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g13: Re-factor high level create code.

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* g13/create.c (g13_create_container): Factor some code out to ...
* g13/backend.c (be_take_lock_for_create): new.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2016-02-02 09:03:37 +01:00
parent 3087197008
commit dc1dbc43a6
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GPG key ID: E3FDFF218E45B72B
3 changed files with 64 additions and 28 deletions
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59
g13/backend.c
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@ -23,6 +23,7 @@
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include "g13.h"
#include "i18n.h"
@ -88,6 +89,64 @@ be_is_supported_conttype (int conttype)
}
/* Create a lock file for the container FNAME and store the lock at
* R_LOCK and return 0. On error return an error code and store NULL
* at R_LOCK. */
gpg_error_t
be_take_lock_for_create (ctrl_t ctrl, const char *fname, dotlock_t *r_lock)
{
gpg_error_t err;
dotlock_t lock = NULL;
struct stat sb;
*r_lock = NULL;
/* A DM-crypt container requires special treatment by using the
syshelper fucntions. */
if (ctrl->conttype == CONTTYPE_DM_CRYPT)
{
/* */
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
goto leave;
}
/* A quick check to see that no container with that name already
exists. */
if (!access (fname, F_OK))
{
err = gpg_error (GPG_ERR_EEXIST);
goto leave;
}
/* Take a lock and proceed with the creation. If there is a lock we
immediately return an error because for creation it does not make
sense to wait. */
lock = dotlock_create (fname, 0);
if (!lock)
{
err = gpg_error_from_syserror ();
goto leave;
}
if (dotlock_take (lock, 0))
{
err = gpg_error_from_syserror ();
goto leave;
}
/* Check again that the file does not exist. */
err = stat (fname, &sb)? 0 : gpg_error (GPG_ERR_EEXIST);
leave:
if (!err)
{
*r_lock = lock;
lock = NULL;
}
dotlock_destroy (lock);
return err;
}
/* If the backend requires a separate file or directory for the
container, return its name by computing it from FNAME which gives