Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-30 Thread Filipe Brandenburger 
Hi,

On Fri, May 29, 2015 at 6:04 PM, Michael Biebl mbi...@gmail.com wrote:
 I we assume, autconf-archive is installed, the resulting patch would
 look like the attached diff.
 For convenience sake, we could also ship a copy of
 /usr/share/aclocal/ax_normalize_path.m4 in our m4/ directory.

Yep... indeed autoconf-archive is the way to go.

I tested your patch with some configure options and confirmed it works
as expected. I also checked that it doesn't break distcheck or
anything, so I think it's good to go...

I'll resend it here including the embedded autoconf-archive file in a
format that's ready for git am.

Cheers,
Filipe
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-30 Thread Daniel Mack 
On 05/30/2015 08:50 AM, Mike Gilbert wrote:
 On Fri, May 29, 2015 at 8:05 PM, Daniel Mack dan...@zonque.org wrote:
 Make sure the variable set via --with-rootprefix= does not contain a
 trailing slash, so man pages can use entities like rootprefix;/lib
 without ending up having double slashes.
 ---
  configure.ac | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

 diff --git a/configure.ac b/configure.ac
 index 92654a6..55b73de 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -1396,7 +1396,8 @@ AC_ARG_WITH([zshcompletiondir],

  AC_ARG_WITH([rootprefix],
  AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix 
 for config files and kernel modules]),
 -[], [with_rootprefix=${ac_default_prefix}])
 +[with_rootprefix=`echo ${withval} | sed -e s,/*$,,`],
 +[with_rootprefix=${ac_default_prefix}])
 
 Why do you pipe it through sed when a simple shell parameter expansion would 
 do?
 
 with_rootprefix=${withval%/}

Isn't that's a bash'ism which we try to avoid at other places? FWIW, we
use sed to strip off trailing dashes from $host for EFI_ARCH. Also, that
one only replaces one trailing slash, not all of them.

Anyway, Michael's AX_NORMALIZE_PATH approach seems to do the right
thing, so let's go for that.


Thanks,
Daniel

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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-30 Thread Mike Gilbert 
On Fri, May 29, 2015 at 8:05 PM, Daniel Mack dan...@zonque.org wrote:
 Make sure the variable set via --with-rootprefix= does not contain a
 trailing slash, so man pages can use entities like rootprefix;/lib
 without ending up having double slashes.
 ---
  configure.ac | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

 diff --git a/configure.ac b/configure.ac
 index 92654a6..55b73de 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -1396,7 +1396,8 @@ AC_ARG_WITH([zshcompletiondir],

  AC_ARG_WITH([rootprefix],
  AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix for 
 config files and kernel modules]),
 -[], [with_rootprefix=${ac_default_prefix}])
 +[with_rootprefix=`echo ${withval} | sed -e s,/*$,,`],
 +[with_rootprefix=${ac_default_prefix}])

Why do you pipe it through sed when a simple shell parameter expansion would do?

with_rootprefix=${withval%/}
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-30 Thread Christian Seiler 
On 05/30/2015 12:42 PM, Daniel Mack wrote:
 On 05/30/2015 12:31 PM, Christian Seiler wrote:
 Speaking of: using 'echo' for shell scripting is problematic, because
 while bash, busybox's sh, mksh, pdksh and zsh don't interpret escape
 sequences (\n, \0oo, ...) by default when using echo and invoked as
 /bin/sh, dash and ash do. (Note that e.g. dash ist default on Debian,
 so it's not like this is something theoretical.) Also, when invoked as
 their proper name (not as /bin/sh), only bash and busybox's shell do
 not interpret escape sequences by default with echo. (In short: it's a
 mess.)
 
 It's a mess indeed. Now we only need a POSIX compliant way to strip
 _all_ trailing dashes from a string, then we can get rid of that one
 occurrence of 'sed' in configure.ac :)

Define once:

# (local variables in functions are a bashism, don't use them, but
# name global variable in such a way that it won't clash with
# anything else)
strip_trailing_slashes()
{
_strip_trailing_slashes_value=$1
while [[ ${_strip_trailing_slashes_value} != 
${_strip_trailing_slashes_value%/} ]] ; do

_strip_trailing_slashes_value=${_strip_trailing_slashes_value%/}
done
printf '%s\n' ${_strip_trailing_slashes_value}
}

Later:

VAR=$(strip_trailing_slashes $VAR)

(Or, alternatively, repeat the loop each time, you're using M4
anyway, so you could AC_DEFUN the whole thing.)

