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'pkg-config --libs' seems to deploy dependencies recursively,
which is what I did not expect.
$ grep Requires pango.pc
Requires: glib-2.0,gobject-2.0,gmodule-no-export-2.0
$ grep Lib pango.pc
Libs: -lpango-1.0 -lm
$ pkg-config --libs-only-l pango.pc
-lpango-1.0 -lm -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0
$
I need some time to devise a better implementation.
This is to address a few problems:
1) When checking RPM_BUILD_ROOT, st_mode test performed by /usr/bin/which
is not quite reliable. Files can be packaged with different %attr mode.
2) When checking RPM_BUILD_ROOT, there could be symbolic links there
which are (not-so-) broken.
3) When checking host system, files like /sbin/init (which is 0700)
are effectively bypassed by /usr/bin/which.
4) There's an ongoing practice of placing shell function libraries
under /usr/bin, e.g. /usr/bin/git-sh-setup. These files are sourced
from within shell scripts and need not be executable at all.
This leads me to the point that permission check, which is performed by
/usr/bin/which, is not needed at all. Note that things are getting more like
contents_index_bin search. And for RPM_BUILD_ROOT, we do not even require
strong stat-wise file existence.
I like this new term: "strong stat-wise file existence".
It's awesome.
There are two possibilities for protection:
1) we should protect at least from very evil shell metacharacters,
like [$*], and also from [:cntrl:] (e.g. newline).
2) we can provide an exhaustive list of characters that are valid
for non-evil pathnames and commands, and issue mandatory warning
if the command or path appears to be evil.
I chose the latter approach.
Valid character range is 'A-Za-z0-9/@=.,:_+-'.
Note that (almost) all files from our base build system
are valid paths:
$ valid='A-Za-z0-9/@=.,:_+-'
$ hsh-run -- rpm -qal |grep "[^$valid]"
/usr/bin/[
/usr/share/man/man1/[.1.bz2
(contains no files)
(contains no files)
$
Later we'll see if the range of valid characters needs to be extended.
(old)
$ /usr/lib/rpm/pkgconfig.req /usr/lib/pkgconfig/gtkextra-2.0.pc
Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'gtk+-2.0', required by 'GtkExtra', not found
$
(new)
$ scripts/pkgconfig.req.in /usr/lib/pkgconfig/gtkextra-2.0.pc
Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'gtk+-2.0', required by 'GtkExtra', not found
pkgconfig.req.in: failed to process /usr/lib/pkgconfig/gtkextra-2.0.pc
$
$ ls /usr/lib/pkgconfig/*.pc >.1
$ ls /usr/lib/pkgconfig/*.pc |file -NF$'\t' -f - |./scripts/pkgconfig.req.files >.2
pkgconfig.req.files: /usr/lib/pkgconfig/libpng.pc: symbolic link to `libpng12.pc'
$ diff -U1 .1 .2
--- .1 2007-08-28 18:26:10 +0400
+++ .2 2007-08-28 18:26:13 +0400
@@ -115,3 +115,2 @@
/usr/lib/pkgconfig/libpcre.pc
-/usr/lib/pkgconfig/libpng.pc
/usr/lib/pkgconfig/libpng12.pc
$
Remember that symlinks are relevant only for find-requires.
There is no such thing as symbolic links in find-provides.
I see that this can add SOME problems if e.g. /usr is relocated
to /storage/usr in the build environment. This is because CanonPath
follows symlinks for dirname.
But I argue that it is safe for hasher, and it fixes some problems
with contents_index search which is used only in the hasher (by default).
I also argue that, even if /usr is relocated, this is not going to be a BIG
problem, because it is not going to produce unmet dependencies (well, most
of the time). This is because 'rpm -qf' will work as expected in that screwed
build environment.
This is actually a DWIM-style hack. It does what we want but I cannot
think of a better name. The idea is that sometimes we want to clean
up path name, possibly following symbolic links, except for the last
component, which we want to keep as is.
$ sh -c '. scripts/functions; CanonPath /etc/init.d/functions'
/etc/rc.d/init.d/functions
$ sh -c '. scripts/functions; CanonPath /usr/bin/../bin/perl'
/usr/bin/perl
$
So actually it does a few different things: 1) prepend $PWD if needed;
2) cleanup dirname; 3) canonicalize dirname with respect to symbolic links.
Now the question is how to process symbolic links which
targets are directories, e.g. /etc/init.d ? My answer is that
both "/etc/init.d" and "/etc/init.d/", as well as "/etc/init.d/."
should yield the same result, which is "/etc/rc.d/init.d".
