2939976 [rkeene@sledge /home/rkeene/tmp]$ cat -n fakeroot.sh
  1 #! /bin/bash
  2 
  3 # Print usage information
  4 function print_help() {
  5     echo "Usage: fakeroot [-m <size>] [-c <cpiopath>] [-C <cpiofile>] [-T <tmpfile>] [-hrz] [--] <command>..."
  6 }
  7 
  8 # Parse arguments
  9 mem='512M'
 10 cpiodir=''
 11 cpiofile='out.cpio'
 12 tmpfile=''
 13 add_args=''
 14 gzip_cpio='0'
 15 readonly='0'
 16 while getopts 'm:c:C:T:hrz' var; do
 17     case "${var}" in
 18         m)
 19             mem="${OPTARG}"
 20             ;;
 21         c)
 22             cpiodir="${OPTARG}"
 23             ;;
 24         C)
 25             cpiofile="${OPTARG}"
 26             ;;
 27         T)
 28             tmpfile="${OPTARG}"
 29             ;;
 30         z)
 31             gzip_cpio='1'
 32             ;;
 33         r)
 34             readonly='1'
 35             ;;
 36         h)
 37             print_help
 38 
 39             exit 0
 40             ;;
 41         *)
 42             print_help >&2
 43 
 44             exit 1
 45             ;;
 46     esac
 47 done
 48 shift $[${OPTIND} - 1]
 49 
 50 if [ -z "$*" ]; then
 51     echo "Command not specified." >&2
 52 
 53     print_help >&2
 54 
 55     exit 1
 56 fi
 57 
 58 # Locate path to our script
 59 ourdir="$(dirname "$(which "$0")")"
 60 
 61 # Define path to root image
 62 rootfs="${ourdir}/uml_root.img"
 63 
 64 # Build UML root image if needed
 65 if [ ! -e "${rootfs}" ]; then
 66     (
 67         PATH="${PATH}:/usr/sbin:/sbin"
 68         export PATH
 69 
 70         cd "${ourdir}" || exit 1
 71 
 72         rm -rf uml_root.new
 73         mkdir uml_root.new uml_root.new/bin uml_root.new/lib uml_root.new/host uml_root.new/proc uml_root.new/tmp
 74         ln -s . uml_root.new/usr
 75         ln -s lib uml_root.new/lib64
 76         ln -s lib uml_root.new/lib32
 77         ln -s bin uml_root.new/sbin
 78         cp $(which bash mount cp chroot) uml_root.new/bin
 79         cp bin/uml_root_init uml_root.new/init
 80         echo -ne '#include <unistd.h>\n#include <sys/reboot.h>\nint main(int argc, char **argv) { sync();
	return(reboot(RB_HALT_SYSTEM)); }' | gcc -Wall -x c -o uml_root.new/bin/halt -
 81         ./bin/copy-bin-libs uml_root.new/bin uml_root.new/lib
 82         rm -rf uml_root
 83         mv uml_root.new uml_root
 84 
 85         rm -f uml_root.img.new
 86         ( cd uml_root && find | cpio -o -H newc ) | gzip -9c > uml_root.img.new
 87         mv uml_root.img.new uml_root.img
 88 
 89         rm -rf uml_root
 90     )
 91 fi
 92 
 93 # Create UML kernel if needed
 94 if [ ! -e "${ourdir}/linux" ]; then
 95     ${MAKE:-make} -C "${ourdir}" linux
 96 fi
 97 
 98 # Create SLiRP binary, if needed
 99 if [ ! -e "${ourdir}/slirp" ]; then
100     ${MAKE:-make} -C "${ourdir}" slirp
101 fi
102 
103 # Create tmpfile, if requested
104 if [ -n "${tmpfile}" ]; then
105     if [ ! -e "${tmpfile}" ]; then
106         rm -f "${tmpfile}"
107 
108         ## Create 2GB file
109         dd if=/dev/zero of="${tmpfile}" bs=1024 count=1 seek=$[6 * 1024 * 1024 - 1] 2>/dev/null >/dev/null
110 
111         ## Put ext2 filesystem on it
112         (
