Commit e5392c51 authored by Johannes Schindelin's avatar Johannes Schindelin Committed by Junio C Hamano

Add is_absolute_path() and make_absolute_path()

This patch adds convenience functions to work with absolute paths.
The function is_absolute_path() should help the efforts to integrate
the MinGW fork.

Note that make_absolute_path() returns a pointer to a static buffer.
Signed-off-by: Johannes Schindelin's avatarJohannes Schindelin <[email protected]>
Signed-off-by: default avatarJunio C Hamano <[email protected]>
parent 73a7a656
......@@ -944,7 +944,7 @@ endif
### Testing rules
TEST_PROGRAMS = test-chmtime$X test-genrandom$X test-date$X test-delta$X test-sha1$X test-match-trees$X
TEST_PROGRAMS = test-chmtime$X test-genrandom$X test-date$X test-delta$X test-sha1$X test-match-trees$X test-absolute-path$X
all:: $(TEST_PROGRAMS)
......
......@@ -358,6 +358,11 @@ int git_config_perm(const char *var, const char *value);
int adjust_shared_perm(const char *path);
int safe_create_leading_directories(char *path);
char *enter_repo(char *path, int strict);
static inline int is_absolute_path(const char *path)
{
return path[0] == '/';
}
const char *make_absolute_path(const char *path);
/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern int sha1_object_info(const unsigned char *, unsigned long *);
......
......@@ -288,3 +288,68 @@ int adjust_shared_perm(const char *path)
return -2;
return 0;
}
/* We allow "recursive" symbolic links. Only within reason, though. */
#define MAXDEPTH 5
const char *make_absolute_path(const char *path)
{
static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
char cwd[1024] = "";
int buf_index = 1, len;
int depth = MAXDEPTH;
char *last_elem = NULL;
struct stat st;
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
die ("Too long path: %.*s", 60, path);
while (depth--) {
if (stat(buf, &st) || !S_ISDIR(st.st_mode)) {
char *last_slash = strrchr(buf, '/');
if (last_slash) {
*last_slash = '\0';
last_elem = xstrdup(last_slash + 1);
} else
last_elem = xstrdup(buf);
}
if (*buf) {
if (!*cwd && !getcwd(cwd, sizeof(cwd)))
die ("Could not get current working directory");
if (chdir(buf))
die ("Could not switch to '%s'", buf);
}
if (!getcwd(buf, PATH_MAX))
die ("Could not get current working directory");
if (last_elem) {
int len = strlen(buf);
if (len + strlen(last_elem) + 2 > PATH_MAX)
die ("Too long path name: '%s/%s'",
buf, last_elem);
buf[len] = '/';
strcpy(buf + len + 1, last_elem);
free(last_elem);
last_elem = NULL;
}
if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
len = readlink(buf, next_buf, PATH_MAX);
if (len < 0)
die ("Invalid symlink: %s", buf);
next_buf[len] = '\0';
buf = next_buf;
buf_index = 1 - buf_index;
next_buf = bufs[buf_index];
} else
break;
}
if (*cwd && chdir(cwd))
die ("Could not change back to '%s'", cwd);
return buf;
}
......@@ -281,4 +281,20 @@ test_expect_success 'update-index D/F conflict' '
test $numpath0 = 1
'
test_expect_success 'absolute path works as expected' '
mkdir first &&
ln -s ../.git first/.git &&
mkdir second &&
ln -s ../first second/other &&
mkdir third &&
dir="$(cd .git; pwd -P)" &&
dir2=third/../second/other/.git &&
test "$dir" = "$(test-absolute-path $dir2)" &&
file="$dir"/index &&
test "$file" = "$(test-absolute-path $dir2/index)" &&
ln -s ../first/file .git/syml &&
sym="$(cd first; pwd -P)"/file &&
test "$sym" = "$(test-absolute-path $dir2/syml)"
'
test_done
#include "cache.h"
int main(int argc, char **argv)
{
while (argc > 1) {
puts(make_absolute_path(argv[1]));
argc--;
argv++;
}
return 0;
}
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