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1.1 root 1: #! /bin/sh
2: # @(#)util/savelog.sh 1.4 26 Oct 1991 22:49:39
3: #
4: # savelog - save a log file
5: #
6: # Copyright (C) 1987, 1988 Ronald S. Karr and Landon Curt Noll
7: #
8: # See the file COPYING, distributed with smail, for restriction
9: # and warranty information.
10: #
11: # usage: savelog [-m mode] [-u user] [-g group] [-t] [-c cycle] [-l] file...
12: #
13: # -m mode - chmod log files to mode
14: # -u user - chown log files to user
15: # -g group - chgrp log files to group
16: # -c cycle - save cycle versions of the logfile (default: 7)
17: # -t - touch file
18: # -l - don't compress any log files (default: compress)
19: # file - log file names
20: #
21: # The savelog command saves and optionally compresses old copies of files
22: # into an 'dir'/OLD sub-directory. The 'dir' directory is determined from
23: # the directory of each 'file'.
24: #
25: # Older version of 'file' are named:
26: #
27: # OLD/'file'.<number><compress_suffix>
28: #
29: # where <number> is the version number, 0 being the newest. By default,
30: # version numbers > 0 are compressed (unless -l prevents it). The
31: # version number 0 is never compressed on the off chance that a process
32: # still has 'file' opened for I/O.
33: #
34: # If the 'file' does not exist or if it is zero length, no further processing
35: # is performed. However if -t was also given, it will be created.
36: #
37: # For files that do exist and have lengths greater than zero, the following
38: # actions are performed.
39: #
40: # 1) Version numered files are cycled. That is version 6 is moved to
41: # version 7, version is moved to becomes version 6, ... and finally
42: # version 0 is moved to version 1. Both compressed names and
43: # uncompressed names are cycled, regardless of -t. Missing version
44: # files are ignored.
45: #
46: # 2) The new OLD/file.1 is compressed and is changed subject to
47: # the -m, -u and -g flags. This step is skipped if the -t flag
48: # was given.
49: #
50: # 3) The main file is moved to OLD/file.0.
51: #
52: # 4) If the -m, -u, -g or -t flags are given, then file is created
53: # (as an empty file) subject to the given flags.
54: #
55: # 5) The new OLD/file.0 is chanegd subject to the -m, -u and -g flags.
56: #
57: # Note: If the OLD sub-directory does not exist, it will be created
58: # with mode 0755.
59: #
60: # Note: If no -m, -u or -g flag is given, then the primary log file is
61: # not created.
62: #
63: # Note: Since the version numbers start with 0, version number <cycle>
64: # is never formed. The <cycle> count must be at least 2.
65: #
66: # Bugs: If a process is still writing to the file.0 and savelog
67: # moved it to file.1 and compresses it, data could be lost.
68: # Smail does not have this problem in general because it
69: # restats files often.
70:
71: # common location
72: PATH="X_UTIL_PATH_X:X_SECURE_PATH_X"; export PATH
73: COMPRESS="X_COMPRESS_X"
74: COMP_FLAG="X_COMP_FLAG_X"
75: DOT_Z="X_DOT_Z_X"
76: CHOWN="X_CHOWN_X"
77: GETOPT="X_UTIL_BIN_DIR_X/getopt"
78:
79: # parse args
80: exitcode=0 # no problems to far
81: prog=$0
82: mode=
83: user=
84: group=
85: touch=
86: count=7
87: set -- `$GETOPT m:u:g:c:lt $*`
88: if [ $# -eq 0 -o $? -ne 0 ]; then
89: echo "usage: $prog [-m mode][-u user][-g group][-t][-c cycle][-l] file ..." 1>&2
90: exit 1
91: fi
92: for i in $*; do
93: case $i in
94: -m) mode=$2; shift 2;;
95: -u) user=$2; shift 2;;
96: -g) group=$2; shift 2;;
97: -c) count=$2; shift 2;;
98: -t) touch=1; shift;;
99: -l) COMPRESS=""; shift;;
100: --) shift; break;;
101: esac
102: done
