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Matthias Bolte 2010-11-12 15:36:53 +01:00
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@ -1,18 +1,19 @@
-*- buffer-read-only: t -*- vi: set ro: -*- buffer-read-only: t -*- vi: set ro:
DO NOT EDIT THIS FILE! IT IS GENERATED AUTOMATICALLY! DO NOT EDIT THIS FILE! IT IS GENERATED AUTOMATICALLY!
Libvirt contributor guidelines
==============================
Contributor guidelines
======================
General tips for contributing patches General tips for contributing patches
===================================== =====================================
(1) Discuss any large changes on the mailing list first. Post patches early and
listen to feedback.
(1) Discuss any large changes on the mailing list first. Post patches (2) Post patches in unified diff format. A command similar to this should work:
early and listen to feedback.
(2) Post patches in unified diff format. A command similar to this
should work:
diff -urp libvirt.orig/ libvirt.modified/ > libvirt-myfeature.patch diff -urp libvirt.orig/ libvirt.modified/ > libvirt-myfeature.patch
@ -20,15 +21,15 @@ or:
git diff > libvirt-myfeature.patch git diff > libvirt-myfeature.patch
(3) Split large changes into a series of smaller patches, self-contained (3) Split large changes into a series of smaller patches, self-contained if
if possible, with an explanation of each patch and an explanation of how possible, with an explanation of each patch and an explanation of how the
the sequence of patches fits together. sequence of patches fits together.
(4) Make sure your patches apply against libvirt GIT. Developers (4) Make sure your patches apply against libvirt GIT. Developers only follow GIT
only follow GIT and don't care much about released versions. and don't care much about released versions.
(5) Run the automated tests on your code before submitting any changes. (5) Run the automated tests on your code before submitting any changes. In
In particular, configure with compile warnings set to -Werror: particular, configure with compile warnings set to -Werror:
./configure --enable-compile-warnings=error ./configure --enable-compile-warnings=error
@ -47,28 +48,29 @@ VIR_TEST_DEBUG may provide larger amounts of information:
VIR_TEST_DEBUG=1 make check (or) VIR_TEST_DEBUG=1 make check (or)
VIR_TEST_DEBUG=2 make check VIR_TEST_DEBUG=2 make check
Also, individual tests can be run from inside the 'tests/' directory, like: Also, individual tests can be run from inside the "tests/" directory, like:
./qemuxml2xmltest ./qemuxml2xmltest
(6) Update tests and/or documentation, particularly if you are adding (6) Update tests and/or documentation, particularly if you are adding a new
a new feature or changing the output of a program. feature or changing the output of a program.
There is more on this subject, including lots of links to background
reading on the subject, on this page:
There is more on this subject, including lots of links to background reading
on the subject, on
Richard Jones' guide to working with open source projects
http://et.redhat.com/~rjones/how-to-supply-code-to-open-source-projects/ http://et.redhat.com/~rjones/how-to-supply-code-to-open-source-projects/
Code indentation Code indentation
================ ================
Libvirt's C source code generally adheres to some basic code-formatting Libvirt's C source code generally adheres to some basic code-formatting
conventions. The existing code base is not totally consistent on this conventions. The existing code base is not totally consistent on this front,
front, but we do prefer that contributed code be formatted similarly. but we do prefer that contributed code be formatted similarly. In short, use
In short, use spaces-not-TABs for indentation, use 4 spaces for each spaces-not-TABs for indentation, use 4 spaces for each indentation level, and
indentation level, and other than that, follow the K&R style. other than that, follow the K&R style.
If you use Emacs, add the following to one of one of your start-up files If you use Emacs, add the following to one of one of your start-up files
(e.g., ~/.emacs), to help ensure that you get indentation right: (e.g., ~/.emacs), to help ensure that you get indentation right:
@ -82,15 +84,15 @@ If you use Emacs, add the following to one of one of your start-up files
(setq c-indent-level 4) (setq c-indent-level 4)
(setq c-basic-offset 4)) (setq c-basic-offset 4))
(add-hook 'c-mode-hook (add-hook 'c-mode-hook
'(lambda () (if (string-match "/libvirt" (buffer-file-name)) '(lambda () (if (string-match "/libvirt" (buffer-file-name))
(libvirt-c-mode)))) (libvirt-c-mode))))
Code formatting (especially for new code) Code formatting (especially for new code)
========================================= =========================================
With new code, we can be even more strict. With new code, we can be even more strict. Please apply the following function
Please apply the following function (using GNU indent) to any new code. (using GNU indent) to any new code. Note that this also gives you an idea of
Note that this also gives you an idea of the type of spacing we prefer the type of spacing we prefer around operators and keywords:
around operators and keywords:
indent-libvirt() indent-libvirt()
{ {
@ -99,66 +101,63 @@ around operators and keywords:
--no-tabs "$@" --no-tabs "$@"
} }
Note that sometimes you'll have to post-process that output further, by Note that sometimes you'll have to post-process that output further, by piping
piping it through "expand -i", since some leading TABs can get through. it through "expand -i", since some leading TABs can get through. Usually
Usually they're in macro definitions or strings, and should be converted they're in macro definitions or strings, and should be converted anyhow.
