/*******************************************************************/

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2021  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

/*******************************************************************/

#include <stdio.h>

#include <string.h>

#include <stdbool.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/stat.h>

#define ARGV_DRIVER

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_uninstall_impl.h"

#include "slibtool_readlink_impl.h"

#include "slibtool_errinfo_impl.h"

#include "argv/argv.h"

static int slbt_uninstall_usage(

	int				fdout,

	const char *			program,

	const char *			arg,

	const struct argv_option **	optv,

	struct argv_meta *		meta,

	int				noclr)

{

	char header[512];

	snprintf(header,sizeof(header),

		"Usage: %s --mode=uninstall <rm> [options] [DEST]...\n"

		"Options:\n",

		program);

	switch (noclr) {

		case 0:

			argv_usage(fdout,header,optv,arg);

			break;

		default:

			argv_usage_plain(fdout,header,optv,arg);

			break;

	}

	argv_free(meta);

	return SLBT_USAGE;

}

static int slbt_exec_uninstall_fail(

	struct slbt_exec_ctx *	actx,

	struct argv_meta *	meta,

	int			ret)

{

	argv_free(meta);

	slbt_free_exec_ctx(actx);

	return ret;

}

static int slbt_exec_uninstall_fs_entry(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx,

	char **				parg,

	char *				path,

	uint32_t			flags)

{

	struct stat	st;

	int		fdcwd;

	char *		slash;

	char		dpath[PATH_MAX];

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* needed? */

	if (fstatat(fdcwd,path,&st,0) && (errno == ENOENT))

		if (fstatat(fdcwd,path,&st,AT_SYMLINK_NOFOLLOW))

			if (errno == ENOENT)

				return 0;

	/* output */

	*parg = path;

	if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))

		if (slbt_output_uninstall(dctx,ectx))

			return SLBT_NESTED_ERROR(dctx);

	/* directory? */

	if (S_ISDIR(st.st_mode)) {

		if (!unlinkat(fdcwd,path,AT_REMOVEDIR))

			return 0;

		else if ((errno == EEXIST) || (errno == ENOTEMPTY))

			return 0;

		else

			return SLBT_SYSTEM_ERROR(dctx,path);

	}

	/* remove file or symlink entry */

	if (unlinkat(fdcwd,path,0))

		return SLBT_SYSTEM_ERROR(dctx,path);

	/* remove empty containing directory? */

	if (flags & SLBT_UNINSTALL_RMDIR) {

		strcpy(dpath,path);

		/* invalid (current) directory? */

		if (!(slash = strrchr(dpath,'/')))

			return 0;

		*slash = 0;

		if (unlinkat(fdcwd,dpath,AT_REMOVEDIR))

			return SLBT_SYSTEM_ERROR(dctx,dpath);

	}

	return 0;

}

static int slbt_exec_uninstall_versioned_library(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx,

	char **				parg,

	char *				rpath,

	char *				lpath,

	const char *			suffix,

	uint32_t			flags)

{

	char *	slash;

	char *	dot;

	char *	path;

	char	apath[PATH_MAX];

	/* normalize library link path */

	if (lpath[0] == '/') {

		path = lpath;

	} else if (!(slash = strrchr(rpath,'/'))) {

		path = lpath;

	} else {

		strcpy(apath,rpath);

		strcpy(&apath[slash-rpath+1],lpath);

		path = apath;

	}

	/* delete associated version files */

	while ((dot = strrchr(path,'.')) && (strcmp(dot,suffix))) {

		if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

			return SLBT_NESTED_ERROR(dctx);

		*dot = 0;

	}

	return 0;

}

static int slbt_exec_uninstall_entry(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx,

	struct argv_entry *		entry,

	char **				parg,

	uint32_t			flags)

{

	int		fdcwd;

	const char *	dsosuffix;

	char *		dot;

	char		path [PATH_MAX];

	char		lpath[PATH_MAX];

	if ((size_t)snprintf(path,PATH_MAX,"%s",

			entry->arg) >= PATH_MAX-8)

		return SLBT_BUFFER_ERROR(dctx);

	*parg = (char *)entry->arg;

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* remove explicit argument */

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	/* non-.la-wrapper argument? */

	if (!(dot = strrchr(path,'.')))

		return 0;

	else if (strcmp(dot,".la"))

		return 0;

	/* remove .a archive as needed */

	strcpy(dot,".a");

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	/* dsosuffix */

	dsosuffix = dctx->cctx->settings.dsosuffix;

	/* .so symlink? */

	strcpy(dot,dsosuffix);

	if (!(slbt_readlinkat(fdcwd,path,lpath,sizeof(lpath))))

		if (slbt_exec_uninstall_versioned_library(

				dctx,ectx,parg,

				path,lpath,

				dsosuffix,flags))

			return SLBT_NESTED_ERROR(dctx);

