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annotate sources/toys/wrappy.c @ 365:f9ec1fd54034

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Correct log message, check last $PATH element properly, and set argv[0] to path being run and not just command name.
author Rob Landley <rob@landley.net>
date Sun, 13 Jul 2008 07:57:49 -0500
parents 1782b77fae15
children 850da666acc6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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352
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1 // A little wrapper to figure out what commands you're actually using.
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2
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3 // To use it, you'll need to make a directory of symlinks and set up two
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4 // environment variables. Something like:
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5 //
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6 // export WRAPPY_LOGPATH=/path/to/wrappy.log
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7 // export WRAPPY_REALPATH="$PATH"
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8 //
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9 // WRAPPYDIR=/path/to/wrappy
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10 // cp wrappy $WRAPPYDIR
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11 // for i in `echo $PATH | sed 's/:/ /g'`
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12 // do
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13 // for j in `ls $i`
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14 // do
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15 // ln -s wrappy $WRAPPYDIR/$j
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16 // done
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17 // done
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18 //
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19 // PATH="$WRAPPYDIR" make thingy
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20
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21 #include <fcntl.h>
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22 #include <stdio.h>
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23 #include <string.h>
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24 #include <stdlib.h>
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25
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26 char blah[65536];
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27
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28 int main(int argc, char *argv[], char *env[])
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29 {
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30 char *logpath, *realpath, *p, *p2, *p3;
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31
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32 int i, fd;
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33
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34 // If these environment variables didn't propogate down to our build, how
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35 // did $PATH make it there? (Faily noisily if they are missing...)
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36
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37 logpath = getenv("WRAPPY_LOGPATH");
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38 realpath = getenv("WRAPPY_REALPATH");
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39 if (!logpath || !realpath) {
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40 fprintf(stderr, "No WRAPPY_%s\n", logpath ? "REALPATH" : "LOGPATH");
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41 exit(1);
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42 }
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43
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44 // Figure out name of command being run.
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45
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46 p2 = strrchr(*argv, '/');
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47 if (!p2) p2=*argv;
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48 else p2++;
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49
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50 // Write command line to a buffer. (We need the whole command line in one
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51 //buffer so we can do one write.)
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52
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53 p=blah + sprintf(blah, "%s ",p2);
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54 for (i=1; i<argc && (p-blah)<sizeof(blah); i++) {
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55 *(p++)='"';
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56 for (p3 = argv[i]; *p3 && (p-blah)<sizeof(blah); p3++) {
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57 char *s = "\n\\\"", *ss = strchr(s, *p3);
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58
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59 if (ss) {
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60 *(p++)='\\';
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61 *(p++)="n\\\""[ss-s];
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62 } else *(p++) = *p3;
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63 }
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64 *(p++)='"';
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65 *(p++)=' ';
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66 }
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67 p[-1]='\n';
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68
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69 // Log the command line, using O_APPEND and an atomic write so this entry
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70 // always goes at the end no matter what other processes are writing
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71 // into the file.
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72
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73 fd=open(logpath, O_WRONLY|O_CREAT|O_APPEND, 0777);
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74 write(fd, blah, p-blah);
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75 close(fd);
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76
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77 // Touch the file that got used.
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78
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79 // sprintf(blah, ROOTPATH "/used/%s", p2);
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80 // close(open(blah, O_WRONLY|O_CREAT, 0777));
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81
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82 // Hand off control to the real executable
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83
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84 for (p = p3 = realpath; ; p3++) {
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85 if (*p3==':' || !*p3) {
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86 char snapshot = *p3;
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87
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88 *p3 = 0;
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89 snprintf(blah, sizeof(blah)-1, "%s/%s", p, p2);
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90 *p3 = snapshot;
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91 argv[0]=blah;
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92 execve(blah, argv, env);
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93 if (!*p3) break;
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94 p = p3+1;
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95 }
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96 }
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97
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98 // Should never happen, means environment setup is wrong.
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99 fprintf(stderr, "Didn't find %s\n", p2);
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100 exit(1);
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101 }