anyhow.
Curly braces Curly braces
============ ============
Omit the curly braces around an "if", "while", "for" etc. body only when that Omit the curly braces around an "if", "while", "for" etc. body only when that
body occupies a single line. In every other case we require the braces. This body occupies a single line. In every other case we require the braces. This
ensures that it is trivially easy to identify a single-*statement* loop: each ensures that it is trivially easy to identify a single-'statement' loop: each
has only one *line* in its body. has only one 'line' in its body.
Omitting braces with a single-line body is fine: Omitting braces with a single-line body is fine:
while (expr) // one-line body -> omitting curly braces is ok while (expr) // one-line body -> omitting curly braces is ok
single_line_stmt (); single_line_stmt();
However, the moment your loop/if/else body extends onto a second line, for However, the moment your loop/if/else body extends onto a second line, for
whatever reason (even if it's just an added comment), then you should add whatever reason (even if it's just an added comment), then you should add
braces. Otherwise, it would be too easy to insert a statement just before that braces. Otherwise, it would be too easy to insert a statement just before that
comment (without adding braces), thinking it is already a multi-statement comment (without adding braces), thinking it is already a multi-statement loop:
loop:
while (true) // BAD! multi-line body with no braces while (true) // BAD! multi-line body with no braces
/* comment... */ /* comment... */
single_line_stmt (); single_line_stmt();
Do this instead: Do this instead:
while (true) { // Always put braces around a multi-line body. while (true) { // Always put braces around a multi-line body.
/* comment... */ /* comment... */
single_line_stmt (); single_line_stmt();
} }
There is one exception: when the second body line is not at the same There is one exception: when the second body line is not at the same
indentation level as the first body line: indentation level as the first body line:
if (expr) if (expr)
die ("a diagnostic that would make this line" die("a diagnostic that would make this line"
" extend past the 80-column limit")); " extend past the 80-column limit"));
It is safe to omit the braces in the code above, since the further-indented It is safe to omit the braces in the code above, since the further-indented
second body line makes it obvious that this is still a single-statement body. second body line makes it obvious that this is still a single-statement body.
To reiterate, don't do this: To reiterate, don't do this:
if (expr) // BAD: no braces around... if (expr) // BAD: no braces around...
while (expr_2) { // ... a multi-line body while (expr_2) { // ... a multi-line body
... ...
} }
Do this, instead: Do this, instead:
if (expr) { if (expr) {
while (expr_2) { while (expr_2) {
... ...
} }
} }
However, there is one exception in the other direction, when even a one-line However, there is one exception in the other direction, when even a one-line
block should have braces. That occurs when that one-line, brace-less block is block should have braces. That occurs when that one-line, brace-less block is
@ -167,47 +166,47 @@ case, either put braces around the "else" block, or negate the "if"-condition
and swap the bodies, putting the one-line block first and making the longer, and swap the bodies, putting the one-line block first and making the longer,
multi-line block be the "else" block. multi-line block be the "else" block.
if (expr) { if (expr) {
... ...
... ...
} }
else else
x = y; // BAD: braceless "else" with braced "then" x = y; // BAD: braceless "else" with braced "then"
This is preferred, especially when the multi-line body is more than a few This is preferred, especially when the multi-line body is more than a few
lines long, because it is easier to read and grasp the semantics of an if- lines long, because it is easier to read and grasp the semantics of an
then-else block when the simpler block occurs first, rather than after the if-then-else block when the simpler block occurs first, rather than after the
more involved block: more involved block:
if (!expr) if (!expr)
x = y; // putting the smaller block first is more readable x = y; // putting the smaller block first is more readable
else { else {
... ...
