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Diffstat (limited to 'src/logic/slbt_exec_execute.c')
-rw-r--r--src/logic/slbt_exec_execute.c223
1 files changed, 161 insertions, 62 deletions
diff --git a/src/logic/slbt_exec_execute.c b/src/logic/slbt_exec_execute.c
index 971ff3c..7f9389b 100644
--- a/src/logic/slbt_exec_execute.c
+++ b/src/logic/slbt_exec_execute.c
@@ -1,6 +1,6 @@
/*******************************************************************/
-/* slibtool: a skinny libtool implementation, written in C */
-/* Copyright (C) 2016--2021 SysDeer Technologies, LLC */
+/* slibtool: a strong libtool implementation, written in C */
+/* Copyright (C) 2016--2024 SysDeer Technologies, LLC */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
@@ -13,90 +13,189 @@
#include <slibtool/slibtool.h>
#include "slibtool_spawn_impl.h"
#include "slibtool_driver_impl.h"
+#include "slibtool_snprintf_impl.h"
#include "slibtool_errinfo_impl.h"
-int slbt_exec_execute(
- const struct slbt_driver_ctx * dctx,
- struct slbt_exec_ctx * ectx)
+
+/*******************************************************************/
+/* --mode=execute: wrapper script and execution argument vector */
+/* */
+/* The purpose of executable wrapper scripts is to properly handle */
+/* one common scenario where: */
+/* */
+/* (1) a build project would entail both executable programs and */
+/* dynamically linked libraries; and */
+/* */
+/* (2) one or more of the project's executable programs would have */
+/* one or more of the project's libraries as a dynamic runtime */
+/* dependency. */
+/* */
+/* Since the project's dependency libraries are not yet installed, */
+/* correct resolution of a program's dynamic library dependencies */
+/* must depend on an appropriate setting of the LD_LIBRARY_PATH */
+/* encironment variable (on Linxu or Midipix) or an equivalent */
+/* environment variable on any of the other supported platforms. */
+/* */
+/* Here, too, there are two distinct cases: */
+/* */
+/* (a) the executable wrapper script is directly invoked from the */
+/* shell command line or otherwise; or */
+/* */
+/* (b) the build target associated with the executable program is */
+/* an argument passed to `slibtool --mode=execute` either as */
+/* the name of the program to be executed (and thus as the */
+/* first non-slibtool argument) or for processing by another */
+/* program. */
+/* */
+/* The first case is handled entirely from within the executable */
+/* wrapper script. The load environment variable is set based on */
+/* the path that was stored in it by slibtool at link time, and */
+/* the real executable is then exec'ed. */
+/* */
+/* In the second case, slibtool would start by testing whether the */
+/* first non-slibtool argument is the wrapper script of a newly */
+/* built executable program. If it is, then slibtool would invoke */
+/* the wrapper script rather than the executable program, and add */
+/* the path to the executable to the argument vector before all */
+/* other arguments, makign it ${1} from the wrapper script's point */
+/* of view. Then again, and irrespective of the previous step, */
+/* slibtool will replace any remaining command-line argument which */
+/* points to a build target associated with a newly built program */
+/* with the path to the program itself (that is, the one located */
+/* under the internal .libs/ directory). */
+/* */
+/* For the sake of consistency and robustness, wrapper scripts are */
+/* created at link time for _all_ executable programs, including */
+/* those programs which appear to have system libraries as their */
+/* sole dynamic library dependencies. */
+/*******************************************************************/
+
+
+static int slbt_argument_is_an_executable_wrapper_script(
+ const struct slbt_driver_ctx * dctx,
+ const char * arg,
+ char (*altarg)[PATH_MAX])
+{
+ int fdcwd;
+ const char * base;
+ char * mark;
+ struct stat st;
+
+ /* the extra characters: .libs/.exe.wrapper */
