherboot.org>
[netdevice] Add mechanism for reporting detailed link status codes
Expand the NETDEV_LINK_UP bit into a link_rc status code field,
allowing specific reasons for link failure to be reported via
"ifstat".
Originally-authored-by: Joshua Oreman <oremanj@rwcr.net>
[image] Modify imgfree command to accept an argument
This resolves potential difficulties occurring when more than one script
is used. Total cost: 88 bytes uncompressed.
Signed-off-by: Michael Brown <mcb30@etherboot.org>
[segment] Add "Requested memory not available" error message
prep_segment() can sometimes fail because an image requests memory
that is already in use by gPXE. This will happen if
e.g. undionly.kpxe is used to boot memtest86; the memtest86 image is
an old-format kernel that needs to be loaded at 9000:0000, but this
area of memory may well already be in use by the underlying PXE stack.
Add a human-friendly error message, so that the cause is more
immediately visible.
[tables] Incorporate table data type information into table definition
Eliminate the potential for mismatches between table names and the
table entry data type by incorporating the data type into the
definition of the table, rather than specifying it explicitly in each
table accessor method.
[tables] Redefine methods for accessing linker tables
Intel's C compiler (icc) chokes on the zero-length arrays that we
currently use as part of the mechanism for accessing linker table
entries. Abstract away the zero-length arrays, to make a port to icc
easier.
Introduce macros such as for_each_table_entry() to simplify the common
case of iterating over all entries in a linker table.
Represent table names as #defined string constants rather than
unquoted literals; this avoids visual confusion between table names
and C variable or type names, and also allows us to force a
compilation error in the event of incorrect table names.
Michael Brown