... ...
} }
If you'd rather not negate the condition, then at least add braces: If you'd rather not negate the condition, then at least add braces:
if (expr) { if (expr) {
... ...
... ...
} else { } else {
x = y; x = y;
} }
Preprocessor Preprocessor
============ ============
For variadic macros, stick with C99 syntax: For variadic macros, stick with C99 syntax:
#define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__) #define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__)
Use parenthesis when checking if a macro is defined, and use Use parenthesis when checking if a macro is defined, and use indentation to
indentation to track nesting: track nesting:
#if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE) #if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE)
# define fallocate(a,ignored,b,c) posix_fallocate(a,b,c) # define fallocate(a,ignored,b,c) posix_fallocate(a,b,c)
#endif #endif
C types C types
@ -216,199 +215,235 @@ Use the right type.
Scalars Scalars
------- -------
If you're using "int" or "long", odds are good that there's a better type. - If you're using "int" or "long", odds are good that there's a better type.
If a variable is counting something, be sure to declare it with an
unsigned type.
If it's memory-size-related, use size_t (use ssize_t only if required).
If it's file-size related, use uintmax_t, or maybe off_t.
If it's file-offset related (i.e., signed), use off_t.
If it's just counting small numbers use "unsigned int";
(on all but oddball embedded systems, you can assume that that
type is at least four bytes wide).
If a variable has boolean semantics, give it the "bool" type
and use the corresponding "true" and "false" macros. It's ok
to include <stdbool.h>, since libvirt's use of gnulib ensures
that it exists and is usable.
In the unusual event that you require a specific width, use a
standard type like int32_t, uint32_t, uint64_t, etc.
While using "bool" is good for readability, it comes with minor caveats: - If a variable is counting something, be sure to declare it with an unsigned
- Don't use "bool" in places where the type size must be constant across type.
all systems, like public interfaces and on-the-wire protocols. Note
that it would be possible (albeit wasteful) to use "bool" in libvirt's
logical wire protocol, since XDR maps that to its lower-level bool_t
type, which *is* fixed-size.
- Don't compare a bool variable against the literal, "true",
since a value with a logical non-false value need not be "1".
I.e., don't write "if (seen == true) ...". Rather, write "if (seen)...".
Of course, take all of the above with a grain of salt. If you're about - If it's memory-size-related, use "size_t" (use "ssize_t" only if required).
to use some system interface that requires a type like size_t, pid_t or
off_t, use matching types for any corresponding variables.
Also, if you try to use e.g., "unsigned int" as a type, and that - If it's file-size related, use uintmax_t, or maybe "off_t".
conflicts with the signedness of a related variable, sometimes
it's best just to use the *wrong* type, if "pulling the thread"
and fixing all related variables would be too invasive.
Finally, while using descriptive types is important, be careful not to - If it's file-offset related (i.e., signed), use "off_t".
go overboard. If whatever you're doing causes warnings, or requires
casts, then reconsider or ask for help. - If it's just counting small numbers use "unsigned int"; (on all but oddball
embedded systems, you can assume that that type is at least four bytes wide).
- If a variable has boolean semantics, give it the "bool" type and use the
corresponding "true" and "false" macros. It's ok to include <stdbool.h>, since
libvirt's use of gnulib ensures that it exists and is usable.
- In the unusual event that you require a specific width, use a standard type
like "int32_t", "uint32_t", "uint64_t", etc.
- While using "bool" is good for readability, it comes with minor caveats:
-- Don't use "bool" in places where the type size must be constant across all
systems, like public interfaces and on-the-wire protocols. Note that it would
be possible (albeit wasteful) to use "bool" in libvirt's logical wire
protocol, since XDR maps that to its lower-level "bool_t" type, which *is*
fixed-size.
-- Don't compare a bool variable against the literal, "true", since a value with
a logical non-false value need not be "1". I.e., don't write "if (seen ==
true) ...". Rather, write "if (seen)...".
Of course, take all of the above with a grain of salt. If you're about to use
some system interface that requires a type like "size_t", "pid_t" or "off_t",
use matching types for any corresponding variables.
Also, if you try to use e.g., "unsigned int" as a type, and that conflicts
with the signedness of a related variable, sometimes it's best just to use the
*wrong* type, if 'pulling the thread' and fixing all related variables would
be too invasive.
Finally, while using descriptive types is important, be careful not to go
overboard. If whatever you're doing causes warnings, or requires casts, then
reconsider or ask for help.
