Luke Granger-Brown
57725ef3ec
git-subtree-dir: third_party/nixpkgs git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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* A wrapper around execlineb, which provides all execline
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* tools on execlineb’s PATH.
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* It is implemented as a C program, because on non-Linux,
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* nested shebang lines are not supported.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <skalibs/stralloc.h>
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#include <skalibs/djbunix.h>
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#include <skalibs/strerr2.h>
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#include <skalibs/env.h>
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#include <skalibs/exec.h>
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#define dienomem() strerr_diefu1sys(111, "stralloc_catb")
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// macros from outside
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/* const char* EXECLINEB_PATH; */
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/* const char* EXECLINE_BIN_PATH; */
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int main(int argc, char const* argv[], char const *const *envp)
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{
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PROG = "execlineb-wrapper";
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char const* path = getenv("PATH");
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stralloc path_modif = STRALLOC_ZERO;
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// modify PATH if unset or EXECLINEB_BIN_PATH is not yet there
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if ( !path || ! strstr(path, EXECLINE_BIN_PATH())) {
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// prepend our execline path
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if ( ! stralloc_cats(&path_modif, "PATH=")
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|| ! stralloc_cats(&path_modif, EXECLINE_BIN_PATH()) ) dienomem();
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// old path was not empty
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if ( path && path[0] ) {
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if ( ! stralloc_catb(&path_modif, ":", 1)
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|| ! stralloc_cats(&path_modif, path) ) dienomem();
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}
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// append final \0
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if ( ! stralloc_0(&path_modif) ) dienomem();
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}
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// exec into execlineb and append path_modif to the environment
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xmexec_aem(
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EXECLINEB_PATH(),
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argv,
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envp,
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path_modif.s, path_modif.len
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);
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}
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