Learn BashScript from Daniel Robbins ／*003*／

ABSTRACT：

　　Daniel Robbins is best known as the creator of Gentoo Linux and author of many IBM developerWorks articles about Linux. Daniel currently serves as Benevolent Dictator for Life (BDFL) of Funtoo Linux. Funtoo Linux is a Gentoo-based distribution and continuation of Daniel‘s original Gentoo vision.

Operation logic of the original version of Portage(a package manager used by Gentoo,Funtoo,etc.)

1 # /etc/ebuild.conf:set system-wide ebuild options in this file
2 # MAKEOPTS are options passed to make
3 MAKEOPTS="-j2" 

package.ebuild:

1 #this ebuild file overrides the default user_compile()
2 P=e2fsprogs-1.18
3 A=${P}.tar.gz
4 user_compile() {
5 　　./configure --enable-elf-shlibs
6 make
7 }　　#e2fsprogs.ebuild

ebuild:

 1 #!/usr/bin/env bash
 2 if [ $# -ne 2 ]
 3 then
 4 　　echo "Please specify ebuild file and unpack, compile or all"
 5 exit 1
 6 fi
 7 source /etc/ebuild.conf
 8 if [ -z "$DISTDIR" ]
 9 then
10 # set DISTDIR to /usr/src/distfiles if not already set
11 　　DISTDIR=/usr/src/distfiles
12 fi
13 export DISTDIR
14 ebuild_unpack() {
15 　　#make sure we‘re in the right directory
16 　　cd ${ORIGDIR}
17 if [ -d ${WORKDIR} ]
18 then
19 　　rm -rf ${WORKDIR}
20 fi
21 mkdir ${WORKDIR}
22 cd ${WORKDIR}
23 if [ ! -e ${DISTDIR}/${A} ]
24 then
25 　　echo "${DISTDIR}/${A} does not exist. Please download first."
26 exit 1
27 fi
28 tar xzf ${DISTDIR}/${A}
29 echo "Unpacked ${DISTDIR}/${A}."
30 #source is now correctly unpacked
31 }
32 user_compile()
33 {
34 #we‘re already in ${SRCDIR}
35 if [ -e configure ]
36 then
37 #run configure script if it exists
38 　　./configure --prefix=/usr
39 fi
40 　　#run make
41 　　make $MAKEOPTS MAKE="make $MAKEOPTS"
42 }
43 ebuild_compile() {
44 if [ ! -d "${SRCDIR}" ]
45 then
46 　　echo "${SRCDIR} does not exist -- please unpack first."
47 exit 1
48 fi
49 #make sure we‘re in the right directory
50 cd ${SRCDIR}
51 user_compile
52 }
53 export ORIGDIR=`pwd`
54 export WORKDIR=${ORIGDIR}/work
55 if [ -e "$1" ]
56 then
57 　　source $1
58 else
59 　　echo "Ebuild file $1 not found."
60 exit 1
61 fi
62 export SRCDIR=${WORKDIR}/${P}
63 case "${2}" in
64 　　unpack)
65 　　　　ebuild_unpack ;;
66 　　compile)
67 　　　　ebuild_compile ;;
68 　　all)
69 　　　　ebuild_unpack ebuild_compile ;;
70 　　*)
71 　　　　echo "Please specify unpack, compile or all as the second arg"
72 　　　　exit 1 ;;
73 esac

REFERENCES:

• http://www.funtoo.org/Bash_by_Example,_Part_1
• http://www.funtoo.org/Bash_by_Example,_Part_2
• http://www.funtoo.org/Bash_by_Example,_Part_3
• http://www.jb51.net/article/51342.htm