Pointers Pointers
-------- --------
Ensure that all of your pointers are "const-correct". Ensure that all of your pointers are 'const-correct'. Unless a pointer is used
Unless a pointer is used to modify the pointed-to storage, to modify the pointed-to storage, give it the "const" attribute. That way, the
give it the "const" attribute. That way, the reader knows reader knows up-front that this is a read-only pointer. Perhaps more
up-front that this is a read-only pointer. Perhaps more importantly, if we're diligent about this, when you see a non-const pointer,
importantly, if we're diligent about this, when you see a non-const you're guaranteed that it is used to modify the storage it points to, or it is
pointer, you're guaranteed that it is used to modify the storage aliased to another pointer that is.
it points to, or it is aliased to another pointer that is.
Low level memory management Low level memory management
=========================== ===========================
Use of the malloc/free/realloc/calloc APIs is deprecated in the libvirt Use of the malloc/free/realloc/calloc APIs is deprecated in the libvirt
codebase, because they encourage a number of serious coding bugs and do codebase, because they encourage a number of serious coding bugs and do not
not enable compile time verification of checks for NULL. Instead of these enable compile time verification of checks for NULL. Instead of these
routines, use the macros from memory.h routines, use the macros from memory.h
- eg to allocate a single object: - e.g. to allocate a single object:
virDomainPtr domain; virDomainPtr domain;
if (VIR_ALLOC(domain) < 0) { if (VIR_ALLOC(domain) < 0) {
virReportOOMError(); virReportOOMError();
return NULL; return NULL;
} }
- eg to allocate an array of objects
virDomainPtr domains; - e.g. to allocate an array of objects
int ndomains = 10;
if (VIR_ALLOC_N(domains, ndomains) < 0) { virDomainPtr domains;
virReportOOMError(); int ndomains = 10;
return NULL;
}
- eg to allocate an array of object pointers if (VIR_ALLOC_N(domains, ndomains) < 0) {
virReportOOMError();
return NULL;
}
virDomainPtr *domains;
int ndomains = 10;
if (VIR_ALLOC_N(domains, ndomains) < 0) {
virReportOOMError();
return NULL;
}
- eg to re-allocate the array of domains to be longer - e.g. to allocate an array of object pointers
virDomainPtr *domains;
int ndomains = 10;
if (VIR_ALLOC_N(domains, ndomains) < 0) {
virReportOOMError();
return NULL;
}
- e.g. to re-allocate the array of domains to be longer
ndomains = 20
if (VIR_REALLOC_N(domains, ndomains) < 0) {
virReportOOMError();
return NULL;
}
- e.g. to free the domain
VIR_FREE(domain);
ndomains = 20
if (VIR_REALLOC_N(domains, ndomains) < 0) {
virReportOOMError();
return NULL;
}
- eg to free the domain
VIR_FREE(domain);
File handling File handling
============= =============
Use of the close() API is deprecated in libvirt code base to help avoiding Use of the close() API is deprecated in libvirt code base to help avoiding
double-closing of a file descriptor. Instead of this API, use the macro from double-closing of a file descriptor. Instead of this API, use the macro from
files.h files.h
- eg close a file descriptor - e.g. close a file descriptor
if (VIR_CLOSE(fd) < 0) {
virReportSystemError(errno, _("failed to close file"));
}
- eg close a file descriptor in an error path, without losing the previous
"errno" value
VIR_FORCE_CLOSE(fd);
if (VIR_CLOSE(fd) < 0) {
virReportSystemError(errno, _("failed to close file"));
}
- eg close a file descriptor in an error path, without losing the previous
errno value
VIR_FORCE_CLOSE(fd);
String comparisons String comparisons
================== ==================
Do not use the strcmp, strncmp, etc functions directly. Instead use one of the
following semantically named macros
Do not use the strcmp, strncmp, etc functions directly. Instead use - For strict equality:
one of the following semantically named macros
- For strict equality: STREQ(a,b)
STRNEQ(a,b)
STREQ(a,b)
STRNEQ(a,b)
- For case insensitive equality:
STRCASEEQ(a,b)
STRCASENEQ(a,b)
- For strict equality of a substring: - For case insensitive equality:
STREQLEN(a,b,n) STRCASEEQ(a,b)
STRNEQLEN(a,b,n) STRCASENEQ(a,b)
- For case insensitive equality of a substring:
STRCASEEQLEN(a,b,n)
STRCASENEQLEN(a,b,n)
- For strict equality of a prefix: - For strict equality of a substring:
STREQLEN(a,b,n)
STRNEQLEN(a,b,n)
- For case insensitive equality of a substring:
STRCASEEQLEN(a,b,n)
STRCASENEQLEN(a,b,n)
- For strict equality of a prefix:
STRPREFIX(a,b)
STRPREFIX(a,b)
String copying String copying
============== ==============
Do not use the strncpy function. According to the man page, it does *not*
guarantee a NULL-terminated buffer, which makes it extremely dangerous to use.