	/* .lib.a symlink? */

	strcpy(dot,".lib.a");

	if (!(slbt_readlinkat(fdcwd,path,lpath,sizeof(lpath))))

		if (slbt_exec_uninstall_versioned_library(

				dctx,ectx,parg,

				path,lpath,

				".lib.a",flags))

			return SLBT_NESTED_ERROR(dctx);

	/* .dll symlink? */

	strcpy(dot,".dll");

	if (!(slbt_readlinkat(fdcwd,path,lpath,sizeof(lpath))))

		if (slbt_exec_uninstall_versioned_library(

				dctx,ectx,parg,

				path,lpath,

				".dll",flags))

			return SLBT_NESTED_ERROR(dctx);

	/* remove .so library as needed */

	strcpy(dot,dsosuffix);

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	/* remove .lib.a import library as needed */

	strcpy(dot,".lib.a");

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	/* remove .dll library as needed */

	strcpy(dot,".dll");

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	/* remove .exe image as needed */

	strcpy(dot,".exe");

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	/* remove binary image as needed */

	*dot = 0;

	if (slbt_exec_uninstall_fs_entry(dctx,ectx,parg,path,flags))

		return SLBT_NESTED_ERROR(dctx);

	return 0;

}

int slbt_exec_uninstall(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx)

{

	int				ret;

	int				fdout;

	char **				argv;

	char **				iargv;

	uint32_t			flags;

	struct slbt_exec_ctx *		actx;

	struct argv_meta *		meta;

	struct argv_entry *		entry;

	const struct argv_option *	optv[SLBT_OPTV_ELEMENTS];

	/* dry run */

	if (dctx->cctx->drvflags & SLBT_DRIVER_DRY_RUN)

		return 0;

	/* context */

	if (ectx)

		actx = 0;

	else if ((ret = slbt_get_exec_ctx(dctx,&ectx)))

		return ret;

	else

		actx = ectx;

	/* initial state, uninstall mode skin */

	slbt_reset_arguments(ectx);

	slbt_disable_placeholders(ectx);

	iargv = ectx->cargv;

	fdout = slbt_driver_fdout(dctx);

	/* missing arguments? */

	argv_optv_init(slbt_uninstall_options,optv);

	if (!iargv[1] && (dctx->cctx->drvflags & SLBT_DRIVER_VERBOSITY_USAGE))

		return slbt_uninstall_usage(

			fdout,

			dctx->program,

			0,optv,0,

			dctx->cctx->drvflags & SLBT_DRIVER_ANNOTATE_NEVER);

	/* <uninstall> argv meta */

	if (!(meta = argv_get(

			iargv,optv,

			dctx->cctx->drvflags & SLBT_DRIVER_VERBOSITY_ERRORS

				? ARGV_VERBOSITY_ERRORS

				: ARGV_VERBOSITY_NONE,

			fdout)))

		return slbt_exec_uninstall_fail(

			actx,meta,

			SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_UNINSTALL_FAIL));

	/* dest, alternate argument vector options */

	argv  = ectx->altv;

	flags = 0;

	*argv++ = iargv[0];

	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {

		if (entry->fopt) {

			switch (entry->tag) {

				case TAG_UNINSTALL_SYSROOT:

					break;

				case TAG_UNINSTALL_HELP:

					flags |= SLBT_UNINSTALL_HELP;

					break;

				case TAG_UNINSTALL_VERSION:

					flags |= SLBT_UNINSTALL_VERSION;

					break;

				case TAG_UNINSTALL_FORCE:

					*argv++ = "-f";

					flags |= SLBT_UNINSTALL_FORCE;

					break;

				case TAG_UNINSTALL_RMDIR:

					*argv++ = "-d";

					flags |= SLBT_UNINSTALL_RMDIR;

					break;

				case TAG_UNINSTALL_VERBOSE:

					*argv++ = "-v";

					flags |= SLBT_UNINSTALL_VERBOSE;

					break;

			}

		}

	}

	/* --help */

	if (flags & SLBT_UNINSTALL_HELP) {

		slbt_uninstall_usage(

			fdout,

			dctx->program,

			0,optv,meta,

			dctx->cctx->drvflags & SLBT_DRIVER_ANNOTATE_NEVER);

		return 0;

	}

	/* uninstall */

	ectx->argv    = ectx->altv;

	ectx->program = ectx->altv[0];

	/* uninstall entries one at a time */

	for (entry=meta->entries; entry->fopt || entry->arg; entry++)

		if (!entry->fopt)

			if (slbt_exec_uninstall_entry(dctx,ectx,entry,argv,flags))

				return slbt_exec_uninstall_fail(

					actx,meta,

					SLBT_NESTED_ERROR(dctx));

	argv_free(meta);

	slbt_free_exec_ctx(actx);

	return 0;

}