It's up to you to decide what you find more appealing.

Christian
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-30 Thread Christian Seiler 
On 05/30/2015 10:28 AM, Daniel Mack wrote:
 On 05/30/2015 08:50 AM, Mike Gilbert wrote:
 On Fri, May 29, 2015 at 8:05 PM, Daniel Mack dan...@zonque.org wrote:
 Make sure the variable set via --with-rootprefix= does not contain a
 trailing slash, so man pages can use entities like rootprefix;/lib
 without ending up having double slashes.
 ---
  configure.ac | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

 diff --git a/configure.ac b/configure.ac
 index 92654a6..55b73de 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -1396,7 +1396,8 @@ AC_ARG_WITH([zshcompletiondir],

  AC_ARG_WITH([rootprefix],
  AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix 
 for config files and kernel modules]),
 -[], [with_rootprefix=${ac_default_prefix}])
 +[with_rootprefix=`echo ${withval} | sed -e s,/*$,,`],
 +[with_rootprefix=${ac_default_prefix}])

 Why do you pipe it through sed when a simple shell parameter expansion would 
 do?

 with_rootprefix=${withval%/}
 
 Isn't that's a bash'ism which we try to avoid at other places? FWIW, we
 use sed to strip off trailing dashes from $host for EFI_ARCH. Also, that
 one only replaces one trailing slash, not all of them.

No, it's not a bashism, it's indeed POSIX. See:
http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02

For example:

V=aXbXc
printf '%s\n' ${V#*X}
printf '%s\n' ${V##*X}
printf '%s\n' ${V%X*}
printf '%s\n' ${V%%X*}

When using either one of bash, dash, ash, busybox's shell, mksh, pdksh
and zsh as /bin/sh, it all produces the same output:

bXc
c
aXb
a

The following are bashisms, however:

 - ${variable/pattern/subst}
 - ${!variable_variable}

Speaking of: using 'echo' for shell scripting is problematic, because
while bash, busybox's sh, mksh, pdksh and zsh don't interpret escape
sequences (\n, \0oo, ...) by default when using echo and invoked as
/bin/sh, dash and ash do. (Note that e.g. dash ist default on Debian,
so it's not like this is something theoretical.) Also, when invoked as
their proper name (not as /bin/sh), only bash and busybox's shell do
not interpret escape sequences by default with echo. (In short: it's a
mess.)

POSIX itself is ambivalent:

http://pubs.opengroup.org/onlinepubs/009695399/utilities/echo.html
| or if any of the operands contain a backslash ( '\' ) character, the
| results are implementation-defined.

But it does recommend the behavior that ash and dash currently show
and NOT bash's behavior:

| The following character sequences shall be recognized on
| XSI-conformant systems within any of the arguments:
| [ list of escape sequences ]

The only portable way (not only to other UNIX systems, but also to
Linux systems with other shells) of printing things without
interpreting escape sequences is to use printf:

printf '%s\n' $variable

This is the same as ALL POSIX-compliant shells.

See also:
http://unix.stackexchange.com/questions/65803/why-is-printf-better-than-echo

Christian
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Michael Biebl 
2015-05-30 2:24 GMT+02:00 Daniel Mack dan...@zonque.org:

 Fine for me, just go ahead if you have an implementation in mind :)

I was lazy and just copied
ftp://ftp.tu-clausthal.de/pub/mirror/gnu/www/software/ac-archive/normpath.html
The resulting diff would look something like

diff --git a/configure.ac b/configure.ac
index 92654a6..815c8af 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1397,11 +1397,13 @@ AC_ARG_WITH([zshcompletiondir],
 AC_ARG_WITH([rootprefix],
 AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory
prefix for config files and kernel modules]),
 [], [with_rootprefix=${ac_default_prefix}])
+adl_NORMALIZE_PATH([with_rootprefix])