Instead, use one of the functionally equivalent functions:
Do not use the strncpy function. According to the man page, it does virStrncpy(char *dest, const char *src, size_t n, size_t destbytes)
*not* guarantee a NULL-terminated buffer, which makes it extremely dangerous
to use. Instead, use one of the functionally equivalent functions:
- virStrncpy(char *dest, const char *src, size_t n, size_t destbytes) The first three arguments have the same meaning as for strncpy; namely the
The first three arguments have the same meaning as for strncpy; namely the destination, source, and number of bytes to copy, respectively. The last
destination, source, and number of bytes to copy, respectively. The last argument is the number of bytes available in the destination string; if a copy
argument is the number of bytes available in the destination string; if a of the source string (including a \0) will not fit into the destination, no
copy of the source string (including a \0) will not fit into the bytes are copied and the routine returns NULL. Otherwise, n bytes from the
destination, no bytes are copied and the routine returns NULL. source are copied into the destination and a trailing \0 is appended.
Otherwise, n bytes from the source are copied into the destination and a
trailing \0 is appended.
- virStrcpy(char *dest, const char *src, size_t destbytes) virStrcpy(char *dest, const char *src, size_t destbytes)
Use this variant if you know you want to copy the entire src string
into dest. Note that this is a macro, so arguments could be
evaluated more than once. This is equivalent to
virStrncpy(dest, src, strlen(src), destbytes)
- virStrcpyStatic(char *dest, const char *src) Use this variant if you know you want to copy the entire src string into dest.
Use this variant if you know you want to copy the entire src string Note that this is a macro, so arguments could be evaluated more than once.
into dest *and* you know that your destination string is a static string This is equivalent to virStrncpy(dest, src, strlen(src), destbytes)
(i.e. that sizeof(dest) returns something meaningful). Note that
this is a macro, so arguments could be evaluated more than once. This is
equivalent to virStrncpy(dest, src, strlen(src), sizeof(dest)).
virStrcpyStatic(char *dest, const char *src)
Use this variant if you know you want to copy the entire src string into dest
*and* you know that your destination string is a static string (i.e. that
sizeof(dest) returns something meaningful). Note that this is a macro, so
arguments could be evaluated more than once. This is equivalent to
virStrncpy(dest, src, strlen(src), sizeof(dest)).
Variable length string buffer Variable length string buffer
============================= =============================
If there is a need for complex string concatenations, avoid using the usual
If there is a need for complex string concatenations, avoid using sequence of malloc/strcpy/strcat/snprintf functions and make use of the
the usual sequence of malloc/strcpy/strcat/snprintf functions and virBuffer API described in buf.h
make use of the virBuffer API described in buf.h
eg typical usage is as follows: eg typical usage is as follows:
char * char *
somefunction(...) { somefunction(...)
{
virBuffer buf = VIR_BUFFER_INITIALIZER; virBuffer buf = VIR_BUFFER_INITIALIZER;
... ...
@ -432,11 +467,9 @@ eg typical usage is as follows:
Include files Include files
============= =============
There are now quite a large number of include files, both libvirt internal and
There are now quite a large number of include files, both libvirt external, and system includes. To manage all this complexity it's best to
internal and external, and system includes. To manage all this stick to the following general plan for all *.c source files:
complexity it's best to stick to the following general plan for all
*.c source files:
/* /*
* Copyright notice * Copyright notice
@ -461,59 +494,112 @@ complexity it's best to stick to the following general plan for all
#include "util.h" Any libvirt internal header files. #include "util.h" Any libvirt internal header files.
#include "buf.h" #include "buf.h"
static myInternalFunc () The actual code. static int
myInternalFunc() The actual code.
{ {
... ...
