[devel] lomoco#1.0-alt1
Alexey Tourbin
at на altlinux.ru
Вс Сен 16 20:35:11 MSD 2007
On Sun, Sep 16, 2007 at 07:24:15PM +0300, Michael Shigorin wrote:
> On Sun, Sep 16, 2007 at 08:23:06PM +0400, QA Team Robot wrote:
> > 2 NEW unmet dependencies detected:
> > lomoco#1.0-alt1 /bin/logger
> > lomoco#1.0-alt1 /etc/sysconfig/logitech_mouse
>
> Это уже по симлинкам или я просто хлопнул ушами? :)
> Вроде проверял, не знаю -- забыл пакет залить тогда
> или просто соединение упало...
$ rpmfile lomoco-1.0-alt1.i586.rpm
/etc/udev/rules.d/40-lomoco.rules 100644 ASCII text
/lib/udev/lomoco 100755 Bourne-Again shell script text executable
^^^^^^^^^^^^^^^^ исполняемый шелл-скрипт
/usr/bin/lomoco 100755 ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
/usr/share/doc/lomoco-1.0 40755 directory
/usr/share/doc/lomoco-1.0/AUTHORS 100644 ASCII text
/usr/share/doc/lomoco-1.0/ChangeLog 100644 ASCII English text
/usr/share/doc/lomoco-1.0/NEWS 100644 empty
/usr/share/doc/lomoco-1.0/README 100644 ASCII English text
/usr/share/man/man1/lomoco.1.gz 100644 gzip compressed data, from Unix, max compression
$ rpmpeek lomoco-1.0-alt1.i586.rpm grep -rw logger .
./lib/udev/lomoco:esac 2>&1 | /bin/logger -t lomoco
$ rpmpeek lomoco-1.0-alt1.i586.rpm grep -rw logitech_mouse .
./lib/udev/lomoco: . /etc/sysconfig/logitech_mouse
$
Проблемы, которые проявляются при поиске зависимостей через симлинки
(в новом rpm-build), на самом деле не являются специфическими для
симлинков. Похожие "проблемы" могут возникать и со "старым" rpm-build.
Ровно это я написал в коммите к symlinks.req, и в общем-то это отчасти
убедило меня в том, что сама идея symlinks.req в целом правильная.
См. мой rpm.git 9693c85f5291d527db6828f29221324028f05aa8
Ладно, вот он весь этот опус.
commit 9693c85f5291d527db6828f29221324028f05aa8
Author: Alexey Tourbin <at на altlinux>
Date: Fri Mar 9 21:11:03 2007 +0300
implemented symlinks.req
Consider R-devel package, which has its own private bin/ directory,
where it keeps certain scripts.
$ rpm -ql R-devel |grep libtool
/usr/lib/R/bin/libtool
$ rpm -ql R-devel |grep texi2dvi
/usr/lib/R/bin/texi2dvi
$
I replace some scripts, such as libtool, with wrappers:
$ tail -1 /usr/lib/R/bin/libtool
exec /usr/bin/libtool "$@"
$
R-devel now has a libtool dependency, generated by shell.req:
$ rpm -qR R-devel |grep libtool
libtool-common
$ rpm -qf /usr/bin/libtool
libtool-common-0.2-alt1
$
However, I want the very same dependency SIMPLY BY PLACING SYMBOLIC LINK
to /usr/bin/libtool. My new script symlinks.req implements this idea.
It works as follows:
1) We check all absolute symbolic links, e.g. -> /usr/bin/libtool.
If symbolic link is absolute, we fetch its value and feed to FindPackage.
Note that FindPackage will first check whether e.g. /usr/bin/libtool is
available under RPM_BUILD_ROOT.
2) We also check all broken symbolic links, e.g. -> ../../../bin/libtool.
The fact that symbolic link is broken means that it cannot be resolved into
buildroot and otherwise must be resolved in the host system after the package
is installed, which is the dependency on where it would point to after install.
This means we must canonicalize the link value, strip RPM_BUILD_ROOT,
and then call FindPackage. Here is what happens:
$ cd `mktemp -d`
$ RPM_BUILD_ROOT=$PWD
$ mkdir -p ./usr/lib/R/bin/
$ ln -s `relative /usr/bin/libtool /usr/lib/R/bin/libtool` $RPM_BUILD_ROOT/usr/lib/R/bin/libtool
$ l $RPM_BUILD_ROOT/usr/lib/R/bin/libtool
lrwxrwxrwx 1 at at 20 Mar 9 22:14 /tmp/.private/at/tmp.AHnBX26473/usr/lib/R/bin/libtool -> ../../../bin/libtool
$ [ -e $RPM_BUILD_ROOT/usr/lib/R/bin/libtool ] || echo broken
broken
$ readlink -vm $RPM_BUILD_ROOT/usr/lib/R/bin/libtool
/tmp/.private/at/tmp.AHnBX26473/usr/bin/libtool
$ to=`!!`; echo ${to#$RPM_BUILD_ROOT}
/usr/bin/libtool
$
And then FindPackage is called with "/usr/bin/libtool".
