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authorMike Frysinger <vapier@gentoo.org>2008-01-05 07:06:08 +0000
committerMike Frysinger <vapier@gentoo.org>2008-01-05 07:06:08 +0000
commit3ea0aa46f70e85a7cd97b278831b73ec46cb71f6 (patch)
treedfa33056c953a912124e06a85ca83e61a00f0a91
parentee438a1eb65d4092116df23ce029fa98bc5ea162 (diff)
zen in #938 writes:
I had occasion to look at the uClibc script "getent" and felt compelled to clean out the cargo-cult programming style. I believe that this version is clearer, and I've added some minor features while I was in there: * usage clause, if no arguments or "--help" requested * original version appears to have been intending to "exit 2" on failure to match, but didn't * basic, probably good enough, support for ethers and netgroups * faster ;-) [as if that matters for this script]
-rwxr-xr-xextra/scripts/getent92
1 files changed, 31 insertions, 61 deletions
diff --git a/extra/scripts/getent b/extra/scripts/getent
index 03b5f28a9..30d515b7e 100755
--- a/extra/scripts/getent
+++ b/extra/scripts/getent
@@ -1,73 +1,43 @@
#!/bin/sh
+# $Header: /var/cvs/uClibc/extra/scripts/getent,v 1.2 2005/02/02 14:18:01 solar Exp $
#
-# Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+# Closely (not perfectly) emulate the behavior of glibc's getent utility
#
-# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
-#
-
-# Script to replicate the `getent` binary that comes with glibc
+#passwd|shadow|group|aliases|hosts|networks|ethers|netgroup|protocols|services|rpc
+# only returns the first match (by design)
+# dns based search is not supported (hosts,networks)
+# case-insensitive matches not supported (ethers; others?)
+# may return false-positives (hosts,protocols,rpc,services,ethers)
-search_entry() {
- if [ -e "$1" ] ; then
- /bin/egrep -v "^#" $1 | /bin/sed 's/#.*$//' | /bin/egrep "${string}" | /bin/sed -n 1p
- retval=$?
- [ "$retval" = 0 ] || retval=2
- else
- retval=2
- fi
-}
-
-if [ -z "$1" ] ; then
- echo "getent: wrong number of arguments" 1>&2
- exit 1
-fi
+export PATH="${PATH}:/bin:/usr/bin"
file="/etc/$1"
-string="dummy"
+case $1 in
+ passwd|group)
+ match="^$2:\|^[^:]*:[^:]*:$2:" ;;
+ shadow)
+ match="^$2:" ;;
+ networks|netgroup)
+ match="^[[:space:]]*$2\>" ;;
+ hosts|protocols|rpc|services|ethers)
+ match="\<$2\>" ;;
+ aliases)
+ match="^[[:space:]]*$2[[:space:]]*:" ;;
+ ""|-h|--help)
+ echo "USAGE: $0 database [key]"
+ exit 0 ;;
+ *)
+ echo "$0: Unknown database: $1" 1>&2
+ exit 1 ;;
+esac
if [ ! -f "$file" ] ; then
- echo "Unknown database: $1" 1>&2
- exit 1
+ echo "$0: Could not find database file for $1" 1>&2
+ exit 1
fi
-#aliases|ethers|group|hosts|netgroup|networks|passwd|protocols|rpc|services|shadow)
-# dns based search is not supported for hosts|networks
-# ethers|netgroup (not done, needed)?
-# it returns only the first match
-case $1 in
- passwd)
- string="(^\<$2\>:|^.*:.*:\<$2\>:.*:.*:.*:.*)"
- ;;
- group)
- string="(^|:)\<$2\>:"
- ;;
- shadow)
- string="^\<$2\>:"
- ;;
- aliases)
- if [ -f /etc/postfix/aliases ] ; then
- file="/etc/postfix/aliases"
- elif [ -f /etc/mail/aliases ] ; then
- file="/etc/mail/aliases"
- fi
- string="^\<$2\>:"
- ;;
- networks)
- string="^\<$2\>"
- ;;
- hosts|protocols|rpc|services)
- string="\<$2\>"
- ;;
- *)
- echo "Unknown database: $1"
- exit 1
- ;;
-esac
-
-if [ -z "$2" ] ; then
- exec cat $file
+if [ $# -eq 1 ] ; then
+ exec cat "$file"
else
- search_entry "$file" "$2"
+ sed "s/#.*//; /$match/q; d" "$file" | grep . || exit 2
fi
-
-exit $retval