Of particular note: *DO NOT* include libvirt/libvirt.h or Of particular note: *Do not* include libvirt/libvirt.h or libvirt/virterror.h.
libvirt/virterror.h. It is included by "internal.h" already and there It is included by "internal.h" already and there are some special reasons why
are some special reasons why you cannot include these files you cannot include these files explicitly.
explicitly.
Printf-style functions Printf-style functions
====================== ======================
Whenever you add a new printf-style function, i.e., one with a format string
argument and following "..." in its prototype, be sure to use gcc's printf
attribute directive in the prototype. For example, here's the one for
virAsprintf, in util.h:
Whenever you add a new printf-style function, i.e., one with a format int virAsprintf(char **strp, const char *fmt, ...)
string argument and following "..." in its prototype, be sure to use ATTRIBUTE_FORMAT(printf, 2, 3);
gcc's printf attribute directive in the prototype. For example, here's
the one for virAsprintf, in util.h:
int virAsprintf(char **strp, const char *fmt, ...) This makes it so gcc's -Wformat and -Wformat-security options can do their
ATTRIBUTE_FMT_PRINTF(2, 3); jobs and cross-check format strings with the number and types of arguments.
This makes it so gcc's -Wformat and -Wformat-security options can do
their jobs and cross-check format strings with the number and types Use of goto
of arguments. ===========
The use of goto is not forbidden, and goto is widely used throughout libvirt.
While the uncontrolled use of goto will quickly lead to unmaintainable code,
there is a place for it in well structured code where its use increases
readability and maintainability. In general, if goto is used for error
recovery, it's likely to be ok, otherwise, be cautious or avoid it all
together.
The typical use of goto is to jump to cleanup code in the case of a long list
of actions, any of which may fail and cause the entire operation to fail. In
this case, a function will have a single label at the end of the function.
It's almost always ok to use this style. In particular, if the cleanup code
only involves free'ing memory, then having multiple labels is overkill.
VIR_FREE() and every function named XXXFree() in libvirt is required to handle
NULL as its arg. Thus you can safely call free on all the variables even if
they were not yet allocated (yes they have to have been initialized to NULL).
This is much simpler and clearer than having multiple labels.
There are a couple of signs that a particular use of goto is not ok:
- You're using multiple labels. If you find yourself using multiple labels,
you're strongly encouraged to rework your code to eliminate all but one of
them.
- The goto jumps back up to a point above the current line of code being
executed. Please use some combination of looping constructs to re-execute code
instead; it's almost certainly going to be more understandable by others. One
well-known exception to this rule is restarting an i/o operation following
EINTR.
- The goto jumps down to an arbitrary place in the middle of a function followed
by further potentially failing calls. You should almost certainly be using a
conditional and a block instead of a goto. Perhaps some of your function's
logic would be better pulled out into a helper function.
Libvirt committer guidelines Although libvirt does not encourage the Linux kernel wind/unwind style of
============================ multiple labels, there's a good general discussion of the issue archived at
The AUTHORS files indicates the list of people with commit access right KernelTrap
who can actually merge the patches. http://kerneltrap.org/node/553/2131
When using goto, please use one of these standard labels if it makes sense:
error: A path only taken upon return with an error code
cleanup: A path taken upon return with success code + optional error
no_memory: A path only taken upon return with an OOM error code
retry: If needing to jump upwards (eg retry on EINTR)
Libvirt committer guidelines
============================
The AUTHORS files indicates the list of people with commit access right who
can actually merge the patches.
The general rule for committing a patch is to make sure it has been reviewed The general rule for committing a patch is to make sure it has been reviewed
properly in the mailing-list first, usually if a couple of people gave an properly in the mailing-list first, usually if a couple of people gave an ACK
ACK or +1 to a patch and nobody raised an objection on the list it should or +1 to a patch and nobody raised an objection on the list it should be good
be good to go. If the patch touches a part of the code where you're not the to go. If the patch touches a part of the code where you're not the main
main maintainer or not have a very clear idea of how things work, it's better maintainer, or where you do not have a very clear idea of how things work,
to wait for a more authoritative feedback though. Before committing please it's better to wait for a more authoritative feedback though. Before
also rebuild locally and run 'make check syntax-check' and make sure they committing, please also rebuild locally, run 'make check syntax-check', and
don't raise error. Try to look for warnings too for example configure with make sure you don't raise errors. Try to look for warnings too; for example,
--enable-compile-warnings=error configure with
--enable-compile-warnings=error
which adds -Werror to compile flags, so no warnings get missed which adds -Werror to compile flags, so no warnings get missed
Exceptions to that 'review and approval on the list first' is fixing failures An exception to 'review and approval on the list first' is fixing failures to
to build: build:
- if a recently committed patch breaks compilation on a platform
or for a given driver then it's fine to commit a minimal fix - if a recently committed patch breaks compilation on a platform or for a given
directly without getting the review feedback first driver, then it's fine to commit a minimal fix directly without getting the
- similarly, if make check or make syntax-check breaks, if there is review feedback first
an obvious fix, it's fine to commit immediately
The patch should still be sent to the list (or tell what the fix was if - if make check or make syntax-check breaks, if there is an obvious fix, it's
trivial) and 'make check syntax-check' should pass too before committing fine to commit immediately. The patch should still be sent to the list (or
anything tell what the fix was if trivial), and 'make check syntax-check' should pass
Similar fixes for documentation and code comments can be managed too, before committing anything
in the same way, but still make sure they get reviewed if non-trivial.