113             PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
114 
115             mkfs -F -t ext2 "${tmpfile}" >/dev/null 2>/dev/null
116         )
117     fi
118 
119     ## Attach the disk to the UML image
120     add_args="${add_args} ubd1d=$(set | grep '^tmpfile=' | cut -f 2- -d =)"
121 
122     if [ "${readonly}" = '1' ]; then
123         add_args="${add_args} fakeroot_disk_readonly"
124     fi
125 fi
126 
127 marker="::${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}__"
128 script="/tmp/fakeroot-script-${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}"
129 
130 # Create a script to run in the fake root environment
131 echo '#! /bin/bash' > "${script}"
132 export >> "${script}"
133 echo "hostname $(hostname)" >> "${script}"
134 echo "cd $(set | grep '^PWD=' | cut -f 2- -d =)" >> "${script}"
135 cat << \__SCRIPT_EOF__ >> "${script}"
136 PATH="/tmp/fakebin:/sbin:/usr/sbin:/usr/local/sbin:${PATH}"
137 export PATH
138 
139 ifconfig lo 127.0.0.1 netmask 255.0.0.0 broadcast 127.255.255.25
140 ifconfig eth0 10.0.2.14 netmask 255.255.255.240 broadcast 10.0.2.15
141 route add default gw 10.0.2.2
142 
143 __SCRIPT_EOF__
144 
145 cat << __SCRIPT_EOF__ >> "${script}"
146 cat << \_EOF_ > /tmp/hosts
147 10.0.2.14     $(hostname) $(hostname --fqdn)
148 __SCRIPT_EOF__
149 
150 getent hosts | sed 's@$@ @' | grep -v " $(hostname) " >> "${script}"
151 
152 cat << __SCRIPT_EOF__ >> "${script}"
153 _EOF_
154 mount -n --bind /tmp/hosts /etc/hosts
155 __SCRIPT_EOF__
156 
157 echo "echo -n ${marker}" >> "${script}"
158 for arg in "$@"; do
159     echo -n "$(set | grep '^arg=' | cut -f 2- -d =) " >> "${script}"
160 done
161 echo "" >> "${script}"
162 echo 'retval=$?' >> "${script}"
163 echo "echo -n ${marker}" >> "${script}"
164 echo "echo \${retval} > /tmp/root/${script}.retval" >> "${script}"
165 
166 # If a cpio directory was specified, create a cpio file from it
167 if [ -n "${cpiodir}" ]; then
168     echo 'if [ "${retval}" = "0" ]; then' >> "${script}"
169     echo -n "( cd $(set | grep '^cpiodir=' | cut -f 2- -d =) && find . -xdev -print0 | cpio -o -0 -H newc )" >>
	"${script}"
170     if [ "${gzip_cpio}" = '1' ]; then
171         echo -n " | gzip -1c" >> "${script}"
172     fi
173     echo " > $(set | grep '^cpiofile=' | cut -f 2- -d =)" >> "${script}"
174     echo 'fi' >> "${script}"
175 fi
176 
177 chmod 700 "${script}"
178 
179 if ! tty 2>/dev/null >/dev/null; then
180     con="con=null,fd:1"
181 else
182     con="con=fd:0,fd:1"
183 fi
184 
185 # Launch the kernel
186 rm -f "${script}.retval"
187 echo '-1' > "${script}.retval"
188 "${ourdir}/linux" "${con}" ssl=null mem="${mem}" initrd="${rootfs}" eth0=slirp,,"${ourdir}/slirp" quiet hostfs=/
	${add_args} script="/tmp/root${script}" 2>/dev/null | "${ourdir}/bin/line-cut" "${marker}"
189 retval="$(cat "${script}.retval")"
190 
191 # Reset our tty
192 stty echo opost 2>/dev/null
193 
194 # Cleanup
195 rm -f "${script}" "${script}.retval"
196 
197 # Exit with the return value of the script
198 exit "${retval}"
2939977 [rkeene@sledge /home/rkeene/tmp]$

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last modified: 2016-04-20 11:23:20