Now note that if FindPackage is not able to associate e.g. /usr/bin/libtool
with any particular rpm package, it will just place raw dependency on
/usr/bin/libtool. So, this new type of dependencies is a bit dangerous:
basically for each really broken symbolic link there will be an unmet
dependency. On the other hand, this can be viewed as a means of protection
from packages with really broken symbolic links.
If you are frightened with this brand new and dangerous type of dependencies,
please also note that this new type of dependencies is not much more dangerous
than absolute paths to executables in plain shell scripts.
$ /usr/lib/rpm/shell.req -v /dev/stdin <<</i/am/unmet
error: file /i/am/unmet: No such file or directory
shell.req: /dev/stdin: /i/am/unmet -> /i/am/unmet (raw, not found)
/i/am/unmet
$
diff --git a/configure.in b/configure.in
index 1ed61cc..ce8b41b 100644
--- a/configure.in
+++ b/configure.in
@@ -1009,6 +1009,7 @@ AC_OUTPUT([ Doxyfile Makefile rpmrc macros platform rpmpopt rpm.spec
scripts/shell.req
scripts/static.req
scripts/strip_files
+ scripts/symlinks.req
scripts/verify-elf
tests/Makefile tests/rpmrc tests/macros tests/hello-test/Makefile
po/Makefile.in
diff --git a/rpm-4_0.spec b/rpm-4_0.spec
index 7fb8cde..38232be 100644
--- a/rpm-4_0.spec
+++ b/rpm-4_0.spec
@@ -476,6 +476,7 @@ fi
%rpmattr %_rpmlibdir/shell.*
%rpmattr %_rpmlibdir/shebang.*
%rpmattr %_rpmlibdir/static.*
+%rpmattr %_rpmlibdir/symlinks.*
%rpmattr %_rpmlibdir/verify-elf
%rpmattr %_rpmlibdir/Specfile.pm
%rpmattr %_rpmlibdir/*.awk
diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 0045d99..1e1e27c 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -20,6 +20,7 @@ EXTRA_DIST = \
shell.req shell.req.files shell.prov shell.prov.files \
sql.prov sql.req strip_files \
static.req static.req.files \
+ symlinks.req symlinks.req.files \
tcl.req trpm u_pkg.sh verify-elf vpkg-provides.sh vpkg-provides2.sh
installprefix = $(DESTDIR)
@@ -45,4 +46,5 @@ config_SCRIPTS = \
shell.req shell.req.files shell.prov shell.prov.files \
sql.prov sql.req strip_files \
static.req static.req.files \
+ symlinks.req symlinks.req.files \
tcl.req trpm u_pkg.sh verify-elf vpkg-provides.sh vpkg-provides2.sh
diff --git a/scripts/symlinks.req.files b/scripts/symlinks.req.files
new file mode 100755
index 0000000..84167a8
--- /dev/null
+++ b/scripts/symlinks.req.files
@@ -0,0 +1,9 @@
+#!/bin/sh -efu
+while IFS=$'\t' read -r f t; do
+ case "$t" in
+ *'symbolic link to `/'*)
+ echo "$f"; continue ;;
+ *'broken symbolic link to '*)
+ echo "$f"; continue ;;
+ esac
+done
diff --git a/scripts/symlinks.req.in b/scripts/symlinks.req.in
new file mode 100644
index 0000000..03dfcc8
--- /dev/null
+++ b/scripts/symlinks.req.in
@@ -0,0 +1,22 @@
+#!/bin/sh -efu
+
+. @RPMCONFIGDIR@/functions
+. @RPMCONFIGDIR@/find-package
+[ -n "${RPM_BUILD_ROOT-}" ] || Fatal "I do need RPM_BUILD_ROOT"
+real_buildroot=$(cd "$RPM_BUILD_ROOT" && /bin/pwd) || exit 1
+
+SymlinkReq()
+{
+ local f="$1"; shift
+ [ -L "$f" ] || return 0
+ local to=; to=$(readlink -v "$f")
+ if [ -n "$to" -a -z "${to##/*}" ]; then
+ FindPackage "$f" "$to"
+ elif ! [ -e "$f" ]; then
+ to=$(readlink -vm "$f")
+ to=${to#$real_buildroot}
+ FindPackage "$f" "$to"
+ fi
+}
+
+ArgvFileAction SymlinkReq "$@"
----------- следующая часть -----------
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