- fixes for documentation and code comments can be managed in the same way, but
still make sure they get reviewed if non-trivial.

7
Makefile.am
View File

@ -56,6 +56,13 @@ NEWS: $(top_srcdir)/docs/news.xsl $(top_srcdir)/docs/news.html.in
| perl -pe 's/[ \t]+$$//' \ | perl -pe 's/[ \t]+$$//' \
> $@-t && mv $@-t $@ ; fi ); > $@-t && mv $@-t $@ ; fi );
$(top_srcdir)/HACKING: $(top_srcdir)/docs/hacking1.xsl $(top_srcdir)/docs/hacking2.xsl \
$(top_srcdir)/docs/wrapstring.xsl $(top_srcdir)/docs/hacking.html.in
-@(if [ -x $(XSLTPROC) ] ; then \
$(XSLTPROC) --nonet $(top_srcdir)/docs/hacking1.xsl $(top_srcdir)/docs/hacking.html.in | \
$(XSLTPROC) --nonet $(top_srcdir)/docs/hacking2.xsl - \
| perl -0777 -pe 's/\n\n+$$/\n/' \
> $@-t && mv $@-t $@ ; fi );
rpm: clean rpm: clean
@(unset CDPATH ; $(MAKE) dist && rpmbuild -ta $(distdir).tar.gz) @(unset CDPATH ; $(MAKE) dist && rpmbuild -ta $(distdir).tar.gz)

3
cfg.mk
View File

@ -486,3 +486,6 @@ _autogen:
# Exempt @...@ uses of these symbols. # Exempt @...@ uses of these symbols.
_makefile_at_at_check_exceptions = ' && !/(SCHEMA|SYSCONF)DIR/' _makefile_at_at_check_exceptions = ' && !/(SCHEMA|SYSCONF)DIR/'
# regenerate HACKING as part of the syntax-check
syntax-check: $(top_srcdir)/HACKING

28
docs/hacking1.xsl Normal file
View File

@ -0,0 +1,28 @@
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" encoding="UTF-8" indent="no"/>
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<!-- resolve b/i/code tags in a first pass, because they interfere with line
wrapping in the second pass -->
<xsl:template match="b">*<xsl:apply-templates/>*</xsl:template>
<xsl:template match="i">'<xsl:apply-templates/>'</xsl:template>
<xsl:template match="code">"<xsl:apply-templates/>"</xsl:template>
</xsl:stylesheet>

146
docs/hacking2.xsl Normal file
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@ -0,0 +1,146 @@
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:import href="wrapstring.xsl"/>
<xsl:output method="text" encoding="UTF-8" indent="no"/>
<xsl:strip-space elements="*"/>
<xsl:variable name="newline">
<xsl:text>
</xsl:text>
</xsl:variable>
<xsl:template match="/">
<xsl:text>-*- buffer-read-only: t -*- vi: set ro:
DO NOT EDIT THIS FILE! IT IS GENERATED AUTOMATICALLY!
