Control: reopen -1 Control: found -1 1.09 Control: retitle -1 dlocate: -lsbin doesn't work when awk is mawk, missing package relation with gawk Control: tag -1 + patch
Dear Craig,
Debian Bug Tracking System wrote:
> * Closes: #903773 Can not reproduce
A bug which you can't reproduce has no business to get closed in a
debian/changelog entry!
Please tag such bug reports as "unreproducible" and ask the bug report
for more details (and maybe tag it with "moreinfo" as well).
I still can reproduce this issue — at least on one machine. And I
can't reproduce it on another (and probably never could there). And I
now figured out what's the difference between those two machines:
As you might know, there are two awk implementations in Debian: mawk
and gawk. By default only mawk is installed (and is always there due
to "Priority: required") while gawk is optional (but IIRC default if
installed).
On the system where "dlocate -lsbin" works, the symlinks look like this:
lrwxrwxrwx 1 root root 21 […] /usr/bin/awk -> /etc/alternatives/awk*
lrwxrwxrwx 1 root root 13 […] /etc/alternatives/awk -> /usr/bin/gawk*
On the system where "dlocate -lsbin" gives no output, the symlinks
look like this:
lrwxrwxrwx 1 root root 21 […] /usr/bin/awk -> /etc/alternatives/awk*
lrwxrwxrwx 1 root root 13 […] /etc/alternatives/awk -> /usr/bin/mawk*
Culprit is this call:
awk '!/^[^-]/ && /^-.{2,8}[xs]/ {print $2}'
mawk doesn't know about {x,y} quantifiers in regular expressions, and
since there is never a { at the second column in the output… Proof:
$ dlocate -L zsh | xargs -d '\n' -r stat -c '%A %n' | gawk '!/^[^-]/ &&
/^-.{2,8}[xs]/ {print $2}'
/bin/zsh
/bin/zsh5
/usr/share/bug/zsh
$ dlocate -L zsh | xargs -d '\n' -r stat -c '%A %n' | mawk '!/^[^-]/ &&
/^-.{2,8}[xs]/ {print $2}'
$
So "dlocate -lsbin" doesn't work with Debian's default awk
installation. (And btw. the "!/^[^-]/" is redundant as "/^-…/" is
equivalent.)
So I recommend to replace this gawk-ism with the following much
simpler and POSIX compatible pattern and match it only against the
first column so the quantifiers are no more needed:
$1 ~ /^-.*[xs]/
Proof:
$ dlocate -L zsh | xargs -d '\n' -r stat -c '%A %n' | gawk '$1 ~ /^-.*[xs]/
{print $2}'
/bin/zsh
/bin/zsh5
/usr/share/bug/zsh
$ dlocate -L zsh | xargs -d '\n' -r stat -c '%A %n' | mawk '$1 ~ /^-.*[xs]/
{print $2}'
/bin/zsh
/bin/zsh5
/usr/share/bug/zsh
This is IMHO the better and cleaner alternative to adding a Depends or
at least Recommends on gawk which — with the current code base — is
clearly missing.
Regards, Axel
--
,''`. | Axel Beckert <a...@debian.org>, https://people.debian.org/~abe/
: :' : | Debian Developer, ftp.ch.debian.org Admin
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