+ if (strlen(arg) > (PATH_MAX - 20))
+ return SLBT_BUFFER_ERROR(dctx);
+
+ /* path/to/progname --> path/to/.libs/progname.exe.wapper */
+ if ((base = strrchr(arg,'/')))
+ base++;
+
+ if (!base)
+ base = arg;
+
+ mark = *altarg;
+ mark += base - arg;
+
+ strcpy(*altarg,arg);
+ mark += sprintf(mark,".libs/%s",base);
+ strcpy(mark,".exe.wrapper");
+
+ /* not an executable wrapper script? */
+ fdcwd = slbt_driver_fdcwd(dctx);
+
+ if (fstatat(fdcwd,*altarg,&st,0) < 0)
+ return (errno == ENOENT)
+ ? 0 : SLBT_SYSTEM_ERROR(dctx,*altarg);
+
+ /* path/to/.libs/progname.exe.wapper --> path/to/.libs/progname */
+ *mark = '\0';
+
+ return 1;
+}
+
+
+int slbt_exec_execute(const struct slbt_driver_ctx * dctx)
{
int ret;
- int fdcwd;
+ char ** parg;
+ char ** aarg;
char * program;
- char * script;
- char * base;
- char * mark;
- char exeref [PATH_MAX];
+ char * exeref;
char wrapper[PATH_MAX];
- struct stat st;
- struct slbt_exec_ctx * actx = 0;
+ char exeprog[PATH_MAX];
+ char argbuf [PATH_MAX];
+ struct slbt_exec_ctx * ectx;
/* dry run */
if (dctx->cctx->drvflags & SLBT_DRIVER_DRY_RUN)
return 0;
/* context */
- if (ectx)
- slbt_disable_placeholders(ectx);
- else if ((ret = slbt_get_exec_ctx(dctx,&ectx)))
- return ret;
- else {
- actx = ectx;
- slbt_disable_placeholders(ectx);
- }
+ if (slbt_ectx_get_exec_ctx(dctx,&ectx) < 0)
+ return SLBT_NESTED_ERROR(dctx);
- /* script, program */
- program = ectx->cargv[0];
- script = ectx->cargv[1];
-
- if (script) {
- /* exeref */
- if ((base = strrchr(script,'/')))
- base++;
- else
- base = script;
-
- strcpy(exeref,script);
- mark = exeref + (base - script);
- sprintf(mark,".libs/%s",base);
-
- /* wrapper */
- if ((size_t)snprintf(wrapper,sizeof(wrapper),
- "%s.exe.wrapper",
- exeref)
- >= sizeof(wrapper)) {
- slbt_free_exec_ctx(actx);
- return SLBT_BUFFER_ERROR(dctx);
- }
+ slbt_disable_placeholders(ectx);
+
+ /* original and alternate argument vectors */
+ parg = ectx->cargv;
+ aarg = ectx->altv;
+
+ /* program (first non-slibtool argument) */
+ if (!(program = ectx->cargv[0]))
+ return SLBT_CUSTOM_ERROR(
+ dctx,
+ SLBT_ERR_FLOW_ERROR);
+
+ /* init the wrapper argument based on the first qualifying argument */
+ for (exeref=0; !exeref && *parg; parg++) {
+ strcpy(argbuf,*parg);
+
+ if ((ret = slbt_argument_is_an_executable_wrapper_script(
+ dctx,argbuf,&exeprog)) < 0) {
+ return SLBT_NESTED_ERROR(dctx);
- /* fdcwd */
- fdcwd = slbt_driver_fdcwd(dctx);
+ } else if (ret == 1) {
+ if (slbt_snprintf(
+ wrapper,sizeof(wrapper),
+ "%s.exe.wrapper",exeprog) < 0)
+ return SLBT_BUFFER_ERROR(dctx);
- /* swap vector */
- if (!fstatat(fdcwd,script,&st,0) && !fstatat(fdcwd,wrapper,&st,0)) {
- ectx->cargv[0] = wrapper;
- ectx->cargv[1] = program;
- ectx->cargv[2] = exeref;
+ exeref = *parg;
+ *aarg++ = wrapper;
} else {
- script = program;
+ strcpy(*parg,argbuf);
}
+ }
+
+ /* transform in place as needed all arguments */
+ for (parg=ectx->cargv; *parg; parg++) {
+ if ((ret = slbt_argument_is_an_executable_wrapper_script(
+ dctx,*parg,&argbuf)) < 0) {
+ return SLBT_NESTED_ERROR(dctx);
- /* execute mode */
- ectx->program = script;
- ectx->argv = ectx->cargv;
- } else {
- ectx->program = program;
- ectx->argv = ectx->cargv;
+ } else if (ret == 1) {
+ strcpy(*parg,argbuf);
+ *aarg++ = *parg;
+ } else {
+ *aarg++ = *parg;
+ }
}
+ *aarg = 0;
+
+ /* execute mode */
+ ectx->program = ectx->altv[0];
+ ectx->argv = ectx->altv;
+
/* step output */
- if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
- if (slbt_output_execute(dctx,ectx)) {
- slbt_free_exec_ctx(actx);
+ if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT)) {
+ if (slbt_output_execute(ectx)) {
+ slbt_ectx_free_exec_ctx(ectx);
return SLBT_NESTED_ERROR(dctx);
}
+ }
- execvp(ectx->cargv[0],ectx->argv);
+ execvp(ectx->altv[0],ectx->altv);
- slbt_free_exec_ctx(actx);
+ slbt_ectx_free_exec_ctx(ectx);
return SLBT_SYSTEM_ERROR(dctx,0);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 16:41:47 +0000