</xsl:text>
<xsl:apply-templates/>
</xsl:template>
<!-- title -->
<xsl:template match="h1">
<xsl:text> </xsl:text>
<xsl:value-of select="normalize-space(.)"/>
<xsl:text>
</xsl:text>======================
</xsl:template>
<!-- output the current text node underlined -->
<xsl:template name="underline">
<xsl:param name="text" select="normalize-space(.)"/>
<xsl:param name="text-length" select="string-length($text)"/>
<xsl:param name="char" select="'='"/>
<xsl:param name="line" select="$char"/>
<xsl:choose>
<xsl:when test="$text-length > 1">
<xsl:call-template name="underline">
<xsl:with-param name="text" select="$text"/>
<xsl:with-param name="text-length" select="$text-length - 1"/>
<xsl:with-param name="char" select="$char"/>
<xsl:with-param name="line" select="concat($line,$char)"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$text"/>
<xsl:value-of select="$newline"/>
<xsl:value-of select="$line"/>
<xsl:value-of select="$newline"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="h2">
<xsl:value-of select="$newline"/>
<xsl:call-template name="underline"/>
</xsl:template>
<xsl:template match="h3">
<xsl:call-template name="underline">
<xsl:with-param name="char" select="'-'"/>
</xsl:call-template>
</xsl:template>
<!-- output text line wrapped at 80 chars -->
<xsl:template match="text()">
<xsl:call-template name="wrap-string">
<xsl:with-param name="str" select="normalize-space(.)"/>
<xsl:with-param name="wrap-col" select="80"/>
<xsl:with-param name="break-mark" select="$newline"/>
</xsl:call-template>
</xsl:template>
<xsl:template match="ol|ul|p">
<xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
</xsl:template>
<xsl:template match="ol/li">
<xsl:choose>
<xsl:when test=".//node()[position()=last()]/self::pre">(<xsl:value-of select="position()"/>) <xsl:apply-templates/>
</xsl:when>
<!-- only append two newlines when the last element isn't a pre element -->
<xsl:otherwise>(<xsl:value-of select="position()"/>) <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="ul/li">- <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
</xsl:template>
<xsl:template match="li/ul/li">-- <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
</xsl:template>
<!-- add newline before nested <ul> -->
<xsl:template match="li/ul"><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/><xsl:apply-templates/>
</xsl:template>
<xsl:template match="pre">
<xsl:choose>
<xsl:when test="starts-with(.,'&#xA;')"><xsl:value-of select="substring(.,2)"/><xsl:value-of select="$newline"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="."/><xsl:value-of select="$newline"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="a">
<xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
<xsl:text> </xsl:text><xsl:apply-templates/>
<xsl:value-of select="$newline"/>
<xsl:text> </xsl:text><xsl:value-of select="@href"/>
</xsl:template>
</xsl:stylesheet>

56
docs/wrapstring.xsl Normal file
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@ -0,0 +1,56 @@
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<!-- based on http://plasmasturm.org/log/xslwordwrap/ -->
<!-- Copyright 2010 Aristotle Pagaltzis; under the MIT licence -->
<!-- http://www.opensource.org/licenses/mit-license.php -->
<xsl:template name="wrap-string">
<xsl:param name="str" />
<xsl:param name="wrap-col" />
<xsl:param name="break-mark" />
<xsl:param name="pos" select="0" />
<xsl:choose>
<xsl:when test="contains( $str, ' ' )">
<xsl:variable name="first-word" select="substring-before( $str, ' ' )" />
<xsl:variable name="pos-now" select="$pos + 1 + string-length( $first-word )" />
<xsl:choose>
<xsl:when test="$pos > 0 and $pos-now >= $wrap-col">
<xsl:copy-of select="$break-mark" />
<xsl:call-template name="wrap-string">
<xsl:with-param name="str" select="$str" />
<xsl:with-param name="wrap-col" select="$wrap-col" />
<xsl:with-param name="break-mark" select="$break-mark" />
<xsl:with-param name="pos" select="0" />
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:if test="$pos > 0">
<xsl:text> </xsl:text>
</xsl:if>
<xsl:value-of select="$first-word" />
<xsl:call-template name="wrap-string">
<xsl:with-param name="str" select="substring-after( $str, ' ' )" />
<xsl:with-param name="wrap-col" select="$wrap-col" />
<xsl:with-param name="break-mark" select="$break-mark" />
<xsl:with-param name="pos" select="$pos-now" />
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:choose>
<xsl:when test="$pos + string-length( $str ) >= $wrap-col">
<xsl:copy-of select="$break-mark" />
</xsl:when>
<xsl:otherwise>
<xsl:if test="$pos > 0">
<xsl:text> </xsl:text>
</xsl:if>
</xsl:otherwise>
</xsl:choose>
<xsl:value-of select="$str" />
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>