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/* ISC license. */
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <skalibs/uint64.h>
#include <skalibs/posixplz.h>
#include <skalibs/prog.h>
#include <skalibs/strerr.h>
#include <skalibs/gol.h>
#include <skalibs/djbunix.h>
#include <skalibs/unix-transactional.h>
#include <s6-rc/config.h>
#include <s6-rc/s6rc.h>
#define USAGE "s6-rc-set-copy [ -v verbosity ] [ -r repo ] [ -f ] srcset dstset"
#define dieusage() strerr_dieusage(100, USAGE)
enum golb_e
{
GOLB_FORCE = 0x01
} ;
enum gola_e
{
GOLA_VERBOSITY,
GOLA_REPODIR,
GOLA_N
} ;
static gol_bool const rgolb[] =
{
{ .so = 'f', .lo = "force", .clear = 0, .set = GOLB_FORCE }
} ;
static gol_arg const rgola[] =
{
{ .so = 'v', .lo = "verbosity", .i = GOLA_VERBOSITY },
{ .so = 'r', .lo = "repodir", .i = GOLA_REPODIR }
} ;
static uint64_t wgolb = 0 ;
static void cleanup (char const *fn)
{
int e = errno ;
rm_rf(fn) ;
errno = e ;
}
static inline void docopy (char const *repo, char const *srcname, char const *dstname)
{
size_t repolen = strlen(repo) ;
size_t srclen = strlen(srcname) ;
size_t dstlen = strlen(dstname) ;
size_t r ;
char src[repolen + srclen + 10] ;
char dst[repolen + dstlen + 10] ;
char realsrc[repolen + srclen + 18] ;
char realdst[repolen + dstlen + 18] ;
char olddst[repolen + dstlen + 18] ;
memcpy(src, repo, repolen) ;
memcpy(src + repolen, "/sources/", 9) ;
memcpy(src + repolen + 9, srcname, srclen + 1) ;
memcpy(dst, src, repolen + 9) ;
memcpy(dst + repolen + 9, dstname, dstlen + 1) ;
olddst[0] = 0 ;
if (access(dst, F_OK) == -1)
{
if (errno != ENOENT) strerr_diefu2sys(111, "access ", dst) ;
}
else if (wgolb & GOLB_FORCE)
{
memcpy(olddst, dst, repolen + 9) ;
r = readlink(dst, olddst + repolen + 9, dstlen + 9) ;
if (r == -1) strerr_diefu2sys(111, "readlink ", dst) ;
if (r != dstlen + 8) strerr_dief3x(102, "symlink ", dst, "doesn't point to a valid name") ;
}
else strerr_dief4x(1, "set ", dstname, " already exists in repository ", repo) ;
memcpy(realsrc, src, repolen + 9) ;
r = readlink(src, realsrc + repolen + 9, srclen + 9) ;
if (r == -1) strerr_diefu2sys(111, "readlink ", src) ;
if (r != srclen + 8) strerr_dief3x(102, "symlink ", src, "doesn't point to a valid name") ;
realsrc[repolen + srclen + 17] = 0 ;
memcpy(realdst, dst, repolen + 9) ;
dst[repolen + 9] = '.' ;
memcpy(realdst + repolen + 10, dstname, dstlen) ;
memcpy(realdst + repolen + 10 + dstlen, realsrc + repolen + 10 + srclen, 8) ;
if (!hiercopy(realsrc, realdst))
{
cleanup(realdst) ;
strerr_diefu4sys(111, "copy ", realsrc, " to ", realdst) ;
}
if (!atomic_symlink4(realdst + repolen + 9, dst, 0, 0))
{
cleanup(realdst) ;
strerr_diefu4sys(111, "symlink ", realdst + repolen + 9, " to ", dst) ;
}
if (olddst[0]) cleanup(olddst) ;
}
int main (int argc, char const *const *argv)
{
int fdlock ;
unsigned int verbosity = 1 ;
char const *wgola[GOLA_N] = { 0 } ;
unsigned int golc ;
PROG = "s6-rc-set-copy" ;
wgola[GOLA_REPODIR] = S6RC_REPODIR ;
golc = GOL_main(argc, argv, rgolb, rgola, &wgolb, wgola) ;
argc -= golc ; argv += golc ;
if (wgola[GOLA_VERBOSITY] && !uint0_scan(wgola[GOLA_VERBOSITY], &verbosity))
strerr_dief1x(100, "verbosity needs to be an unsigned integer") ;
if (argc < 2) dieusage() ;
for (unsigned int i = 0 ; i < 2 ; i++)
if (strchr(argv[i], '/') || strchr(argv[i], '\n'))
strerr_dief1x(100, "set names cannot contain / or newlines") ;
fdlock = s6rc_repo_lock(wgola[GOLA_REPODIR], 1) ;
if (fdlock == -1) strerr_diefu2sys(111, "lock ", wgola[GOLA_REPODIR]) ;
docopy(wgola[GOLA_REPODIR], argv[0], argv[1]) ;
_exit(0) ;
}
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