 AC_ARG_WITH([rootlibdir],
 AS_HELP_STRING([--with-rootlibdir=DIR], [Root directory for
libraries necessary for boot]),
 [],
 [with_rootlibdir=${libdir}])
+adl_NORMALIZE_PATH([with_rootlibdir])

 AC_ARG_WITH([pamlibdir],
 AS_HELP_STRING([--with-pamlibdir=DIR], [Directory for PAM modules]),
diff --git a/m4/normpath.m4 b/m4/normpath.m4
new file mode 100644
index 000..5b29488
--- /dev/null
+++ b/m4/normpath.m4
@@ -0,0 +1,15 @@
+AC_DEFUN([adl_NORMALIZE_PATH],
+[case :[$]$1: in
+# change empty paths to '.'
+  ::) $1='.' ;;
+# strip trailing slashes
+  :*[[\\/]]:) $1=`echo [$]$1 | sed 's,[[\\/]]*[$],,'` ;;
+  :*:) ;;
+esac
+# squeze repeated slashes
+case ifelse($2,,[$]$1,$2) in
+# if the path contains any backslashes, turn slashes into backslashes
+ *\\*) $1=`echo [$]$1 | sed 's,\(.\)[[\\/]][[\\/]]*,\1,g'` ;;
+# if the path contains slashes, also turn backslashes into slashes
+ *) $1=`echo [$]$1 | sed 's,\(.\)[[\\/]][[\\/]]*,\1/,g'` ;;
+esac])


This would need to be extended all remaining dirs.

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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Filipe Brandenburger 
On Fri, May 29, 2015 at 5:21 PM, Michael Biebl mbi...@gmail.com wrote:
 autoconf already strips trailing slashes for all default directory
 variables [1].

How does it handle --prefix=/ though? Does it turn it into an empty string?

 I think we should do the same for *all* our custom --with-$foo-dir
 variables, not just rootlibdir.

Agreed.

I think we can go ahead with patch #2 (man: replace hard-coded
/usr/lib) since it works for both the --with-rootprefix=/usr
(default) case and the --with-rootprefix= (empty) case used by Debian.

Cheers,
Filipe
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Michael Biebl 
2015-05-30 2:53 GMT+02:00 Michael Biebl mbi...@gmail.com:
 2015-05-30 2:50 GMT+02:00 Michael Biebl mbi...@gmail.com:
 2015-05-30 2:24 GMT+02:00 Daniel Mack dan...@zonque.org:

 Fine for me, just go ahead if you have an implementation in mind :)

 I was lazy and just copied
 ftp://ftp.tu-clausthal.de/pub/mirror/gnu/www/software/ac-archive/normpath.html

 Oh, I just noticed there is a sort-of official macro for that, already
 provided in Debian as
 /usr/share/aclocal/ax_normalize_path.m4

 It's shipped as part of autoconf-archive.

I we assume, autconf-archive is installed, the resulting patch would
look like the attached diff.
For convenience sake, we could also ship a copy of
/usr/share/aclocal/ax_normalize_path.m4 in our m4/ directory.

Michael
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diff --git a/configure.ac b/configure.ac
index 92654a6..78d52e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1370,16 +1370,19 @@ AC_ARG_WITH([dbuspolicydir],
 AS_HELP_STRING([--with-dbuspolicydir=DIR], [D-Bus policy directory]),
 [],
 [with_dbuspolicydir=${sysconfdir}/dbus-1/system.d])
+AX_NORMALIZE_PATH([with_dbuspolicydir])
 
 AC_ARG_WITH([dbussessionservicedir],
 AS_HELP_STRING([--with-dbussessionservicedir=DIR], [D-Bus session 
service directory]),
 [],
 [with_dbussessionservicedir=${datadir}/dbus-1/services])
+AX_NORMALIZE_PATH([with_dbussessionservicedir])
 
 AC_ARG_WITH([dbussystemservicedir],
 AS_HELP_STRING([--with-dbussystemservicedir=DIR], [D-Bus system 
service directory]),
 [],
 [with_dbussystemservicedir=${datadir}/dbus-1/system-services])
+AX_NORMALIZE_PATH([with_dbussystemservicedir])
 
