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 <johannes.schindelin@xxxxxx>
---
Okay, gone is normalize_path(). In contrast, "make_absolute_path()"
does the getcwd() && chdir() && getcwd() && chdir(back) mantra, to
follow symlinks.
AFAICT, make_absolute_path() would be a Good Thing to use for the
recent lockfile stuff.
Makefile | 2 +-
cache.h | 5 ++++
path.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++
t/t0000-basic.sh | 16 +++++++++++++
test-absolute-path.c | 11 +++++++++
5 files changed, 95 insertions(+), 1 deletions(-)
create mode 100644 test-absolute-path.c
diff --git a/Makefile b/Makefile
index d8100ad..546e008 100644
--- a/Makefile
+++ b/Makefile
@@ -936,7 +936,7 @@ 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)
diff --git a/cache.h b/cache.h
index 53801b8..98af530 100644
--- a/cache.h
+++ b/cache.h
@@ -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 *);
diff --git a/path.c b/path.c
index c4ce962..0f7012f 100644
--- a/path.c
+++ b/path.c
@@ -292,3 +292,65 @@ 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, '/');
+ *last_slash = '\0';
+ last_elem = xstrdup(last_slash + 1);
+ }
+
+ if (*buf) {
+ if (!*cwd && getcwd(cwd, sizeof(cwd)) < 0)
+ die ("Could not get current working directory");
+
+ if (chdir(buf))
+ die ("Could not switch to '%s'", buf);
+ }
+ if (getcwd(buf, PATH_MAX) < 0)
+ 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;
+}
diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index 4bba9c0..4e49d59 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -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
diff --git a/test-absolute-path.c b/test-absolute-path.c
new file mode 100644
index 0000000..c959ea2
--- /dev/null
+++ b/test-absolute-path.c
@@ -0,0 +1,11 @@
+#include "cache.h"
+
+int main(int argc, char **argv)
+{
+ while (argc > 1) {
+ puts(make_absolute_path(argv[1]));
+ argc--;
+ argv++;
+ }
+ return 0;
+}
--
1.5.3.rc3.18.g49a1
-
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