103: if [ "$count" -lt 2 ]; then
104: echo "$prog: count must be at least 2" 1>&2
105: exit 2
106: fi
107:
108: # cycle thru filenames
109: while [ $# -gt 0 ]; do
110:
111: # get the filename
112: filename=$1
113: shift
114:
115: # catch bogus files
116: if [ -b "$filename" -o -c "$filename" -o -d "$filename" ]; then
117: echo "$prog: $filename is not a regular file" 1>&2
118: exitcode=3
119: continue
120: fi
121:
122: # if not a file or empty, do nothing major
123: if [ ! -s $filename ]; then
124: # if -t was given and it does not exist, create it
125: if [ ! -z "$touch" -a ! -f $filename ]; then
126: touch $filename
127: if [ "$?" -ne 0 ]; then
128: echo "$prog: could not touch $filename" 1>&2
129: exitcode=4
130: continue
131: fi
132: if [ ! -z "$user" ]; then
133: $CHOWN $user $filename
134: fi
135: if [ ! -z "$group" ]; then
136: chgrp $group $filename
137: fi
138: if [ ! -z "$mode" ]; then
139: chmod $mode $filename
140: fi
141: fi
142: continue
143: fi
144:
145: # be sure that the savedir exists and is writable
146: savedir=`expr "$filename" : '\(.*\)/'`
147: if [ -z "$savedir" ]; then
148: savedir=./OLD
149: else
150: savedir=$savedir/OLD
151: fi
152: if [ ! -s $savedir ]; then
153: mkdir $savedir
154: if [ "$?" -ne 0 ]; then
155: echo "$prog: could not mkdir $savedir" 1>&2
156: exitcode=5
157: continue
158: fi
159: chmod 0755 $savedir
160: fi
161: if [ ! -d $savedir ]; then
162: echo "$prog: $savedir is not a directory" 1>&2
163: exitcode=6
164: continue
165: fi
166: if [ ! -w $savedir ]; then
167: echo "$prog: directory $savedir is not writable" 1>&2
168: exitcode=7
169: continue
170: fi
171:
172: # deterine our uncompressed file names
173: newname=`expr "$filename" : '.*/\(.*\)'`
174: if [ -z "$newname" ]; then
175: newname=$savedir/$filename
176: else
177: newname=$savedir/$newname
178: fi
179:
180: # cycle the old compressed log files
181: cycle=`expr $count - 1`
182: rm -f $newname.$cycle $newname.$cycle$DOT_Z
183: while [ "$cycle" -gt 1 ]; do
184: # --cycle
185: oldcycle=$cycle
186: cycle=`expr $cycle - 1`
187: # cycle log
188: if [ -f $newname.$cycle$DOT_Z ]; then
189: mv -f $newname.$cycle$DOT_Z $newname.$oldcycle$DOT_Z
190: fi
191: if [ -f $newname.$cycle ]; then
192: # file was not compressed for some reason move it anyway
193: mv -f $newname.$cycle $newname.$oldcycle
194: fi
195: done
196:
197: # compress the old uncompressed log if needed
198: if [ -f $newname.0 ]; then
199: if [ -z "$COMPRESS" ]; then
200: newfile=$newname.1
201: mv $newname.0 $newfile
202: else
203: newfile=$newname.1$DOT_Z
204: $COMPRESS $COMP_FLAG < $newname.0 > $newfile
205: rm -f $newname.0
206: fi
207: if [ ! -z "$user" ]; then
208: $CHOWN $user $newfile
209: fi
210: if [ ! -z "$group" ]; then
211: chgrp $group $newfile
212: fi
213: if [ ! -z "$mode" ]; then
214: chmod $mode $newfile
215: fi
216: fi
217:
218: # move the file into the file.0 holding place
219: mv -f $filename $newname.0
220:
221: # replace file if needed
222: if [ ! -z "$touch" -o ! -z "$user" -o \
223: ! -z "$group" -o ! -z "$mode" ]; then
224: touch $filename
225: fi
226: if [ ! -z "$user" ]; then
227: $CHOWN $user $filename
228: fi
229: if [ ! -z "$group" ]; then
230: chgrp $group $filename
231: fi
232: if [ ! -z "$mode" ]; then
233: chmod $mode $filename
234: fi
235:
236: # fix the permissions on the holding place file.0 file
237: if [ ! -z "$user" ]; then
238: $CHOWN $user $newname.0
239: fi
240: if [ ! -z "$group" ]; then
241: chgrp $group $newname.0
242: fi
243: if [ ! -z "$mode" ]; then
244: chmod $mode $newname.0
245: fi
246: done
247: exit $exitcode
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