 AC_ARG_WITH([bashcompletiondir],
 AS_HELP_STRING([--with-bashcompletiondir=DIR], [Bash completions 
directory]),
@@ -1389,29 +1392,35 @@ AC_ARG_WITH([bashcompletiondir],
 ] , [
 with_bashcompletiondir=${datadir}/bash-completion/completions
 ])])
+AX_NORMALIZE_PATH([with_bashcompletiondir])
 
 AC_ARG_WITH([zshcompletiondir],
 AS_HELP_STRING([--with-zshcompletiondir=DIR], [Zsh completions 
directory]),
 [], [with_zshcompletiondir=${datadir}/zsh/site-functions])
+AX_NORMALIZE_PATH([with_zshcompletiondir])
 
 AC_ARG_WITH([rootprefix],
 AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix for 
config files and kernel modules]),
 [], [with_rootprefix=${ac_default_prefix}])
+AX_NORMALIZE_PATH([with_rootprefix])
 
 AC_ARG_WITH([rootlibdir],
 AS_HELP_STRING([--with-rootlibdir=DIR], [Root directory for libraries 
necessary for boot]),
 [],
 [with_rootlibdir=${libdir}])
+AX_NORMALIZE_PATH([with_rootlibdir])
 
 AC_ARG_WITH([pamlibdir],
 AS_HELP_STRING([--with-pamlibdir=DIR], [Directory for PAM modules]),
 [],
 [with_pamlibdir=${with_rootlibdir}/security])
+AX_NORMALIZE_PATH([with_pamlibdir])
 
 AC_ARG_WITH([pamconfdir],
 AS_HELP_STRING([--with-pamconfdir=DIR], [Directory for PAM 
configuration]),
 [],
 [with_pamconfdir=${sysconfdir}/pam.d])
+AX_NORMALIZE_PATH([with_pamconfdir])
 
 AC_ARG_ENABLE([split-usr],
 AS_HELP_STRING([--enable-split-usr], [Assume that /bin, /sbin aren\'t 
symlinks into /usr]),
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Michael Biebl 
2015-05-30 2:05 GMT+02:00 Daniel Mack dan...@zonque.org:
 Make sure the variable set via --with-rootprefix= does not contain a
 trailing slash, so man pages can use entities like rootprefix;/lib
 without ending up having double slashes.
 ---
  configure.ac | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

 diff --git a/configure.ac b/configure.ac
 index 92654a6..55b73de 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -1396,7 +1396,8 @@ AC_ARG_WITH([zshcompletiondir],

  AC_ARG_WITH([rootprefix],
  AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix for 
 config files and kernel modules]),
 -[], [with_rootprefix=${ac_default_prefix}])
 +[with_rootprefix=`echo ${withval} | sed -e s,/*$,,`],
 +[with_rootprefix=${ac_default_prefix}])

  AC_ARG_WITH([rootlibdir],
  AS_HELP_STRING([--with-rootlibdir=DIR], [Root directory for 
 libraries necessary for boot]),

autoconf already strips trailing slashes for all default directory
variables [1].
I think we should do the same for *all* our custom --with-$foo-dir
variables, not just rootlibdir.

Maybe provide a custom macro for that and apply that to

  --with-html-dir=PATHpath to installed docs
  --with-efi-libdir=PATH  Path to EFI lib directory
  --with-efi-ldsdir=PATH  Path to EFI lds directory
  --with-efi-includedir=PATH
  --with-dbuspolicydir=DIR
  --with-dbussessionservicedir=DIR
  --with-dbussystemservicedir=DIR
  --with-bashcompletiondir=DIR
  --with-zshcompletiondir=DIR
  --with-rootprefix=DIR   rootfs directory prefix for config files and kernel
  --with-rootlibdir=DIR   Root directory for libraries necessary for boot
  --with-pamlibdir=DIRDirectory for PAM modules
  --with-pamconfdir=DIR   Directory for PAM configuration

WDYT?

