/*
* C4 -- CVS like front end to the Perforce p4 SCM tool.
*
* Copyright (c) 1998 - 2000, Neil Russell. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Neil Russell.
* 4. The name Neil Russell may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY NEIL RUSSELL ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NEIL RUSSELL BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Control file and client root.
*/
#include "defs.h"
/**************************************************/
/*
* Read the environment from a .c4 file.
*/
static void
read_environment(char * name)
{
int fd;
char * p1;
char * p2;
int x;
char vars[4096];
if ((fd = open(name, O_RDONLY)) == -1)
Error(1, "cannot open %s", name);
/*
* Read the file. The amount of stuff in this
* file is limited to 4KB (sizeof vars) at the
* moment. There is currently no need for more.
*/
x = read(fd, vars, sizeof vars - 1);
if (x == -1)
Error(1, "read error on %s", name);
if (x == sizeof vars - 1)
Error(0, "contents of file %s is too long (%d byte limit)",
name, sizeof vars);
vars[x] = '\0';
close(fd);
for (p1 = vars; (p2 = strchr(p1, '\n')); )
{
char * xp;
*p2 = '\0';
if ((xp = strchr(p1, '=')) && xp > p1)
{
char * s;
/*
* Environment variable.
*/
s = (char *)Alloc(strlen(p1) + 1);
strcpy(s, p1);
putenv(s);
}
else if (p1[0] == ':')
{
/*
* Ignore specification.
*/
IgnoreSpec((Ignore **)0, &p1[1]);
}
else
{
/*
* Some other sort of variable; it may get
* used at some time in the future.
*/
}
p1 = p2 + 1;
}
}
/**************************************************/
/*
* Locate the root of the client tree and read the ".c4" file. The
* contents are installed in the environment. If the ".c4" file is
* not found, c4 will still operate with standard p4 commands but c4
* specific commands will fail.
*/
void
FindRoot(void)
{
struct stat rt;
char name[1024];
int i;
/*
* Search from the current directory back for a ".c4" file,
* and if found, use its contents to set environment variables
* such as P4CLIENT and P4PORT.
*/
if (stat("/", &rt) == -1)
Error(1, "cannot stat /");
for (i = 0; ; i++)
{
struct stat st;
int l;
int x;
if (i == 0)
strcpy(name, "./");
else
{
name[0] = '\0';
for (x = 0; x < i; x++)
strcat(name, "../");
}
l = strlen(name);
/*
* Check to see if we have reached the root directory
* yet. If so, we failed.
*/
name[l] = '\0';
strcat(name, ".");
if (stat(name, &st) == -1)
Error(1, "cannot stat %s", name);
if (rt.st_ino == st.st_ino && rt.st_dev == st.st_dev)
break;
/*
* Check for a ".c4" file.
*/
name[l] = '\0';
strcat(name, C4TAG);
if (access(name, R_OK) == 0)
{
read_environment(name);
break;
}
}
/*
* Find the name of the real "p4" command (in the environment
* variable P4COMMAND).
*/
{
extern char * getenv();
char * p;
if ((p = getenv("P4COMMAND")))
CmdP4 = p;
}
}