[1] http://comments.gmane.org/gmane.comp.sysutils.autoconf.bugs/5747
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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Michael Biebl 
2015-05-30 2:50 GMT+02:00 Michael Biebl mbi...@gmail.com:
 2015-05-30 2:24 GMT+02:00 Daniel Mack dan...@zonque.org:

 Fine for me, just go ahead if you have an implementation in mind :)

 I was lazy and just copied
 ftp://ftp.tu-clausthal.de/pub/mirror/gnu/www/software/ac-archive/normpath.html

Oh, I just noticed there is a sort-of official macro for that, already
provided in Debian as
/usr/share/aclocal/ax_normalize_path.m4

It's shipped as part of autoconf-archive.

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[systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Daniel Mack 
Make sure the variable set via --with-rootprefix= does not contain a
trailing slash, so man pages can use entities like rootprefix;/lib
without ending up having double slashes.
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 92654a6..55b73de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1396,7 +1396,8 @@ AC_ARG_WITH([zshcompletiondir],
 
 AC_ARG_WITH([rootprefix],
 AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix for 
config files and kernel modules]),
-[], [with_rootprefix=${ac_default_prefix}])
+[with_rootprefix=`echo ${withval} | sed -e s,/*$,,`],
+[with_rootprefix=${ac_default_prefix}])
 
 AC_ARG_WITH([rootlibdir],
 AS_HELP_STRING([--with-rootlibdir=DIR], [Root directory for libraries 
necessary for boot]),
-- 
2.4.0

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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Michael Biebl 
2015-05-30 2:30 GMT+02:00 Filipe Brandenburger filbran...@google.com:
 On Fri, May 29, 2015 at 5:21 PM, Michael Biebl mbi...@gmail.com wrote:
 autoconf already strips trailing slashes for all default directory
 variables [1].

 How does it handle --prefix=/ though? Does it turn it into an empty string?

Hm, no, apparently it doesn't. It only strips the trailing '/' when
you use something like --prefix=/usr/


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Re: [systemd-devel] [PATCH 1/2] configure.ac: strip off trailing slashed from $rootprefix

2015-05-29 Thread Daniel Mack 
On 05/30/2015 02:21 AM, Michael Biebl wrote:
 2015-05-30 2:05 GMT+02:00 Daniel Mack dan...@zonque.org:
 Make sure the variable set via --with-rootprefix= does not contain a
 trailing slash, so man pages can use entities like rootprefix;/lib
 without ending up having double slashes.
 ---
  configure.ac | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

 diff --git a/configure.ac b/configure.ac
 index 92654a6..55b73de 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -1396,7 +1396,8 @@ AC_ARG_WITH([zshcompletiondir],

  AC_ARG_WITH([rootprefix],
  AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix 
 for config files and kernel modules]),
 -[], [with_rootprefix=${ac_default_prefix}])
 +[with_rootprefix=`echo ${withval} | sed -e s,/*$,,`],
 +[with_rootprefix=${ac_default_prefix}])

  AC_ARG_WITH([rootlibdir],
  AS_HELP_STRING([--with-rootlibdir=DIR], [Root directory for 
 libraries necessary for boot]),
 
 autoconf already strips trailing slashes for all default directory
 variables [1].
 I think we should do the same for *all* our custom --with-$foo-dir
 variables, not just rootlibdir.
 
 Maybe provide a custom macro for that and apply that to
 
   --with-html-dir=PATHpath to installed docs
   --with-efi-libdir=PATH  Path to EFI lib directory
   --with-efi-ldsdir=PATH  Path to EFI lds directory
   --with-efi-includedir=PATH
   --with-dbuspolicydir=DIR
   --with-dbussessionservicedir=DIR
   --with-dbussystemservicedir=DIR
   --with-bashcompletiondir=DIR
   --with-zshcompletiondir=DIR
   --with-rootprefix=DIR   rootfs directory prefix for config files and kernel
   --with-rootlibdir=DIR   Root directory for libraries necessary for boot
   --with-pamlibdir=DIRDirectory for PAM modules
   --with-pamconfdir=DIR   Directory for PAM configuration
 
 WDYT?

Fine for me, just go ahead if you have an implementation in mind :)


Thanks,
Daniel

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